Systems of Particles and Rotational Motion Test

Result

Systems of Particles and Rotational Motion Test - 53

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Weekly Quiz Competition

Question 1
4 / -1

A person standing on a rotating platform has his hands lowered. He suddenly outstretch his arms. The angular momentum

A
Becomes zero

B
Increases

C
Decreases

D
Remains the same
Question 2
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
Question 3
4 / -1

What remains constant when the earth revolves around the sun?

A
Angular momentum

B
Linear momentum

C
Angular kinetic energy

D
Linear kinetic energy
Question 4
4 / -1

A circular turn table has a block of ice placed at its centre. The system rotates with an angular speed ω about an axis passing through the centre of the table. If the ice melts on its own without any evaporation, the speed of rotation of the system

A
Becomes zero

B
Remains constant at the same value ω

C
Increases to a value greater than ω

D
Decreases to a value less than ω
Question 5
4 / -1

Before jumping in water from above a swimmer bends his body to

A
Increase moment of inertia

B
Decrease moment of inertia

C
Decrease the angular momentum

D
Reduce the angular velocity
Question 6
4 / -1

A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 2 revolutions/sec about a vertical axis through the centre of the platform and straight up through the boy. He holds 2 kg masses in each of his hands close to his body. The combined moment of inertia of the system is 1 kg × m². The boy now stretches his arms so as to hold the masses of inertia of the system increases to 2 kg × m². The kinetic energy of the system in the latter case as compared with that in the previous case will

A
Remain unchanged

B
Decrease

C
Increase

D
Remain uncertain

Solution
Question 7
4 / -1

A homogeneous disc of mass 2 kg and radius 15 cm is rotating about its axis (which is fixed) with an angular velocity of 4 radian/s. The linear momentum of the disc is

A
1.2 kg–m/s

B
1.0 kg–m/s

C
0.6 kg–m/s

D
None of these

Solution
Question 8
4 / -1

If the earth is a point mass of 6 × 10²⁴ kg revolving around the sun at a distance of 1.5 × 10⁸ km and in time T = 3.14 × 10⁷s, then the angular momentum of the earth around the sun is

A
1.2 × 10¹⁸ kgm²/s

B
1.8 × 10²⁹ kgm²/s

C
1.5 × 10³⁷ kgm²/s

D
2.7 × 10⁴⁰ kgm²/s

Solution
Question 9
4 / -1

A boy comes running and sits on a rotating platform. What is conserved?

A
Linear momentum

B
Kinetic energy

C
Angular momentum

D
None of these
Question 10
4 / -1

A man turns on a rotating table with an angular speed ω. He is holding two equal masses at arm\'s length. Without moving his arms, he just drops the two masses. How will his angular speed change?

A
It will be less than ω

B
It will be more than ω

C
It will remains equal to ω

D
May be less than, greater than or equal to ω depending on the quantity of masses

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Re-Attempt Weekly Quiz Competition

Systems of Particles and Rotational Motion Test - 53

Result

Systems of Particles and Rotational Motion Test - 53

Score

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Rank

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SHARING IS CARING

Question 1

Becomes zero

Increases

Decreases

Remains the same

Question 2

Four times

Double

Half

Unchanged

Solution

Question 3

Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

Question 4

Becomes zero

Remains constant at the same value ω

Increases to a value greater than ω

Decreases to a value less than ω

Question 5

Increase moment of inertia

Decrease moment of inertia

Decrease the angular momentum

Reduce the angular velocity

Question 6

Remain unchanged

Decrease

Increase

Remain uncertain

Solution

Question 7

1.2 kg–m/s

1.0 kg–m/s

0.6 kg–m/s

None of these

Solution

Question 8

1.2 × 1018 kgm2/s

1.8 × 1029 kgm2/s

1.5 × 1037 kgm2/s

2.7 × 1040 kgm2/s

Solution

Question 9

Linear momentum

Kinetic energy

Angular momentum

None of these

Question 10

It will be less than ω

It will be more than ω

It will remains equal to ω

May be less than, greater than or equal to ω depending on the quantity of masses

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1.2 × 10¹⁸ kgm²/s

1.8 × 10²⁹ kgm²/s

1.5 × 10³⁷ kgm²/s

2.7 × 10⁴⁰ kgm²/s