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## Q1. The centre of gravity of a uniform lamina lies at

(A) The centre of heavy portion

(B) The bottom surface

(C) The midpoint of its axis

(D) All of the above

Answer: (C) The midpoint of its axis

## Q2. 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

Answer: (C) 87.5 mm

## Q3. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

(A) 38 m

(B) 62.5 m

(C) 96 m

(D) 124 m

Answer: (B) 62.5 m

## Q4. The efficiency of a lifting machine is the ratio of

(A) Output to the input

(B) Work done by the machine to the work done on the machine

(C) Mechanical advantage to the velocity ratio

(D) All of the above

Answer: (D) All of the above

## Q5. Center of percussion is

(A) The point of C.G.

(B) The point of metacenter

(C) The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

(D) Point of suspension

Answer: (C) The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

## Q6. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one

(A) Ellipse

(B) Hyperbola

(C) Parabola

(D) Circle

Answer: (B) Hyperbola

## Q7. The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

(A) ω/r

(B) ω.r

(C) ω2/r

(D) ω2.r

Answer: (B) ω.r

## Q8. The unit of angular velocity is

(A) m/min

(B) rad/s

(C) Revolutions/min

(D) Both (B) and (C)

Answer: (D) Both (B) and (C)

## Q9. The moment of inertia of a thin rod of mass ‘m’ and length ‘l’, about an axis through its centre of gravity and perpendicular to its length is

(A) ml2/4

(B) ml2/ 6

(C) ml2/8

(D) ml2/12

Answer: (D) ml2/12

## Q10. Which of the following statement is correct?

(A) The algebraic sum of the forces, constituting the couple is zero

(B) The algebraic sum of the forces, constituting the couple, about any point is the same

(C) A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense

(D) All of the above

Answer: (D) All of the above

## Q11. Lami’s theorem states that

(A) Three forces acting at a point will be in equilibrium

(B) Three forces acting at a point can be represented by a triangle, each side being proportional to force

(C) If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

(D) If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

Answer: (D) If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

## Q12. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

(A) Coplanar concurrent forces

(B) Coplanar non-concurrent forces

(C) Like parallel forces

(D) Unlike parallel forces

Answer:(D) Unlike parallel forces

## Q13. 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

Answer: (D) The friction force acting when the body is in motion

## Q14. When the lift is moving upwards with some acceleration, the pressure exerted by a man is *__* to its acceleration.

*__*

(A) Directly proportional

(B) Inversely proportional

(C) Cube root

(D) None of these

Answer: (A) Directly proportional

## Q15. According to principle of moments

(A) If a system of coplanar forces is in equilibrium, then their algebraic sum is zero

(B) If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

(C) The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point

(D) Positive and negative couples can be balanced

Answer: (B) If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

## Q16. The static friction

(A) Bears a constant ratio to the normal reaction between the two surfaces

(B) Is independent of the area of contact, between the two surfaces

(C) Always acts in a direction, opposite to that in which the body tends to move

(D) All of the above

Answer:(D) All of the above

## Q17. In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively

Engineering Mechanics question no. 09, set 09

(A) √3. W (tensile) and 2W (compressive)

(B) 2W (tensile) and √3. W (compressive)

(C) 2√3. W (tensile) and 2√3. W (compressive)

(D) None of the above

Answer:(A) √3. W (tensile) and 2W (compressive)

## Q18. The C.G. of a solid hemisphere lies on the central radius 3r

(A) At distance — from the plane base 3r

(B) At distance — from the plane base 3r

(C) At distance — from the plane base 3r

(D) At distance — from the plane base

Answer: (D) At distance — from the plane base

## Q19. The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane *__* the angle of friction.

*__*

(A) Equal to

(B) Less than

(C) Greater than

(D) None of these

Answer:(A) Equal to

## Q20. Forces are called coplanar when all of them acting on body lie in

(A) One point

(B) One plane

(C) Different planes

(D) Perpendicular planes

Answer: (B) One plane

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Engineering Mechanics – Set 01

Engineering Mechanics – Set 02

Engineering Mechanics – Set 03

Engineering Mechanics – Set 04

Engineering Mechanics – Set 05

Engineering Mechanics – Set 06

Engineering Mechanics – Set 07

Engineering Mechanics – Set 08

Engineering Mechanics – Set 09

Engineering Mechanics – Set 10

Engineering Mechanics – Set 11

Engineering Mechanics – Set 12

Engineering Mechanics – Set 13

Engineering Mechanics – Set 14

Engineering Mechanics – Set 15

Engineering Mechanics – Set 16

Engineering Mechanics – Set 17