Rotational motion Multiple choice questions NEET Physics

NEET Physics Rotational motion multiple choice questions in self practice tests are given with answers and solutions.

They are based on 10 + 2 syllabus. Each self practice test contains ten multiple choice questions only.

You should study the textbook lesson Rotational motion in NCERT or other books.

You must be answer the multiple choice questions in your own method. These questions were given in previous years different compitive examinations.

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Physics NEET Rotational motion Practice tests

Physics

Rotational motion

Multiple choice questions

Self Practice test 1

1) Tree objects, A : (a solid sphere), B : (a thin circular disc) and C : (a circular ring), each have the same mass M and radius R. They all spin with the same angular speed Omega about their own symmetry axes. The amount of work W required to bring them to rest, would satisfy the relation.

2) A solid sphere is rotating freely about its symmetry axis in free space. The radius of sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere ?

1. Rotational kinetic energy

2. Moment of inertia

3. Angular velocity

4. Angular momentum

3) The ratio of the accelerations for a solid sphere (mass m and radius R) rolling down an incline of angle theta without slipping and slipping down the incline without rolling is :

1. 5 : 7

2. 2 : 3

3. 2 : 5

4. 7 : 5

4) A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 m/s. It collides with a horizontal spring of force constant 200 N/m. The maximum compression produced in the spring will be :

1. 0.7 m

2. 0.2 m

3. 0.5 m

4. 0.6 m

5) The instantaneous angular position of a point on a rotating wheel is given by the equation

The torque on the wheel becomes zero at :

1. t = 1s

2. t = 0.5 s

3. t = 0.25 s

4. t = 2s

6) Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momentum will be in the ratio :

1. 1 : 2

2. √2 : 1

3. 1 : √2

4. 2 : 1

7) A round disc of moment of inertia I2 about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I1 rotating with an angular velocity Omega about the same axis. The final angular velocity of the combination of discs is :

8) A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is K. If radius of the ball will be R, then the fraction of total energy associated with its rotation energy will be :

9) The angular momentum of body remains conserve if :

1. Applied force on body is zero

2. Applied torque on body is zero

3. Applied force on body is constant

4. Apply torque on body is constant

10) In an orbital motion the angular momentum vector is

1. along the radius vector

2. parallel to the linear momentum

3. In the orbital plane

4. perpendicular to the orbital plane

Answers for self practice test 1

1. 4

2. 4

3. 1

4. 4

5. 1

6. 3

7. 2

8. 3

9. 2

10. 4

Solutions for self practice test 1

Rotational motion questions with solutions NEET Physics

Self Practice test 2

1. A solid sphere is in rolling motion. In rolling motion a body possesses translational kenetic energy (Kt) as well as rotational kinetic energy (Kr) simultaneously. The ratio K1 : (Kt + Kr) for the sphere is :

1. 10 : 7

2. 5 : 7

3. 7 : 10

4. 2 : 5

2. A disc of radius 2 m and mass 100 kg rolls on the horizontal floor, its centre of mass has speed of 20 cm/s. How much work is needed to stop it ?

1. 30 J

2. 3 J

3. 2 J

4. 1 J

3. A solid cylinder of mass 50 kg and radius 0.5 m is a free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 revolutions per square second is :

1. 157 N

2. 50 N

3. 78.5 N

4. 25 N

4. A small mass attached to a string rotates on a frictionless table top. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will :

1. Decrease by a factor of 2

2. Remain constant

3. Increase by a factor of 4

4. Increase by a factor of 2

5. A thin circular ring of mass M and radius R is rotating in a horizontal plane about an axis vertical to its plane with a constant angular velocity Omega. If two objects each of mass m be attached gently to the opposite ends of a diameter of the ring. The ring will then rotate with an angular velocity :

6. A wheel having moment of inertia 2 kg-square metre about its vertical axis, rotates at the rate of 60 rpm about the axis. The torque which can stop the wheel’s rotation in 1 minute would be :

7. The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and a circular ring of the same radius about a tangential axis in the plane of the ring is :

1. 2 : 1

2. √5 : √6

3. 2 : 3

4. 1 : √2

8. A circular disc is to be made by using iron and aluminium so that it acquired maximum moment of inertia about geometrical axis. It is possible with :

1. Aluminium at interior and iron surrounded to it.

2. Iron at a interior and aluminium surrounded to it.

3. Using iron and aluminium layers in alternate order.

4. Sheet of iron is used at both external surface and aluminium sheet as internal layer.

9. A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom :

10. A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass m is dropped at the centre and is allowed to spread out and finally fall on ground. The angular velocity during this period :

1. Decreases continuously

2. Decreases initially and increases again

3. Remains constant

4. Increases continuously

Answers for self practice test 2

1. 2

2. 2

3. 1

4. 3

5. 3

6. 2

7. 2