Engineering Mechanics MCQs Quiz - Set 03

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Q1. A pair of smith’s tongs is an example of the lever of

(A) Zeroth order
(B) First order
(C) Second order
(D) Third order

Answer: (C) Second order

Q2. The center of gravity of a triangle lies at the point of

(A) Concurrence of the medians
(B) Intersection of its altitudes
(C) Intersection of bisector of angles
(D) Intersection of diagonals

Answer: (A) Concurrence of the medians

Q3. Non-coplanar concurrent forces are those forces which

(A) Meet at one point, but their lines of action do not lie on the same plane
(B) Do not meet at one point and their lines of action do not lie on the same plane
(C) Meet at one point and their lines of action also lie on the same plane
(D) Do not meet at one point, but their lines of action lie on the same plane

Answer: (A) Meet at one point, but their lines of action do not lie on the same plane

Q4. The length of a second’s pendulum is

(A) 94.9 cm
(B) 99.4 cm
(C) 100 cm
(D) 101 cm

Answer: (B) 99.4 cm

Q5. Pick up wrong statement about friction force for dry surfaces. Friction force is

(A) Proportional to normal load between the surfaces
(B) Dependent on the materials of contact surface
(C) Proportional to velocity of sliding
(D) Independent of the area of contact surfaces

Answer: (C) Proportional to velocity of sliding

Q6. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than

(A) Two members with unknown forces of the frame
(B) Three members with unknown forces of the frame
(C) Four members with unknown forces of the frame
(D) Three members with known forces of the frame

Answer: (B) Three members with unknown forces of the frame

Q7. The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is

(A) [√(4p² – q²)]/6
(B) (4p² – q²)/6
(C) (p² – q²)/4
(D) (p² + q²)/4

Answer: (A) [√(4p² – q²)]/6

Q8. In order to double the period of simple pendulum, the length of the string should be

(A) Halved
(B) Doubled
(C) Quadrupled
(D) None of these

Answer: (C) Quadrupled

Q9. 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

Answer: (D) Moment of the couple

Q10. The centre of percussion is below the centre of gravity of the body and is at a distance equal to

(A) h/kG
(B) h2/kG
(C) kG2/h
(D) h × kG

Answer: (C) kG2/h

Q11. The unit of force in S.I. units is

(A) kilogram
(B) Newton
(C) Watt
(D) Dyne

Answer: (B) Newton

Q12. Moment of inertia of a circular section about its diameter (d) is

(A) πd3/16
(B) πd3/32
(C) πd4/32
(D) πd4/64

Answer: (D) πd4/64

Q13. One joule means that

(A) Work is done by a force of 1 N when it displaces a body through 1 m
(B) Work is done by a force of 1 kg when it displaces a body through 1 m
(C) Work is done by a force of 1 dyne when it displaces a body through 1 cm
(D) Work is done by a force of 1 g when it displaces a body through 1 cm

Answer: (A) Work is done by a force of 1 N when it displaces a body through 1 m

Q14. In the equation of virtual work, following force is neglected

(A) Reaction of any smooth surface with which the body is in contact
(B) Reaction of a rough surface of a body which rolls on it without slipping
(C) Reaction at a point or an axis, fixed in space, around which a body is constrained to turn
(D) All of the above

Answer: (D) All of the above

Q15. The angle between two forces when the resultant is maximum and minimum respectively are

(A) 0° and 180°
(B) 180° and 0°
(C) 90° and 180°
(D) 90° and 0°

Answer: (A) 0° and 180°

Q16. The term ‘Centroid’ is

(A) The same as centre of gravity
(B) The point of suspension
(C) The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
(D) None of the above

Answer: (A) The same as centre of gravity

Q17. A machine having an efficiency greater than 50%, is known as

(A) Reversible machine
(B) Non-reversible machine
(C) Neither reversible nor non-reversible machine
(D) Ideal machine

Answer: (A) Reversible machine

Q18. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

(A) Towards the wall at its upper end
(B) Away from the wall at its upper end
(C) Upwards at its upper end
(D) Downwards at its upper end

Answer: (C) Upwards at its upper end

Q19. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

(A) Friction
(B) Limiting friction
(C) Repose
(D) Kinematic friction

Answer: (C) Repose

Q20. 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