Engineering Mechanics Objective Type Questions with Answers - Set 05 - ObjectiveBooks

# Practice Test: Question Set - 05

1. Coefficient of friction depends upon
(A) Area of contact only
(B) Nature of surface only
(C) Both (A) and (B)
(D) None of these

2. Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

(A) (BD³/12) - (bd³/12)
(B) (DB³/12) - (db³/12)
(C) (BD³/36) - (bd³/36)
(D) (DB³/36) - (db³/36)

3. Which of the following is a vector quantity?
(A) Energy
(B) Mass
(C) Momentum
(D) Angle

4. The maximum velocity of a particle moving with simple harmonic motion is
(A) ω
(B) ωr
(C) ω2r
(D) ω/r

5. The product of either force of couple with the arm of the couple is called
(A) Resultant couple
(B) Moment of the forces
(C) Resulting couple
(D) Moment of the couple

6. The moment of a force
(A) Is the turning effect produced by a force, on the body, on which it acts
(B) Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
(C) Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
(D) All of the above

7. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve
(A) Circular arc
(B) Parabola
(C) Hyperbola
(D) Elliptical

8. The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is
(A) 50 mm
(B) 75 mm
(C) 87.5 mm
(D) 125 mm

9. Kinetic friction is the
(A) Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
(B) Ratio of limiting friction and normal reaction
(C) The friction force acting when the body is just about to move
(D) The friction force acting when the body is in motion

10. According to Newton's first law of motion,
(A) Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
(B) The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
(C) To every action, there is always an equal and opposite reaction
(D) None of the above

11. Which of the following is not a vector quantity?
(A) Weight
(B) Velocity
(C) Acceleration
(D) Force

12. The mechanical advantage of a lifting machine is the ratio of
(A) Distance moved by effort to the distance moved by load
(B) Load lifted to the effort applied
(C) Output to the input
(D) All of the above

13. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate
(A) 0.5 cm
(B) 1.0 cm
(C) 1.5 cm
(D) 2.5 cm

14. In ideal machines, mechanical advantage is __________ velocity ratio.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

15. Frictional force encountered after commencement of motion is called
(A) Limiting friction
(B) Kinematic friction
(C) Frictional resistance
(D) Dynamic friction

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