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# AFMC Physics Mock Test - 4

## 50 Questions MCQ Test AFMC Mock Test Series 2020 | AFMC Physics Mock Test - 4

Description
This mock test of AFMC Physics Mock Test - 4 for NEET helps you for every NEET entrance exam. This contains 50 Multiple Choice Questions for NEET AFMC Physics Mock Test - 4 (mcq) to study with solutions a complete question bank. The solved questions answers in this AFMC Physics Mock Test - 4 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this AFMC Physics Mock Test - 4 exercise for a better result in the exam. You can find other AFMC Physics Mock Test - 4 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### A dry cell has an e.m.f. of 1.5 V and an internal resistance of 0.05 Ω. The maximum current obtainable from this cell for a very short time interval is

Solution:
QUESTION: 4

Two resistances of 400 Ω and 800 Ω are connected in series with 6 volt battery of negligible internal resistance. A voltmeter of resistance 10,000 Ω is used to measure the potential difference across 400 Ω . The error in the measurement of potential difference in volts approximately is

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QUESTION: 5

The Lenz's law gives

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QUESTION: 6

A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If capacitance between any two adjacent plates is C, then the resultant capacitance is

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QUESTION: 7

The mass of a particle is 400 times than that of an electron and the charge is double. The particle is accelerated by 5 V. Initially the particle remained in rest, then its final kinetic energy will be

Solution:

B

Solution :

ΔE=2e×5V=10eV

⇒ Final kinetic energy =10eV

QUESTION: 8

A 220 V, 1000 watt bulb is connected across a 110 V mains supply. The power consumed will be

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QUESTION: 9

The average power dissipation in a pure capacitor in AC circuit is

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QUESTION: 10

Photoelectric effect proves the

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QUESTION: 11

There is an electric field E in x-direction. If the work done on moving a charge of 0.2C through a distance of 2m, along a line making an angle 60° with x-axis is 4 J, then what is the value of E?

Solution:
QUESTION: 12

A rocket can go vertically upwards in earth's atmosphere because

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QUESTION: 13

Two capacitors of capacity 4 μF and 6 μF are connected in series and a battery is connected to the combination the energy stored is E1. If they are connected in parallel and if the same battery is connected to this combination the energy stored is E2. The ratio of E1 and E2 is

Solution:

As the capacitors are connected in series

As the capacitors are connected in parallel

QUESTION: 14

A wagon weighing 1000 kg is moving with velocity of 50 km/h on smooth horizontal rails. A mass of 250 kg is deopped into it. The velocity with which it moves now is

Solution:
QUESTION: 15

A glof ball of mass 0.05 kg placed on a tee, is struck by a golf club. The speed of the golf ball as it leaves the tee is 100 m/s, the time of contact between them is 0.02 s. If the force decreases to zero linearly with time, then the force at the beginning of the contact is

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QUESTION: 16

The root mean square velocity of the gas molecules is

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QUESTION: 17

At a given temperature the root mean square velocities of oxygen and hydrogen moleucles are in the ratio

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QUESTION: 18

A current of 2 ampere flows in a long, straight wire of radius 2 mm. The intensity of magnetic field at the axis of the wire is

Solution:
QUESTION: 19

A spherical black body with a radius of 12 cm radiates 450 W power at 500 K. If the radius were halved and the temperature doubled, the power radiated in wattt would be

Solution:

Power radiated P = σ AT4 = a (4πr2). T

⇒ P2 = 450 x 4 = 1800 W

QUESTION: 20

The rate of flow of water in a capillary tube of length 'l' and radius 'r' is 'V'. The rate of flow in another capillary tube of length '2l' and radius '2r' for same pressure difference would be

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QUESTION: 21

The velocity of efflux of an ideal liquid depend upon

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QUESTION: 22

Two spheres of equal masses but radii r1 and r2 are allowed to fall in a liquid of infinite column. The ratio of their terminal velocities are

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QUESTION: 23

A wooden cube is floating water with a body of mass 200 g placed on it. When the body is removed, the cube rises 2 cm above the water level. The side of the cube is

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QUESTION: 24

Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. If Young's modulus of steel is twice that of copper, then ratio of elastic potential energies stored per unit volume in steel wire to that in copper wire is

Solution:
QUESTION: 25

The extension in a string, obeying the Hooke's law, is x. The speed of sound in the stretched string is v. If the string is extended to 1.5 x, then speed of sound will be

Solution:

Speed of sound in a stretched string
Where T is the tension in the string and μ is mass per unit length
According to Hooke's law, F ∝ x

QUESTION: 26

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

Solution:
QUESTION: 27

A stone of mass of 16 kg is attached to a string 144 m long and is whirled in a horizontal circle. The maximum tension the string can withstand is 16 Newton. The maximum velocity of revolution that can be given to the stone without breaking it, will be

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QUESTION: 28

Two white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? (Take wavelength of light = 500 nm)

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QUESTION: 29

Which one of the following is ture for a small iron ball when placed just at the centre of the horizontal pole pieces of a strong electromagnet and then released ?

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QUESTION: 30

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The nature of image is

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QUESTION: 31

A prism is made up of material of refractive index √3. The angle of the prism is A. If the angle of minimum deviation is equal to the angle of the prism, then the value of A is

Solution:

We know for a prism

= 2cosA/2
⇒

QUESTION: 32

The far point of a myopic eye is 1.5 m. To correct this defect of the eye, the power of lens is

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QUESTION: 33

A couple produces a

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QUESTION: 34

Which of the following statements about angular momentum is correct ?

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QUESTION: 35

Rotatory motion of a body is produced by applying a

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QUESTION: 36

A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is K. If radius of the ball be R, then the fraction of total energy associated with its rotational energy will be

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QUESTION: 37

The angular momentum of a moving body remains constant, if some

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QUESTION: 38

The magnitude of acceleration of particle executing simple harmonic motion, at the position of maximum displacement is

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QUESTION: 39

Bonding in a germanium crystal (semiconductor) is

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QUESTION: 40

A block of mass 100 gm slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is

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QUESTION: 41

Dimensions of coefficient of viscosity are

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QUESTION: 42

SI unit of magnetic dipole moment is

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QUESTION: 43

If radius of a circle is 2.14 m, then area of the circle, with due regards for significant figures, will be

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QUESTION: 44

Huygen's wave theory allows us to know

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QUESTION: 45

When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

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QUESTION: 46

The equation of a wave is given as y = 0.07 sin(12πx - 3000πt). Where x is in metre and t in sec, then the correct statement is

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QUESTION: 47

An open kinife edge of mass M is dropped from a height h on a wooden floor. If the blade penetrates a distance s into the wood. the average resistance offered by the wood to the blade is

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QUESTION: 48

When light wave suffer reflection at the interface between air and glass, the change of phase of reflected wave is equal to

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QUESTION: 49

A solid is immersed completely in a liquid. The coefficients of volume expansion of solid and the liquid are γ1γ1 and γ2γ2 (<γ1)<γ1. The temperatures of both are increased.

Q. Upthrust on the solid will

Solution:
QUESTION: 50

A solid is immersed completely in a liquid. The coefficients of volume expansion of solid and the liquid are γ1γ1 and γ2γ2 (<γ1)<γ1. The temperatures of both are increased.

Q. Apparent weight of the solid will

Solution: