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# Test: Physics Mock- 8

## 45 Questions MCQ Test NEET Mock Test Series | Test: Physics Mock- 8

Description
This mock test of Test: Physics Mock- 8 for NEET helps you for every NEET entrance exam. This contains 45 Multiple Choice Questions for NEET Test: Physics Mock- 8 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Physics Mock- 8 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this Test: Physics Mock- 8 exercise for a better result in the exam. You can find other Test: Physics Mock- 8 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

### Two particles of masses 1kg and 3kg have position vectors and respectively. The centre of mass has a position vector

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QUESTION: 4
A string breaks if its tension exceeds 10 newtons. A stone of mass 250 gm tied to this string of length 10 cm is rotated in a horizontal circle. The maximum angular velocity of rotation can be
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QUESTION: 5
What is increased in a step-down transformer
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QUESTION: 6

An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, 1 kg first part moving with a velocity of 12 ms−1 and 2 kg second part moving with a velocity of 8 ms−1 . If the third part flies off with a velocity of 4 ms −1 , its mass would be:

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QUESTION: 7

Energy needed to establish an alternating current I in a coil of self inductance L is

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E = 1/2 LI2

QUESTION: 8
Three identical cells each of e.m.f. 2 V and unknown internal resistances are connected in parallel. This combination is connected to a 5 Ω resistor. If the terminal voltage across the cell is 1.5 V, then internal resistance of each cell is
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QUESTION: 9
What is the de Broglie wavelength of the α-particle accelerated through a potential difference V
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QUESTION: 10
The resistance of a 5 cm long wire is 10Ω. It is uniformly stretched so that its length becomes 20cm. The resistance of the wire is
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QUESTION: 11
Five equal capacitors connected in series have a resultant capacitance of 4 $\mu$F. The total energy stored in these, when these are connected in parallel and charged to 400V is
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QUESTION: 12

If an unchanged capacitor is charged by connecting it to a battery, then the amount of energy lost as heat is

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QUESTION: 13

300 Joule of work is done in sliding a 2 kg. block on an inclined plane to a height of 10 meters. Taking value of acceleration due to gravity 'g' to be 10 m/s2, work done against friction is

Solution:

Work done in lifting 2 kg mass upto height 10 metres is given by
W = mgh
= 2 x 10 x 10 = 200 J
Work done against friction
= 300 - 200 = 100 joule

QUESTION: 14
What will be the acceleration due to gravity on the surface of the moon, if its radius is 1/4th the radius of the earth and its mass is 1/80th the mass of the earth?
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QUESTION: 15
Average density of the earth
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QUESTION: 16
On giving equal amount of heat to equal masses of a monoatomic and a diatomic gas the rise in temprature (∆T) is more for
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QUESTION: 17

A current carrying coil when freely suspended will allign itself

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QUESTION: 18

The temperature of a body falls from 50oC to 40oC in 10 minutes. If the temperature of the surroundings is 20oC Then temperature of the body after another 10 minutes will be

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QUESTION: 19
A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
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QUESTION: 20
If iron pieces loaded in a ship, are thrown into the water, then level of water will
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QUESTION: 21
The force between two short bar magnets with magnetic moments M₁ and M₂ whose centres are r meter apart is 8 N, when their axes are in same line. If the separation is increased to 2 r, the force between them is reduced to
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QUESTION: 22
Shearing stress produces a change in
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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
The ratio of the numerical values of the average velocity and average speed of a body is always
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QUESTION: 25

Which of the following equations is definitely wrong?

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QUESTION: 26

A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1kg/sec and at a speed of 5 m/sec. The initial acceleration of the block will be

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QUESTION: 27
A river is flowing from east to west at a speed of 5 m/min. A man on South bank river, capable of swimming 10 m/min in still water, wants to swim across the river in shortest time he should swim
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QUESTION: 28
The magnifying power of a telescope can be increased by increasing
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QUESTION: 29

The potential energy of a particle executing simple harmonic motion from a distance x from its equilibrium position is

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QUESTION: 30

Two projectiles are fired at different angles with the same magnitude of velocity, such that they have the same range. At what angles they might have been projected?

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For equal range, the particle should either be projected at an angle θ or (90 - θ)

QUESTION: 31
An object is placed 40 cm infront of a convex mirror of radius of curvature 20 cm. The image
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QUESTION: 32
Angular momentum is
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QUESTION: 33

If î denotes a unit vector along incident light, r̂ a unit vector along refracted ray into medium of refractive index μ and n̂ a unit vector normal to the boundary of the media, directed towards incident medium, then the law of refraction can be written as

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QUESTION: 34
A boat, which has a speed of 5 km/hr in still water, crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water in km/hr is
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QUESTION: 35
The rate of steady volume flow of water through a capillary tube of length 'l' and radius 'r' under a pressure difference of P is V . This tube is connected with another tube of same but half the radius in series. Then the rate of steady volume flow through them is (pressure across the combination is P)
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QUESTION: 36

Consider the two following statements A and B and identify the correct choice even in the answers (A) Duddells thermo-galvanometer is suitable to measure direct current only (B) Thermopile can measure temperature differences of the order of 10⁻3 oC

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QUESTION: 37

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20oC ? The temperature of boiling water is 100oC

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QUESTION: 38

Heat given to a body which rises its temperature by 1oC is

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QUESTION: 39
When the amount of work done is 300 J and change in internal energy is 100 J, then the heat energy supplied is
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QUESTION: 40

Magnetic field is measured in

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QUESTION: 41

The force F on a sphere of radius 'a' moving in a medium with velocity 'V' is given by F = 6 π η aV. The dimensions of η are

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QUESTION: 42
When a source is linear, the wavefront is
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QUESTION: 43
Quality of a musical note depends on
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QUESTION: 44
In which case does the potential energy decrease
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QUESTION: 45

A block of mass 10 kg is moving in x-direction with a constant velocity of 10 m−s⁻1. It is subjected to a retarding force F = 0.1x J-m⁻1 during its travel from x = 20 m to x = 30 m. Its final kinetic energy will be

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