NSEJS 2015 22nd Nov Question Paper

NSEJS 2015 22nd Nov - Question 1

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Which of the following graphs is correct for a particle moving in a circle of radius $$r$$ at a speed of $$v$$ where $$a$$ is the magnitude of acceleration?

A

B

C

D

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NSEJS 2015 22nd Nov - Question 2

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Electronic configuration of $$\mathrm{Na^+}$$ is $$(2,8)$$ and that of sodium element is $$(2,8,1)$$. Choose the correct statements. 

i. $$\mathrm{Na^+}_{(g)}$$ is more stable than $$\mathrm{Na}_{(g)}$$. 

ii. $$\mathrm{Na^+}_{(g)}$$ is less stable than $$\mathrm{Na}_{(g)}$$. 

iii. $$\mathrm{Na^+}_{(aq)}$$ is more stable than $$\mathrm{Na}_{(aq)}$$. 

iv. $$\mathrm{Na^+}_{(aq)}$$ is less stable than $$\mathrm{Na}_{(aq)}$$.

A

ii, iii

B

i, iii

C

ii, iv

D

i, iv

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NSEJS 2015 22nd Nov - Question 3

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What will be the remainder if the number $$7^{2015}$$ is divided by $$25$$?

A

1

B

7

C

18

D

24

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NSEJS 2015 22nd Nov - Question 4

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In humans, the digestion of carbohydrates happens or takes place in the following parts of the digestive system.

A

Mouth, stomach and small intestine

B

Mouth and small intestine

C

Small intestine alone

D

Stomach and small intestine

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NSEJS 2015 22nd Nov - Question 5

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Light travels from medium X to medium Y as shown in the adjacent figure.

A

both the speed and frequency decrease

B

speed increases and frequency decreases

C

the speed decreases and wavelength decreases

D

the speed decreases and wavelength increases

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NSEJS 2015 22nd Nov - Question 6

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Hess$$'$$Law states that the heat evolved or absorbed in a chemical reaction is the same whether the process takes place in one or in several steps.

Heat evolved in the combustion of one mole $$\mathrm{C(s)}$$ in excess oxygen is $$x\,\mathrm{kJ/mol}$$, and that for the combustion of $$\mathrm{H_2(g)}$$ is $$y\,\mathrm{kJ/mol}$$ and for that of $$\mathrm{C_6H_6(l)}$$ is $$z\,\mathrm{kJ/mol}$$. Therefore, the heat change involved in the formation of one mole of $$\mathrm{C_6H_6(l)}$$ from the given equation is

A

$$x+y+z$$

B

$$6x+3y-z$$

C

$$6x+3y+z$$

D

$$x+y-\frac{z}{6}$$

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NSEJS 2015 22nd Nov - Question 7

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If $$A(p,q+r)$$, $$B(q,r+p)$$ and $$C(r,p+q)$$ are points then area of triangle $$ABC$$

A

$$p^2+q^2+r^2$$

B

$$(p+q+r)^2$$

C

$$\frac12(pq+qr+rp)$$

D

zero

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NSEJS 2015 22nd Nov - Question 8

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Photosynthesis in plants is carried out in

A

leaves

B

leaves and stems

C

leaves, stems and aerial roots

D

stems and roots

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NSEJS 2015 22nd Nov - Question 9

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A particle moves along the x-axis according to the equation $$x=6t^2$$ where $$x$$ is displacement in meters and $$t$$ is time in seconds. Therefore

A

the acceleration of the particle is $$6\,\mathrm{m\,s^{-2}}$$

B

the particle follows a parabolic path

C

each second the velocity of the particle changes by $$9.8\,\mathrm{m\,s^{-1}}$$

D

the velocity of the particle is $$6\,\mathrm{m\,s^{-1}}$$ at $$t=0.5\,\mathrm{s}$$

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NSEJS 2015 22nd Nov - Question 10

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What occurs when $$\mathrm{H_2O(l)}$$ evaporates? 

(i) Covalent bonds are broken. 

(ii) Only dipole-dipole forces are overcome. 

(iii) Heat is absorbed by water from the surroundings. 

(iv) It becomes oxygen and hydrogen gas.

A

Only (i) and (iii) occurs

B

Only (ii) and (iii) occurs

C

(i), (iii) and (iv) occurs

D

(i), (ii), (iii) and (iv) take place

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NSEJS 2015 22nd Nov - Question 11

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Evaluate $$\frac{3}{4}+\frac{3}{28}+\frac{3}{70}+\frac{3}{130}+\cdots+\frac{3}{9700}$$.

A

0.97

B

0.99

C

1

D

1.03

View Solution

NSEJS 2015 22nd Nov - Question 12

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The following technique can be used for deciphering the arrangement of nucleotides in genes.

A

karyotyping

B

nucleic acid sequencing

C

DNA finger printing

D

transcription

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NSEJS 2015 22nd Nov - Question 13

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The "reaction" force does not cancel the "action" force because

A

the action force is greater than the reaction force

B

the reaction force exists only after the action force is removed

C

the reaction force is greater than the action force

D

they act on different bodies

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NSEJS 2015 22nd Nov - Question 14

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Which of the following Lewis dot structures best describes the structure of peroxide ion of sodium peroxide?

A

B

C

D

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NSEJS 2015 22nd Nov - Question 15

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What is the sum of all three digit even numbers divisible by seventeen?

A

18846

B

18684

C

14688

D

16848

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NSEJS 2015 22nd Nov - Question 16

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When a red blood cell was placed in an animal cell in 3 different solutions, the following morphological observations were made under a microscope.

The above three solutions can be classified in the order of

A

isotonic, hypotonic and hypertonic

B

hypotonic, isotonic and hypertonic

C

hypotonic, hypertonic and isotonic

D

isotonic, hypertonic and hypotonic

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NSEJS 2015 22nd Nov - Question 17

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A stone is thrown horizontally and follows the XYZ path as shown in the adjacent figure. The direction of the acceleration of the stone at point Y is

A

$$\downarrow$$

B

$$\rightarrow$$

C

↘

D

↙

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NSEJS 2015 22nd Nov - Question 18

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Ionization Energy is defined as the energy required for removing the most loosely bound electron from an isolated gaseous atom or ion.

and so on..

Identify element A.

A

Nitrogen

B

Oxygen

C

Carbon

D

Fluorine

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NSEJS 2015 22nd Nov - Question 19

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The adjacent sides of a parallelogram are $$30\,\mathrm{cm}$$ and $$20\,\mathrm{cm}$$. The length of one diagonal is $$40\,\mathrm{cm}$$. What is the length of the other diagonal?

A

$$60\,\mathrm{cm}$$

B

$$10\sqrt{10}\,\mathrm{cm}$$

C

$$20\sqrt{5}\,\mathrm{cm}$$

D

$$8\sqrt{30}\,\mathrm{cm}$$

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NSEJS 2015 22nd Nov - Question 20

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Genetic material DNA in plants occurs in which of the following cell organelles?

A

Nucleus

B

Nucleus and chloroplast

C

Nucleus, chloroplast and mitochondria

D

Chloroplast and mitochondria

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NSEJS 2015 22nd Nov - Question 21

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The diagram shows total internal reflection. Which of the following statement is not true?

A

Angle AON is the incident angle

B

$$\angle AON=\angle BON$$

C

$$\angle AON$$ is the critical angle

D

the speed of light in medium 2 is greater than that in medium 1

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NSEJS 2015 22nd Nov - Question 22

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A chemist$$'$$s report on a batch of pharmaceutical products, Aspirin $$\mathrm{C_9H_8O_4}$$ of $$250\,\mathrm{mg}$$ and Paracetamol $$\mathrm{C_8H_9NO_2}$$ of $$500\,\mathrm{mg}$$ indicated a $$+0.5\%$$ weight error in each tablet. Due to this error, the consumer gets extra $$x$$ molecules of aspirin per tablet and extra $$y$$ molecules of paracetamol per tablet. Choose the best relation between $$x$$ and $$y$$.

A

$$x=y$$

B

x>y

C

y>x

D

$$x=2y$$

View Solution

NSEJS 2015 22nd Nov - Question 23

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The value $$41^{16}-14^{16}$$ is a multiple of

A

1485

B

1584

C

1845

D

1854

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NSEJS 2015 22nd Nov - Question 24

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The equation given below represents the process of photosynthesis.
[image]
Identify (i) and (ii).

A

B

C

D

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NSEJS 2015 22nd Nov - Question 25

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The centre of gravity of a body coincides with the center of mass

A

always

B

never

C

if the acceleration due to gravity is uniform over the body

D

if the body has a uniform distribution of mass

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NSEJS 2015 22nd Nov - Question 26

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Sodium reacts with excess oxygen to form sodium oxide. A student wants to prepare $$1.24\,\mathrm{g}$$ of sodium oxide. While doing the calculations, he uses atomic number of sodium instead of atomic mass. What is the approximate percentage error in the mass of sodium oxide obtained due to this mistake?

A

11%

B

23%

C

48%

D

60%

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NSEJS 2015 22nd Nov - Question 27

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What will be the remainder if the number $$(1000000)^3$$ is divided by $$143$$?

A

9

B

6

C

1

D

0

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NSEJS 2015 22nd Nov - Question 28

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Which of the following sequence depicts the flow of blood in human circulatory system?

A

B

C

D

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NSEJS 2015 22nd Nov - Question 29

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A body is in equilibrium under the combined action of several forces then

A

all the forces must be applied at the same point

B

all the forces form pairs of equal and opposite forces

C

the sum of the torques about any point must always be equal to zero

D

the lines of action of all the forces must pass through the centre of gravity of the body

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NSEJS 2015 22nd Nov - Question 30

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From the following pool of molecules

How many isomers are represented above

A

2

B

3

C

4

D

5

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NSEJS 2015 22nd Nov - Question 31

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How many four digit numbers divisible by twenty nine have the sum of their digits 29?

A

4

B

5

C

13

D

none of these

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NSEJS 2015 22nd Nov - Question 32

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Choose the right combination of heart types and animals.

A

B

C

D

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NSEJS 2015 22nd Nov - Question 33

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A photo frame can be hung on the wall with string in three different ways as shown in the adjacent figure below. The tension in the string is

A

least in I

B

greatest in II

C

greatest in III

D

least in III

View Solution

NSEJS 2015 22nd Nov - Question 34

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Ionic radii of following species are

A

$$ Si^{4}+ > P^{5}+ > S^{6}+ > Cl^{7}+$$

B

$$ Si^{6}+ > P^{5}+ > Si^{4}+ > Al^{3}+$$

C

$$ N^{3}- > O^{2}- > F^- > Na^{1}+$$

D

$$ Mg^{2}+ > Na^{1}+ > F^- > O^{2}- $$

View Solution

NSEJS 2015 22nd Nov - Question 35

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How many triangles are there in this figure?

A

50

B

70

C

84

D

91

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NSEJS 2015 22nd Nov - Question 36

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Raju Sharma, a 10th standard student participated in 100 meter sprint. During running he developed painful muscle contraction and fell down. The physical education teacher rushed to him and gave a hot water massage. Raju Sharma slowly recovered from the cramp. Identify the right explanation.

A

Because of the quick movement, the muscles lose their elasticity and are stressed. The inflammation developed during this process causes cramp. After hot water massage the inflammation subsides and the pain gets relieved.

B

During vigorous physical activity, aerobic respiration in the muscles increases which leads to the accumulation of more $$\mathrm{CO_2}$$ in the muscles. This causes cramps. Later $$\mathrm{CO_2}$$ was relieved upon hot water massage resulting in pain relief.

C

During vigorous physical activity, lactic acid accumulates in the muscles due to anaerobic respiration. This causes the cramps. Hot water massage improves the circulation of blood and $$\mathrm{O_2}$$ in the muscles. As a result lactic acid is converted into $$\mathrm{CO_2}$$ and water. Thus the pain gets relieved.

D

During quick movements, the nerves will not co-operate with the muscles. There is a stimulus which is taken to spinal cord and the effector function was done by motor neurons which cause cramp. On hot water massage the stimulus was subsided. Thus the pain gets relieved.

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NSEJS 2015 22nd Nov - Question 37

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If a force acting is conservative only when

A

work done by this force is zero when the particle moves once around any closed path

B

it obeys Newton$$'$$s third law

C

its work is the change in the K.E of the particle

D

it is not a frictional force

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NSEJS 2015 22nd Nov - Question 38

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Sati was studying neutralisation reaction. She accidentally dropped $$x$$ grams of a sodium carbonate monohydrate into a $$100\,\mathrm{mL}$$ solution of $$\mathrm{HCl}$$ whose concentration was $$0.25\,\mathrm{M}$$. $$10\,\mathrm{mL}$$ from this final solution was taken and titrated against $$0.05\,\mathrm{M}$$ $$\mathrm{NaOH}$$ solution to yield a titre value of $$20\,\mathrm{mL}$$. What is the value of $$x$$.

A

$$186\,\mathrm{mg}$$

B

$$93\,\mathrm{mg}$$

C

$$1860\,\mathrm{mg}$$

D

$$930\,\mathrm{mg}$$

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NSEJS 2015 22nd Nov - Question 39

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$$8888888 $$ x $$8888888$$ is a fifteen digit number divisible by $$22$$. Find the eighth digit in the number.

A

1

B

3

C

5

D

8

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NSEJS 2015 22nd Nov - Question 40

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The various parts of the human respiratory system are given below. 

(i) Nasal passage (ii) Pharynx (iii) Wind pipe 

(iv) Bronchus (v) Bronchioles (vi) Alveoli. 

Identify the right sequence of air passage during exhalation.

A

vi, v, ii, iv, iii, i

B

vi, iv, v, iii, ii, i

C

vi, v, iv, iii, ii, i

D

vi, v, ii, iii, iv, i

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NSEJS 2015 22nd Nov - Question 41

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A lift is moving up at constant speed. Consider the following statements.

I. The tension in the string is constant. 

II. The K.E of the elevator is constant.

III. The gravitational P.E of the earth lift system is constant. 

IV. The acceleration of the elevator is zero. 

V. The mechanical energy of the earth lift system is constant. 

Choose the correct option.

A

Only II and V are true

B

Only IV and V are true

C

Only I, II and III are true

D

Only I, II and IV are true

View Solution

NSEJS 2015 22nd Nov - Question 42

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Amongst the sixteen ✔ and ✗ marks, how many cases are incorrect?

✔ means displacement reaction occurs 

✗ means no displacement reaction occurs.

A

7

B

11

C

10

D

9

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NSEJS 2015 22nd Nov - Question 43

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In the adjoining figure segment AD, BE and CF are the altitudes of triangle ABC. Find $$AD\times BC$$ if $$AB\times AC=409.6$$ and $$BE\times CF=202.5$$.

A

225

B

256

C

288

D

312

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NSEJS 2015 22nd Nov - Question 44

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The testes of men lie in a small muscular pouch called scrotum located outside the abdominal cavity. Choose the correct reason.

A

Sperm formation in testes requires a higher temperature than the normal body temperature.

B

Seminal vesicles requires lower temperature to produce nutrients for sperm.

C

Sperm formation in testes requires a lower temperature than the normal body temperature.

D

Sperm produced in scrotum is easily released out without going into abdominal cavity.

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NSEJS 2015 22nd Nov - Question 45

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Two toy cars a and b fixed with spring at front collide as shown in the figure below. Car a has a mass of $$200\,\mathrm{g}$$ and is initially moving to the right. Car b has a mass of $$300\,\mathrm{g}$$ and is initially at rest. When the separation between the cars is minimum,

A

car b is at rest

B

car a has come to rest

C

both cars have the same kinetic energy

D

the K.E of the system is at a minimum

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NSEJS 2015 22nd Nov - Question 46

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What is the ratio of number of electrons gained by acidified $$\mathrm{KMnO_4}$$ and acidified $$\mathrm{K_2Cr_2O_7}$$ in the reaction given below

A

$$5\colon6$$

B

$$6\colon5$$

C

$$3\colon5$$

D

$$5\colon3$$

View Solution

NSEJS 2015 22nd Nov - Question 47

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If $$\sqrt{338}-\sqrt{288}=m$$ then $$m=$$?

A

$$\sqrt{50}$$

B

$$\sqrt{32}$$

C

$$\sqrt{18}$$

D

$$\sqrt{2}$$

View Solution

NSEJS 2015 22nd Nov - Question 48

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Which of the following is NOT produced by microbial activity?

A

Yoghurt

B

Bread

C

Vinegar

D

Antiseptics

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NSEJS 2015 22nd Nov - Question 49

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A concave spherical mirror has a focal length of $$12\,\mathrm{cm}$$. If an object is placed $$6\,\mathrm{cm}$$ in front of it, the position of the image is

A

$$4\,\mathrm{cm}$$ behind the mirror

B

$$4\,\mathrm{cm}$$ in front of the mirror

C

$$12\,\mathrm{cm}$$ behind the mirror

D

$$12\,\mathrm{cm}$$ in front of the mirror

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NSEJS 2015 22nd Nov - Question 50

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Methylcyclobutane is a saturated alkane. What is its molecular formula?

A

$$\mathrm{C_5H_{10}}$$

B

$$\mathrm{C_5H_8}$$

C

$$\mathrm{C_5H_{12}}$$

D

$$\mathrm{C_5H_6}$$

View Solution

NSEJS 2015 22nd Nov - Question 51

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$$5901AB04$$ is an eight digit number divisible by $$792$$. Find $$A+B$$.

A

6

B

7

C

8

D

9

View Solution

NSEJS 2015 22nd Nov - Question 52

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Among the following, which is not true about vaccines?

A

Vaccines contain dead microbial cells or their parts.

B

Vaccines contain antibiotics to prevent diseases.

C

Vaccine contain special proteins which evoke immune system against disease.

D

Vaccines contain inactivated micro-organisms.

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NSEJS 2015 22nd Nov - Question 53

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The current $$I$$ in the branch shown in the adjacent figure is

A

$$3.0\,\mathrm{A}$$

B

$$2.5\,\mathrm{A}$$

C

$$4.0\,\mathrm{A}$$

D

$$4.5\,\mathrm{A}$$

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NSEJS 2015 22nd Nov - Question 54

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A closed circuit shown in the adjacent figure includes a resistor of resistance $$20.0\,\Omega$$ and battery of emf $$3.0\,\mathrm{V}$$ and internal resistance of $$1\,\Omega$$. The internal resistance of the battery can be considered in series with it. The voltage drop across the resistor of resistance $$20\,\Omega$$ is

A

$$2.857\,\mathrm{V}$$

B

$$3.000\,\mathrm{V}$$

C

$$2.500\,\mathrm{V}$$

D

$$1.567\,\mathrm{V}$$

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NSEJS 2015 22nd Nov - Question 55

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A circuit which is used for charging a battery is shown in the adjacent figure. The battery B has emf $$6\,\mathrm{V}$$ and internal resistance of $$2\,\Omega$$. The charging battery A has an emf of $$9\,\mathrm{V}$$ and internal resistance of $$1\,\Omega$$. The voltage across the points P and Q

A

$$8\,\mathrm{V}$$

B

$$7\,\mathrm{V}$$

C

$$4\,\mathrm{V}$$

D

$$4.2\,\mathrm{V}$$

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NSEJS 2015 22nd Nov - Question 56

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The circuit shown in adjacent figure consists of an external resistance of $$10.0\,\Omega$$ connected across two batteries of emfs $$6.0\,\mathrm{V}$$ and $$9.0\,\mathrm{V}$$ with internal resistance of $$1.0\,\Omega$$ each. Find the power dissipated by the $$10.0\,\Omega$$ resistor.

A

$$6.5\,\mathrm{W}$$

B

$$5.1\,\mathrm{W}$$

C

$$3.5\,\mathrm{W}$$

D

$$5.5\,\mathrm{W}$$

View Solution

NSEJS 2015 22nd Nov - Question 57

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Choose the correct sets which represent the oxides as acidic, basic, neutral, amphoteric respectively. 

(i) $$\mathrm{CO_2}$$, $$\mathrm{MgO}$$, $$\mathrm{N_2O}$$, $$\mathrm{H_2O}$$ 

(ii) $$\mathrm{SO_2}$$, $$\mathrm{NO}$$, $$\mathrm{CO}$$, $$\mathrm{Al_2O_3}$$ 

(iii) $$\mathrm{P_2O_5}$$, $$\mathrm{ZnO}$$, $$\mathrm{NO}$$, $$\mathrm{Al_2O_3}$$ 

(iv) $$\mathrm{SO_3}$$, $$\mathrm{CaO}$$, $$\mathrm{N_2O}$$, $$\mathrm{PbO}$$

A

i and ii

B

ii and iii

C

iii and iv

D

iv and i

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NSEJS 2015 22nd Nov - Question 58

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What is the smallest natural number when multiplied by $$15$$ and divided by $$63$$ gives remainder $$21$$?

A

13

B

14

C

17

D

20

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NSEJS 2015 22nd Nov - Question 59

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Gram positive bacteria will have one of the specific characters. Identify it.

A

They have more peptidoglycan in their cell walls.

B

They show red colour on gram staining.

C

Flagella found all over the body.

D

They will have mesosomes as the extension of cell membrane.

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NSEJS 2015 22nd Nov - Question 60

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A silver article turns black when kept open in air for few days. The article when rubbed with toothpaste again starts shining because

A

Hydrogen peroxide present in the toothpaste reacts to give silver sulphate.

B

Hydrated silica present in the toothpaste reacts to give silver oxide.

C

Aluminium hydroxide present in the toothpaste reacts to give silver hydroxide.

D

Calcium carbonate present in the toothpaste reacts to give silver carbonate.

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NSEJS 2015 22nd Nov - Question 61

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The sum of first four terms of an A.P is 56. The sum of last four terms of same A.P is 112. The first term of the A.P is 11. Find the number of terms in that A.P.

A

7

B

8

C

11

D

13

View Solution

NSEJS 2015 22nd Nov - Question 62

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Mitochondrial equivalent in prokaryotic bacterial cell is

A

ribosomes

B

thylakoid

C

cytoplasmic plasma membrane

D

cyanosomes

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NSEJS 2015 22nd Nov - Question 63

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A compound A when treated with a dilute mineral acid gives a gas which when passed through a solution of B regenerates A. Further, a gas C that is obtained from the addition of concentrated $$\mathrm{HCl}$$ to $$\mathrm{KMnO_4}$$ crystals is used to react with B to give D. Identify A, B, C and D.

A

$$\mathrm{Na_2CO_3,NaOH,O_2,Na_2O}$$

B

$$MgCO_{3},Mg(OH)_{2},OCl_{2},Mg(OCl)_{2}$$

C

$$CaCO_{3},Ca(OH)_{2},Cl_{2},CaOCl_{2}$$

D

$$Al_2(CO_3)_3,Al(OH)_3,Cl_2,Al_2O_3$$

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NSEJS 2015 22nd Nov - Question 64

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If $$a$$ : $$b$$ =$$c$$ : $$d$$ then how many of the following statements are true? 

(i) $$c(a+b)=a(c+d)$$ 

(ii) $$d(a-b)=b(c-d)$$ 

(iii) $$(a^2+b^2)(ac-bd)=(a^2-b^2)(ac+bd)$$ 

(iv) $$\frac{a^2}{b^2}+\frac{c^2}{d^2}=\frac{2ac}{bd}$$

A

1

B

2

C

3

D

All

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NSEJS 2015 22nd Nov - Question 65

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Endemic species refers to

A

threatened wild animals and plants which belong to different areas.

B

species which are capable of inter breeding.

C

those species of flora and fauna which are found exclusively in a particular area.

D

all the plants and animals mentioned in the red data book.

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NSEJS 2015 22nd Nov - Question 66

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$$5\,\mathrm{g}$$ of a gas at $$27^\circ\mathrm{C}$$ occupied the same volume as $$0.250\,\mathrm{g}$$ of dihydrogen at $$17^\circ\mathrm{C}$$ at the same pressure. Find out molecular weight of the gas.

A

41.37

B

20.68

C

25.80

D

39.87

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NSEJS 2015 22nd Nov - Question 67

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Select any three distinct digits. Form a three digit number. Form another number by reversing the digits. Find the difference of these two numbers. What is the G.C.D of all such differences?

A

9

B

11

C

33

D

99

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NSEJS 2015 22nd Nov - Question 68

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Which of the following option is not true about the viruses?

A

Viruses have either DNA or RNA as their genetic material.

B

Viruses will not infect bacteria, fungi and algae.

C

Viruses use host machinery to produce their own proteins.

D

Viruses are useful in the preparation of vaccines.

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NSEJS 2015 22nd Nov - Question 69

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The coefficient of linear thermal expansion of steel is $$11\times10^{-6}\,{}^\circ\mathrm{C}^{-1}$$. The percentage change in the length of the rod when temperature changes by $$70^\circ\mathrm{C}$$ is

A

0.077%

B

0.085%

C

0.0576%

D

0.00077%

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NSEJS 2015 22nd Nov - Question 70

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An acid-base titration is a technique where a solution of known concentration of acid/base is used to determine the concentration of an unknown solution of acid/base. These titrations typically use a pH indicator solution to denote the end point of the reaction. A pH indicator is a compound added in small quantities toa solution to indicate the pH visually(generally by appearance/disappearanceor change in colour). A typical procedureis as follows: A certain volume ‘V1’ of unknown concentration ‘M1’ of HCl istaken in a conical flask, to which a few drops of phenolphthalein indicatorsolution is added. The solution remainscolourless. From a burette (a graduateddropper) a solution of NaOH, whoseconcentration is known, ‘M2’, is addeddropwise into the conical flask until a palepink colour is obtained and is termed as the end point. The amount of solution dispensedfrom the burette to obtain the end point is noted as ‘V2’. Phenolphthalein indicator change sits colour to pink only when the pH of the solution is above 9.5. Similarly, another indicator,methyl orange, is red in colour below pH 3.7 and yellow above. Given below is a graph of pHof the solution in the conical flask and the reading of the burette in the course of the titration. The equivalent point is theoretically defined as the point in the graph where the number of moles HCl in the conical flask becomes equal to the number of moles of NaOH run down the burette. Note the difference between end point and equivalence point.

Which is the correct graph that represents the titration of NH4OH (from burette) with HCl?

A

B

C

D

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NSEJS 2015 22nd Nov - Question 71

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There are ten numbers in a certain A.P. The sum of first three terms is 321. The sum of last three numbers is 405. Find the sum of all the ten numbers.

A

1165

B

1210

C

1221

D

1252

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NSEJS 2015 22nd Nov - Question 72

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Regeneration in animal kingdom is observed in which of the following animals?

A

Frog

B

Planaria

C

Birds

D

Snakes

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NSEJS 2015 22nd Nov - Question 73

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A cube of side $$4\,\mathrm{cm}$$ made of wood is floating in water of density $$1.00\,\mathrm{g\,cm^{-3}}$$. When a small steel ball is embedded in the cube it just immerses in water. If density of wood is $$0.76\,\mathrm{g\,cm^{-3}}$$, then mass of the steel ball is

A

$$ 12.65\,\mathrm{g} $$

B

$$ 3.84\,\mathrm{g} $$

C

$$ 15.36\,\mathrm{g} $$

D

$$ 22.98\,\mathrm{g} $$

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NSEJS 2015 22nd Nov - Question 74

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Given below is the pH versus volume curve for titration of $$\mathrm{Na_2CO_3}$$ in the conical flask with $$\mathrm{HCl}$$.

Choose the correct statement based on the above graph.

A

1st equivalence point represents $$\mathrm{NaHCO_3}$$ getting protonated to $$\mathrm{H_2CO_3}$$.

B

2nd equivalence point represents $$\mathrm{NaHCO_3}$$ getting protonated to $$\mathrm{H_2CO_3}$$.

C

1st equivalence point represents deprotonation of $$\mathrm{HCl}$$ by $$\mathrm{NaHCO_3}$$ alone.

D

2nd equivalence point represents deprotonation of $$\mathrm{HCl}$$ by $$\mathrm{Na_2CO_3}$$ alone.

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NSEJS 2015 22nd Nov - Question 75

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How many three digit numbers are divisible by $$13$$ and having middle digit 5?

A

5

B

7

C

10

D

13

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NSEJS 2015 22nd Nov - Question 76

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In biology, Polymerase Chain Reaction PCR refers to which of the following option?

A

In vitro multiplication of nucleic acids molecules.

B

In vivo multiplication of nucleic acids molecules.

C

Continuous protein synthesis from peptide.

D

Synthesis of mRNA from DNA in vitro.

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NSEJS 2015 22nd Nov - Question 77

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A swing playing with small amplitude can be considered as a simple pendulum. Such a swing is set to oscillate with an amplitude $$a$$ and frequency $$f$$. When it is at its mean position, a box of same mass as that of the seat of the swing is dropped on it and it starts moving with the swing. Choose the correct statement.

A

Amplitude is reduced to half its initial value and frequency is doubled

B

Amplitude is reduced to half its initial value and frequency is unchanged

C

Amplitude doubles and frequency is unchanged

D

Amplitude remains same and frequency is half its initial value

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NSEJS 2015 22nd Nov - Question 78

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The pH of the $$10^{-8}\,\mathrm{M}$$ $$\mathrm{HCl}$$ solution is

A

Greater than 7 and less than 8

B

Exactly 8

C

Exactly 6

D

Greater than 6 less than 7

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NSEJS 2015 22nd Nov - Question 79

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Two parallel chords $$96\,\mathrm{cm}$$ and $$28\,\mathrm{cm}$$ long are on the opposite side of the centre of the circle with radius $$50\,\mathrm{cm}$$. Find the area of the quadrilateral whose vertices are the end points of the chords.

A

3488

B

3848

C

3844

D

3484

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NSEJS 2015 22nd Nov - Question 80

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Each chromosome contains

A

one long DNA molecule

B

one long RNA molecule

C

one long sequence of amino acids

D

a single gene for a protein

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