# Engineering Mechanics MCQs Quiz – Set 03 :: Mechanical Engineering

Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.

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

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

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

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

## 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

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

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

(A) πd3/16
(B) πd3/32
(C) πd4/32
(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

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

## 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

## 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