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# Test: Physics Mock Test - 8

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

Test: Physics Mock Test - 8 for NEET 2022 is part of NEET Mock Test Series preparation. The Test: Physics Mock Test - 8 questions and answers have been prepared according to the NEET exam syllabus.The Test: Physics Mock Test - 8 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Physics Mock Test - 8 below.
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Test: Physics Mock Test - 8 - Question 1

### The ratio of secondary to primary turns is 9:4. If power input (neglect all losses) to power input

Test: Physics Mock Test - 8 - Question 2

### In nuclear reactions, we have the conservation of

Test: Physics Mock Test - 8 - Question 3

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

Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 5
What is increased in a step-down transformer
Test: Physics Mock Test - 8 - Question 6

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

Detailed Solution for Test: Physics Mock Test - 8 - Question 6

E = 1/2 LI2

Test: Physics Mock Test - 8 - Question 7

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:

Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 9
What is the de Broglie wavelength of the α-particle accelerated through a potential difference V
Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 12

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

Test: Physics Mock Test - 8 - 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

Detailed Solution for Test: Physics Mock Test - 8 - Question 13

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

Test: Physics Mock Test - 8 - 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?
Test: Physics Mock Test - 8 - Question 15
Average density of the earth
Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 17

A current carrying coil when freely suspended will allign itself

Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - Question 19
A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
Test: Physics Mock Test - 8 - Question 20
If iron pieces loaded in a ship, are thrown into the water, then level of water will
Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 22
Shearing stress produces a change in
Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - Question 24
The ratio of the numerical values of the average velocity and average speed of a body is always
Test: Physics Mock Test - 8 - Question 25

Which of the following equations is definitely wrong?

Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 28
The magnifying power of a telescope can be increased by increasing
Test: Physics Mock Test - 8 - Question 29

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

Test: Physics Mock Test - 8 - 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?

Detailed Solution for Test: Physics Mock Test - 8 - Question 30

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

Test: Physics Mock Test - 8 - Question 31
An object is placed 40 cm infront of a convex mirror of radius of curvature 20 cm. The image
Test: Physics Mock Test - 8 - Question 32
Angular momentum is
Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - 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)
Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - Question 38

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

Test: Physics Mock Test - 8 - 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
Test: Physics Mock Test - 8 - Question 40

Magnetic field is measured in

Test: Physics Mock Test - 8 - 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

Test: Physics Mock Test - 8 - Question 42
When a source is linear, the wavefront is
Test: Physics Mock Test - 8 - Question 43
Quality of a musical note depends on
Test: Physics Mock Test - 8 - Question 44
In which case does the potential energy decrease
Test: Physics Mock Test - 8 - 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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