physics MCQs - 11th class Chapter 03 Mcqs

1

The change in the position of a body from its initial to its final position is called?

A

Velocity

B

Acceleration

C

Displacement

D

Speed

2

The time rate of change of displacement is known as?

A

Velocity

B

Acceleration

C

Force

D

Momentum

3

Instantaneous velocity is the limiting value of Δd/Δt as the time interval Δt approaches?

A

Infinity

B

One

C

Zero

D

A constant value

4

A body is said to be moving with uniform velocity if its instantaneous velocity?

A

Increases

B

Decreases

C

Does not change

D

Becomes zero

5

The time rate of change of velocity of a body is called?

A

Displacement

B

Speed

C

Inertia

D

Acceleration

6

For a body moving with uniform acceleration, its average acceleration is equal to its?

A

Initial velocity

B

Final velocity

C

Instantaneous acceleration

D

Zero

7

On a velocity-time graph, a horizontal straight line represents?

A

Uniform acceleration

B

Variable acceleration

C

Constant velocity

D

Rest

8

The slope of the velocity-time graph for an object moving with constant acceleration is a?

A

Curve

B

Straight line

C

Circle

D

Parabola

9

The area between the velocity-time graph and the time axis is numerically equal to the?

A

Acceleration

B

Force

C

Distance covered

D

Power

10

In the absence of air resistance, all objects in free fall have the same?

A

Velocity

B

Displacement

C

Weight

D

Uniform acceleration

11

The value of acceleration due to gravity (g) near the Earth's surface is approximately?

A

9.8 m/s

B

9.8 ms⁻²

C

8.9 m/s²

D

10 ms⁻²

12

Newton's laws were published in 1687 in his famous book called?

A

Opticks

B

Principia

C

De Motu

D

Geometriae

13

Newton's first law of motion is also known as the law of?

A

Action-reaction

B

Inertia

C

Momentum

D

Gravity

14

The quantitative measure of an object's inertia is its?

A

Velocity

B

Acceleration

C

Mass

D

Force

15

A frame of reference in which Newton's first law of motion holds is known as?

A

A non-inertial frame

B

An accelerated frame

C

An inertial frame of reference

D

A rotational frame

16

According to Newton's second law, the acceleration produced in a body is directly proportional to the?

A

Mass

B

Applied force

C

Velocity

D

Inertia

17

Newton's third law of motion states that action and reaction are?

A

Equal and in the same direction

B

Unequal and opposite

C

Equal and opposite

D

Unequal and in the same direction

18

Linear momentum (p) is defined by the relation?

A

p = m/v

B

p = mv²

C

p = ma

D

p = mv

19

The SI unit of linear momentum is?

A

kg m s⁻²

B

N m

C

kg m s⁻¹

D

J s

20

The unit Newton-second (Ns) is equivalent to the unit of?

A

Force

B

Work

C

Power

D

Momentum

21

The time rate of change of momentum of a body equals the?

A

Applied force

B

Its velocity

C

Its acceleration

D

The impulse

22

The product of force and the time for which the force acts (F x t) is called?

A

Work

B

Power

C

Impulse

D

Momentum

23

For an isolated system, the total linear momentum remains?

A

Zero

B

Constant

C

Increasing

D

Decreasing

24

In an inelastic collision, which of the following is NOT conserved?

A

Momentum

B

Total energy

C

Mass

D

Kinetic energy

25

In a perfectly elastic collision, which of the following is conserved?

A

Kinetic energy only

B

Momentum only

C

Both momentum and kinetic energy

D

Neither momentum nor kinetic energy

26

When a light body collides with a massive body at rest, the light body will?

A

Stop

B

Move forward with the same velocity

C

Bounce back with the same velocity

D

Remain stationary

27

When a massive body collides elastically with a light stationary body, the lighter body moves off with approximately?

A

The same velocity as the massive body

B

Half the velocity of the massive body

C

Twice the velocity of the massive body

D

Zero velocity

28

The force exerted on a wall by water striking it normally is calculated as the product of mass per second and?

A

Acceleration

B

Change in velocity

C

Distance

D

Time

29

When a shell explodes in mid-air, the total momentum of all its fragments?

A

Becomes zero

B

Increases

C

Decreases

D

Equals the initial momentum of the shell

30

The recoil of a rifle when a bullet is fired is an example of the conservation of?

A

Energy

B

Mass

C

Momentum

D

Charge

31

A rocket moves by expelling burning gas. The rocket gains momentum equal to the momentum of the?

A

Expelled gas in the same direction

B

Rocket itself

C

Expelled gas but in the opposite direction

D

Surrounding air

32

The acceleration of a rocket increases as the fuel is burned because?

A

Its velocity increases

B

Its mass decreases

C

The thrust increases

D

Gravity decreases

33

Projectile motion is a type of?

A

One-dimensional motion

B

Two-dimensional motion

C

Three-dimensional motion

D

Rotational motion

34

In projectile motion, ignoring air resistance, the horizontal component of velocity?

A

Increases

B

Decreases

C

Remains constant

D

Becomes zero at the top

35

In projectile motion, the vertical component of acceleration is always?

A

Zero

B

g, upwards

C

g, downwards

D

Variable

36

The path followed by an un-powered and un-guided missile is called a?

A

Circular trajectory

B

Linear trajectory

C

Hyperbolic trajectory

D

Ballistic trajectory

37

The horizontal range of a projectile is maximum for a projection angle of?

A

30°

B

45°

C

60°

D

90°

38

The equation for the maximum height of a projectile is given by?

A

h = (vi² sinθ) / 2g

B

h = (vi² sin²θ) / 2g

C

h = (vi sin²θ) / g

D

h = (vi² sin2θ) / g

39

The time of flight of a projectile is given by the formula?

A

t = (vi sinθ) / g

B

t = (2vi sinθ) / g

C

t = (vi cosθ) / g

D

t = (2vi sin²θ) / g

40

The horizontal range of a projectile is given by the formula?

A

R = (vi² sinθ) / g

B

R = (vi² cosθ) / g

C

R = (vi² sin2θ) / g

D

R = (2vi² sinθ) / g

41

If two bodies of equal masses collide elastically, with the second body at rest, the first body will?

A

Come to rest

B

Bounce back

C

Move with half velocity

D

Continue with the same velocity

42

Impulse has the same units as?

A

Force

B

Energy

C

Momentum

D

Power

43

The law of conservation of momentum applies to?

A

A single body

B

An isolated system

C

A non-isolated system

D

Any system

44

A collision in which the K.E. of the system is not conserved is called?

A

A perfectly elastic collision

B

An elastic collision

C

An inelastic collision

D

A head-on collision

45

If a squash ball returns to its starting point after several bounces, its total displacement is?

A

Maximum

B

Infinite

C

Zero

D

Negative

46

A negative acceleration means the velocity of the body is?

A

Increasing

B

Constant

C

Decreasing

D

Zero

47

The property of an object to maintain its state of rest or uniform motion is called?

A

Force

B

Momentum

C

Inertia

D

Impulse

48

When a body moves along a straight line, its displacement coincides with?

A

Its velocity

B

The path of motion

C

Its acceleration

D

Time taken

49

In an elastic collision of two bodies, the magnitude of relative velocity of approach is ______ the magnitude of relative velocity of separation.

A

greater than

B

less than

C

equal to

D

half of