**Last updated:** August 14, 2020

1. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

2. The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then

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

4. The velocity ratio for the third system of pulleys is

5. When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.

6. The moment of inertia of a square of side a about its base is a

^{4}/ 3.
7. Frequency of vibrations means the number of cycles per second.

8. The time of flight (t) of a projectile on a horizontal plane is given by

9. The law of motion involved in the recoil of gun is

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

11. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

12. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

13. The velocity ratio for the second system of pulleys is n.

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

15. If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

16. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

17. If the gravitational acceleration at any place is doubled, then the weight of a body will be

18. A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.

19. Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)

20. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

Engineering Mechanics MCQ 8

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