NEET 2019

NEET 2019 - Question 1

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The biodegradable polymer is :

A

nylon 2-nylon 6

B

nylon-6

C

Buna-S

D

nylon-6, 6

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NEET 2019 - Question 2

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For the second period elements the correct increasing order of first ionisation enthalpy is:

A

Li < B < Be < C < O < N < F < Ne

B

Li < B < Be < C < N < O < F < Ne

C

Li < Be < B < C < O < N < F < Ne

D

Li < Be < B < C < N < O < F < Ne

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NEET 2019 - Question 3

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The major product of the following reaction is :

A

B

C

D

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NEET 2019 - Question 4

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Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is:
[Given that 1 L bar = 100 J]

A

5 kJ

B

25 J

C

30 J

D

-30 J

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NEET 2019 - Question 5

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The numberof sigma $$(\sigma)$$ and pi $$(\pi)$$ bonds in pent-2-en-4-yne is:

A

8 $$(\sigma)$$ bonds and 5 $$(\pi)$$ bonds

B

11 $$(\sigma)$$ bonds and 2 $$(\pi)$$ bonds

C

13 $$(\sigma)$$ bonds and no $$(\pi)$$ bonds

D

10 $$(\sigma)$$ bonds and 3 $$(\pi)$$ bonds

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NEET 2019 - Question 6

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Which is the correct thermal stability order for $$H_2E (E = O, S, Se, Te$$ and $$Po)$$ ?

A

$$H_2O < H_2S < H_2Se < H_2Te < H_2Po$$

B

$$H_2Po < H_2Te < H_2Se < H_2S < H_2O$$

C

$$H_2Se < H_2Te < H_2Po < H_2O < H_2S$$

D

$$H_2S < H_2O < H_2Se < H_2Te < H_2Po$$

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NEET 2019 - Question 7

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The manganate and permanganate ions are tetrahedral, due to:

A

Ther e is no $$\pi-$$ bonding

B

The $$\pi-$$ bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese

C

The $$\pi-$$ bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese

D

The $$\pi-$$ bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

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NEET 2019 - Question 8

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The method used to remove temporary hardness of water is :

A

Clark’s method

B

Ion-exchange method

C

Synthetic resins method

D

Calgon’s method

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NEET 2019 - Question 9

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Which one is malachite from the following ?

A

$$Cu(OH)_2$$

B

$$Fe_3O_4$$

C

$$CuCO_3.Cu(OH)_2$$

D

$$CuFeS_2$$

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NEET 2019 - Question 10

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A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor(Z) is:

A

Z > 1 and repulsive forces are dominant

B

Z < 1 and attractive forces are dominant

C

Z < 1 and repulsive forces are dominant

D

Z > 1 and attractive forces are dominant

View Solution

NEET 2019 - Question 11

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Among the following, the one that is not a green house gas is:

A

methane

B

ozone

C

sulphur dioxide

D

nitrous oxide

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NEET 2019 - Question 12

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Identify the incorrect statement related to $$PCl_5$$, from the following:

A

Two axial P - Cl bonds make an angle of $$180^\circ$$ with each other

B

Axial P - Cl bonds are longer than equatorial P - Cl bonds

C

$$PCl_5$$ molecule is non-reactive

D

Three equatorial P - Cl bonds make an angle of $$120^\circ$$ with each other

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NEET 2019 - Question 13

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Among the following, the reaction that proceeds through an electrophilic substitution, is :

A

B

C

D

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NEET 2019 - Question 14

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Match the following:

Which of the following is the correct option ?

A

a - ii, b - iv, c - i, d - iii

B

a - iii, b - iv, c - ii, d - i

C

a - iv, b - iii, d - ii, d - i

D

a - i, b - ii, c - iii, d - iv

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NEET 2019 - Question 15

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What is the correct electronic configuration of the central atom in $$K_4[Fe(CN)_6]$$ based on crystal field theory ?

A

$$t_{2g}^6 e_g^0$$

B

$$e^3 t_2^3$$

C

$$e^4 t_2^2$$

D

$$t_{2g}^4 e_g^2$$

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NEET 2019 - Question 16

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Which of the following reactions are disproportionation reaction ?
(a) $$2Cu^+ \rightarrow Cu^2 + Cu^0$$
(b) $$3MnO_4^{2-} + 4H^+ \rightarrow 2MnO_4^ {-} + MnO_2 + 2H_2O$$
(c) $$2KMnO_4 {_\rightarrow^\triangle} K_2MnO_4 + MnO_2 + O_2$$
(d) $$2MnO_4^ - + 3Mn^{2+} + 2H_2O \rightarrow 5MnO_2 + 4H^\oplus$$
Select the correct option from the following:

A

(a), (b) and (c)

B

(a), (c) and (d)

C

(a) and (d) only

D

(a) and (b) only

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NEET 2019 - Question 17

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For the cell reaction
$$2Fe^{3+} (aq) + 2I^-(aq) \rightarrow 2Fe^+ (aq) + I_2(aq)$$
$$E_{cell}^\ominus = 0.24 V$$ at 298 K. The standard Gibbs energy $$(\triangle_rG^\ominus)$$ of the cell reaction is:
[Given that Faraday constant $$F = 96500 C mol^{-1}]$$

A

$$-23.16 kJ mol^{-1}$$

B

$$46.32 kJ mol^{-1}$$

C

$$23.16 kJ mol^{-1}$$

D

$$-46.32 kJ mol^{-1}$$

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NEET 2019 - Question 18

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Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor M is:

A

Mg

B

Ca

C

Sr

D

Be

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NEET 2019 - Question 19

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The correct structure of tribromooctaoxide is :

A

B

C

D

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NEET 2019 - Question 20

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Conjugate base for Bronsted acids $$H_2O$$ and $$HF$$ are :

A

$$H_3O^+  and  F^-,$$ respectively

B

$$OH^-  and  F^-,$$ respectively

C

$$H_3O^+  and  H_2F^+,$$ respectively

D

$$OH^-  and  H_2F^+,$$ respectively

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NEET 2019 - Question 21

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The compound that is most difficult to protonate is :

A

B

C

D

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NEET 2019 - Question 22

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For a cell involving one electron $$E_{cell}^\ominus = 0.59 V$$ at 298 K, the equilibrium constant for the cell reaction is :
[Given that $$\frac {2.303 RT}{F} = 0.059 V$$ at $$T = 298 K$$]

A

$$1.0 \times 10^5$$

B

$$1.0 \times 10^{10}$$

C

$$1.0 \times 10^{30}$$

D

$$1.0 \times 10^2$$

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NEET 2019 - Question 23

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Which of the following species is not stable ?

A

$$[GeCl_6]^{2-}$$

B

$$[Sn(OH)_6]^{2-}$$

C

$$[SiCl_6]^{2-}$$

D

$$[SiF_6]^{2-}$$

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NEET 2019 - Question 24

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For the chemical reaction $$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$$ the correct option is:

A

$$-\frac{d[N_2]}{dt} = 2 \frac{d[NH_3]}{dt}$$

B

$$-\frac{d[N_2]}{dt} = \frac{1}{2} \frac{d[NH_3]}{dt}$$

C

$$3\frac{d[H_2]}{dt} = {2} \frac{d[NH_3]}{dt}$$

D

$$-\frac{1}{3}\frac{d[H_2]}{dt} = -\frac{1}{2} \frac{d[NH_3]}{dt}$$

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NEET 2019 - Question 25

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Which will make basic buffer ?

A

100 mL of 0.1 M $$CH_3COOH$$ + 100 mL of 0.1 M NaOH

B

100 mL of 0.1 M HCl + 200 mL of 0.1 M $$NH_4OH$$

C

100 mL of 0.1 M HCl + 100 mLof 0.1 M NaOH

D

50 mL of 0.1 M NaOH + 25 mL of 0.1 M $$CH_3COOH$$

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NEET 2019 - Question 26

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The most suitable reagent for the following conversion, is:

A

$$H_2, Pd/C, quinoline$$

B

$$Zn/HCl$$

C

$$Hg^{2+} / H^+, H_2O$$

D

$$Na / liquid NH_3$$

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NEET 2019 - Question 27

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Which of the following diatomic molecular species has only $$\pi$$ bonds according to Molecular Orbital Theory ?

A

$$N_2$$

B

$$C_2$$

C

$$Be_2$$

D

$$O_2$$

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NEET 2019 - Question 28

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An alkene “A” on reaction with $$O_3$$ and $$Zn - H_2O$$ gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is :

A

B

C

D

View Solution

NEET 2019 - Question 29

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For an ideal solution, the correct option is:

A

$$\triangle_{mix} V \neq 0$$ at constant T and P

B

$$\triangle_{mix} H = 0$$ at constant T and P

C

$$\triangle_{mix} G = 0$$ at constant T and P

D

$$\triangle_{mix} S = 0$$ at constant T and P

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NEET 2019 - Question 30

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The correct order of the basic strength of methyl substituted amines in aqueous solution is:

A

$$(CH_3)_3 N > CH_3NH_2 > (CH_3)_2NH$$

B

$$(CH_3)_3 N > (CH_3)_2 NH > CH_3NH_2$$

C

$$CH_3NH_2 > (CH_3)_2 NH > (CH_3)_3 N$$

D

$$(CH_3)_2 NH > CH_3 NH_2 > (CH_3)_3 N$$

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NEET 2019 - Question 31

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The structure of intermediate A in the following reaction, is:

A

B

C

D

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NEET 2019 - Question 32

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If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:

A

t = 6.909/k

B

t = 4.606/k

C

t = 2.303/k

D

t = 0.693/k

View Solution

NEET 2019 - Question 33

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Which mixture of the solutions will lead to the formation of negatively charged colloidal $$[AgI]I^-$$ sol. ?

A

50 mL of 1 M $$AgNO_3$$ + 50 mL of 2 M KI

B

50 mL of 2 M $$AgNO_3$$ + 50 mL of 1.5 M KI

C

50 mL of 0. 1 M $$AgNO_3$$ + 50 mL of 0.1 M KI

D

50 mL of 1 M $$AgNO_3$$ + 50 mL of 1.5 M KI

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NEET 2019 - Question 34

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Match the Xenon compounds in Column - I with its structure in Column - II and assign the correct code:

A

a - ii, b - iii, c - iv, d - i

B

a - ii, b - iii, c - i, d - iv

C

a - iii, b - iv, c - i, d - ii

D

a - i, b - ii, c - iii, d - iv

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NEET 2019 - Question 35

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Which of the following is incorrect statement ?

A

$$SiCl_4$$ is easily hydrolysed

B

$$GeX_4 (X = F, Cl, Br, I)$$ is more stable then $$GeX_2$$

C

$$SnF_4$$ is ionic in nature

D

$$PbF_4$$ is covalent in nature

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NEET 2019 - Question 36

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4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

A

6p > 5f > 5p > 4d

B

6p > 5f > 4d > 5p

C

5f > 6p > 4d > 5p

D

5f > 6p > 5p > 4d

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NEET 2019 - Question 37

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Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region ?

A

Balmer series

B

Paschen series

C

Brackett series

D

Lyman series

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NEET 2019 - Question 38

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The non-essential amino acid among the following is:

A

leucine

B

alanine

C

lysine

D

valine

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NEET 2019 - Question 39

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Which of the following is an amphoteric hydroxide ?

A

$$Ca(OH)_2$$

B

$$Mg(OH)_2$$

C

$$Be(OH)_2$$

D

$$Sr(OH)_2$$

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NEET 2019 - Question 40

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Among the following, the narrow spectrum antibiotic is:

A

ampicillin

B

amoxycillin

C

chloramphenicol

D

penicillin G

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NEET 2019 - Question 41

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In which case change in entropy is negative ?

A

Expansion of a gas at constant temperature

B

Sublimation of solid to gas

C

$$2H(g) \rightarrow H_2(g)$$

D

Evaporation of water

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NEET 2019 - Question 42

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A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:

A

$$C_3A_2$$

B

$$C_3A_4$$

C

$$C_4A_3$$

D

$$C_2A_3$$

View Solution

NEET 2019 - Question 43

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The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is

A

20

B

30

C

40

D

10

View Solution

NEET 2019 - Question 44

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pH of a saturated solution of $$Ca(OH)_2$$ is 9. The solubility product $$(K_{sp}) of Ca(OH)_2$$ is:

A

$$0.25 \times 10^{-10}$$

B

$$0.125 \times 10^{-15}$$

C

$$0.5 \times 10^{-10}$$

D

$$0.5 \times 10^{-15}$$

View Solution

NEET 2019 - Question 45

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The mixture that forms maximum boiling azeotrope is :

A

Ethanol + Water

B

Acetone + Carbon disulphide

C

Heptane + Octane

D

Water + Nitric acid

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NEET 2019 - Question 46

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The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

y - projection of the radius vector of rotating particle P is:

A

$$y (t) = 4 \sin \left(\frac{\pi t}{2}\right),$$ where y in m

B

$$y (t) = 3 \cos \left(\frac{3 \pi t}{2}\right),$$ where y in m

C

$$y (t) = 3 \cos \left(\frac{\pi t}{2}\right),$$ where y in m

D

$$y (t) = -3 \cos 2 \pi t$$ where y in m

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NEET 2019 - Question 47

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A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre:

A

zero as r increases for r < R, decreases as r increases for r > R

B

zero as r increases for r < R, increases as r increases for r > R

C

decreases as r increases for r < R and for r > R

D

increases as r increases for r < R and for r > R

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NEET 2019 - Question 48

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When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is :

A

$$MgL$$

B

$$\frac{1}{2} Mgl$$

C

$$\frac{1}{2} MgL$$

D

$$Mgl$$

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NEET 2019 - Question 49

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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

A

$$0^\circ$$

B

equal to angle of incidence

C

$$90^\circ$$

D

$$180^\circ$$

View Solution

NEET 2019 - Question 50

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The correct Boolean operation represented by the circuit diagram drawn is:

A

OR

B

NAND

C

NOR

D

AND

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NEET 2019 - Question 51

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Which of the following acts as a circuit protection device ?

A

inductor

B

switch

C

fuse

D

conductor

View Solution

NEET 2019 - Question 52

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In which of the following devices, the eddy current effect is not used ?

A

magnetic braking in train

B

electromagnet

C

electric heater

D

induction furnace

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NEET 2019 - Question 53

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Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is $$F_1$$. When the space between the two lenses is filled with glycerin (which has the same refractive index $$(\mu = 1.5)$$ as that of glass) then the equivalent focal length is $$F_2$$. The ratio $$F_1 : F_2$$ will be:

A

1 : 2

B

2 : 3

C

3 : 4

D

2 : 1

View Solution

NEET 2019 - Question 54

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The unit of thermal conductivity is:

A

$$J m^{-1} K^{-1}$$

B

$$W m K^{-1}$$

C

$$W m^{-1} K^{-1}$$

D

$$J m K^{-1}$$

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NEET 2019 - Question 55

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Pick the wrong answer in the context with rainbow.

A

The order of colours is reversed in the secondary rainbow.

B

An observer can see a rainbow when his front is towards the sun.

C

Rainbow isa combined ef fect of dispersion, refraction and reflection of sunlight

D

Wh enthe light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.

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NEET 2019 - Question 56

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Body A of mass 4m moving with speed u collides with an other body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :

A

$$\frac {8}{9}$$

B

$$\frac {4}{9}$$

C

$$\frac {5}{9}$$

D

$$\frac {1}{9}$$

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NEET 2019 - Question 57

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Ionized hydrogen atoms and $$\alpha -$$ particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths $$r_H : r_{\alpha}$$ will be:

A

1 : 2

B

4 : 1

C

1 : 4

D

2 : 1

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NEET 2019 - Question 58

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A particle moving with velocity $$\overrightarrow{V}$$ is acted by three forces shown by the vector triangle PQR. The velocity of the particle will:

A

decrease

B

remain constant

C

change according to the smallest force $$\overrightarrow{QR}$$

D

increase

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NEET 2019 - Question 59

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For a p-type semiconductor, which of the following statements is true ?

A

Holes are the majority carriers and trivalent atoms are the dopants.

B

Holes are the majority carriers and pentavalent atoms are the dopants.

C

Electrons are the majority carriers and pentavalent atoms are the dopants.

D

Electrons are the majority carriers and trivalent atoms are the dopants.

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NEET 2019 - Question 60

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A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field, B with the distance, d, from the centre of the conductor, is correctly represented by the figure :

A

B

C

D

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NEET 2019 - Question 61

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A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it ?

A

30 kJ

B

2 J

C

1 J

D

3 J

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NEET 2019 - Question 62

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A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be : $$(g = 10 m/s^2)$$

A

$$\frac{10}{2 \pi} rad/s$$

B

$$10rad/s$$

C

$$10 \pi rad/s$$

D

$$\sqrt 10 rad/s$$

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NEET 2019 - Question 63

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In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where $$X = \frac {A^2 B^{\frac{1}{2}}}{C^{\frac{1}{3}}D^3},$$ will be:

A

16%

B

-10%

C

10%

D

$$\left(\frac{3}{13}\right)%$$

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NEET 2019 - Question 64

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A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is : $$(\alpha_{Cu}) =1.7 \times 10^{-5} K^{-1} and \alpha_{Al} = 2.2 \times 10^{-5} K^{-1})$$

A

113.9 cm

B

88 cm

C

68 cm

D

6.8 cm

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NEET 2019 - Question 65

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A force F = 20 + 10y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from y = O to y = 1 m is:

A

5 J

B

25 J

C

20 J

D

30 J

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NEET 2019 - Question 66

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An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly) : $$(m_e = 9 \times 10^{-31} kg)$$

A

$$12.2 \times 10^{-12}m$$

B

$$12.2 \times 10^{-14}m$$

C

$$12.2 nm$$

D

$$12.2 \times 10^{-13}m$$

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NEET 2019 - Question 67

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The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is:

A

2 mgR

B

$$\frac{1}{2} mgR$$

C

$$\frac{3}{2} mgR$$

D

mgR

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NEET 2019 - Question 68

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At a point A on the earth’s surface the angle of dip, $$\delta = + 25^\circ$$. At a point B on the earth’s surface the angle of dip, $$\delta = - 25^\circ$$ We can interpret that:

A

A is located in the southern hemisphere and B is located in the northern hemisphere.

B

A is located in the northern hemisphere and B is located in the southern hemisphere.

C

A and are both located in the southern hemisphere.

D

A and B are both located in the northern hemisphere.

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NEET 2019 - Question 69

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A soap bubble, having radius of 1 mm,is blown from a detergent solution having a surface tension of $$2.5 \times 10^{-2}N/m.$$ The pressure inside the bubble equals at a point $$Z_0$$, below the free surface of water Taking $$g = 10 m/s^2$$, density of water $$= 10^3 kg/m^3$$, the value of $$Z_0$$ is :

A

10 cm

B

1 cm

C

0.5 cm

D

100 cm

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NEET 2019 - Question 70

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In the circuits shown below, the readings of the voltmeters and the ammeters will be:

A

$$V_1 = V_2  and  i_1 > i_2$$

B

$$V_1 = V_2  and  i_1 = i_2$$

C

$$V_1 > V_2  and  i_1 > i_2$$

D

$$V_1 > V_2  and  i_1 = i_2$$

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NEET 2019 - Question 71

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Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resist ance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

A

9 : 4

B

1 : 2

C

2 : 1

D

4 : 9

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NEET 2019 - Question 72

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A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

A

the wire is horizontal

B

the mass is at the lowest point

C

inclined at an angle of $$60^\circ$$ from vertical

D

the mass is at the highest point

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NEET 2019 - Question 73

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In which of the following processes, heat is neither absorbed nor released by a system ?

A

adiabatic

B

isobaric

C

isochoric

D

isothermal

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NEET 2019 - Question 74

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Two point charges A and B, having charges +Q and -Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes:

A

$$\frac{9F}{16}$$

B

$$\frac{16F}{9}$$

C

$$\frac{4F}{3}$$

D

F

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NEET 2019 - Question 75

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When an object is shot from the bottom of a long smooth inclined plane kept at an angle $$60^\circ$$ with horizontal, it can travel a distance $$x_1$$ along the plane. But when the inclination is decreased to $$30^\circ$$ and the same object is shot with the same velocity, it can travel $$x_2$$ distance. Then x_1 : x_2 $$ will be:

A

$$\sqrt 2 : 1$$

B

$$1 : \sqrt 3$$

C

$$1 : 2\sqrt 3$$

D

$$1 : \sqrt 2$$

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NEET 2019 - Question 76

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A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3rpm. The torque required to stop after $$2 \pi$$ revolutions is:

A

$$2 \times 10^{-3} N m$$

B

$$12 \times 10^{-4} N m$$

C

$$2 \times 10^{6} N m$$

D

$$2 \times 10^{-6} N m$$

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NEET 2019 - Question 77

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Increase in temperature of a gas filled in a container would lead to:

A

increasein its kinetic energy

B

decrease in its pressure

C

decrease in intermolecular distance

D

increase in its mass

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NEET 2019 - Question 78

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In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be $$0.2^\circ$$. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water ? $$(\mu_{water} = 4/3)$$

A

$$0.15^\circ$$

B

$$0.05^\circ$$

C

$$0.1^\circ$$

D

$$0.266^\circ$$

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NEET 2019 - Question 79

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A parallel plate capacitor of capacitance $$20 \mu F$$ is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :

A

$$60 \mu A, 60 \mu A,$$

B

$$60 \mu A, zero$$

C

$$zero, zero$$

D

$$zero, 60 \mu A,$$

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NEET 2019 - Question 80

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The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should makeh is strokes w.r.t. north is given by:

A

$$0^\circ$$

B

$$60^\circ$$ west

C

$$45^\circ$$ west

D

$$30^\circ$$ west

View Solution

NEET 2019 - Question 81

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Average velocity of a particle executing SHM in one complete vibration is :

A

$$A \omega$$

B

$$\frac{A \omega^2}{2}$$

C

$$zero$$

D

$$\frac{A \omega}{2}$$

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NEET 2019 - Question 82

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The displacement of a particle executing simple harmonic motion is given by
$$y = A_0 + A \sin \omega t + B \cos \omega t$$
Then the amplitude of its oscillation is given by:

A

$$\sqrt {A^2 + B^2} $$

B

$$\sqrt {A_0^2 + (A +B)^2}$$

C

$$A + B$$

D

$$A_0 + \sqrt {A^2 + B^2} $$

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NEET 2019 - Question 83

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A small hole of area of cross-section $$2 mm^2$$ is present near the bottom of fully filled open tank of height 2m. Taking $$g = 10 m/s^2$$, the rate of flow of water through the open hole would be nearly :

A

$$8.9 \times 10^{-6} m^3/s$$

B

$$2.23 \times 10^{-6} m^3/s$$

C

$$6.4 \times 10^{-6} m^3/s$$

D

$$12.6 \times 10^{-6} m^3/s$$

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NEET 2019 - Question 84

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Two parallel infinite line charges with linear charge densities $$+ \lambda C/m$$ and $$-\lambda C/m$$ are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges ?

A

$$\frac{2\lambda}{\pi \epsilon_0R} N/C$$

B

$$\frac{\lambda}{\pi \epsilon_0R} N/C$$

C

$$\frac{\lambda}{2 \pi \epsilon_0R} N/C$$

D

zero

View Solution

NEET 2019 - Question 85

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Two particles A and B are moving in uniform circular motion in concentric circles of radii $$r_A and r_B$$ with speed $$v_A and v_B$$ respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be:

A

$$v_A : v_B$$

B

$$r_B : r_A$$

C

$$1 : 1$$

D

$$r_A : r_B$$

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NEET 2019 - Question 86

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A 800 turn coil of effective area $$0.05 m^2$$ is kept perpendicular to a magnetic field $$5 \times 10^{-5} T$$. When the plane of the coil is rotated by $$90^\circ$$ around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

A

0.2 V

B

$$2 \times 10^{-3}V$$

C

0.02 V

D

2 V

View Solution

NEET 2019 - Question 87

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Which colour of the light has the longest wavelength ?

A

blue

B

green

C

violet

D

red

View Solution

NEET 2019 - Question 88

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The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively:

A

-3.4 eV, -6.8 eV

B

3.4 eV, -6.8 eV

C

3.4 eV, 3.4 eV

D

-3.4 eV, -3.4 eV

View Solution

NEET 2019 - Question 89

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$$\alpha$$- particle consists of :

A

2 electrons, 2 protons and 2 neutrons

B

2 electrons and 4 protons only

C

2 protons only

D

2 protons and 2 neutrons only

View Solution

NEET 2019 - Question 90

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A body weighs 200 N on the surface of the earth. How much will it weigh halfway downto the centre of the earth ?

A

200 N

B

250 N

C

100 N

D

150 N

View Solution

NEET 2019 - Question 91

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Match the Column - I with Column - II:

Select the correct option.

A

a - iv, b - i, c - ii, d - v

B

a - ii, b - i, c - v, d - iii

C

a - ii, b - iii, c - v, d - iv

D

a - iv, b - i, c - ii, d - iii

View Solution

NEET 2019 - Question 92

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Expressed Sequence Tags (ESTs) refers to:

A

Polypeptide expression

B

DNA polymorphism

C

Novel DNA sequences

D

Genes expressed as RNA

View Solution

NEET 2019 - Question 93

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Which one of the following is not a method of in situ conservation of biodiversity ?

A

Wildlife Sanctuary

B

Botanical Garden

C

Sacred Grove

D

Biosphere Reserve

View Solution

NEET 2019 - Question 94

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The Earth Summit held in Rio de Janeiro in 1992 was called:

A

for conservation of biodiversity and sustainable utilization of its benefits.

B

to assess threat posed to native species by invasive weed species.

C

for immediate steps to discontinue use of CFCs that were damaging the ozone layer.

D

to reduce $$CO_2$$ emissions and global warming

View Solution

NEET 2019 - Question 95

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From evolutionary pointof view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in:

A

Mosses

B

Pteridophytes

C

Gymnosperms

D

Laverworts

View Solution

NEET 2019 - Question 96

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DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:

A

Chilled ethanol

B

Methanol at room temperature

C

Chilled chloroform

D

Isopropanol

View Solution

NEET 2019 - Question 97

Report

Match the following organisms with their respective characteristics:

Select the correct option from the following:

A

a - iii, b - iv, c - ii, d - i

B

a - ii, b - iv, c - iii, d - i

C

a - iii, b - ii, c - iv, d - i

D

a - iii, b - ii, c - i, d - iv

View Solution

NEET 2019 - Question 98

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Which of the following statements is not correct ?

A

The hydrolytic enzymes of lysosomes are active under acidic pH.

B

Lysosomes are membrane bound structures.

C

Lysosomes are formed by the process of packaging in the endoplasmic reticulum.

D

Lysosomes have numerous hydrolytic enzymes.

View Solution

NEET 2019 - Question 99

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The concept of “Omnis cellula-e cellula” regarding cell division was first proposed by:

A

Theodore Schwann

B

Schleiden

C

Aristotle

D

RudolfVirchow

View Solution

NEET 2019 - Question 100

Report

Thiobacillus is a group of bacteria helpful in carrying out :

A

Chemoautotrophic fixation

B

Nitrification

C

Denitrification

D

Nitrogen fixation

View Solution

NEET 2019 - Question 101

Report

How does steroid hormone influence the cellular activities ?

A

Binding to DNA and forming a gene-hormone complex.

B

Activating cyclic AMP located on the cell membrane.

C

Using aquaporin channels as second messenger.

D

Changing the permeability of the cell membrane.

View Solution

NEET 2019 - Question 102

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Which of the following pairs of gases is mainly responsible for green house effect ?

A

Oxygen and Nitrogen

B

Nitrogen and Sulphur dioxide

C

Carbon dioxide and Methane

D

Ozone and Ammonia

View Solution

NEET 2019 - Question 103

Report

Which of the following is a commercial blood cholesterol lowering agent?

A

Statin

B

Streptokinase

C

Lipases

D

CyclosporinA

View Solution

NEET 2019 - Question 104

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Consider following features:
(a) Organ system level of organisation
(b) Bilateral symmetry
(c) True coelomates with segmentation of body
Select the correct option of animal groups which possess all the above characteristics.

A

Annelida, Arthropoda and Mollusea

B

Arthropoda, Mollusca and Chordata

C

Annelida, Mollusca and Chordata

D

Annelida, Arthropoda and Chordata

View Solution

NEET 2019 - Question 105

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Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impartimmunity to the newborn infants because it contains:

A

Monocytes

B

Macrophages

C

Immunoglobulin A

D

Natural killer cells

View Solution

NEET 2019 - Question 106

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A genelocus has two alleles A,a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population ?

A

0.16 (AA); 0.24 (Aa); 0.36 (aa)

B

0.16 (AA); 0.48 (Aa); 0.36 (aa)

C

0.16 (AA); 0.36 (Aa); 0.48 (aa)

D

0.36 (AA); 0.48 (Aa); 0.16 (aa)

View Solution

NEET 2019 - Question 107

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Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.

A

Streptococcus pneumoniae / Widal test

B

Salmonella typhi/ Anthrone test

C

Salmonella typhi/ Widal test

D

Plasmodium vivax / UTI test

View Solution

NEET 2019 - Question 108

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The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

A

Gregor J. Mendel

B

Alfred Sturtevant

C

Sutton Boveri

D

T.H. Morgan

View Solution

NEET 2019 - Question 109

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It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield ?

A

Gibberellin and Cytokinin

B

Gibberellin and Abscisic acid

C

Cytokinin and Abscisic acid

D

Auxin and Ethylene

View Solution

NEET 2019 - Question 110

Report

Respiratory Quotient (RQ) value of tripalmitin is:

A

0.7

B

0.07

C

0.09

D

0.9

View Solution

NEET 2019 - Question 111

Report

Match the hominids with their correct brain size:

Select the correct option.

A

a - iii, b - ii, c - i, d - iv

B

a - iii, b - iv, c - i, d - ii

C

a - iv, b - iii, c - i, d - ii

D

a - iii, b - i, c - iv, d - ii

View Solution

NEET 2019 - Question 112

Report

Which of the following ecological pyramids is generally inverted ?

A

Pyramid of energy

B

Pyramid of biomass in forest

C

Pyramid of biomass in a sea

D

Pyramid of numbers in grassland

View Solution

NEET 2019 - Question 113

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Which of these following methods is the most suitable for disposal of nuclear waste ?

A

Bury the waste under Antarctic ice-cover

B

Dumpt he waste within rocks under deep ocean

C

Bury the waste within rocks deep below the Earth’s surface

D

Shoot the waste into space

View Solution

NEET 2019 - Question 114

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The correct sequence of phases of cell cycle is:

A

$$G_1 \rightarrow G_2 \rightarrow S \rightarrow M$$

B

$$S \rightarrow G_1 \rightarrow G_2 \rightarrow M$$

C

$$G_1 \rightarrow S \rightarrow G_2 \rightarrow M$$

D

$$M \rightarrow G_1 \rightarrow G_2 \rightarrow S$$

View Solution

NEET 2019 - Question 115

Report

Variations caused by mutation, as proposed by Hugo de Vries, are:

A

random and directionless

B

small and directional

C

small and directionless

D

random and directional

View Solution

NEET 2019 - Question 116

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Match the following genes of the Lac operon with their respective products:

Select the correct option.

A

a - iii, b - i, c - ii, d - iv

B

a - iii, b - i, c - iv, d - ii

C

a - iii, b - iv, c - i, d - ii

D

a - i, b - iii, c - ii, d - iv

View Solution

NEET 2019 - Question 117

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In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in $$F_1$$ generation, pink flowers were obtained. When pink flowers were selfed, the $$F_2$$ generation showed white, red and pink flowers. Choose the incorrect statement from the following :

A

Pink colour in $$F_1$$ is due to incomplete dominance.

B

Ratio of $$F_2 is \frac{1}{4}(Red): \frac{2}{4}(Pink): \frac{1}{4}(White)$$

C

Law of Segregation does not apply in this experiment.

D

This experiment does not follow the Principle of Dominance.

View Solution

NEET 2019 - Question 118

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The shorter and longer arms of a submetacentric chromosome are referred to as:

A

p-arm and q-arm respectively

B

q-arm and p-arm respectively

C

m-arm and n-arm respectively

D

s-arm and l-arm respectively

View Solution

NEET 2019 - Question 119

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Which of the following factors is responsible for the formation of concentrated urine ?

A

Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.

B

Secretion of erythropoietin by Juxtaglomerular complex.

C

Hydrostatic pressure during glomerular filtration.

D

Low levels of antidiuretic hormone.

View Solution

NEET 2019 - Question 120

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Match the following hormones with the respective disease:

Select the correct option.

A

a - ii, b - iv, c - iii, d - i

B

a - v, b - iv, c - i, d - iii

C

a - ii, b - iv, c - i, d - iii

D

a - v, b - i, c - ii, d - iii

View Solution

NEET 2019 - Question 121

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Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

A

Flaccidity of bulliform cells

B

Shrinkage of air spaces in spongy mesophyll

C

Tyloses in vessels

D

Closure of stomata

View Solution

NEET 2019 - Question 122

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What would be the heart rate of a person if the cardiac outputis 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

A

75 beats per minute

B

100 beats per minute

C

125 beats per minute

D

50 beats per minute

View Solution

NEET 2019 - Question 123

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Which of the following immune responses is responsible for rejection of kidney graft ?

A

Humoral immune response

B

Inflammatory immune response

C

Cell-mediated immune response

D

Auto-immune response

View Solution

NEET 2019 - Question 124

Report

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology ?

A

Genetic code is redundant

B

Genetic code is nearly universal

C

Genetic code is specific

D

Genetic code is not ambiguous

View Solution

NEET 2019 - Question 125

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Select the incorrect statement.

A

Inbreeding is essential to evolve purelines in any animal.

B

Inbreeding selects harmful recessive genes that reduce fertility and productivity.

C

Inbreeding helps in accumulation of superior genes and elimination of undesirable genes.

D

Inbreeding increases homozygosity.

View Solution

NEET 2019 - Question 126

Report

What is the direction of movement of sugars in phloem ?

A

Upward

B

Downward

C

Bi-directional

D

Non-multidirectional

View Solution

NEET 2019 - Question 127

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What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile ?

A

Klinefelter’s syndrome

B

Edward syndrome

C

Down’s syndrome

D

Turner’s syndrome

View Solution

NEET 2019 - Question 128

Report

What is the site of perception of photoperiod necessary for induction of flowering in plants ?

A

Pulvinus

B

Shoot apex

C

Leaves

D

Lateral buds

View Solution

NEET 2019 - Question 129

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Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement.

A

The enzyme binds DNA at specific sites and cuts only one of the two strands.

B

The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.

C

The enzyme recognizes a specific palindromic nucleotide sequence in the DNA.

D

The enzyme cuts DNA molecule at identified position within the DNA.

View Solution

NEET 2019 - Question 130

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Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:

A

use as a fertilizer

B

construction of roads

C

making tubes and pipes

D

making plastic sacks

View Solution

NEET 2019 - Question 131

Report

Cells in $$G_0$$ phase :

A

enter the cell cycle

B

suspend the cell cycle

C

terminate the cell cycle

D

exit the cell cycle

View Solution

NEET 2019 - Question 132

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Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ?

A

Kyoto Protocol

B

Gothenburg Protocol

C

Geneva Protocol

D

Montreal Protocol

View Solution

NEET 2019 - Question 133

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Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

A

inflammation of bronchi and bronchioles.

B

proliferation of fibrous tissues and damage of the alveolar walls.

C

reduction in the secretion of surfactants by pneumocytes.

D

benign growth on mucous lining of nasal cavity.

View Solution

NEET 2019 - Question 134

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Which of the following statements is incorrect ?

A

Viruses are obligate parasites.

B

Infective constituent in viruses is the protein coat.

C

Prions consist of abnormally folded proteins.

D

Viroids lack a protein coat.

View Solution

NEET 2019 - Question 135

Report

Purines found both in DNA and RNA are:

A

Adenine and guanine

B

Guanine and cytosine

C

Cytosine and thymine

D

Adenine and thymine

View Solution

NEET 2019 - Question 136

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Which of the statements given below is not true about formation of Annual Rings in trees ?

A

Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively.

B

Activity of cambium depends upon variation in climate.

C

Annual rings are not prominent in trees of temperate region.

D

Annual ring is a combination of spring wood and autumn wood produced in a year.

View Solution

NEET 2019 - Question 137

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Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth:

A

$$Pharynx \rightarrow Oesophagus \rightarrow Gizzard \rightarrow Crop \rightarrow Ileum \rightarrow Colon \rightarrow Rectum$$

B

$$Pharynx \rightarrow Oesophagus \rightarrow Gizzard \rightarrow Ileum \rightarrow Crop \rightarrow Colon \rightarrow Rectum$$

C

$$Pharynx \rightarrow Oesophagus \rightarrow Ileum \rightarrow Crop \rightarrow Gizzard \rightarrow Colon \rightarrow Rectum$$

D

$$Pharynx \rightarrow Oesophagus \rightarrow Crop \rightarrow Gizzard \rightarrow Ileum \rightarrow Colon \rightarrow Rectum$$

View Solution

NEET 2019 - Question 138

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What is the fate of the male gametes discharged in the synergid ?

A

All fuse with the egg.

B

One fuses with the egg, other(s) fuse(s) with synergid nucleus.

C

One fuses with the egg and other fuses with central cell nuclei.

D

One fuses with the egg, other(s) degenerate(s) in the synergid.

View Solution

NEET 2019 - Question 139

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Which of the following is true for Goldenrice ?

A

It is pest resistant, with a gene from Bacillus thuringiensis.

B

It is drought tolerant, developed using Agrobacterium vector.

C

It has yellow grains, because of a gene introduced from a primitive variety of rice.

D

It is Vitamin A enriched, with a gene from daffodil.

View Solution

NEET 2019 - Question 140

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Select the correct sequence for transport of sperm cells in male reproductive system.

A

Seminiferous tubules $$\rightarrow$$ Rete testis $$\rightarrow$$ Vasa efferentia $$\rightarrow$$ Epididymis $$\rightarrow$$ Vas deferens $$\rightarrow$$ Ejaculatory duct $$\rightarrow$$ Urethra $$\rightarrow$$ Urethral meatus

B

Seminiferous tubules $$\rightarrow$$ Vasa efferentia $$\rightarrow$$ Epididymis $$\rightarrow$$ Inguinal canal $$\rightarrow$$ Urethra

C

Testis $$\rightarrow$$ Epididymis $$\rightarrow$$ Vasa efferentia $$\rightarrow$$ Vas deferens $$\rightarrow$$ Ejaculatory duct $$\rightarrow$$ Inguinal canal $$\rightarrow$$ Urethra $$\rightarrow$$ Urethral meatus

D

Testis $$\rightarrow$$ Epididymis $$\rightarrow$$ Vasa efferentia $$\rightarrow$$ Rete testis $$\rightarrow$$ Inguinal canal $$\rightarrow$$ Urethra

View Solution

NEET 2019 - Question 141

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Under which of the following conditions will there be no change in the reading frame of following mRNA ?
5’ AACAGCGGUGCUAUU 3’

A

Deletion of G from $$5^{th}$$ position

B

Insertion of A and G at $$4^{th} and 5^{th}$$ positions respectively

C

Deletion of GGU from $$7^{th}, 8^{th} and 9^{th} positions

D

Insertion of G at $$5^{th}$$ position

View Solution

NEET 2019 - Question 142

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What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm ?

A

Moist surface of midgut

B

Alkaline pH of gut

C

Acidic pH of stomach

D

Body temperature

View Solution

NEET 2019 - Question 143

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Consider the following statements:
(A) Coenzyme or metalion that is tightly bound to enzyme protein is called prosthetic group.
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.

A

(A) is true but (B) is false.

B

Both (A) and (B) are false.

C

(A) is false but (B) is true.

D

Both (A) and (B) are true.

View Solution

NEET 2019 - Question 144

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Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus :

A

Mangifera indica Linn.

B

Mangifera indica

C

Mangifera Indica

D

Mangifera indica Car. Linn.

View Solution

NEET 2019 - Question 145

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Pinus seed cannot germinate and establish without fungal association. This is because:

A

it has obligate association with mycorrhizae.

B

it has very hard seed coat.

C

its seeds contain inhibitors that prevent germination.

D

its embryo is immature.

View Solution

NEET 2019 - Question 146

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Match the following structures with their respective location in organs:

Select the correct option from the following:

A

a - ii, b - iv, c - i, d - iii

B

a - iii, b - iv, c - i, d - ii

C

a - iii, b - ii, c - i, d - iv

D

a - iii, b - i, c - ii, d - iv

View Solution

NEET 2019 - Question 147

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Which of the following contraceptive methods do involve a role of hormone ?

A

Barrier method, Lactational amenorrhea, Pills

B

CuT, Pills, Emergency contraceptives

C

Pills, Emergency contraceptives, Barrier methods

D

Lactational amenorrhea, Pills, Emergency contraceptives

View Solution

NEET 2019 - Question 148

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Persistent nucellus in the seed is known as:

A

Perisperm

B

Hilum

C

Tegmen

D

Chalaza

View Solution

NEET 2019 - Question 149

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Select the incorrect statement.

A

In male grasshoppers, 50% of sperms have no sex-chromosome.

B

In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.

C

Human males have one of their sex-chromosome much shorter than the other

D

Male fruit fly is heterogametic.

View Solution

NEET 2019 - Question 150

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Which of the following glucose transporters is insulin-dependent?

A

GLUT II

B

GLUT III

C

GLUT IV

D

GLUT I

View Solution

NEET 2019 - Question 151

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Select the correct option.

A

$$11^{th} and 12^{th}$$ pairs of ribs are connected to the sternum with the help of hyaline cartilage.

B

Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.

C

There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

D

$$8^{th}, 9^{th} and 10^{th}$$ pairs of ribs articulate directly with the sternum.

View Solution

NEET 2019 - Question 152

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Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

A

1700 mL

B

2200 mL

C

2700 mL

D

1500 mL

View Solution

NEET 2019 - Question 153

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Use of an artificial kidney during hemodialysis may result in :
a) Nitrogenous waste build-up in the body
b) Non-elimination of excess potassium ions
c) Reduced absorption of calcium ions from gastro-intestinal tract
d) Reduced RBC production
Which of the following options is the most appropriate ?

A

(b) and (c) are correct

B

(c) and (d) are correct

C

(a) and (d) are correct

D

(a) and (b) are correct

View Solution

NEET 2019 - Question 154

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Select the hormone-releasing Intra-Uterine Devices.

A

Multiload 375, Progestasert

B

Progestasert, LNG-20

C

Lippes Loop, Multiload 375

D

Vaults, LNG-20

View Solution

NEET 2019 - Question 155

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Extrusion of second polar body from egg nucleus occurs:

A

after fertilization

B

before entry of sperm into ovum

C

simultaneously with first cleavage

D

after entry of sperm but before fertilization

View Solution

NEET 2019 - Question 156

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Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part,is:

A

Axile

B

Parietal

C

Free central

D

Basal

View Solution

NEET 2019 - Question 157

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Which of the following statements is incorrect ?

A

Claviceps is a source of many alkaloids and LSD.

B

Conidia are produced exogenously and ascospores endogenously.

C

Yeasts have filamentous bodies with long thread-like hyphae.

D

Morels and truffles are edible delicacies.

View Solution

NEET 2019 - Question 158

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Which of the following sexually transmitted diseases is not completely curable ?

A

Genital warts

B

Genital herpes

C

Chlamydiasis

D

Gonorrhoea

View Solution

NEET 2019 - Question 159

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Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:

A

Hexokinase

B

Enolase

C

Phosphofructokinase

D

Aldolase

View Solution

NEET 2019 - Question 160

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Select the correct group of biocontrol agents.

A

Trichoderma, Baculovirus, Bacillus thuringiensis

B

Oscillatoria, Rhizobium, Trichoderma

C

Nostoc, Azospirillium, Nucleopolyhedrovirus

D

Bacillus thuringiensis, Tobacco mosaic virus, Aphids

View Solution

NEET 2019 - Question 161

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Match the following organisms with the products they produce:

Select the correct option.

A

a - ii, b - iv, c - iii, d - v

B

a - iii, b - iv, c - v, d - i

C

a - ii, b - i, c - iii, d - v

D

a - ii, b - iv, c - v, d - iii

View Solution

NEET 2019 - Question 162

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Which of the following statements regarding mitochondria is incorrect ?

A

Enzymes of electron transport are embedded in outer membrane.

B

Inner membrane is convoluted with infoldings.

C

Mitochondrial matrix contains single circular DNA molecule and ribosomes.

D

Outer membrane is permeable to monomers of carbohydrates, fats and proteins.

View Solution

NEET 2019 - Question 163

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Phloem in gymnosperms lacks :

A

Sieve tubes only

B

Companion cells only

C

Both sieve tubes and companion cells

D

Albuminous cells and sieve cells

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NEET 2019 - Question 164

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Which of the following statements is correct ?

A

Cornea consists of dense connective tissue of elastin and can repair itself.

B

Cornea is convex, transparent layer which is highly vascularised.

C

Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.

D

Cornea is an external, transparent and protective proteinacious covering of the eye-ball.

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NEET 2019 - Question 165

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Which part of the brain is responsible for thermoregulation ?

A

Hypothalamus

B

Corpus callosum

C

Medulla oblongata

D

Cerebrum

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NEET 2019 - Question 166

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In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place ?

A

Stabilizing Selection

B

Disruptive Selection

C

Cyclical Selection

D

Directional Selection

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NEET 2019 - Question 167

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Which of the following is the most important cause for animals and plants being driven to extinction ?

A

Drought and floods

B

Economic exploitation

C

Alien species invasion

D

Habitat loss and fragmentation

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NEET 2019 - Question 168

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Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes ?

A

Sludge digester

B

Industrial oven

C

Bioreactor

D

BOD incubator

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NEET 2019 - Question 169

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Xylem translocates :

A

Water and mineral salts only

B

Water, mineral salts and some organic nitrogen only

C

Water, mineral salts, some organic nitrogen and hormones

D

Water only

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NEET 2019 - Question 170

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What map unit (Centimorgan) is adopted in the construction of genetic maps ?

A

A unit of distance between two expressed genes, representing 100% cross over.

B

A unit of distance between genes on chromosomes, representing 1% cross over.

C

A unit of distance between genes on chromosomes, representing 50% cross over.

D

A unit of distance between two expressed genes, representing 10% cross over.

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NEET 2019 - Question 171

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Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.

A

Goblet Cells

B

Oxyntic Cells

C

Duodenal Cells

D

Chief Cells

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NEET 2019 - Question 172

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In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as:

A

Parthenocarpy

B

Syngamy

C

Parthenogenesis

D

Autogamy

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NEET 2019 - Question 173

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Which of the following can be used as a biocontrol agent in the treatment of plant disease ?

A

Chlorella

B

Anabaena

C

Lactobacillus

D

Trichoderma

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NEET 2019 - Question 174

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Match Column - I with Column - II.

Choose the correct answer from the options given below:

A

a - iii, b - ii, c - i, d - iv

B

a - ii, b - i, c - iii, d - iv

C

a - ii, b - iii, c - iv, d - i

D

a - i, b - ii, c - iii, d - iv

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NEET 2019 - Question 175

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Concanavalin A is:

A

an essential oil

B

a lectin

C

a pigment

D

an alkaloid

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NEET 2019 - Question 176

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Drug called ‘Heroin’ is synthesized by :

A

acetylation of morphine

B

glycosylation of morphine

C

nitration of morphine

D

methylation of morphine

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NEET 2019 - Question 177

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The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans,these cells are mainly present in:

A

Fallopian tubes and Pancreatic duct

B

Eustachian tube and Salivary duct

C

Bronchioles and Fallopian tubes

D

Bile duct and Bronchioles

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NEET 2019 - Question 178

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Which of the following muscular disorders is inherited ?

A

Muscular dystrophy

B

Myasthenia gravis

C

Botulism

D

Tetany

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NEET 2019 - Question 179

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Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ?

A

Zygote develops into embryo

B

Central cell develops into endosperm

C

Ovules develop into embryo sac

D

Ovary develops into fruit

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NEET 2019 - Question 180

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Which of the following pair of organelles does not contain DNA ?

A

Chloroplast and Vacuoles

B

Lysosomes and Vacuoles

C

Nuclear envelope and Mitochondria

D

Mitochondria and Lysosomes

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