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Civil Engineering [MCQS] Applied Mechanics Section -5

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1. The centre of gravity of a homogenous body is the point at which the whole




2. Pick up the correct statement from the following :




3. Centre of gravity of a thin hollow cone lies on the axis of symmmetry at a height of




4. A ball of mass 1 kg moving with a velocity of 2 m/sec collides a stationary ball of mass 2 kg and comes to rest after impact. The velocity of the second ball after impact will be




5. Periodic time of a particle moving with simple harmonic motion is the time taken by the particle for




6. The motion of a bicycle wheel is




7. A particle moving with a simple harmonic motion, attains its maximum velocity when it passes




8. The practical units of work, is




9. The rate of change of displacement of a body with respect to its surrounding, is known




10. The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is




11. For a self-locking machine, the efficiency should be




12. When a body moves round a fixed axis, it has




13. From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The c.g. of the remainder is at a height of




14. The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator




15. When a body falls freely under gravitational force, it possesses




16. A rigid body suspended Vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called




17. If a ball which is dropped from a height of 2.25 m on a smooth floor attains the height of bounce equal to 1.00 m, the coefficient of the restitution between the ball and floor, is




18. The piston of a steam engine moves with a simple harmonic motion. The crank rotates 120 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 0.5 metre from the centre, is




19. The frequency of oscillation on moon as compared to that on earth, will be




20. The velocity ratio of an inclined plane of inclination θ with horizontal for lifting a load is




21. Pick up the incorrect statement from the following. In a simple harmonic motion




22. The gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of




23. The point about which combined motion of rotation and translation of a rigid body takes place, is known as




24. A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is




25. A point subjected to a number of forces will be in equilibrium, if




26. Periodic time of body moving with simple harmonic motion, is




27. On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts




28. The centre of gravity of a plane lamina will not be at its geometrical centre if it is a




29. The motion of a particle moving with S.H.M. from an extremity to the other, constitutes




30. Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by




31. The velocity of a moving body, is




32. The centre of gravity of a quadrant of a circle lies along its central radius at a distance of




33. A geo-stationary satellite is one which orbits the earth with a velocity of rotation of




34. The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane




35. If a body is acted upon by a number of coplaner non-concurrent forces, it may