| 1. | The unit of work in S.I. units is ? | |
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newton
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erg
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kg-m
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joule
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Report Question| 2. | The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then ? | |
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P=Q
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Q=R
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Q=2R
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none of these
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| 3. | A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act ? | |
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downward at its upper end
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upward at its upper end
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zero at its upper end
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perpendicular to the wall at its upper end
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| 4. | The forces which co not meet at one point and their lines of action do not lie on the same plane are known as ? | |
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coplaner concurrent forces
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coplaner non-concurrent forces
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non-coplaner concurrent forces
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none of these
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| 5. | The total motion possessed by a body, is called ? | |
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impulsive force
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mass
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weight
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momentum
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| 6. | The term 'centroid' is ? | |
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the same as centre of gravity
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the point of suspension
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the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
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none of the above
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| 7. | The time of flight of a projectile on downward inclined plane depends upon ? | |
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angle of projection
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angle of inclination of the plane
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both (a) and (b)
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none of these
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| 8. | The time of flight (t) of a projectile on a horizontal plane is given by ? | |
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t = 2u sin ? / g
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t = 2u cos ? / g
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t = 2u tan ? / g
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t = 2u / sin ? g
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| 9. | A pendulum which executes one beat per second is known as ? | |
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simple pendulum
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compound pendulum
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torsional pendulum
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second's pendulum
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| 10. | The rate of doing work is known as ? | |
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potential energy
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kinetic energy
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power
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none of these
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