Phy – Full Book

1

According to the law of conservation of energy, energy can be:

A Created but not destroyed B Destroyed but not created C Neither created nor destroyed D Created and destroyed

2

The motion of a wheel of a moving car is an example of:

A Translational motion B Rotational motion C Vibrational motion D Random motion

3

The efficiency of a machine is given by:

A Output energy / Input energy × 100% B Input energy / Output energy × 100% C Output power × Input power D Input power / Time

4

The resultant of two perpendicular forces of 6 N and 8 N has magnitude:

A 2 N B 10 N C 14 N D 48 N

5

The shortest distance between two points is called:

A Distance B Displacement C Speed D Acceleration

6

If a body moves with uniform velocity, its acceleration is:

A Positive B Negative C Zero D Variable

7

The turning effect of a force is called:

A Force B Torque C Momentum D Impulse

8

Which of the following is a branch of physics that deals with the study of heat and temperature?

A Mechanics B Thermodynamics C Optics D Acoustics

9

A car travels 100 m in 5 s. What is its average speed?

A 10 m/s B 20 m/s C 25 m/s D 50 m/s

10

The pressure exerted by a liquid at a given depth depends on:

A The shape of the container B The density of the liquid C The volume of the liquid D The color of the liquid

11

Which condition must be satisfied for a body to be in equilibrium under the action of several forces?

A The net force must be zero. B The net torque must be zero. C Both net force and net torque must be zero. D Only the net force must be non-zero.

12

The area under a force-displacement graph gives:

A Power B Work C Energy D Force

13

What is the temporary nature of induced magnetism in soft iron?

A It lasts for a long time B It disappears when the magnet is removed C It increases with time D It becomes permanent

14

Area under a speed-time graph gives:

A Acceleration B Distance C Speed D Time

15

A body is in dynamic equilibrium when it is:

A At rest B Moving with constant velocity C Accelerating D Rotating with constant angular acceleration

16

The sensitivity of a liquid-in-glass thermometer depends on:

A the thickness of the glass bulb B the diameter of the capillary bore C the color of the liquid D the length of the stem

17

The principle of moments states that for a body in equilibrium:

A Clockwise moments are greater than anticlockwise moments B Clockwise moments are equal to anticlockwise moments C Clockwise moments are less than anticlockwise moments D Clockwise moments are zero

18

The pressure at a point inside a liquid depends on:

A The shape of the container B The depth below the surface C The volume of the liquid D The area of the liquid surface

19

The power of a body is defined as the rate of doing:

A Work B Energy C Force D Momentum

20

If the velocity of an object is doubled, its kinetic energy becomes:

A Half B Double C Four times D Unchanged

21

A block floats in water with 1/4 of its volume above the water surface. What is the density of the block? (Density of water = 1000 kg/m³)

A 250 kg/m³ B 500 kg/m³ C 750 kg/m³ D 1000 kg/m³

22

When a body moves with uniform speed, its acceleration is:

A Positive B Negative C Zero D Variable

23

When a body is dropped freely near the Earth's surface, its acceleration is:

A Zero B 9.8 m/s² upward C 9.8 m/s² downward D Variable

24

The domain theory explains the behavior of:

A Non-magnetic materials B Ferromagnetic materials C Diamagnetic materials D Paramagnetic materials

25

According to the kinetic molecular theory, what is the main difference between the particles of a solid and a gas?

A Solid particles are stationary, while gas particles move freely. B Solid particles vibrate about fixed positions, while gas particles move randomly at high speeds. C Solid particles are larger than gas particles. D Solid particles have no kinetic energy, while gas particles do.