1. What is the SI unit of torque?
A.
Newton
B.
Newton metre
C.
Joule per metre
D.
Kilogram metre
Correct Answer:
Newton metre
Explanation:
The SI unit of torque is newton metre (N m), obtained by multiplying force in newtons by perpendicular distance in metres.
2. Which symbol represents the SI unit of torque?
A.
N
B.
J
C.
N m
D.
Pa
Correct Answer:
N m
Explanation:
Torque is measured in newton metre, written as N m, because torque equals force multiplied by perpendicular distance.
3. A force of 1 newton acting at a perpendicular distance of 1 metre produces a torque of:
A.
1 N
B.
1 m
C.
1 N m
D.
1 N/m
Correct Answer:
1 N m
Explanation:
Torque is force multiplied by perpendicular distance, so 1 N × 1 m = 1 N m.
4. The unit newton metre is equivalent to:
A.
kg m s⁻² × m
B.
kg m² s⁻¹
C.
kg m s⁻¹
D.
kg s⁻²
Correct Answer:
kg m s⁻² × m
Explanation:
Since 1 newton equals kg m s⁻², one newton metre equals kg m s⁻² multiplied by m.
5. Which of the following quantities has the SI unit N m?
A.
Torque
B.
Force
C.
Pressure
D.
Speed
Correct Answer:
Torque
Explanation:
Torque has the SI unit newton metre (N m), whereas force has the unit newton.
6. The dimensional formula of torque is:
A.
[M L T⁻²]
B.
[M L² T⁻²]
C.
[M L⁻¹ T⁻²]
D.
[M L² T⁻¹]
Correct Answer:
[M L² T⁻²]
Explanation:
Torque equals force times distance. Its dimensions are [M L T⁻²] × [L] = [M L² T⁻²].
7. Which expression gives the SI unit of torque in terms of base SI units?
A.
kg m s⁻²
B.
kg m² s⁻²
C.
kg m s⁻¹
D.
kg m⁻¹ s⁻²
Correct Answer:
kg m² s⁻²
Explanation:
A newton metre is (kg m s⁻²) × m, which equals kg m² s⁻².
8. Torque is commonly measured in:
A.
metre per newton
B.
newton per metre
C.
newton metre
D.
newton second
Correct Answer:
newton metre
Explanation:
The SI unit of torque is newton metre because torque is the product of force and perpendicular distance.
9. Which one is the correct SI unit for the turning effect of a force?
A.
N m
B.
N/m
C.
m/N
D.
N s
Correct Answer:
N m
Explanation:
The turning effect of a force is torque, and its SI unit is newton metre (N m).
10. If torque is represented by force multiplied by distance, its SI unit is obtained by multiplying:
A.
newton by metre
B.
metre by second
C.
newton by second
D.
kilogram by metre
Correct Answer:
newton by metre
Explanation:
Torque = force × perpendicular distance, so its SI unit is newton × metre, or N m.
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