Systems of Particles and Rotational Motion Test

Result

Systems of Particles and Rotational Motion Test - 51

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Question 1
4 / -1

A constant torque of 1000 N–m, turns a wheel of moment of inertia 200 kg–m² about an axis through the centre. Angular velocity of the wheel after 3s will be

A
15 rad/s

B
10 rad/s

C
5 rad/s

D
1 rad/s

Solution
Question 2
4 / -1

What constant force, tangential to the equator should be applied to the earth to stop its rotation in one day?

A
1.3 × 10²² N

B
8.26 × 10²⁸ N

C
1.3 × 10²³ N

D
None of these

Solution
Question 3
4 / -1

The angular momentum of a wheel changes from 2L to 5L in 3 seconds. What is the magnitude of the torque acting on it?

A
L

B
L/2

C
L/3

D
L/5

Solution
Question 4
4 / -1

Very thin ring of radius R is rotated about its centre. It\'s radius will

A
Increase

B
Decrease

C
Change depends on the material

D
None of the above
Question 5
4 / -1

A
1

B
R₁/R₂

C
R₂/R₁

D
(R₁/R₂)²

Solution
Question 6
4 / -1

A horizontal force F is applied such that the block remains stationary then which of the following statement is false

A
f = mg [where f is the friction force]

B
F = N [where N is the normal force]

C
F will not produce torque

D
N will not produce torque

Solution
Question 7
4 / -1

Turning effect is produced by

A
Tangential component of force

B
Radial component of force

C
Transverse component of force

D
None of the above

Solution
Question 8
4 / -1

In the figure (i) half of the meter scale is made of wood while the other half, of steel. The wooden part is pivoted at O. A force F is applied at the end of steel part. In figure (ii) the steel part is pivoted at O and the same force is applied at the wooden end

A
More acceleration will be produced in (i)

B
More acceleration will be produced in (ii)

C
Same acceleration will be produced in both conditions

D
Information is incomplete

Solution
Question 9
4 / -1

A fly wheel of moment of inertia 3 × 10² kg–m² is rotating with uniform angular speed of 4.6 rad s^–1. If a torque of 6.9 × 10² N–m retards the wheel, then the time in which the wheel comes to rest is

A
1.5 s

B
2 s

C
0.5 s

D
1 s

Solution
Question 10
4 / -1

Torque applied on a particle is zero, then its angular momentum will be

A
Equal in direction

B
Equal in magnitude

C
Both (a) and (b)

D
Neither (a) nor (b)

Solution