physics MCQs - 11th class Chapter 05 Mcqs

1

The SI unit of angular displacement is?

A

Degree

B

Revolution

C

Radian

D

Meter

2

One revolution is equal to how many radians?

A

π rad

B

2π rad

C

π/2 rad

D

4π rad

3

The rate of change of angular displacement is known as?

A

Angular acceleration

B

Linear velocity

C

Angular velocity

D

Tangential acceleration

4

The direction of angular velocity is determined by the?

A

Left-hand rule

B

Right-hand rule

C

Newton's first law

D

Law of conservation of momentum

5

The SI unit for angular velocity is?

A

revolutions per minute

B

degrees per second

C

meters per second

D

radians per second

6

The rate of change of angular velocity is called?

A

Tangential acceleration

B

Centripetal acceleration

C

Angular acceleration

D

Linear acceleration

7

What is the relationship between tangential velocity (v) and angular velocity (ω) for an object moving in a circle of radius r?

A

v = ω/r

B

v = r/ω

C

v = rω

D

v = r²ω

8

What is the relationship between tangential acceleration (a_t) and angular acceleration (α)?

A

a_t = α/r

B

a_t = r/α

C

a_t = rα

D

a_t = r²α

9

The force required to keep an object moving in a circular path is called?

A

Gravitational force

B

Frictional force

C

Centripetal force

D

Centrifugal force

10

The formula for centripetal force (Fc) is?

A

Fc = mv/r

B

Fc = mvr²

C

Fc = mv²/r

D

Fc = m²v/r

11

The centripetal acceleration (a_c) is directed towards?

A

The tangent of the circle

B

The center of the circle

C

Away from the center of the circle

D

The direction of motion

12

The formula for centripetal acceleration (a_c) in terms of angular velocity (ω) is?

A

a_c = rω

B

a_c = r²ω

C

a_c = rω²

D

a_c = ω/r

13

What plays the same role in angular motion as mass plays in linear motion?

A

Torque

B

Angular momentum

C

Moment of inertia

D

Angular velocity

14

The moment of inertia (I) of a body depends on its mass and the?

A

Distribution of mass from the axis of rotation

B

Angular velocity

C

Tangential velocity

D

Shape only

15

What is the rotational analogue of Newton's second law (F=ma)?

A

F = Iα

B

τ = Iω

C

τ = Iα

D

L = Iω

16

Angular momentum (L) is defined as?

A

L = Iα

B

L = Iω

C

L = I/ω

D

L = ω/I

17

The law of conservation of angular momentum states that if no external torque acts on a system, the total angular momentum?

A

Increases

B

Decreases

C

Remains constant

D

Becomes zero

18

A diver pulls in their arms and legs during a dive to?

A

Decrease their angular velocity

B

Increase their moment of inertia

C

Increase their angular velocity

D

Decrease their angular momentum

19

The formula for rotational kinetic energy is?

A

K.E_rot = (1/2)Iω

B

K.E_rot = (1/2)I²ω

C

K.E_rot = (1/2)Iω²

D

K.E_rot = Iω²

20

For a disc of mass m and radius r, the moment of inertia is?

A

I = mr²

B

I = (1/2)mr²

C

I = (2/5)mr²

D

I = (1/12)mL²

21

For a hoop of mass m and radius r, the moment of inertia is?

A

I = mr²

B

I = (1/2)mr²

C

I = (2/5)mr²

D

I = mr

22

When a disc and a hoop roll down an inclined plane, which one reaches the bottom first?

A

The hoop

B

The disc

C

They reach at the same time

D

Depends on their mass

23

The minimum velocity required to put a satellite into orbit is called?

A

Escape velocity

B

Terminal velocity

C

Orbital velocity

D

Critical velocity

24

Objects in a freely falling satellite appear weightless because?

A

They are far from Earth's gravity

B

The satellite and objects are accelerating towards Earth at the same rate

C

There is no gravity in space

D

The satellite shields them from gravity

25

The orbital velocity (v) of a satellite at a distance r from the center of Earth (mass M) is given by?

A

v = √(GM/r²)

B

v = √(GMr)

C

v = √(GM/r)

D

v = GM/r

26

A geostationary satellite completes one orbit around the Earth in?

A

84 minutes

B

12 hours

C

24 hours

D

365 days

27

To create artificial gravity in a spaceship, the ship must?

A

Accelerate linearly

B

Rotate around its own axis

C

Travel at the speed of light

D

Be very massive

28

According to Einstein's theory, gravity is the result of?

A

A force between masses

B

The curvature of space-time

C

An intrinsic property of matter

D

Electromagnetic forces

29

Einstein's theory of gravitation predicts that light can be bent by a gravitational field. This was confirmed during a?

A

Lunar eclipse

B

Solar eclipse

C

Meteor shower

D

Supernova explosion

30

If a particle moves from position OP1 to OP2 in time Δt, making an angle Δθ, what is Δθ called?

A

Angular speed

B

Angular displacement

C

Angular acceleration

D

Linear displacement

31

One radian is approximately equal to?

A

90°

B

180°

C

57.3°

D

45°

32

The tangential acceleration (a_t) is responsible for changing the?

A

Direction of velocity

B

Magnitude of velocity

C

Angular velocity

D

Centripetal force

33

What is the angular momentum L of a particle of mass m moving with momentum p at position vector r?

A

L = r . p

B

L = p x r

C

L = r x p

D

L = m(r x p)

34

The SI unit of angular momentum is?

A

kg m/s

B

N m

C

Joule

D

J s

35

If the tension in a string swinging a ball in a vertical circle is zero at the top, the centripetal force is provided by?

A

Tension only

B

Weight only

C

Tension and weight

D

Air resistance

36

The moment of inertia of a thin rod of length L about an axis through its center is?

A

I = (1/2)mL²

B

I = mL²

C

I = (1/12)mL²

D

I = (2/5)mL²

37

The total kinetic energy of a rolling object is the sum of its translational and?

A

Potential energy

B

Rotational kinetic energy

C

Elastic energy

D

Chemical energy

38

The period T of a low-flying Earth satellite is approximately?

A

24 hours

B

84 minutes

C

90 seconds

D

365 days

39

The real weight of an object is the?

A

Reading on a spring balance

B

Gravitational pull of the Earth on the object

C

Apparent weight in a lift

D

Force required to stop it from falling

40

In a lift moving upwards with an acceleration 'a', the apparent weight of a person of mass 'm' is?

A

w - ma

B

w + ma

C

w

D

ma

41

In a lift moving downwards with an acceleration 'a', the apparent weight T is given by?

A

T = w + ma

B

T = ma - w

C

T = w - ma

D

T = w

42

A satellite in a geostationary orbit remains over the same point on the?

A

Tropic of Cancer

B

Prime Meridian

C

Equator

D

North Pole

43

The height of a geostationary satellite above the Earth's equator is approximately?

A

6400 km

B

400 km

C

36000 km

D

42300 km

44

How many geostationary satellites are needed to cover the entire populated Earth for communication?

A

1

B

2

C

3

D

10

45

The orbital radius of a geostationary satellite depends on the mass of the Earth, G, and?

A

The mass of the satellite

B

The period of revolution (one day)

C

The radius of the satellite

D

The surface temperature of the Earth

46

Newton's view of gravitation describes it as an intrinsic property of?

A

Space-time

B

Energy

C

Light

D

Matter

47

According to Einstein, objects and light rays move along what in curved space-time?

A

Straight lines

B

Geodesics

C

Ellipses

D

Parabolas

48

When a spinning skater pulls her arms in, her angular velocity increases because?

A

Her angular momentum increases

B

Her mass decreases

C

Her moment of inertia decreases

D

Her kinetic energy decreases

49

The linear velocity of a point on the rim of a rotating wheel is also known as?

A

Angular velocity

B

Centripetal velocity

C

Tangential velocity

D

Relative velocity

50

If a wheel turns through an angle θ, it lays out a tangential distance 's' given by?

A

s = r/θ

B

s = rθ²

C

s = r²θ

D

s = rθ