| 1. | A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of ? | |
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1m
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2m
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3m
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4m
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Report Question| 2. | Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then ? | |
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their algebraic sum is zero
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their lines of action are at equal distances
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the algebraic sum of their moments about any point in their plane is zero
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the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
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| 3. | The unit of energy in S.I. units is ? | |
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dyne
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watt
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kg-m
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joule
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| 4. | Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity ? | |
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v
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v/2
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v/4
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v/8
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| 5. | Non-coplaner concurrent forces are those forces which ? | |
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meet at one point, but their lines of action do not lie on the same plane
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do not meet at one point and their lines of action do not lie on the same plane
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meet at one point and their lines of action also lie on the same plane
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do not meet at one point, but their lines of action lie on the same plane
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| 6. | The maximum mechanical advantage of a lifting machine is ? | |
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1+m
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1-m
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1/m
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m
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| 7. | For any system of coplaner forces, the condition of equilibrium is that the ? | |
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algebraic sum of the horizontal components of all the forces should be zero
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algebraic surn of the vertical components of all the forces should be zero
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algebraic surn of moments of all the forces about any point should be zero
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all of the above
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| 8. | One joule is equal to ? | |
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0.1 N-m
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1 N-m
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10 N-m
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100 N-m
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| 9. | The acceleration of a body sliding down an inclined surface is ? | |
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g sin ?
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g cos ?
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g tan ?
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none of these
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| 10. | A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following: ? | |
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both the balls undergo an equal change in momentum
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the change in momentum suffered by rubber ball is more than the lead ball
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the change in momentum suffered by rubber ball is less than the lead ball
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none of the above
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