Laws of Motion Test

Result

Laws of Motion Test - 70

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Question 1
4 / -1

When a bullet is fired at a target, its velocity decreases by half after penetrating 30 cm into it. The additional thickness it will penetrate before corning to rest is

A
30 cm

B
40 cm

C
10 cm

D
50 cm

Solution
Question 2
4 / -1

If a person with a spring balance and a body hanging from it goes up and up in an aeroplane, then the reading of the weight of the body as indicated by the spring balance will

A
Go on increasing

B
Go on decreasing

C
First increase and then decrease

D
Remain the same
Question 3
4 / -1

The time period of a simple pendulum measured inside a stationary lift isfound to be T. If the lift starts accelerating upwards with an acceleration g/3, the time period is

A

B

C

D
T / 3

Solution
Question 4
4 / -1

A ball of mass 400 gm is dropped from a height of 5 m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 100 newton so that it attains a vertical height of 20 m. The time for which the ball remains in contact with the bat is [g = 10 m/s²]

A
0.12 s

B
0.08 s

C
0.04 s

D
12 s

Solution
Question 5
4 / -1

The linear momentum p of a body moving in one dimension varies with time according to the equation p = a + bt², where a and b are positive constants. The net force acting on the body is

A
A constant

B
Proportional to t ²

C
Inversely proportional to t

D
Proportional to t

Solution
Question 6
4 / -1

A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

A
The body may necessarily change direction

B
The body is sure to slow down

C
The body will necessarily continue to move in the same direction at the same speed

D
None of the above
Question 7
4 / -1

A second\'s pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket

A
Comes down with uniform acceleration

B
Moves round the earth in a geostationary orbit

C
Moves up with a uniform velocity

D
Moves up with uniform acceleration

Solution
Question 8
4 / -1

n small balls each of mass m impinge elastically each second on a surface with velocity u. The force experienced by the surface will be

A
mnu

B
2 mnu

C
4 mnu

D
1/2mnu

Solution
Question 9
4 / -1

A

B

C
10 kg

D
20 kg

Solution
Question 10
4 / -1

A ball of mass 0.5 kg moving with a velocity of 2 m/s strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is

A
2000 N

B
1000 N

C
5000 N

D
125 N

Solution