# 9th class physics chapter 7 mcqs

## MCQ Questions for Class 11 Physics Chapter 7 System of Particles and Rotational Motion with Answers

Check the below NCERT MCQ Questions for Class 11 Physics Chapter 7 System of Particles and Rotational Motion with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. We have Provided System of Particles and Rotational Motion Class 11 Physics MCQs Questions with Answers to help students understand the concept very well.

### Class 11 Physics Chapter 7 MCQ Online Test

You can refer to NCERT Solutions for Class 11 Physics Chapter 7 System of Particles and Rotational Motion to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

### System of Particles and Rotational Motion Class 11 Physics MCQ online test

 Q1. A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is A.L/2 B.L/4 C.2 L D.4 L

Ans: L/4

 Q2. A car is moving with a speed of 108 km/hr on a circular path of radius 500 m. Its speed is increasing at the rate of 2 m/s. What is the acceleration of the car? A.9.8 m/s² B.2.7 m/s² C.3.6 m/s² D.1.8 m/s²

Ans: 2.7 m/s²

 Q3. The moment of inertia of uniform circular disc about an axis passing its centre is 6kgm². its M.I. about an axis perpendicular to its plane and just touching the rim will be A.18 kg m² B.30 kg m² C.15 kg m² D.3 kg m²

Ans: 18 kg m²

 Q4. A particl undergoes uniform circular motion. About which point on the plane of the circle will the angular momentum of the particle remain conserved? A.centre of the circle B.on the circumference of the corcle C.inside the circle D.outside the circle

Ans: centre of the circle

 Q5. Two particles A and B, initially at rest, moves towards each other under a mutual force of attraction. At the instant when the speed of A is u and the speed of B is 2 u, the speed of centre of mass is, A.Zero B.u C.1.5 u D.3 u

Ans: Zero

 Q6. The moment of inertia of a body about a given axis is 1.2 kg metre². Initially, the body is at rest. In order to produce a rotating kinetic energy of 1500 joules, an angular acceleration of 25 radian/sec² must be applied about that axis for a duration of A.4 sec B.2 sec C.8 sec D.10 sec

Ans: 2 sec

 Q7. Two discs has same mass rotates about the same axes. r1 and r2 are densities of two bodies (r1 > r2) then what is the relation between l1 and A.l2. B.l1 > l2 C.l1 < l2 D.l1 = l2

Ans: l1 > l2

 Q8. The kinetic energy of a body is 4 joule and its moment of inertia is 2 kg m² then angular momentum is A.4 kg m²/sec B.5 kg m²/sec C.6 kg m²/sec D.7 kg m²/sec

Ans: 4 kg m²/sec

 Q9. A mass is revolving in a circle which is in the plane of the paper. The direction of angular acceleration is A.Upward to the radius B.Towards the radius C.Tangential D.At right angle to angular velocity

Ans: Tangential

 Q10. By keeping moment of inertia of a body constant, if we double the time period, then angular momentum of body A.Remains constant B.Becomes half C.Doubles D.Quadruples

Ans: Becomes half

 Q11. If a horizontal cylindrical tube, partly filled with water is rapidly rotated about a vertical axis passing through its centre, the moment of inertia of the water about its axis will A.Decrease B.Increase C.Not change D.Increase or decrease depending upon clock wise or anticlockwise sense of rotation

Ans: Increase

 Q12. The moment of inertia of a copper disc, rotating about an axis passing through its centre and perpendicular to its plane A.Increases f its temperature is increased B.Changes if its axis of rotation is changed C.Increases if its angular velocity is increased D.Both (a) and (b) are correct

Ans: Both (a) and (b) are correct

 Q13. The kinetic energy of a body is 4 joule and its moment of inertia is 2 kg m² then angular momentum is A.4 kg m²/sec B.5 kg m²/sec C.6 kg m²/sec D.7 kg m²/sec

Ans: 4 kg m²/sec

 Q14. The total energy of rolling ring of mass m and radius R A.3/2 mv² B.1/2 mv² C.mv² D.5/2 mv²

Ans: mv²

 Q15. Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionalless horizontal surface . An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is A.30 m/s B.20 m/s C.10 m/s D.5 m/s

Ans: 10 m/s

 Q16. A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is A.2 K B.K/2 C.K/4 D.4 K

Ans: K/2

 Q17. Angular momentum is A.A scalar B.A polar vector C.A scalar as well as vector D.An axial vector

Ans: An axial vector

 Q18. A particle of mass m is moving with a constant velocity along a line parallel to the +ve direction of the X-axis. The magnitude of its angular momentum w.r.t the origin A.Is zero B.Goes on increasing as x is increased C.Goes on decreasing as x is increased D.Remains constant for all positions of the particle

Ans: Remains constant for all positions of the particle

 Q19. A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected? A.Moment of inertia B.Angular momentum C.Angular velocity D.Rotational kinetic energy

Ans: Angular momentum

 Q20. Two circular discs A and B have equal masses and uniform thickness but have densities r1 and r2 such that r1 > r2. their moment of inertia is A.l1 > l2 B.l1 >> l2 C.l1 < l2 D.l1 = l2

Ans: l1 < l2

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If ‘m’ is a mass of a body and ‘c’ is its specific heat, then its heat capacity is a given by

m/c

c/m

mc

mc2

Normal human body temperature is

15oC

37oC

37oF

98.6oC

Density of water in kgm-3 is:

1000

4200

4300

4500

The freezing point of Mercury is:

49 oC

-49oC

39oC

-39oC

The temperature of sun surface is:

5000°C

4000°C

6000°C

7000°C

If a liquid of mass ‘m’ requires thermal energy ‘ΔQv’ to completely change into gas at its boiling point without any change in its temperature, then its latent heat of vapourization can be calculated as following:

Hv = m/ΔQv

Hv = mΔQv

Hv = cmΔQv

Hv =ΔQv/m

Gallium (element) melts at:

40 °C

30 °C

80 °C

90 °C

In kelvin scale, lower reference point is:

273 K

373 K

180 K

100 K

Density of water is:

100 kgm-3

1000 kgm-3

10 kgm-3

1 kgm-3

Which of the follow material has large specific heat?

Copper

Ice

Water

Mercury

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## Federal Board Class 9th Physics Chapter No 7 Test Online MCQs and Short Question Answers

Given below is the Federal Board of Intermediate and Secondary Education (FBISE) 9th class Physics chapter No. 7 Online Test. All students who are going to appear in the annual 9th class examination organized by the FBISE, can attempt this Physics book Chapter no. 7 online test in order to evaluate their current level of preparation and highlight the areas that require your further attention. The online preparation tests of all other 9th class subjects and their respective chapters are available on our website, so students who want to achieve higher grades in their annual examination must attempt these tests as they are very useful.

### Federal Board Class 9th Physics Chapter No 7 Test Online MCQs and Short Question Answers

This quiz must be completed in 30 minutes.

1800

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## Chapter 9th mcqs 7 physics class

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Physics:Class:9-10 -Chapter:7 mcq part#1

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How can I go home in such darkness. " - Masha exclaimed, and Roman invited her to stay overnight with him. When they went to bed, the novel was in the matrimonial bed, and Masha was on the couch, she immediately began to lie that she was cold. And scared and, without permission from the guy, climbed under the covers to him.

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