Laws of Motion Test

Result

Laws of Motion Test - 13

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Question 1
4 / -1

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

A
1 ms^-1

B
10 ms^-1

C
100 ms^-1

D
1000 ms^-1

Solution
Question 2
4 / -1

A rocket of mass 100 kg burns 0.1 kg of fuel per second. If velocity of exhaust gas is 1 kms^-1 , 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 3
4 / -1

A bullet of mass 10 g moving with 300 ms^-1 hits a block of ice of mass 5 kg and drops dead. The velocity of ice is

A
50 cm/s

B
60 cm/s

C
40 cm/s

D
200 cm/s

Solution
Question 4
4 / -1

A unidirectional force F varying with time t as shown in the figure acts on a body initially at rest for a short duration 2T. Then, the velocity acquired by the body is

A

B

C

D
zero
Question 5
4 / -1

A machine gun fires a bullet of mass 40 g with a velocity 1200 ms^-1. The man holding it can exert a maximum force of 144 N on the gun. How many bullets can be fired per second at the most?

A
Only one

B
Three

C
Can fire any number of bullets

D
144 × 48

Solution
Question 6
4 / -1

At a certain instant of time, the mass of rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (take, g =10 m/s²)

A
20 m/s²

B
10 m/s²

C
2 m/s²

D
1 m/s²

Solution
Question 7
4 / -1

A body of mass 1000 kg is moving horizontally with a velocity 50 ms^-1. A mass of 250 kg is added. Find the final velocity.

A
40 ms^-1

B
23 ms^-1

C
12 ms^-1

D
32.5 ms^-1

Solution
Question 8
4 / -1

A gun fires bullets each of mass lg with velocity of 10 ms^-1 by exerting a constant force of 5 g weight. Then, the number of bullets fired per second is (take, g =10 ms^-2)

A
50

B
5

C
10

D
25

Solution
Question 9
4 / -1

A gun fires N bullets per sec, each of mass m with velocity v. The force exerted by the bullets on the gun is

A

B

C

D

Solution
Question 10
4 / -1

The rate of mass of the gas emitted from rear of a rocket is initially 0.1 kgs^-1. If the speed of the gas relative to the rocket is 50 ms^-1 and mass of the rocket is 2 kg, then the acceleration of the rocket (in ms^-2) is

A
5

B
5.2

C
2.5

D
25

Solution