Parallelogram of Forces NDA Questions

NDA Physics

Parallelogram of Forces MCQ Questions


13.
When two forces acting simultaneously on a particle are represented in magnitude and direction by the adjacent sides of a parallelogram drawn from a point, then the resultant of the two forces is represented in magnitude and direction by
A.
The diagonal of the parallelogram drawn from the same point
B.
The base of the parallelogram
C.
The height of the parallelogram
D.
The area of the parallelogram
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ANSWER :
A. The diagonal of the parallelogram drawn from the same point
14.
If two forces of magnitudes 10N and 15N are acting at an angle of 60 degrees to each other, the magnitude of their resultant force is:
A.
5N
B.
20N
C.
25N
D.
30N
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ANSWER :
C. 25N
15.
If two forces of 6N and 8N act at right angles to each other, the magnitude of the resultant force is
A.
10N
B.
14N
C.
48N
D.
64N
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ANSWER :
B. 14N
16.
When two forces acting at a point are such that if they are represented by two adjacent sides of a parallelogram, then the diagonal of the parallelogram represents the:
A.
Magnitude of the resultant only
B.
Direction of the resultant only
C.
Magnitude and direction of the resultant
D.
None of the above
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ANSWER :
C. Magnitude and direction of the resultant
17.
The parallelogram law of forces states that
A.
The sum of two forces is zero
B.
The diagonal of the parallelogram represents the resultant of two forces
C.
Forces acting in opposite directions can be subtracted directly
D.
Forces acting in the same direction can be added directly
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ANSWER :
B. The diagonal of the parallelogram represents the resultant of two forces
18.
If two equal forces act on a point in directions inclined at an angle of 120° to each other, the magnitude of the resultant force is
A.
Equal to one of the forces
B.
Twice the magnitude of one of the forces
C.
Three times the magnitude of one of the forces
D.
Zero
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ANSWER :
A. Equal to one of the forces