Laws of Motion Test

Result

Laws of Motion Test - 54

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Weekly Quiz Competition

Question 1
4 / -1

A shell of mass 10 kg is moving with a velocity of 10 ms^–1. When it blasts, forms two parts of mass 9 k and 1 kg respectively. If the 1st mass is stationary, thenvelocity of the 2nd is

A
1 m/s

B
10 m/s

C
100 m/s

D
1000 m/s

Solution
Question 2
4 / -1

A wagon weighing 1000 kg is moving with a velocity 50 km/hr on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is

A
25 km/hr

B
20 km/hr

C
40 km/hr

D
50 km/hr

Solution
Question 3
4 / -1

If a force of 250 N act on body, the momentum acquired is 125 kg-m/s. What is the period for which force acts on the body?

A
0.5 s

B
0.2 s

C
0.4 s

D
0.25 s

Solution
Question 4
4 / -1

A jet engine works on the principle of

A
Conservation of mass

B
Conservation of energy

C
Conservation of linear momentum

D
Conservation of angular momentum
Question 5
4 / -1

A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If velocity of exhaust gas is 1 km/s, then it lifts with an acceleration of

A
1000 ms^–2

B
100 ms^–2

C
10 ms^–2

D
1 ms^–2

Solution
Question 6
4 / -1

The momentum is most closely related to

A
Force

B
Impulse

C
Power

D
KE
Question 7
4 / -1

A body of mass m = 3.513 kg is moving along the x–axis with a speed of 5.0 ms^–1. The magnitude of itsmomentum is recorded

A
17.565 kg ms^–1

B
17.56 kg ms^–1

C
17.57 kg ms^–1

D
17.6 kg ms^–1

Solution
Question 8
4 / -1

A force of 50 dyne is acted on a body of mass 5 g which is at rest for an interval of 3 seconds, then impulse is

A
0.15 × 10^–3 Ns

B
0.98 × 10^–3 Ns

C
1.5 × 10^–3 Ns

D
2.5 × 10^–3 Ns

Solution
Question 9
4 / -1

A body of mass 1000 kg is moving horizontally with a velocity 50 m/s. A mass of 250 kg is added. Find the final velocity

A
40 m/s

B
20 m/s

C

D
50 m/s

Solution
Question 10
4 / -1

A body of mass 0.25 kg is projected with muzzle velocity 100 ms^–1 from a tank of mass 100 kg. What is the recoil velocity of the tank?

A
5 ms^–1

B
25 ms^–1

C
0.5 ms^–1

D
0.25 ms^–1

Solution