NEET-UG 2012 Question Paper

A particle has initial velocity (2î + 3ĵ) and acceleration (0.3î + 0.2ĵ). The magnitude of velocity after 10 seconds will be:

The motion of a particle along a straight line is described by equation:
x = 8 + 12t − t³
where x is in metre and t in second. The retardation of the particle when its velocity becomes zero, is:

The horizontal range and the maximum height of a projectile are equal. The angle of projection of the projectiles is:

A car of mass 1000 kg negotiates a banked curve of radius 90 m on a frictionless road. If the banking angle is 45°, the speed of the car is:

A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 ms⁻¹. It collides with a horizontal spring of force constant 200 Nm⁻¹. The maximum compression produced in the spring will be:

Two spheres A and B of masses m₁ and m₂ respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity v/2 in a direction perpendicular to the original direction. The mass A moves after collision in the direction.

Two persons of masses 55 kg and 65 kg respectively, are at the opposite ends of a boat. The length of the boat is 3.0 m and weighs 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the centre of mass of the system shifts by

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along :

ABC is an equilateral triangle with O as its centre. 𝐅⃗₁, 𝐅⃗₂ and 𝐅⃗₃ represent three forces acting along the sides AB, BC and AC respectively. If the total torque about O is zero, the magnitude of 𝐅⃗₃ is:

A spherical planet has a mass Mₚ and diameter Dₚ. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to:

The height at which the weight of a body becomes 1/16th, its weight on the surface of earth (radius R), is:

A geostationary satellite s orbiting the earth at a height of 5R above that surface of the earth, R being the radius of the earth. The time period of another satellite in hours at a height of 2R from the surface of the earthis:

If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?
(σ stands for Stefan’s constant)

Liquid oxygen at 50K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cyclic process is :

One mole of an ideal gas goes from an initial state A to final state B via two processes : It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct P-V diagram representing the two processes is :

The damping force for an oscillator is directly proportional to the velocity. The unit of the constant of proportionality is:

If n₁, n₂ and n₃ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by :

Two sources of sound placed close to each other are emitting progressive waves given by y₁ = 4 sin 600πt and y₂ = 5 sin 608πt. An observer located near these two sources of sound will hear:

An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of the dipole to be zero when = 90°, the torque and the potential energy of the dipole will be respectively be:

What is the flux through a cube of side 'a' if a point charge q is at one of its corner:

Four point charges -Q, -q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is:

The potential energy of particle in a force field is U = A / r² - B / r, where A and B are positive constants and r is the distance of particle from the centre of the field. For stable equilibrium, the distance of the particle is:

A ring is made of a wire having a resistance R₀=12Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub-circuit between these points is equal to 8/3 Ω.

If voltage across a bulb rated 220 Volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is:

In the circuit shown the cells A and B have negligible resistances. For V_A= 12V, R₁ = 500Ω and R = 100Ω the galvanometer (G) shows no deflection. The value of V_B is:

An alternating electric field, of frequency v, is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of

the proton beam, produced by it, are given by :

An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m². The wavelength associated with the particle will be :

Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are I and 2I, respectively. The resultant magnetic field induction at the center will be :

A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be :

A compass needle which is allowed to move in a horizontal plane is taken toa geomagnetic pole. It :

A coil of resistance 400Ω is placed in a magnetic field. If the magnetic flux ϕ (wb) linked with the coil varies with time t (sec) as ϕ = 50t² + 4. The current in the coil at t = 2 sec is :

The current (I) in the inductance is varying with time according to the plot shown in figure.

Which one of the following is the correct variation of voltage with time in the coil?

In an electrical circuit R, L, C and an a.c. voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage the current in the circuit is π / 3. If instead, C is removed from the circuit, the phase difference is again π / 3. The power factor of the circuit is:

The electric field associated with an e.m. wave in vacuum is given by 𝐄⃗ = î 40 cos (kz − 6 × 10⁸t), where E, z and t are in volt / m, meter and seconds respectively. The value of wave vector k is :

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.

A concave mirror of focal length ‘f₁’ is placed at a distance of ‘d’ from a convex lens of focal length ‘f₂’. A beam of light coming from infinity and falling on this convex lens- concave mirror combination returns to infinity.
The distance ‘d’ must equal :

A ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is μ, the angle of incidence, i, is nearly equal to :

The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are :

A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is :

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the materials is :

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to first excited state. The ratio of the wavelength λ₁ : λ₂ emitted in the two cases is

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be :

(m = mass of the electron, R, Rydberg constant and h Planck's constant)

If the nuclear radius of ²⁷Al is 3.6 Fermi, the approximate nuclear radius of ⁶⁴Cu in Fermi is:

A mixture consists of two radioactive materials A₁ and A₂ with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A₁ and 160 g of A₂. The amount of the two in the mixture will become equal after :

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is :

C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator whereas Si is intrinsic semiconductor. This is because :

In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2kΩ is 2V. If the base resistance is 1kΩ and the current amplification of the transistor is 100, the input signal voltage is :

Transfer characteristics [output voltage (V₀) vs input voltage (V₁)] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used :

The figure shows a logic circuit with two inputs A and B and the output C. The voltage wave forms across A ,B and C are as given. The logic circuit gate is :

The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is

Maximum number of electrons in a subshell with : /=3 and n = 4 is:

Identify the wrong statement in the following:

Which of the following species contains three bond pairs and one lone pair around the central atom ?

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

The pair of species with the same bond order is:

Bond order of 1.5 is shown by

Standard enthalpy of vapourisation ΔᵥₐₚH° for water at 100°C is 40.66 kJ mol⁻¹. The internal energy of vapourisation of water at 100°C (in kJ mol⁻¹) is:

The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0°C is:

In which of the following reactions, standard entropy change (ΔS°) is positive and standard Gibb's energy change (ΔG°) decreases sharply with increasing temperature?

pH of a saturated solution of Ba(OH)₂ is 12. The value of solubility product (Kₛₚ) of Ba(OH)₂ is :

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value ?

Buffer solutions have constant acidity and alkalinity because

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number ?

When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from :

Which one of the alkali metals, forms only, the normal oxide, M₂O on heating in air ?

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order :

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of :

Which nomenclature is not according to IUPAC system?

Among the following compounds the one that is most reactive towards electrophilic nitration is:

Which one of the following statements regarding photochemical smog is not correct?

The number of octahedral void(s) per atom present in a cubic close-packed structure is :

A metal crystallizes with a face-centered cubic lattice. The edge length of the unit cell is 408 pm. The diameter of the metal atom is :

P_A and P_B are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If X_A represents the mole fraction of component A, the total pressure of the solution will be

Limiting molar conductivity of NH₄OH

(i.e., Λ°ₘ(NH₄OH)) is equal to :

In a reaction, A + B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reaction can be written as :

In a zero-order reaction for every 10° rise in temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become:

In Freundlich Adsorption isotherm, the value of 1/n is

The protecting power of lyophilic colloidal sol is expressed in terms of

Which one of the following is a mineral of iron?

Identify the alloy containing a non-metal as a constituent in it.

In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with :

In which of the following compounds, nitrogen exhibits highest oxidation state ?

Which of the following statements is not valid for oxoacids of phosphorus?

Sulphur trioxide can be obtained by which of the following reaction :

Which of the statements is not true?

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

Which of the following acids does not exhibit optical isomerism?

In the following sequence of reactions

Predict the product in the given reaction.

Acetone is treated with excess of ethanol in the presence of hydrochloric.acid. The product obtained is :

CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by :

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is :

Which one of the following sets of monosaccharides forms sucrose?

Which one of the following statements is incorrect about enzyme catalysis?

Deficiency of vitamin B₁ causes the disease.

Which one of the following is not a condensation polymer?

Which of the following statements is false?

50 mL of each gas A and gas B takes 150 and 200s respectively using through a pin hole under similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones as:

The cyanobacteria are also referred to as

Which statement is wrong for viruses?

Which one single organism or the pair of organisms is correctly assigned to its taxonomic group?

Which one of the following is common to multicellular fungi, filamentous algae and protonema of mosses

Cycas and Adiantum resemble each other in having:

Which one of the following is a correct statement?

In which one of the following the genus name, its two charcters and its phylum are not correctly matched, whereas the remaining three are correct

Phyllode is present in :

Placentation in tomato and lemon is

Cymose inflorescence is present in :

The gynoecium consists of many free pistils in flowers of

How many plants in the list given below have composite fruits that develop from an inflorescence: Walnut, poppy, radish, fig, pineapple, apple, tomato, mulberry

The coconut water and the edible part of coconut are equivalent to :

Vexillary aestivation is characteristic of the family

Companion cells are closely associated with:

Closed vascular bundles lack

Water containing cavities in vascular bundles are found in:

The common bottle cork is a product of:

Gymnosperms are also called soft wood spermatophytes because they lack :

Compared to those of humans, the erythrocytes in frog are

Select the correct statement from the ones given below with respect to Periplaneta americana.

Which one of the following does not differ in E.coli and Chlamydomonas?

Nuclear mebrane is absent in

Ribosomal RNA is actively synthesized in

What is true about ribosomes?

Select the correct statement from the following regarding cell membrane.

Which one is the most abundant protein in the animal world

Which one out of A-D given below correctly respresents the structural formula of the basic amino acid

Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component “X” in it.

During gamete formation, the enzyme recombinase participates during

Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

Best defined function of Manganese in green plants is :

Which one of the following is correctly matched ?

Which one of the following is wrong statement?

A process that makes important difference between C₃ and C₄ plants is :

The correct sequence of cell organelles during photorespiration is :

Anxiety and eating spicy food together in an otherwise normal human, may lead to

Which of the following are the correct statement for respiration in human?

The maximum amount of electrolytes and water (70 - 80 percent) from the glomerular filtrate is reabsorbed in which part of the nephron ?

Select the correct statement regarding the specific disorder of muscular or skeletal system:

The human hind brain comprises three parts, one of which Is :

A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system ?

Which part of the human ear plays no role in hearing as such but is otherwise very much required?

Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (Mostly in the nucleus)

What is correct to say about the hormone action in humans?

Which one of the following is correctly matched?

Both, autogamy and geitonogamy are prevented in -

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:

Even in absence of pollinating agents seed setting is as sured in

The Leydig cells found in the human body are the secretory source of

Which one of the following statements is false in respect of viability of mammalian sperm?

In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was

Signals for parturition originate from :

What is the figure given below showing in particular?

The test-tube Baby Programme employs which one of the following techniques?

A certain road accident patient with unknown blood group needs immediate blood transfusion. His care doctor friend at once offers his blood. What was the blood group of the donor?

F₂ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of:

A normal-visioned man whose father was colour blind, marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chance that this child would be colour blind?

If one strand of DNA has the nitrogenous base sequence ATCTG, what would be the complementary RNA strand sequence?

Removal of RNA polymerase III from nucleoplasm will affect the synthesis of:

Which one of the following is not a part of a transcription unit in DNA?

Removal of introns and joining of exons in a defined order during transcription is called:

Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as:

Which one of the following options gives one correct example each of convergent evolution and divergent evolution?

The extinct human who lived 1,00,000 to 40,000 years ago, in Europe, Asia and parts of Africa, With short stature, heavy eyebrows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was

Motile zygote of Plasmodium occurs in:

Widal Test is carried out to test :

Common cold differs from pneumonia in that :

In which one of the following options the two examples are correctly matched with their particular type of immunity.

Which one of the following is not a property of cancerous cells whereas the remaining three are ?

Cirrhosis of liver is caused by the chronic intake of

Which part would be most suitable for raising virus-free plants for micropropagation?

Which one of the following is a case of wrong matching ?

Monascus purpureus is a yeast used commercially in the production of :

A patient brought to a hospital with myocardial infarction is normally immediately given:

Yeast is used in the production of :

Which one of the following is an example of carrying out biological control of pests/diseases using microbes?

Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition

A nitrogen-fixing microbe associated with Azolla in rice fields is:

The figure below is the diagrammatic representation of the E. coli vector pBR 322. Which of the given options correctly identifies its certain component(s)?

A single strand of nucleic acid tagged with a radioactive molecule is called :

PCR and Restriction Fragment Length Polymorphism are the methods for :

Which one is a true statement regarding DNA polymerase used in PCR.

For transformation, micro-particles coated with DNA to be bombarded with gene gun are made up of :

Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin ‘A’ deficiency?

Pheretima and its close relatives derive nourishment from:

Identify the possible “A” in the following food chain:
Plant → insect - frog → “A” → Eagle

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?

Which one of the following is not a function of an ecosystem?

The upright pyramid of number is absent in

Which one of the following is not a gaseous biogeochemical cycle in ecosystem ?

Maximum nutritional diversity is found in the group.

The highest number of species in the world is represented by

Which one of the following areas in India, is a hotspot of biodiversity?

In an area where DDT had been used extensively, the population of birds declined significantly because:

Measuring Biochemical Oxygen Demand (BOD) is a method used for :

Which one of the following is a wrong statement?

In an area where DDT had been used extensively, the population of birds declined significantly because:

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

In the following reaction :

The major product is :