Physics Practice Question and Answer
8 Q: A 1 kg object is dropped from a height of 30 meters to the ground. The work done by the force of gravity will be
1315 05f86a39bb7ad805e26c16cb0
5f86a39bb7ad805e26c16cb0- 130 Jfalse
- 210 Jfalse
- 30.33 Jfalse
- 4300 Jtrue
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Answer : 4. "300 J"
Q: The unit of which physical quantity is not pascal?
1314 0605c55f33af5ff63fd6b4361
605c55f33af5ff63fd6b4361- 1Moment of inertiatrue
- 2Pressurefalse
- 3Stressfalse
- 4Young’s modulusfalse
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Answer : 1. "Moment of inertia"
Q: The unit of work is
1313 160b4b816f2c446136b8b757d
60b4b816f2c446136b8b757d- 1Wattsfalse
- 2Jouletrue
- 3Newtonfalse
- 4amperefalse
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Answer : 2. "Joule"
Q: Which of the people with myopia has glasses?
1313 05fe41ccd438750744e3258ef
5fe41ccd438750744e3258ef- 1convex lensfalse
- 2concave lenstrue
- 3Bifocal lensfalse
- 4cylindrical lensfalse
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Answer : 2. "concave lens"
Q: The coefficient performance of a refrigerator is 5. If the temperature inside the freezer is -20℃, calculate the heat rejected to the surrounding
1311 063c921551e8e3f3e1a3a5a0a
63c921551e8e3f3e1a3a5a0a- 1110Ctrue
- 2false
410C
- 3false
210C
- 4false
310C
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Answer : 1. "110C"
Explanation :
A heat pump is a heat engine working in reverse direction. A refrigerator is basically a heat pump, which is used to pump heat (absorbed from materials at lower temperatures inside the refrigerator) to the surroundings at higher temperatures. The coefficient of performance of a refrigerator is defined as the ratio of heat removed
Why
2
Energy from inside the refrigerator per cycle
w
given per cycle for heat removal,
α
,
Why
2
,
w
,
Q: Refraction of light is responsible for:
1310 06189e5479236c01fbea82faa
6189e5479236c01fbea82faa- 1Shadow formationfalse
- 2Twinkling of starstrue
- 3Blue color of the skyfalse
- 4Rainbowfalse
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Answer : 2. "Twinkling of stars"
Q: Pressure inside a soap bubble is-
1310 06062c4148278fd4419261ced
6062c4148278fd4419261ced- 1More than atmospheric pressuretrue
- 2Less than atmospheric pressurefalse
- 3Equal to atmospheric pressurefalse
- 4Half of atmospheric pressure/false
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Answer : 1. "More than atmospheric pressure"
Q: Which of the following produces more flame?
1307 16137474b576b113a3f9cd690
6137474b576b113a3f9cd690- 1Steamtrue
- 2hot airfalse
- 3Sun raysfalse
- 4All thesefalse
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