Class 9 Physics · Chapter 4 · Test 2
Torque and Couples
35 MCQs
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
The turning effect of a force is called:
- APressure
- BTorque or moment of force
- CMomentum
- DPower
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Answer: B
Torque measures the turning effect of a force.
Question 2
The point about which a body turns is commonly called the:
- ACentre of mass only
- BPivot or axis of rotation
- CLine of action
- DResultant
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Answer: B
A pivot or axis is the reference about which rotation occurs.
Question 3
The line along which a force acts is called its:
- AMoment arm
- BAxis of rotation
- CLine of action
- DCentre of gravity
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Answer: C
The textbook defines the line along which the force acts as the line of action.
Question 4
Moment arm is the perpendicular distance between the line of action and the:
- ACentre of mass
- BAxis of rotation
- CEarth's centre
- DForce vector's head
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Answer: B
The moment arm is the perpendicular distance from the axis to the force's line of action.
Question 5
For a perpendicular force, torque magnitude is:
- AF/r
- BF × r
- CF + r
- Dr/F
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Answer: B
When the force is perpendicular, torque equals force times perpendicular distance.
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