If you are looking first Year Chapter Three Physics MOTION AND FORCE Chapter Wise MCQs question answers, You are here on right website all of these Multiple Choice Question answers are helpful for learning exams MCQs Questions with solutions. Learn these important Key points for upcoming board exams and tests preparations.

1st Year Physics Chapter 3 MCQs |

On this website you will learn first Year Physics Unit Three MOTION AND FORCE MCQs with solved Answers. Mostly past papers important MCQs are helpful for getting better marks. You will easily learn this chapter by learning these solved MCQs of MOTION AND FORCE.

Important Key Points You Will Learn in Chapter Three:

- Displacement
- Velocity
- Acceleration
- Newton’s Laws of Motion
- Momentum and Newton’s Second Law of Motion
- Impulse
- Law of Conservation of Momentum
- Elastic and Inelastic Collision
- Force due to Water Flow
- Momentum and Explosive Forces
- Rocket Propulsion
- Projectile Motion

Q.1: What must change when a body is accelerating?

- The mass of the body
- The velocity of the body
- The speed of the body
- The force acting on the body

B

Q.2: A body is moving with uniform velocity. Its?

- Speed changes
- Acceleration changes
- The direction of motion changes
- Displacement from origin changes

D

Q.3: A man in a car moving with a velocity 36km/hr. His speed with respect to the car is:?

- 10m/s
- 36m/s
- Zero
- Infinite

C

Q.4: When the velocity-time graph is a straight line parallel to the time axis then:?

- Acceleration is const
- Acceleration is variable
- Acceleration is zero
- Velocity is zero

C

Q.5: A body is moving in a circle at a constant speed. Which of the following statement is true about the body?

- There is no acceleration
- There is a force acting at a tangent to a circle
- There is a force acting away from the center of the circle
- There is a force acting towards the center of the circle

D

Q.6: When a person walks along East, the force of friction is along?

- East
- West
- Anywhere from east to west
- Anywhere from north to south

B

Q.7: Instantaneous and average velocities become equal when the body:?

- Has zero acceleration
- Has uniform acceleration
- Has variable acceleration
- Moves in a circle

A

Q.8: Which law of motion is called the law of inertia?

- 1
^{st}law - 2
^{nd}law - 3
^{rd}law - All 1
^{st}, 2^{nd}and 3^{rd}

A

Q.9: When a horse pulls a cart, the force that makes the horse run forward is the force exerted by?

- The horse on the ground
- The cart on the ground
- The ground on the horse
- The ground on the cart

C

Q.10: Newton’s law does not hold good for particles?

- At rest
- Moving slowly
- Move with high velocity
- Move with a velocity comparable to the velocity of light

D

Q.11: 1

^{st}law of motion gives the definition of?- Rest
- Motion
- Velocity
- Force

D

Q.12: 2

^{nd}law of motion measure which quantity?- Force
- Acceleration
- Velocity
- Both force and acceleration

A

Q.13: Imran travels 2m with speed v

_{1}and then 2m with speed v_{2}his average speed is?- v
_{1}+ v_{2}/2 - v
_{1}v_{2}/2 - v
_{1}v_{2}/v_{1}+v_{2 } - 2v
_{1}v_{2}/v_{1}+v_{2}

D

Q.14: Momentum depends upon?

- Force acts on the body
- Mass of the body
- The velocity of the body
- Both mass and velocity of the body

D

Q.15: Why does an object falling in the earth’s gravitational field reach a steady velocity?

- Air resistance increases with increasing the velocity
- The earth’s gravitational field decreases as the object falls
- The mass of the object remains constant
- The weight of the object increases as it falls

A

Q.16: When a body moves in a straight line then its displacement coincides with?

- Distance
- Force
- Acceleration
- Both a and b

A

Q.17: When two bodies stick together after the collision, the collision is said to be?

- Perfectly elastic
- Partially elastic
- Completely inelastic
- None of these

C

Q.18: Motorcycle safety helmet extends at the time of the collision and hence decreasing the?

- Change of collision
- Force acting
- Velocity
- Impulse

B

Q.19: The collision between the two bodies may be elastic if bodies are?

- Solid and soft
- Soft and elastic
- Solid and hard
- Hard and elastic

C

Q.20: At the maximum height on the trajectory which of projectile becomes zero?

- Acceleration
- Velocity
- Vertical velocity
- Horizontal velocity

C

Q.21: When the car takes turns around a curve road, the passengers feel a force acting on them in a direction away from the center of the curve. It is due to?

- Centripetal force
- Gravitational force
- Their inertia
- Centrifugal force

C

Q.22: A body is falling freely under gravity. How much distance does it fall during an interval of time between 1

^{st}and 2^{nd}seconds of its motion, taking g = 10?- 10m
- 15m
- 20m
- 25m

B

Q.23: What is the shape of the velocity-time graph for constant acceleration?

- Straight inclined line
- Parabola
- Inclined curve
- Declined curve

A

Q.24: When a collision between the bodies in 2 system is inelastic in nature than for the system?

- Momentum changes but K.E remain to conserve
- K.E changes but momentum remain to conserve
- Both momentum and K.E changes
- Both momentum and K.E remain to conserve

B

Q.25: Which shows the correct relation between time of flight T and maximum height H?

- H = gT
^{2}/8 - H = 8T
^{2}/g - H = 8g/T
^{2} - H = 8/gT
^{2}

A

Q.26: If an iron ball and wooden ball of the same radius was released from the height ‘h’ in a vacuum, then the time taken by both of them to reach the ground will be?

- Unequal
- Equal
- Zero
- None of these

B

Q.27: Taking off a rocket can be explained by?

- 1
^{st}law of motion - 2
^{nd}law of motion - Law of conservation of momentum
- Law of conservation of energy

C

Q.28: Which of the following is not an example of projectile motion?

- A gas-filled balloon
- Bullet fired from a gun
- A football kicked
- A baseball shot

A

Q.29: What is the angle of projection for which the range and maximum height become equal?

- tan
^{-1}1/4 - tan
^{-1}4 - tan
^{-1}½ - tan
^{-1}2

B

Q.30: The thrust on the rocket in the absence of gravity is?

- Constant
- Not constant
- Constant if the rate of ejected gases is constant
- Constant for short-range rocket

A

Q.31: When two bodies move towards each other with constant speeds the distance between them decreases at the rate of 6m/sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are?

- 5m/s, 1m/s
- 3m/s, 3m/s
- 6m/s, 1m/s
- 4m/s, 2m/s

A

Q.32: Distance covered by a freely falling body in 2 seconds will be?

- 4.9m
- 19.6m
- 39.2m
- 44.1m

B

Q.33: The distance covered by a body with uniform acceleration in time ‘t’ starting from rest is?

- at
^{2}/2 - Vt
- a
^{2}t/2 - Both a and b

A

Q.34: Flight of a rocket in the space is an example of?

- The second law of motion
- Third law of motion
- The first law of motion
- Law of gravitation

B

Q.35: The trajectory (or path) of a projectile flying against strong air currents is?

- Straight line
- Parabola
- Hyperbola
- Not a parabola

D

Q.36: Rocket engine lifts rocket from the earth’s surface because of hot gas with high velocity?

- React against the rocket and push it up
- Push against the air
- Push against the earth
- Heat up the air which lifts the rocket

A

Q.37: The force experienced by a wall on which water strikes normally at a speed of 10ms

^{-1}and at a discharge of 0.0001m^{3}s^{-1 }is?- 1N
- 10N
- 100N
- None

A

Q.38: The time rate of change of momentum is equal to?

- Force
- Impulse
- Velocity
- Both a and c

A

Q.39: The range of the projectile at 30° is R

_{30}and at 60° is R_{60 }then?- R
_{30}= R_{60} - R
_{30}= 2R_{60} - 2R
_{30}= R_{60} - R
_{30}= R_{60}if initial velocities are the same

D

Q.40: Why do Ballistic missiles fail in some circumstances of precision?

- Due to their shape
- Due to air resistance
- Due to the angle of projection
- All of these

B