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# Test: Physics Mock- 3

## 45 Questions MCQ Test NEET Mock Test Series | Test: Physics Mock- 3

Description
This mock test of Test: Physics Mock- 3 for NEET helps you for every NEET entrance exam. This contains 45 Multiple Choice Questions for NEET Test: Physics Mock- 3 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Physics Mock- 3 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this Test: Physics Mock- 3 exercise for a better result in the exam. You can find other Test: Physics Mock- 3 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

### The centre of mass of two particles with masses 4kg and 2kg located at (1,0,1), (2,2,0) respectively has the coordinates

Solution:
QUESTION: 4

A body of mass m is moving in a circle of radius r with a constant speed υ. The force on the body is mυ2/r and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

Solution:
QUESTION: 5
A bomb of mass 9Kg explodes into two pieces of masses 3Kg and 6Kg. The velocity of the 3Kg mass is 16 ms-1. Then kinetic energy of 6Kg mass is
Solution:
QUESTION: 6

The image of the sun is formed on the photosensitive metal with a convex lens and the photoelectric current is I . If the lens is replaced by another similar lens of half the diameter and double the focal length, then photoelectric current will be

Solution:

Since, light gathering power, i.e, intensity is reduced by a

factor of 4 on making the diameter half, and intensity of incident light

is proportional to the photoelectric current.

QUESTION: 7
A choke coil has
Solution:
QUESTION: 8
Three copper wires have lengths and cross-sectional areas of (l and A), (2l and A/2) and (l/2 and 2A). Resistance will be minimum in
Solution:
QUESTION: 9
Two cells A and B are connected in the secondary circuit of a potentiometer one at a time and the balancing length are respectively 400cm and 440cm. The e.m.f of the cell A is 1.08 volt. The e.m.f of the second cell B in volts is
Solution:
QUESTION: 10

A wheel having metal spokes of 1m long between its axle and rim is rotating in a magnetic field of flux density 5 x 10 − 5 T normal to the plane of the wheel. An e.m.f of 22/7 m V is produced between the rim and the axle of the wheel. The rate of rotation of the wheel in radians per second is

Solution:
QUESTION: 11

Two electric charge 12 μ C and − 6 μ C are places 20 cm apart in air. There will be a point P at which electric potential is zero on the line joining these two charges and outside, excluding the region between them. The distance of P from − 6 μ C charge is

Solution:
QUESTION: 12

There is a uniform electric field of strength 103 V m−1 along Y-axis. A body of mass 1 gm and charge 10 − 6 C is projected into the field from orgin along the positive X-axis with a velocity of 10 ms−1 . Its speed in ms−1 after 10s is (Neglect graviation )

Solution:
QUESTION: 13
Pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is α. then the magnitude of force required to move the body is equal to
Solution:
QUESTION: 14

The escape velocity of an object from the earth depends upon the mass of the earth (M), its mean density (ρ),its radius (R) and gravitational constant (G). Thus the formula for escape velocity is

Solution:
QUESTION: 15

The acceleration due to gravity at a height above the surface of the earth is 9ms−2 . Its value at a point at an equal distance below the surface of the earth is (take g = 10ms−2 on the surface)

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QUESTION: 16
There are two identical vessels filled with equal amounts of ice. The vessels are of different metals. If the ice melts in the two vessels in 20 and 35 minutes respectively, the ratio of the coefficients of thermal conductivity of the two metals is
Solution:
QUESTION: 17
Kinetic theory of gases provide a base for
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QUESTION: 18
A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The magnetic field far away will be
Solution:
QUESTION: 19
Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry respectively 0.2 A and 0.3 A currents in opposite direction. The magnetic field in tesla at the centre is
Solution:
QUESTION: 20

The direction of magnetic line of force of a bar magnet is

Solution:
QUESTION: 21

24 cm3 of water flows per second through a capillary tube of radius r cm and length l cm, when connected to a pressure head h cm of water. If a tube of the length l/2 cm and radius r/2 cm is connected to the same pressure head, then volume of water flowing per second through the tube is

Solution:
QUESTION: 22

A wire of length L and area of cross-section A is made of material of Young's modulus y. If the wire is stretched by the amount x, the work done is

Solution:
QUESTION: 23

A cord is wound round the circumference of wheel of radius r. The axis of the wheel is horizontal and moment of inertia about it is I. A weight mg is attached to the end of the cord and falls from rest. After falling through a distance h, the angular velocity of the wheel will be

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QUESTION: 24

A man throws a ball vertically upward and it rises through 20 m and returns to his hands. What was the initial velocity (u) of the ball and how much time (t) it remained in the air? (g = 10 m/s2)

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QUESTION: 25

The angularspeed of seconds needle in a mechanical watch is

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QUESTION: 26

Three light strings are connected at the point P. A weight W is suspended from one of the strings .End A of string AP and end B of string PB are fixed as shown .In equilibrium PB is horizontal and PA makes an angle of 60o with the horizontal .If the tension in PB is 30 N then the tension in PA and weight W are respectively

Solution:
QUESTION: 27

A body of mass m is moving in a circle of radius r with a constant speed υ. The force on the body is mυ2/r and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

Solution:
QUESTION: 28
If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of objective
Solution:
QUESTION: 29
The period of simple pendulum is doubled, when
Solution:
QUESTION: 30

A particle of mass m is projected with the velocity ν making an angle of 45o with the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)

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QUESTION: 31
Which of the following statements is correct about rainbow ?
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QUESTION: 32

In a uniform circular motion (horizontal) of a ball tied with a string, velocity at any time is at angle θ with acceleration, then θ is = 60

Solution:
QUESTION: 33
A boat is moving with a velocity 3î+4ĵ with respect to the ground. The water in the river is flowing with a velocity -3î-4ĵ with respect to the ground. The velocity of the boat relative to the water is
Solution:
QUESTION: 34
A particle is simultaneously acted upon by two forces, one of 3 N and the other of 4 N. The net force on the particle is
Solution:
QUESTION: 35
A square frame of side L is dipped in a liquid. On taking out, a membrane is formed.If the surface tension of the liquid is T, the force acting on the frame will be
Solution:
QUESTION: 36

A copper voltmeter is in series with a heater coil of resistance 0.1 Ω. A steady current flows in the circuit for 20 min and a mass of 0.99 g of copper is deposited at the cathode. If electrochemical equivalent of copper is 0.00033 g-C⁻¹, then heat generated in the coil is

Solution:
QUESTION: 37
The resistance of a cell does not depend on
Solution:
QUESTION: 38

22 gram of CO₂ at 27°C is mixed with 16 gram of oxygen at 37°C. The temp. of the mixture is

Solution:
QUESTION: 39
The first law of thermodynamics is concerned with the conservation of
Solution:
QUESTION: 40

Unit of impulse is

Solution:

The SI unit of impulse is the newton second (N⋅s), and the dimensionally equivalent unit of momentum is the kilogram meter per second (kg⋅m/s).

QUESTION: 41

If the measurement of a length is made as (227±1) mm, then percentage error in the measurement is

Solution:
QUESTION: 42
The maximum intensity in interference pattern is how many times the intensity due to each slit?
Solution:
QUESTION: 43
The equation of a sound wave is
y = 0.0015 sin (62.4x + 316t)
The wavelength of this wave is
Solution:
QUESTION: 44

On stretching a spring by 0.1 m, a elastic potential energy of 5 J is stored in it. The force constant of the spring is

Solution:
QUESTION: 45

A bullet mass 10 gm is fired from a gun of mass 1 kg. If the recoil velocity is 5 m/s, the velocity of the muzzle is

Solution:

If the bullet and gun is considered a system, the force exerted by trigger will be internal
Now, according to the law of conservation of momentum
Initital momentum of gun = Momentum imparted to bullet and muzzle
⇒ 1000 x 5 = 10 x v
⇒ v (Velocity of muzzle) = 500 ms-1