The biodegradable polymer is :
NEET 2019
For the following questions answer them individually
Solution
nylon 2-nylon 6 is the only biodegradable polymer. But none of the others are biodegradable.
For the second period elements the correct increasing order of first ionisation enthalpy is:
The major product of the following reaction is :
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]
The numberof sigma $$(\sigma)$$ and pi $$(\pi)$$ bonds in pent-2-en-4-yne is:
Which is the correct thermal stability order for $$H_2E (E = O, S, Se, Te$$ and $$Po)$$ ?
The manganate and permanganate ions are tetrahedral, due to:
The method used to remove temporary hardness of water is :
Which one is malachite from the following ?
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:
Among the following, the one that is not a green house gas is:
Identify the incorrect statement related to $$PCl_5$$, from the following:
Among the following, the reaction that proceeds through an electrophilic substitution, is :
Match the following:
Which of the following is the correct option ?
What is the correct electronic configuration of the central atom in $$K_4[Fe(CN)_6]$$ based on crystal field theory ?
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:
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 $$F = 96500 C mol^{-1}]$$
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor M is:
The correct structure of tribromooctaoxide is :
Conjugate base for Bronsted acids $$H_2O$$ and $$HF$$ are :
The compound that is most difficult to protonate is :
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 $$T = 298 K$$]
Which of the following species is not stable ?
For the chemical reaction $$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$$ the correct option is:
Which will make basic buffer ?
The most suitable reagent for the following conversion, is:
Which of the following diatomic molecular species has only $$\pi$$ bonds according to Molecular Orbital Theory ?
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 :
For an ideal solution, the correct option is:
The correct order of the basic strength of methyl substituted amines in aqueous solution is:
The structure of intermediate A in the following reaction, is:
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:
Which mixture of the solutions will lead to the formation of negatively charged colloidal $$[AgI]I^-$$ sol. ?
Match the Xenon compounds in Column - I with its structure in Column - II and assign the correct code:
Which of the following is incorrect statement ?
4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:
Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region ?
The non-essential amino acid among the following is:
Which of the following is an amphoteric hydroxide ?
Among the following, the narrow spectrum antibiotic is:
In which case change in entropy is negative ?
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:
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is
pH of a saturated solution of $$Ca(OH)_2$$ is 9. The solubility product $$(K_{sp}) of Ca(OH)_2$$ is:
The mixture that forms maximum boiling azeotrope is :
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 hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre:
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 :
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 ?
The correct Boolean operation represented by the circuit diagram drawn is:
Which of the following acts as a circuit protection device ?
In which of the following devices, the eddy current effect is not used ?
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:
The unit of thermal conductivity is:
Pick the wrong answer in the context with rainbow.
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 :
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 particle moving with velocity $$\overrightarrow{V}$$ is acted by three forces shown by the vector triangle PQR. The velocity of the particle will:
For a p-type semiconductor, which of the following statements is true ?
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 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 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 : $$(g = 10 m/s^2)$$
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 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 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:
An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly) : $$(m_e = 9 \times 10^{-31} kg)$$
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:
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 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 :
In the circuits shown below, the readings of the voltmeters and the ammeters will be:
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 mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:
In which of the following processes, heat is neither absorbed nor released by a system ?
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:
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 $$ will be:
A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3rpm. The torque required to stop after $$2 \pi$$ revolutions is:
Increase in temperature of a gas filled in a container would lead to:
In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be $$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)$$
A parallel plate capacitor of capacitance $$20 \mu F$$ is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :
The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should makeh is strokes w.r.t. north is given by:
Average velocity of a particle executing SHM in one complete vibration is :
The displacement of a particle executing simple harmonic motion is given by
$$y = A_0 + A \sin \omega t + B \cos \omega t$$
Then the amplitude of its oscillation is given by:
A small hole of area of cross-section $$2 mm^2$$ is present near the bottom of fully filled open tank of height 2m. Taking $$g = 10 m/s^2$$, the rate of flow of water through the open hole would be nearly :
Two parallel infinite line charges with linear charge densities $$+ \lambda C/m$$ and $$-\lambda C/m$$ are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges ?
Two particles A and B are moving in uniform circular motion in concentric circles of radii $$r_A and r_B$$ with speed $$v_A and v_B$$ respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be:
A 800 turn coil of effective area $$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$$ around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:
Which colour of the light has the longest wavelength ?
The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively:
$$\alpha$$- particle consists of :
A body weighs 200 N on the surface of the earth. How much will it weigh halfway downto the centre of the earth ?
Match the Column - I with Column - II:
Select the correct option.
Expressed Sequence Tags (ESTs) refers to:
Which one of the following is not a method of in situ conservation of biodiversity ?
The Earth Summit held in Rio de Janeiro in 1992 was called:
From evolutionary pointof view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in:
DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:
Match the following organisms with their respective characteristics:
Select the correct option from the following:
Which of the following statements is not correct ?
The concept of “Omnis cellula-e cellula” regarding cell division was first proposed by:
Thiobacillus is a group of bacteria helpful in carrying out :
How does steroid hormone influence the cellular activities ?
Which of the following pairs of gases is mainly responsible for green house effect ?
Which of the following is a commercial blood cholesterol lowering agent?
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.
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 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 ?
Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :
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 ?
Respiratory Quotient (RQ) value of tripalmitin is:
Match the hominids with their correct brain size:
Select the correct option.
Which of the following ecological pyramids is generally inverted ?
Which of these following methods is the most suitable for disposal of nuclear waste ?
The correct sequence of phases of cell cycle is:
Variations caused by mutation, as proposed by Hugo de Vries, are:
Match the following genes of the Lac operon with their respective products:
Select the correct option.
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$$ generation showed white, red and pink flowers. Choose the incorrect statement from the following :
The shorter and longer arms of a submetacentric chromosome are referred to as:
Which of the following factors is responsible for the formation of concentrated urine ?
Match the following hormones with the respective disease:
Select the correct option.
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:
What would be the heart rate of a person if the cardiac outputis 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
Which of the following immune responses is responsible for rejection of kidney graft ?
Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology ?
Select the incorrect statement.
What is the direction of movement of sugars in phloem ?
What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile ?
What is the site of perception of photoperiod necessary for induction of flowering in plants ?
Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement.
Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:
Cells in $$G_0$$ phase :
Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere ?
Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:
Which of the following statements is incorrect ?
Purines found both in DNA and RNA are:
Which of the statements given below is not true about formation of Annual Rings in trees ?
Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth:
What is the fate of the male gametes discharged in the synergid ?
Which of the following is true for Goldenrice ?
Select the correct sequence for transport of sperm cells in male reproductive system.
Under which of the following conditions will there be no change in the reading frame of following mRNA ?
5’ AACAGCGGUGCUAUU 3’
What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm ?
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.
Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus :
Pinus seed cannot germinate and establish without fungal association. This is because:
Match the following structures with their respective location in organs:
Select the correct option from the following:
Which of the following contraceptive methods do involve a role of hormone ?
Persistent nucellus in the seed is known as:
Select the incorrect statement.
Which of the following glucose transporters is insulin-dependent?
Select the correct option.
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?
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 ?
Select the hormone-releasing Intra-Uterine Devices.
Extrusion of second polar body from egg nucleus occurs:
Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part,is:
Which of the following statements is incorrect ?
Which of the following sexually transmitted diseases is not completely curable ?
Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:
Select the correct group of biocontrol agents.
Match the following organisms with the products they produce:
Select the correct option.
Which of the following statements regarding mitochondria is incorrect ?
Phloem in gymnosperms lacks :
Which of the following statements is correct ?
Which part of the brain is responsible for thermoregulation ?
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 ?
Which of the following is the most important cause for animals and plants being driven to extinction ?
Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes ?
Xylem translocates :
What map unit (Centimorgan) is adopted in the construction of genetic maps ?
Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.
In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as:
Which of the following can be used as a biocontrol agent in the treatment of plant disease ?
Match Column - I with Column - II.
Choose the correct answer from the options given below:
Concanavalin A is:
Drug called ‘Heroin’ is synthesized by :
The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans,these cells are mainly present in:
Which of the following muscular disorders is inherited ?
Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ?
Which of the following pair of organelles does not contain DNA ?
