Systems of Particles and Rotational Motion Test

Result

Systems of Particles and Rotational Motion Test - 25

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Question 1
4 / -1

An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver ?

A
350 N-m

B
440 N-m

C
531 N-m

D
628 N-m

Solution
Question 2
4 / -1

A 10 kg body hangs at rest from a rope wrapped around a cylinder 0.2 m in diameter. The torque applied about the horizontal axis of the cylinder is

A
98 N-m

B
19.6 N-m

C
196 N-m

D
9.8 N-m

Solution
Question 3
4 / -1

Which is a vector quantity ?

A
Work

B
Power

C
Torque

D
Gravitational constant
Question 4
4 / -1

When a torque acting upon a system is zero, then which of the following will be constant ?

A
Force

B
Linear momentum

C
Angular momentum

D
Linear impulse

Solution
Question 5
4 / -1

The instantaneous angular position is a point on a rotating wheel is given by the equation θ(t) = 2t³ – 6t². The torque on the wheel becomes zero at

A
t = 2s

B
t = 1s

C
t = 0.2s

D
t = 0.25s

Solution
Question 6
4 / -1

A disc is rotating with an angular speed of ω. If a child sits on it, which of the following is conserved ?

A
Kinetic energy

B
Potential energy

C
Linear momentum

D
Angular momentum
Question 7
4 / -1

If the radius of the earth is suddenly contracts to half of its present value, then the duration of day will be of

A
6 hr

B
12 hr

C
18 hr

D
24 hr

Solution
Question 8
4 / -1

The moment of momentum is called

A
Couple energy

B
Torque

C
Impulse

D
Angular momentum
Question 9
4 / -1

Two bodies have their moment of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momentum will be in the ratio

A
1 : 2

B
√2 : 1

C
2 : 1

D
1 : √2

Solution
Question 10
4 / -1

The radius of a rotating disc is suddenly reduced to half without any change in its mass. Then its angular velocity will be

A
Four times

B
Double

C
Half

D
Unchanged

Solution