Engineering Mechanics MCQs Archives

31. The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

coplaner concurrent forces

coplaner non-concurrent forces

non-coplaner concurrent forces

none of these

✅ The correct answer is option D.

32. The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)

α = 45° + φ/2

α = 45° – φ/2

α = 90° + φ

α = 90° – φ

✅ The correct answer is option B.

33. The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

3r/ 8

4r/ 3π

8r/3

3r/4π

✅ The correct answer is option B.

34. The centre of gravity of a triangle lies at a point where its medians intersect each other.

TRUE

FALSE

✅ The correct answer is option A.

35. The unit of angular velocity is

m/min

rad/s

revolutions/min

both (B) and (C)

✅ The correct answer is option D.

36. The ideal angle of banking provided on the curves on roads depends upon

weight of the vehicle

(velocity)2 of the vehicle

nature of the road surface

coefficient of frictio

✅ The correct answer is option B.

37. The moment of a force

is the turning effect produced by a force, on the body, on which it acts

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

is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

all of the above

✅ The correct answer is option D.

38. A framed structure, as shown in the below figure, is a

perfect frame

deficient frame

redundant frame

none of the above

✅ The correct answer is option A.

39. If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium.

Agree

Disagree

✅ The correct answer is option B.

40. The velocity of a body on reaching the ground from a height h, is

✅ The correct answer is option C.