Class 9 Physics · Chapter 4 · Test 4
Stability and Rotational Motion
Test 4: Stability, Rotational Motion and Centripetal Force
35 questions · 30 min · 35 marks
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Sample questions
The first 5 of 35. Try each one, then tap to see the answer.
Question 1
A body in stable equilibrium, when slightly tilted, tends to:
- AMove farther from its original position
- BReturn to its original position
- CRemain at a higher centre of gravity permanently
- DAccelerate without limit
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Answer: B
Stable equilibrium produces a restoring turning effect after a small disturbance.
Question 2
A body in unstable equilibrium, when slightly tilted, tends to:
- AReturn to its original position
- BMove farther from its original position
- CStay at exactly the same position
- DLose its weight
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Answer: B
A small displacement moves the body farther from its original position.
Question 3
In neutral equilibrium, a small displacement leaves the centre of mass at:
- AA higher height
- BA lower height
- CThe same height
- DAn undefined height
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Answer: C
Neutral equilibrium involves no change in centre-of-mass height after displacement.
Question 4
A cylinder rolling on a horizontal surface is an example given for:
- AStable equilibrium only
- BUnstable equilibrium only
- CNeutral equilibrium
- DNo possible equilibrium
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Answer: C
The textbook gives a cylinder on its curved surface as a neutral-equilibrium example.
Question 5
A system's stability can be improved by:
- ARaising its centre of gravity
- BLowering its centre of gravity
- CNarrowing its base in every case
- DIncreasing its height only
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Answer: B
A lower centre of gravity generally improves stability.
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