MECHANICAL ENGG MECHANICS
QUESTION ANSWER

1. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
A. True
B. False

ANSWER: Option B

2. The friction experienced by a body, when in motion, is known as
A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction
Answer: Option B

3. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity
v is made to struck the second ball. Both the balls after impact will move with a velocity
A. v
B. v/2
C. v/4
D. v/8
Answer: Option B


4. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
A. Agree
B. Disagree
Answer: Option A

5. The coefficient of restitution for elastic bodies is one.
A. Correct
B. Incorrect
Answer: Option B


6. The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
A. sin θ
B. cos θ
C. tan θ
D. cosec θ
Answer: Option A


7. The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.
A. less than
B. more than
C. equal to
Answer: Option B

8. The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
A. depends
B. does not depend
Answer: Option B


9. A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)
A. P = W tanα
B. P = W tan(α + φ)
C. P = W (sinα + μcosα)
D. P = W (cosα + μsinα)
Answer: Option C

10. If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
A. 30°
B. 60°
C. 90°
D. 120°

Answer: Option D

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

A. bh3/4 B. bh3/8 C. bh3/12 D. bh3/36

Answer: Option D