| 1. | The friction experienced by a body. when in motion, is known as ? | |
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rolling friction
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dynamic friction
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limiting friction
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static friction
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Report Question| 2. | The velocity ratio of a single purchase crab winch can be increased by ? | |
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increasing the length of the handle
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increasing the radius of the load drum
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increasing the number of teeth of the pinion
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all of the above
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| 3. | A screw jack used for lifting the loads is ? | |
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a reversible machine
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a non-reversible machine
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an ideal machine
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none of these
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| 4. | The force, by which the body is attracted, towards the centre of the earth, 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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| 5. | When two elastic bodies collide with each other ? | |
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the two bodies will momentarily come to rest after collision
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the two bodies tend to compress and deform at the surface of contact
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the two bodies begin to regain their original shape
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all of the above
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| 6. | Mass moment of inertia of a thin rod about its one end is........the mass moment of inertia of the same rod about its mid-point ? | |
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same as
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twice
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thrice
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four times
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| 7. | The point, through which the whole weight of the body acts, irrespective of its position, is known as ? | |
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moment of inertia
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centre of gravity
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centre of percussion
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centre of mass
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| 8. | The moment of a force ? | |
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is the turning effect produced by a force, on the body, on which it acts
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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
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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 int is taken
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all of the above
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| 9. | The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is ? | |
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D+d
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D-d
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Dxd
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D/d
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| 10. | The motion of a wheel of a car is ? | |
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purely translation
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purely rotational
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combined translation and rotational
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none of these
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