Force and Motion 40+ Recall Based MCQs – Wisegot

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  1. The range of the projectile at 30 deg and 60 deg are__________________

A. equal to 45 deg
B. equal to 90 deg
C. equal to each other
D. none of the above

2. The force beared by a wall on which water strikes normally at a speed of 10m/sec and at a discharge of 0.0001m3/sec is__________________?

A. 1 N
B. 10 N
C. 100 N
D. none

3. The trajectory (or path) of a projectile is_________________?

A. straight line
B. parabola
C. hyperbola
D. circle

4 The distance covered by a body in time t starting from rest is__________________?

A. at2/2
B. Vt
C. a2t/2
D. at2

5 When two bodies move toward 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________________?

A. 5m/s, 1m/s
B. 3m/s, 3m/s
C. 6m/s, 1m/s
D. 4m/s, 2m/s

6 The thrust on the rocket in the absence of gravitational force of attraction is__________________?

A. Constant
B. not constant
C. constant if the rate of ejected gases is constant
D. constant for short range rocket.

7 Which of the following is not an example of projectile motion ?

A. a gas filled ballon
B. bullet fired from gun
C. a football kicked
D. a base ball shot

8 The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?

A. -1
B. 1
C. 2
D. -2

9 When collision between the bodies in a system is inelastic in nature then for system ____________________?

A. momentum changes but K.E remain conserve
B. K.E changes but momentum remain conserve
C. both momentum and K.E changes
D. both momentum and K.E remain conserve

10 A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?

A. 14 m
B. 20 m
C. 5 m
D. 25 m

11 During long jump, athlete runs before taking the jump. By doing so he__________________?

A. provide him a larger inertia
B. decreases his inertia
C. decreases his momentum
D. increases his momentum

12 Motorcycle safety helmet extends the time of collision hence decreasing the________________?

A. chance of collision
B. force acting
C. velocity
D. impulse

13 When a body moves in a straight line then its displacement coincides with__________________?

A. distance
B. force
C. acceleration is zero
D. both A and B

14 Momentum depends upon__________________?

A. force acts on the body
B. mass of the body
C. velocity of the body
D. both mass and velocity of the body

15 2nd law of motion gives the definition of________________?

A. force
B. acceleration
C. velocity
D. both force and acceleration

16 Newtons laws do not hold good for particles_______________?

A. at rest
B. moving slowly
C. move with high velocity
D. move with velocity comparable to velocity of light

17 Which law of motion is also called law of inertia ?

A. 1st law
B. 2nd law
C. 3rd law
D. all 1st, 2nd and 3rd laws

18 Slope of velocity time graph is_____________________?

A. acceleration
B. distance
C. force
D. momentum

19 When velocity time graph is a straight line parallel to time axis then__________________?

A. acceleration is const
B. acceleration is variable
C. acceleration is zero
D. velocity is zero

20 A body is moving with uniform velocity. Its______________________?

A. speed changes
B. acceleration changes
C. direction of motion changes
D. displacement from origin changes

21 Why Ballistic missile fails in some circumstances of precision ?

A. due to their shape
B. due to air resistance
C. due to angle of projection
D. all of these

22 Time rate of change of momentum is equal to____________________?

A. force
B. impulse
C. velocity
D. both A and C

23 At which angle the range of the projectile is maximum____________________?

A. 45
B. 60
C. 30
D. none

24 Flight of a rocket in the space is an example of______________________?

A. second law of motion
B. third law of motion
C. first law of motion
D. law of gravitation

25 Distance covered by a freely falling body in 2 seconds will be__________________?

A. 4.9 m
B. 19.6 m
C. 39.2 m
D. 44.1 m

26 What is the angle of projection for which the range and maximum height become equal ?

A. tan-1 ¼
B. tan-1 4
C. tan-1 ½
D. tan-1 2

27 Taking off rocket can be explained by __________________?

A. 1st law of motion
B. 2nd law of motion
C. Law of conservation of momentum
D. law of conservation of energy

28 Which shows the correct relation between time of flight T and maximum height H ?

A. H=gT2/8
B. H=8T2/g
C. H=8g/T2
D. H=gT2

29 What is the shape of velocity, time graph for constant acceleration ?

A. straight inclined line.
B. parabola
C. inclined curve
D. declined curve

30 When car takes turn 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__________________?

A. Centripetal force
B. Gravitational force
C. Their inertia
D. Centrifugal force

31 The collision between two bodies be elastic if bodies are_________________?

A. solid and soft
B. soft and elastic
C. solid and hard
D. hard and elastic

32 Which of the following pair has same direction always ?

A. force, displacement
B. force, velocity
C. force, acceleration
D. force, momentum

33 The dimension of force is____________________?

A. MLT-2
B. ML2T-2
C. ML2T2
D. ML-2T-2

34 3rd law of motion explains______________________?

A. effect of force
B. existence of a force
C. existence of two forces
D. existence of pair of forces in nature

1st law of motion gives the definition of _________________________?

A. rest
B. motion
C. velocity
D. force

Inertia of an object is quantitative measure of its__________________?

A. volume
B. density
C. mass
D. temperature

Instantaneous and average velocities become equal when body___________________?

A. has zero acceleration
B. has uniform acceleration
C. has variable acceleration
D. moves in a circle

Area under velocity time graph represent_____________________?

A. force
B. displacement
C. distance
D. acceleration

A man is in a car is moving with velocity of 36km/hr. His speed with repect to the car is ____________________?

A. 10m/s
B. 36m/s
C. zero
D. infinite

When body is in motion, ____________ always changes?

A. its velocity
B. its acceleration
C. its position vector
D. its momentum