Systems of Particles and Rotational Motion Test

Result

Systems of Particles and Rotational Motion Test - 50

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Question 1
4 / -1

A
ω = 0

B
α = 0

C
J = 0

D
F = 0

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

A constant torque acting on a uniform circular wheel changes its angular momentum from A₀ to 4A₀ in 4 seconds. The magnitude of this torque is

A

B

C

D

Solution
Question 5
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 6
4 / -1

A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distant from the hinges for opening or closing the door is

A
1.2 N

B
3.6 N

C
2.4 N

D
4 N

Solution
Question 7
4 / -1

A wheel of radius 0.4 m can rotate freely about its axis as shown in the figure. A string is wrapped over its rim and a mass of 4 kg is hung. An angular acceleration of 8 rad–s^–2 is produced in it due to the torque. Then, moment of inertia of the wheel is (g = 10 ms^–2)

A
2 kg–m²

B
1 kg–m²

C
4 kg–m²

D
8 kg–m²

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

A disc of moment of inertia 5 kg–m² is acted upon by a constant torque of 40 N–m. Starting from rest the time taken by it to acquire an angular velocity of 24 rad/sec is

A
3 sec

B
4 sec

C
2.5 sec

D
120 sec

Solution
Question 10
4 / -1

A
Zero

B

C

D

Solution