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NEET Practice Test - 3 - Question 1

A rigid container with thermally insulated walls contains a coil of resistance 100 Ω, carrying current 1 A. Change in internal energy after 5 min will be

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NEET Practice Test - 3 - Question 2

Two spherical bodies of mass M and 5M and radii R and 2R respectively 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 distance covered by the smaller body just before collision is

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NEET Practice Test - 3 - Question 3

Two particles of mass m each are tied at the ends of a light string of length 2a. The whole system is kept on a frictionless horizontal surface with the string held tight so that each mass is at a distance a from the centre P (as shown in the figure). Now, the mid-point of the string is pulled vertically upwards with a small but constant force F. As a result, the particles move towards each other on the surface. The magnitude of acceleration, when the separation between them becomes 2x, is

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NEET Practice Test - 3 - Question 4

Statement I : The formula connecting u, υ and f for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.

**Statement II :** Laws of reflections are strictly valid for plane surfaces, but not for large spherical surfaces.

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NEET Practice Test - 3 - Question 5

A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be

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NEET Practice Test - 3 - Question 6

The pressure of a medium is changed from 1.01 × 10^{5} Pa to 1.165 × 10^{5} Pa and change in volume is 10% keeping temperature constant. The bulk modulus of the medium is

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NEET Practice Test - 3 - Question 7

An inductor of inductance 2.0 mH is connected across a charged capacitor of capacitance 5.0 μF and the resulting L-C circuit is set oscillating at its natural frequency. Let Q denote the instantaneous charge on the capacitor and I the current in the circuit. It is found that the maximum value of Q is 200 μC. When Q = 100 μC, what is the value of

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NEET Practice Test - 3 - Question 8

A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector is correctly shown in

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NEET Practice Test - 3 - Question 9

A charge +q is fixed at each of the points x = x_{0}, x = 3x_{0}, x = 5x_{0} ........∞ on the x−axis and a charge −q is fixed at each of the points x = 2x_{0}, x = 4x_{0}, x = 6x_{0} .........,∞. Here, x_{0} is a positive constant. Take the electric potential at a point due to a charge Q at a distance r from it to be Then the potential at the origin due to the above system of charges is

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NEET Practice Test - 3 - Question 10

The earth radiates in the infra-red region of the spectrum. The wavelength of the maximum intensity of the spectrum is correctly given by

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NEET Practice Test - 3 - Question 12

The half-life of ^{131}I is 8 days Given a sample of ^{131}I at time t = 0, we can assert that

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NEET Practice Test - 3 - Question 13

Two particles A and B of masses m_{A} and m_{B} respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are v_{A} and v_{B} respectively and the trajectories are as shown in the figure. Then

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NEET Practice Test - 3 - Question 14

In common base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor, β will be

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NEET Practice Test - 3 - Question 15

Two particles A and B initially at rest, move towards each other, under the mutual force of attraction. At an instance when the speed of A is v and the speed of B is 2v, the speed of the centre of mass(CM) is

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NEET Practice Test - 3 - Question 17

A block of mass 5 kg is moving in x-direction with a constant speed 20 m/s. Now it is subjected to a retarding force F_{r} = – 0.2 x J/m during its travel from x = 10 m to x = 20 m. Its final velocity will be nearly

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NEET Practice Test - 3 - Question 18

When two spheres of equal masses undergo oblique elastic collision with one of them at rest initially, after collision they will move

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NEET Practice Test - 3 - Question 19

Two springs of spring constants 500 N m^{–1} and 500 N m^{–1} are stretched with force 100 N and 200 N respectively. They have potential energy in the ratio of

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NEET Practice Test - 3 - Question 20

Which of the diagram shown in figure represents the variation of total mechanical energy of pendulum oscillating in air as a function of time?

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NEET Practice Test - 3 - Question 21

An object has displacement from position vector

under the effect of a force The work done by this force will be

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NEET Practice Test - 3 - Question 22

A bus of mass 5 metric tonne is pulled at a speed of 18 km/h on a smooth inclination 1 in 10. Power of the engine is

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NEET Practice Test - 3 - Question 23

A ball A moving with certain velocity collides head on with another body B of the same mass at rest. If the coefficient of restitution is 3/4. The ratio of velocity A and B after collision is

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NEET Practice Test - 3 - Question 24

A force of 1 N acts on a 1 kg mass for 1 second which is initially at rest. In another case 1 N force acts on 1 kg mass which is initially at rest and moves it through 1 m. The ratio of kinetic energy in the two cases is

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NEET Practice Test - 3 - Question 25

A body is being raised to a height h from the surface of earth. What is the sign of work done by applied force and gravitational force respectively?

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NEET Practice Test - 3 - Question 26

A force acting on a body maintains its velocity If rate of change of kinetic energy of the body is zero, then the value of α will be

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NEET Practice Test - 3 - Question 27

A body is initially at rest. It undergoes one dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

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NEET Practice Test - 3 - Question 29

A ball of mass m collides with a wall with speed v and rebounds on the same line with the same speed. If mass of the wall is taken infinite at rest, then work done by the ball on the wall is

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NEET Practice Test - 3 - Question 30

Statement-A: Work done by frictional force is always negative.

**Statement-B:** A body at rest can have mechanical energy.

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NEET Practice Test - 3 - Question 31

A body of mass 5 kg moves according to the relation x = t^{2} + 2 t^{3}. The power used by the body at t = 2 s is

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NEET Practice Test - 3 - Question 32

A free falling body takes 6 s to reach the ground. Three second after release, the percentage of retained potential energy to its initial potential energy is

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NEET Practice Test - 3 - Question 33

Two masses of 1 kg each move towards each other with speed 4 m/s and 2 m/s collide and stick together. The final kinetic energy of the system will be

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NEET Practice Test - 3 - Question 34

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

**Assertion:** If there were no gravitational force, the path of the projected body always be a straight line.

**Reason: **Gravitational force makes the path of projected body always parabolic.

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NEET Practice Test - 3 - Question 35

Consider the following table:

The above given table is a truth table for

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NEET Practice Test - 3 - Question 36

The average energy density of magnetic field of an EM wave is given by

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NEET Practice Test - 3 - Question 37

A rectangular glass slab ABCD of refractive index n_{1} is immersed in water of refractive index n_{2} (n_{1} > n_{2}). A ray of light is incident at the face AB of the slab as shown in the figure. The maximum value of the angle of incidence such that the ray comes out only from the other side CD is given by

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NEET Practice Test - 3 - Question 38

An X-ray tube is operated at a constant potential difference and it is required to get X-ray of wave length not less than 0.2 nanometre. Then, the potential difference in kV is (h = 6.63 × 10^{-34}Js, e = 1.6 × 10^{-19} C, c = 3 × 10^{8} m/s)

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NEET Practice Test - 3 - Question 39

A nucleus has mass represented by M(A, Z). If M_{p} and M_{n} denote the masses of proton and neutron, respectively, and B.E. the binding energy in MeV, then

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NEET Practice Test - 3 - Question 40

In the energy band diagram of the material shown below, the open circles and filled circles denote holes and electrons, respectively. The material is

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NEET Practice Test - 3 - Question 41

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is

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NEET Practice Test - 3 - Question 42

The external and internal radii of a hollow cylinder are measured to be (4.23 ± 0.01) cm and (3.89 ± 0.01) cm, respectively. The thickness of the wall of the cylinder is

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NEET Practice Test - 3 - Question 43

Match the following (Take the relative strength of the strongest fundamental forces in nature as one)

**The correct match is**

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NEET Practice Test - 3 - Question 44

Directions: Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

**Assertion: **If a body of mass m is projected upwards with a speed V making an angle ? with the vertical, than the change in the momentum of the body along X–axis is zero.

**Reason:** Mass of the body remains constant along X–axis

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NEET Practice Test - 3 - Question 45

The wire shown in the figure below carries a current of 40 A. If r = 3.14 cm, the magnetic field at point P will be

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NEET Practice Test - 3 - Question 46

Given that the abundance of isotopes _{54}Fe, _{56}Fe and _{57}Fe are 5 %, 90 % and 5 % respectively, what is the atomic mass of Fe?

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NEET Practice Test - 3 - Question 47

The solubilities of carbonates decrease down the magnesium group due to a decrease in

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NEET Practice Test - 3 - Question 49

When 25 g of a non-volatile solute is dissolved in 100 g of water, the vapour pressure is lowered by 2.25 × 10^{-1} mm of Hg. If the vapour pressure of water at 20^{o}C is 17.5 mm of Hg, what is the molecular weight of the solute?

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NEET Practice Test - 3 - Question 50

A sample of air contains only N_{2}, O_{2} and H_{2}O. It is saturated with water vapours and the total pressure is 640 torr. The vapour pressure of water is 40 torr and the molar ratio of N_{2} : O_{2} is 3 : 1. The partial pressure of N_{2} in the sample is

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NEET Practice Test - 3 - Question 53

Which of the following acts as an oxidizing as well as reducing agent?

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NEET Practice Test - 3 - Question 54

A metallic element has a cubic lattice. Each edge of the unit cell is 2Å. The density of the metal is 2.5 g cm^{−3}. The unit cells in 200 g of the metal are

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NEET Practice Test - 3 - Question 55

Distillation of concentrated HNO_{3} with phosphorus pentoxide produces

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NEET Practice Test - 3 - Question 57

In a saturated solution of the sparingly soluble electrolyte AgIO_{3} (molecular mass = 283), the equilibrium which sets in is AgIO_{3} (s) ⇌ Ag^{+} (aq)+IO^{−}_{3} (aq).

If the solubility product constant K_{sp} of AgIO_{3} at a given temperature is 1.0 × 10^{−8}, what is the mass of AgIO_{3} in 100 mL of its saturated solution?

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NEET Practice Test - 3 - Question 58

Copper crystallises into an FCC lattice with edge length 3.61 × 10^{-8} cm. Its calculated density g cm^{-3} is?

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NEET Practice Test - 3 - Question 62

Which of the following graphs represents Henry’s law? (Where x = mole fraction of dissolved gas, K_{H} = 2000 kbar)

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NEET Practice Test - 3 - Question 63

Resistance of a 0.1 M KCI solution in a conductance cell is 200 ohm and conductivity is 0.015 S cm^{-1}. The value of cell constant is

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NEET Practice Test - 3 - Question 64

Which of the following is a zero order reaction?

(Reactant NH_{3} is strongly adsorbed)

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NEET Practice Test - 3 - Question 65

How many half lives are required to complete 93.75% of a first order reaction?

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NEET Practice Test - 3 - Question 66

A cube of 1 m edge length is crushed in order to get small cubes of edge length 1 mm. By which factor does the surface area increase?

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NEET Practice Test - 3 - Question 67