Systems of Particles and Rotational Motion Test

Result

Systems of Particles and Rotational Motion Test - 54

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Question 1
4 / -1

A small object of mass m is attached to a light string which passes through a hollow tube. The tube is hold by one hand and the string by the other. The object is set into rotation in a circle of radius R and velocity v. The string is then pulled down, shortening the radius of path of r. What is conserved?

A
Angular momentum

B
Linear momentum

C
Kinetic energy

D
None of these
Question 2
4 / -1

A swimmer while jumping into water from a height easily forms a loop in the air, if

A
He pulls his arms and legs in

B
He spreads his arms and legs

C
He keeps himself straight

D
None of the above
Question 3
4 / -1

A ring of mass 10 kg and diameter 0.4 m is rotated about its axis. If it makes 2100 revolutions per minute, then its angular momentum will be

A
44 kg × m²/s

B
88 kg × m²/s

C
4.4 kg × m²/s

D
0.4 kg × m²/s

Solution
Question 4
4 / -1

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected

A
Moment of inertia

B
Angular momentum

C
Angular velocity

D
Rotational kinetic energy
Question 5
4 / -1

Angular momentum of the particle rotating with a central force is constant due to

A
Constant forces

B
Constant linear momentum

C
Zero torque

D
Constant torque
Question 6
4 / -1

Calculate the angular momentum of a body whose rotational energy is 10 joule. If the angular momentum vector coincides with the axis of rotation and its moment of inertia about this axis is 8 × 10^–7 kg/m²

A
4 × 10^–3 kg m²/s

B
2 × 10^–3 kg m²/s

C
6 × 10^–2 kg m²/s

D
None of the above

Solution
Question 7
4 / -1

If the earth is treated as a sphere of radius R and mass M. Its angular momentum about the axis of rotation with period T is

A

B

C

D

Solution
Question 8
4 / -1

If the polar ice caps melt suddenly

A
The length of day will be more than 24 hours

B
The length of the day will less than 24 hours

C
The length of the day will remain same as 24 hours

D
The length of the day will become more than 24 hours initially and then becomes equal to 24 hours

Solution
Question 9
4 / -1

A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach other end. During the journey of the insect, then angular speed of the disc

A
Remains unchanged

B
Continuously decreases

C
Continuously increases

D
First increases and then decreases

Solution
Question 10
4 / -1

A body moves with constant velocity v is a straight line parallel to x–axis. The angular momentum with respect to origin is

A
Zero

B
Constant

C
Continuously increases

D
Continuously decrease