Laws of Motion Test

Result

Laws of Motion Test - 48

Score
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Weekly Quiz Competition

Question 1
4 / -1

Newton\'s second law gives the measure of

A
Acceleration

B
Force

C
Momentum

D
Angular momentum

Solution
Question 2
4 / -1

The velocity of a body of mass 20 kg decreases from 20 m/s to 5 m/s in a distance of 100 m. Force on the body is

A
–27.5 N

B
–47.5 N

C
–37.5 N

D
–67.5 N

Solution
Question 3
4 / -1

A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes upto 2 m height further, find the magnitude of the force. Consider g = 10 m/s²

A
10 N

B
20 N

C
22 N

D
4 N

Solution
Question 4
4 / -1

A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is

A
6 N

B
8 N

C
2 N

D
4 N

Solution
Question 5
4 / -1

A body of mass 0.05 kg is observed to fall with an acceleration of 9.5 ms^–2. The opposing force of air on the body is (g = 9.8 ms^–2)

A
0.015 N

B
0.15 N

C
0.030 N

D
Zero

Solution
Question 6
4 / -1

A block of mass m is resting on a smooth horizontal surface. One end of a uniform rope of mass (m/3) is fixed to the block, which is pulled in the horizontal direction by applying a force F at the other end. The tension in the middle of the rope is

A

B

C

D

Solution
Question 7
4 / -1

A
0°

B
30°

C
45°

D
90°

Solution
Question 8
4 / -1

A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30 m W and the speed of light is 3 × 10⁸m/s.The final momentum of the object is

A
0.3 × 10^–17 kg ms^–1

B
1.0 × 10^–17 kg ms^–1

C
3.0 × 10^–17 kg ms^–1

D
9.0 × 10^–17 kg ms^–1

Solution
Question 9
4 / -1

A force of 5 N acts on a body of weight 9.8 N. What is the acceleration produced in m/s²?

A
49.00

B
5.00

C
1.46

D
0.51

Solution
Question 10
4 / -1

The engine of a car produces acceleration 4 m/s² in the car. If this car pulls another car of same mass, what will be the acceleration produced?

A
8 m/s²

B
2 m/s²

C
4 m/s²

D
1/2 m/s²

Solution