MCQ Class 11 Physics Chapter 6 System Of Particles & Rotational Motion

MCQ’s For All Chapters – Physics Class 11th

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. There are two objects of masses 1 kg and 2 kg located at (1, 2) and (-1, 3) respectively. The coordinates of the centre of mass are

A

B

C

D

Question 1 of 20

2. The motion of a potter's wheel is an example of

rolling motion

rotatory motion

translatory motion

precessional motion

Question 2 of 20

3. The general motion of a rigid body consists of

translational motion only

rotational motion only

both, translational and rotational motion

does not include translational and rotational motions

Question 3 of 20

4. A rigid body is one

the sum of distances of all particles from the axis remains constant

in which the distance between all pairs of particles remains fixed.

whose centre of mass follows a parabolic path

that deforms and comes back to its original shape after getting deformed

Question 4 of 20

5. If a shell at rest explodes, then, the centre of mass of the fragments

remains at rest.

Moves along a parabolic path.

Moves along a straight line.

moves along an elliptical path.

Question 5 of 20

6. A child sits stationary at one end of long trolley moving uniformly with speed v on a smooth horizontal floor. If the child gets up and runs about on the trolley in the forward direction with speed u. The centre of mass of the system (child + trolley) will move with speed

v

zero

u + v

v / u

Question 6 of 20

7. There are some passengers inside a stationary railway compartment. The centre of masses of the compartment itself(without the passengers) is C1, while the centre of mass of the compartment plus passengers' system is C2. if the passengers moves about inside the compartment

both C1 and C2 will move with respect to the ground

neither C1 nor C2 will move with respect to the ground

C1 will move but C2 will be stationary with respect to the ground.

C2 will move but C1 will be stationary with respect to the ground.

Question 7 of 20

8. If a man of mass M jumps to the ground from height h and his centre of mass moves a distance x in the time taken by him to hit the ground, the average force acting on him is (assuming his retardation to be constant during his impact with the ground)

A

B

C

D

Question 8 of 20

9. The centre of mass of a body is located

outside the system

inside or outside the system

inside the system

at the centre of system

Question 9 of 20

10. When a shell was following a parabolic path in the air, it explodes somewhere in its flight. The centre of mass of fragments will continue to move in

any direction

horizontal direction

same parabolic path.

vertical direction

Question 10 of 20

11. If the resultant of all external forces is zero, then velocity of centre of mass will be

maximum

zero

constant

minimum

Question 11 of 20

12. Every point in a rotating rigid body has the same __________at any instant of time.

linear velocity

angular velocity

displacement

linear momentum

Question 12 of 20

13. An isolated particle of mass m is moving in a horizontal plane (x,y) along the x axis at a certain height above the ground. It suddenly explodes into two fragments of masses m/4 and 3m/4. An instant later, the smaller fragments is at y = +15 cm. The larger fragment at this instant is at

y = +5 cm

y = +20 cm

y = -20 cm

y = -5 cm

Question 13 of 20

14. The centre of mass of a system of particles does not depend on

masses of the particles

forces on the particles.

relative distances between the particles.

position of the particles.

Question 14 of 20

15. If the net force acting on the system of particles is zero, then which of the following may vary

moment of inertia

Kinetic energy of the system

velocity of centre of mass

position of centre of mass

Question 15 of 20

16. If three balls of same radius are placed touching each other on a horizontal surface such that they will form an equilateral triangle, when their centers are joined. What will be the position of the centre of mass of the system?

At the point of intersection of the medians.

At the line joining the centers of any two balls.

At the centre of one of the ball.

At the horizontal surface.

Question 16 of 20

17. When external forces acting on a body are zero, then its centre of mass

remains stationary

moves with uniform velocity

either remains stationary or moves with uniform velocity

none of these

Question 17 of 20

18. Two blocks of the masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block. The velocity of centre of mass is

10 m/s

5 m/s

5 m/s

20 m/s

Question 18 of 20

19. The sum of moments of masses of all the particles in a system about the centre of mass is always:

maximum

zero

infinite

minimum

Question 19 of 20

20. In a CO molecule, the distance between carbon and oxygen molecule is 0.12 nm. What is the distance of centre of mass from the carbon atom?

0.08 nm

0.07 nm

0.05 nm

0.02 nm

Question 20 of 20

 Loading...