Physics Practice Question and Answer
8 Q: The instrument that measures and records the relative humidity of air is:
1463 06163f15a8c5cc30e6058a74c
6163f15a8c5cc30e6058a74c- 1Hygrometertrue
- 2Hydrometerfalse
- 3Lactometerfalse
- 4Barometerfalse
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Answer : 1. "Hygrometer"
Q: The coefficient performance of a refrigerator is 5. If the temperature inside the freezer is -20℃, calculate the heat rejected to the surrounding
1452 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: Who gave the theory of gravity?
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61655b5c3d260361529b0876- 1Isaac Newtontrue
- 2John Adamsfalse
- 3Charles Newtonfalse
- 4Charles Babbagefalse
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Answer : 1. "Isaac Newton "
Q: Refraction of light is responsible for:
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6189e5479236c01fbea82faa- 1Shadow formationfalse
- 2Twinkling of starstrue
- 3Blue color of the skyfalse
- 4Rainbowfalse
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Answer : 2. "Twinkling of stars"
Q: The measure of inductance is
1443 161655ebe3d260361529b137f
61655ebe3d260361529b137f- 1Henrytrue
- 2Ohmfalse
- 3Amperefalse
- 4Coulombfalse
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Answer : 1. "Henry "
Q: Which of the people with myopia has glasses?
1435 05fe41ccd438750744e3258ef
5fe41ccd438750744e3258ef- 1convex lensfalse
- 2concave lenstrue
- 3Bifocal lensfalse
- 4cylindrical lensfalse
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Answer : 2. "concave lens"
Q: The unit of work is
1434 160b4b816f2c446136b8b757d
60b4b816f2c446136b8b757d- 1Wattsfalse
- 2Jouletrue
- 3Newtonfalse
- 4amperefalse
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Answer : 2. "Joule"
Q: Controls the amount of light entering the eye?
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5f6da4b2ff25c92a085bb8f2- 1Iristrue
- 2pupilfalse
- 3lensfalse
- 4side musclesfalse
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