MCQ Questions on Applied Mechanics for Competitive Exams
A retarding force on a body does not
A. change the motion of the body
B. retard the motion of the body
C. introduce the motion of the body
D. none of these.
Ans-B
The force acting on a point on the surface of a rigid body may be considered to act
A. at the centre of gravity of the body
B. on the periphery of the body
C. on any point on the line of action of the force
D. at any point on the surface normal to the line of action of the force.
Ans- C
A number of forces acting simultaneously on a particle of a body
A. may not be replaced by a single force
B. may be replaced by a single force
C. may be replaced by a single force through C.G. of the body
D. may be replaced by a couple
Ans-B
Parallelogram Law of Forces states, “if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by
A. its longer side”
B. its shorter side”
C. the diagonal of the parallelogram which does not pass through the point of intersection of the forces”
D. the diagonal of the parallelogram which passes through the point of intersection of the forces”
Ans-D
The resultant of two forces P and Q acting at an angle 0, is
A. P2 + Q2 + 2P sin 0
B. P2 + Q2 + 2PQ cos 0
C. P2 + Q2 + 2PQ tan 0
D.P2+ Q2 + 2PQ cos 0
Ans-D
If the resultant of two forces P and Q acting at an angle 0 makes an angle a with P, then tan a equals P sin 0 Q sin 0
A. P – Q cos 0
B. P + Q cos 0 P sin 0
C. Q sin 0
D. P + Q tan 0 Q+Psin 0
Ans-B
If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to
A. 7 kg
B. 1 kg
C. 5 kg
D. 117 kg
Ans-C
Two forces act an angle of 120?. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is
A. 20 kg
B. 25 kg
C. 30 kg
D. 35 kg
Ans-B
The resolved part of the resultant of two forces inclined at an angle 0 in a given direction is
A. algebraic sum of the resolveeparts of the forces in the direction
B.- arithmetical sum of the resolved parts of the forces in the direction
C. difference of the forces multiplied by cosine 0?
D. sum of the forces multiplied by the sine 0
Ans-A
A point subjected to a number of forces will be in equilibrium, if
A. sum of resolved parts in any two directions at right angles, are both zero
B. algebraic sum of the forces is zero
C. two resolved parts in any two directions at right angles are equal
D. algebraic sum of the moments of the forces about the point is zero
Ans-A
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