Systems of Particles and Rotational Motion Test

Result

Systems of Particles and Rotational Motion Test - 26

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Question 1
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 2
4 / -1

If the angular momentum of any rotating body increases by 200%, then the increase in its kinetic energy

A
400 %

B
800 %

C
200 %

D
100 %

Solution
Question 3
4 / -1

In an orbital motion, the angular momentum vector is

A
Along the radius vector

B
Parallel to the linear momentum

C
In the orbital plane

D
Perpendicular to the orbital plane
Question 4
4 / -1

Angular momentum L of body with mass moment of inertia I and angular velocity ω rad/sec is equal to

A
I/ω

B
Iω²

C
Iω

D
None of these
Question 5
4 / -1

A solid sphere of mass 500 g and radius 10 cm rolls without slipping with the velocity 20 cm/s. The total kinetic energy of the sphere will be

A
0.014 J

B
0.028 J

C
280 J

D
140 J

Solution
Question 6
4 / -1

Ratio of total kinetic energy and rotational kinetic energy in the motion of a disc is

A
1 : 1

B
2 : 7

C
1 : 2

D
3 : 1

Solution
Question 7
4 / -1

A body of moment of inertia of 3 kg-m² rotating with an angular velocity of 2 rad/sec has the same kinetic energy as a mass of 12 kg moving with a velocity of

A
8 m/s

B
0.5 m/s

C
2 m/s

D
1 m/s

Solution
Question 8
4 / -1

The moment of inertia of a flywheel having kinetic energy 360 J and angular speed of 20 rad/s is

A
18 kg m²

B
1.8 kg m²

C
2.5 kg m²

D
9 kg m²

Solution
Question 9
4 / -1

If rotational kinetic energy is 50% of translational kinetic energy, then the body is

A
Ring

B
Cylinder

C
Hollow sphere

D
Solid sphere

Solution
Question 10
4 / -1

In the above question, find the angular speed at the bottom

A
68 rad/sec

B
8.5 rad/sec

C
17 rad/sec

D
34 rad/sec

Solution