 # Motion of Systems of Particles and Rigid Body MCQs

### Motion of Systems of Particles and Rigid Body MCQs NEET

The idea of motion of a system of particles and rigid body forms an essential part in NEET Physics syllabus. As the chapter consists of various concepts and numerical, students often feel tensed about what kind of questions will come in the exam from this part.

So, here you can take a look at the following motion of systems of particles and rigid body MCQ to get an idea of the questions you can expect in NEET.

### Crucial MCQs

1. A uniform rod having length L passes across a mass's centre. Find its gyration radius.

a) L / root over three b) L / root over two c) L / two root over three d) L2 / twelve

2. If the linear momentum is increased by 50%, kinetic energy will increase by what percent.

a) 25 % b) 50 % c) 100 % d) 125 %

3. What does a couple produce?

a) pure rotation b) rotation and translation c) no motion d) pure translation

4. Maintaining constant velocity, a particle is travelling down a line which is parallel to X-axis (positive). What will be the angular momentum magnitude with regards to origin?

a) zero b) increasing along with x c) decreasing along with x d) remains constant

5. A rope coils an empty cylinder whose mass and radius are 3 kg and 40 cm respectively. Determine the cylinder's angular acceleration if someone pulls the rope with 30 N force.

a) 0.25 rad s-2 b) 25 rad s-2 c) 5 m s-2 d) 25 m s-2

6. A closed vessel of cylindrical shape is partly filled with water. What happens to the moment of inertia if the vessel rotates along a horizontal plane around perpendicular bisector?

a) increases b) decreases c) stays constant d) depends on rotation direction

7. One rigid body having angular momentum L is rotating, and its K.E (kinetic energy) is divided into two parts. What will be its angular momentum then?

a) L b) L2 c) 2 L d) L / 2

8. A particle is in UCM (uniform circular motion). Its angular momentum remains intact about:

a) middle point of circle b) at any point within the circle c) circumference point of the circle d) at any point exterior to the circle.

9. An object round in shape having radius R and mass M rolls down by an inclined surface but does not slip. Its frictional force:

a) vanishes K.E as heat b) reduces rotational motion c) changes translational energy to rotational energy d) reduces both translational and rotational motion.

10. What will be a body's angular momentum if the time period is doubled and its moment of inertia is kept constant?

a) remain constant d) become half c) doubles d) quadruples

11. L2 / 2 I expresses:

a) rotational K.E of a body d) P.E of a body c) torque d) power

12. Find the moment of inertia if 2000Nm torque is acting on a body with 2 rad/ s2 angular acceleration.

a) 1200 kgm2 b) 900 kgm2 c) 1000 kgm2 d) Cannot be determined

13. If an object's angular velocity is increased by 10 per cent, then K.E must be increased by what percentage?

a) 40 % b) 20 % c) 10 % d) 21 %

14. What is angular momentum?

a) a scalar b) scalar as well as vector c) a polar vector d) an axial vector

15. Choose the wrong relation to the following options.

a) T = I x α

b) F = m x a

c) L = I x ω

d) I = T x α

16. Two discs A and B circular in shape have a uniform thickness and similar masses. But the density of disc 1 is greater than disc 2. What is the moment of inertia?

a) I1 > I2 b) I1 >> I2 c) I1 < I2 d) I1 = I2

17. Calculate the angular momentum of a body when it's K.E and M.I are 4 joules and 2 kg m2 respectively.

a) 4 kg m2 / sec b) 5 kg m2 / sec c) 6 kg m2 / sec d) 7 kg m2 / sec

18. On which of the following options does M.I depend?

a) particle distribution b) mass c) axis of rotation position d) all of these

19. A disc having diameter 2 m and mass 2 kg undergoes rotational motion. Consider the rotation of disc is from 300 to 600 rpm. Evaluate the work done.

a) 1479 J b) 14.79 J c) 147.9 J d) 1.479 J

20. Suppose a gymnast is sitting on a rotating chair and his arms are outstretched. If he suddenly shortens his arms, what will happen?

a) angular velocity will decrease b) moment of inertia will decrease c) angular velocity will stay constant d) angular momentum will increase.

## You Can Tally With the Answers Provided in the Following Table.

 Ques 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Ans. c d a d b a d a c d Ques 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Ans. a d d d d c a d a b

In order to get admission in one of the renowned institutes, you must score remarkably in NEET. So, you will have to put your best effort as NEET is not an easy entrance exam. Make the best use of the last few weeks by revising each chapter thoroughly.

Regarding the motion of the system of particles and rigid body, it is observed that questions get repeated from this chapter. So, preparing from a system of particles and rotational motion previous year questions NEET is a must.

Also, provide yourself short breaks and do not forget to take care of your health.