physics : class11 Anticlockwise Moment : Moment of a Force : Motion of System of Particles and Rigid Body MCQ Questions and Answers
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Anticlockwise Moment
MCQ questions and answers.
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MCQ Questions
1. According to the usual sign convention, the moment of a force that tends to rotate a body anticlockwise is taken as:
A.
Positive
B.
Negative
C.
Zero
D.
Undefined
Correct Answer:
Positive
Explanation:
An anticlockwise moment is conventionally assigned a positive sign.
2. A force of 10 N acts perpendicular to a spanner at a distance of 0.5 m from its pivot and produces anticlockwise rotation. What is the anticlockwise moment?
A.
2 N m
B.
5 N m
C.
10 N m
D.
20 N m
Correct Answer:
5 N m
Explanation:
Moment equals force multiplied by perpendicular distance from the pivot: 10 × 0.5 = 5 N m. Since the rotation is anticlockwise, it is an anticlockwise moment.
3. A force produces an anticlockwise moment about a pivot when its line of action tends to rotate the body in which direction?
A.
Clockwise
B.
Anticlockwise
C.
Vertically upward only
D.
Along the line of action only
Correct Answer:
Anticlockwise
Explanation:
An anticlockwise moment is the turning effect of a force that tends to rotate the body anticlockwise about the pivot.
4. A 4 N force acts perpendicular to a rod at a distance of 2 m from its pivot. If it turns the rod anticlockwise, its moment is:
A.
2 N m anticlockwise
B.
6 N m anticlockwise
C.
8 N m anticlockwise
D.
16 N m anticlockwise
Correct Answer:
8 N m anticlockwise
Explanation:
The moment is force multiplied by perpendicular distance: 4 × 2 = 8 N m. The direction is anticlockwise as stated.
5. Which of the following quantities determines the magnitude of an anticlockwise moment of a force about a pivot?
A.
Force and perpendicular distance from the pivot
B.
Mass and volume only
C.
Time and temperature only
D.
Speed and density only
Correct Answer:
Force and perpendicular distance from the pivot
Explanation:
The magnitude of moment is calculated as force multiplied by the perpendicular distance of its line of action from the pivot.
6. If the perpendicular distance from a pivot is doubled while the force remains unchanged, an anticlockwise moment becomes:
A.
Half as large
B.
Unchanged
C.
Twice as large
D.
Zero
Correct Answer:
Twice as large
Explanation:
Moment equals force multiplied by perpendicular distance. Doubling the distance therefore doubles the anticlockwise moment.
7. A force of 6 N produces an anticlockwise moment of 18 N m about a pivot. What is the perpendicular distance of the force from the pivot?
A.
0.3 m
B.
3 m
C.
12 m
D.
24 m
Correct Answer:
3 m
Explanation:
Using moment = force × perpendicular distance, the distance is 18 ÷ 6 = 3 m.
8. When the line of action of a force passes through the pivot, the anticlockwise moment produced by the force is:
A.
Maximum
B.
Equal to the force
C.
Zero
D.
Always negative
Correct Answer:
Zero
Explanation:
If the line of action passes through the pivot, the perpendicular distance is zero, so the moment is zero and no anticlockwise turning effect is produced.
9. A 5 N force acts at a perpendicular distance of 0.4 m from a pivot and produces anticlockwise rotation. What is its moment?
A.
0.8 N m
B.
2 N m
C.
5.4 N m
D.
12.5 N m
Correct Answer:
2 N m
Explanation:
The anticlockwise moment is force multiplied by perpendicular distance: 5 × 0.4 = 2 N m.
10. Which unit is used for the moment of an anticlockwise force?
A.
N
B.
N m
C.
N per m
D.
m per N
Correct Answer:
N m
Explanation:
Moment is calculated by multiplying force in newtons by distance in metres, giving the unit newton metre, or N m.
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