Entry Test MCQ :: Work And Energy
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11. |
Work done by variable force is determine by dividing |
A. |
force into small interval |
B. |
displacement into small interval |
C. |
both force and displacement into small intervals |
D. |
force into small and displacement into large intervals |
Answer: Option B
Explanation:
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12. |
Work done on the body equals to the |
A. |
change in its K.E always |
B. |
change in its P.E always |
C. |
change in its K.E and change in its P.E |
D. |
neither change in K.E and nor change in its P.E |
Answer: Option C
Explanation:
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13. |
The escape velocity of a body in gravitational field of earth is independent of |
A. |
its mass |
B. |
the angle at which it is thrown |
C. |
both its mass and the angle at which it is thrown |
D. |
gravitational field of earth |
Answer: Option C
Explanation:
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14. |
The tides raise the mater in the see roughly in a day |
A. |
once |
B. |
twice |
C. |
four time |
D. |
eight time |
Answer: Option B
Explanation:
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15. |
The source of geothermal energy is |
A. |
decay of radioactive element in the earth |
B. |
compression of material in the earth |
C. |
residual lost of the earth |
D. |
all as said in a - b and c |
Answer: Option D
Explanation:
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16. |
The highest value of escape velocity in solar system is planet |
Answer: Option C
Explanation:
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17. |
Work done by the force of friction is |
A. |
always positive |
B. |
always negative |
C. |
positive only for small frictional force |
D. |
positive only for large frictional force |
Answer: Option B
Explanation:
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18. |
Gravitational P.E of a body has |
A. |
no formula |
B. |
a formula mgh only |
C. |
a formula |
D. |
no general formula |
Answer: Option D
Explanation:
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19. |
If velocity is doubled then |
A. |
momentum increases 4 times and K.E increases 2 times |
B. |
momentum and K.E. remain same |
C. |
momentum increases 2 times and K.E increases constant |
D. |
momentum increases 2 times and K.E increases 4 time |
Answer: Option D
Explanation:
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20. |
When the speed of a moving body is doubled then |
A. |
its K.E is doubled |
B. |
its acceleration is doubled |
C. |
its P.E is doubled |
D. |
its momentum is doubled |
Answer: Option D
Explanation:
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