NEET-UG 2015 Question Paper

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:

The cutting of DNA at specific locations became possible with the discovery of

Choose the correct option for the following events of meiosis in correct sequence:

(A) Crossing over

(B) Synapsis

(C) Terminalisation of chiasmata

(D) Disappearance of nucleolus

Chromatophores take part in:

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

Flowers are unisexual in:

Read the different components from (A) to (D) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.

(A) Secondary cortex (B) Wood

(C) Secondary phloem (D) Phellem The correct order is:

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. ‘What is the probability of their grandson being colour blind?

In which of the following both pairs have correct combination?

A childless couple can be assisted to have a child through a technique called GIFT. The full form of this technique is:

Destruction of the anterior horn cell of the spinal cord would result in loss of:

Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

Cellular organelles with membranes are:

Match the columns and identify the correct option.

Satellite DNA is important because it:

A mixture of gases contains H₂ and O₂ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

Which of the following pairs of ions are isoelectronic and isostructural?

Maximum bond angle at nitrogen is present in which of the following?

The correct bond order in the following species is:

Which of the following options represents the correct bond order?

Which of the following species contains equal number of σ- and π-bonds?

If the value of an equilibrium constant for a particular reaction is 1.6 × 10¹², then at equilibrium the system will contain:

Which of the following statements is correct for a reversible process in a state of equilibrium?

The Kₛₚ​ of Ag₂CrO₄, AgCl, AgBr and AgI are respectively,

1.1 × 10⁻¹², 1.8 × 10⁻¹⁰, 5.0 × 10⁻¹³, 8.3 × 10⁻¹⁷

Which of the following salts will precipitate first on adding AgNO₃ solution to a solution containing equal moles of NaCl, NaBr, NaI and Na₂CrO₄?

The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

Solubility of the alkaline earth's metal sulphates in water decreases in the sequence:

Given

Which of the given compounds can exhibit tautomerism?

Consider the following compounds

Hyperconjugation occurs in :

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is:

A single compound of the structure :

is obtainable from ozonolysis of which of the following cyclic compounds ?

The total number of π - bond electrons in the following structure is :

Which one is not equal to zero for an ideal solution?

The oxidation of benzene by V₂O₅ in presence of air produces:

Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of Al₂(SO₄)₃ (if all are 100% ionised)?

The boiling point of 0.2 mol kg⁻¹ solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as:

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

The activation energy of a reaction can be determined from the slope of which of the following graphs?

Which property of colloidal solution is independent of charge on the colloidal particles?

Metals are usually not found as nitrates in their ores”. Out of the following two (i) and (ii) reasons which is/are true for the above observation?

(i) Metal nitrates are highly unstable.

(ii) Metal nitrates are highly soluble in water.

Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?

Magnetic moment 2.84 B.M. is given by:

(At. nos., Ti = 22, Cr = 24, Co = 27, Ni = 28)

The number of d-electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following?

Which of the following processes does not involve oxidation of iron?

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parentheses are atomic numbers.)

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give chloride ions with silver nitrate at 25°C?

Which of these statements about [Co(CN)₆]³⁻ is true?

In which of the following compounds, the C–Cl bond ionisation shall give the most stable carbonium ion?

The reaction is called :

An organic compound 'X' having molecular formula C₅H₁₀O yields phenyl hydrazone and gives negative response to the iodoform test and Tollen's test. It produces n-pentane on reduction. 'X' could be:

Treatment of cyclopentanone with methyl lithium gives which of the following species?

The enolic form of ethyl acetoacetate as below has:

The electrolytic reduction of nitrobenzene in strongly acidic medium produces:

Biodegradable polymer which can be produced from glycine and aminocaproic acid is:

Bithionol is generally added to soaps as an additive to function as a/an:

The angular momentum of electron in 'd' orbital is equal to:

The reaction of C₆H₅CH = CHCH₃ with HBr produces:

Given:

The enthalpy of the hydrogenation of these compounds will be in the order as :

If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be:

A particle of unit mass undergoes one-dimensional motion such that its velocity varies according to v(x) = bx⁻²ⁿ where b and n are constants and x is the position of the particle. The acceleration of the particle as the function of x, is given by:

A ship A is moving Westwards with a speed of 10 km h⁻¹ and a ship B, 100 km South of A, is moving Northwards with a speed of 10 km h⁻¹. The time after which the distance between them becomes shortest, is:

Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block then the contact force between A and B is

A block A of mass m₁ rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of the table and from its other end another block B of mass m₂ is suspended. The coefficient of kinetic friction between the block and the table is μₖ. When the block A is sliding on the table, the tension in the string is:

Two similar springs P and Q have spring constants Kₚ and K_Q, such that Kₚ > K_Q. They are stretched, first by the same amount (case a), then by the same force (case b). The work done by the springs, Wₚ and W_Q are related as, in case (a) and case (b), respectively.

A block of mass 10 kg, moving in x direction with a constant speed of 10 ms⁻¹, is subject to a retarding force F=0.1xJ/m during its travel from x = 20 m to 30 m. Its final KE will be:

A particle of mass m is driven by a machine that delivers a constant power of k watts. If the particle starts from rest, the force on the particle at time t is:

A mass m moves in a circle on a smooth horizontal plane with velocity v₀ at a radius R₀. The mass is attached to a string which passes through a smooth hole in the plane as shown.

The tension in the string is increased gradually and in a circle of radius R₀/2. The final value of the kinetic energy is

A rod of weight W is supported by two parallel knife edges A and Band is in equilibrium in a horizontal position. The Knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is

Three identical spherical shells, each of mass m and radius rare placed as shown in figure. Consider an axis XX' which is touching to two shells and passing through diameter of third shell. Moment of inertia of the system consisting of these three spherical shells about XX' axis is

Kepler's third law states that the square of the period of revolution (T) of a planet around the Sun is proportional to the third power of the average distance r between the Sun and the planet, i.e., T² = Kr³ where K is constant. If the masses of the Sun and the planet are M and m respectively, then as per Newton's law of gravitation, the force of attraction between them is F = GMm/r² where G is the gravitational constant.

The relation between G and K is described as:

Two spherical bodies of mass M and 5M having radii R and 2R are released in free space with initial separation between their centres equal to 12R. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is:

the approximate depth of an ocean is 2700 m. The compressibility of water is 45.4×10⁻¹¹ Pa⁻¹ and the density of water is 10³ kg/m³. What fractional compression of water will be observed at the bottom of the ocean?

A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m². Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be (ρₐᵢᵣ = 1.2 kg/m³):

On observing light from three different stars P, Q and R, it was found that the intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If Tₚ, T_Q and T_R are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that:

The two ends of a metal rod are maintained at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be:

Figure below shows two paths that may be taken by a gas to go from a state A to a state C.

In process AB, 400 J of heat is added to the system and in process BC, 100 J of heat is added to the system. The heat absorbed by the system in the process AC will be

A Carnot engine having an efficiency of 1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is:

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure.

The change in internal energy of the gas during the transition is:

The ratio of the specific heats Cₚ/Cᵥ = γ in terms of degrees of freedom (n) is given by:

When two displacements represented by y₁​ = asin(ωt) and y₂ ​= bcos(ωt) are super-imposed, the motion is:

A particle is executing SHM along a straight line. Its velocities at distances x₁ and x₂ from the mean position are V₁ and V₂, respectively. Its time period is:

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect?

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is:

A, B and C are voltmeters of resistance R, 1.5R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are V_A, V_B and V_C respectively. Then:

A potentiometer wire has length 4 m and resistance 8 Ω. The resistance that must be connected in series with the wire and accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is:

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude:

A wire carrying current I has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicircular portion of radius R is lying in Y-Z plane. Mngnetic field at point O is

A conducting square frame of side 'a' and a long straight wire carrying current III are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity V. The emf induced in the frame will be proportional to:

A resistance R draws power P when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes Z, the power drawn will be:

A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = velocity of light).

Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is:

The refracting angle of a prism is A, and the refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is:

In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima on the double slit within the central maxima of single slit pattern?

For a parallel beam of monochromatic light of wavelength λ, diffraction is produced by a single slit whose width 'a' is the wavelength of the light. If D is the distance of the screen from the slit, the width of the central maximum will be:

Which of the following figures represents the variation of particle momentum and the associated de-Broglie wavelength?

A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photo-electric current for this light is 3V₀​. If the same surface is illuminated with light of wavelength 2λ, the stopping potential is V₀​. The threshold wavelength for this surface for photo-electric effect is:

Consider 3rd orbit of He⁺ (Helium), using non-relativistic approach, the speed of electron in this orbit will be given K = 9 × 10⁹ constant, Z = 2 and h (Planck's Constant) = 6.6 × 10⁻³⁴ J s

Two particles masses m₁, m₂​ move with initial velocities u₁ and u₂​. On collision, one of the particles get excited to higher level, after absorbing energy ε. If final velocities of be v₁​ and v₂ then we must have

If in a p–n junction, a square input signal of 10 V is applied as shown, then the output across R_L​ will be …

Which logic gate is represented by the following combination of logic gate?

The electric field in a certain region is acting radially outward and is given by

E = Aa. A charge contained in a sphere of radius 'a' centred at the origin of the field, will be

If radius of the ²⁷₁₂Al nucleus is taken to be R_Al, then radius of ¹²⁵₅₃Te nucleus is nearly: