Physics Practice Question and Answer
8 Q: Alternating current is converted to direct current –
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5efc04d030aa3b4ee606c299- 1By Transformerfalse
- 2By Rectifiertrue
- 3By Dynamofalse
- 4By Motorfalse
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Answer : 2. "By Rectifier"
Q: The depth of the bucket filled with water seems low. this is due to ?
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5f6da70e5256e8407c2e69b1- 1complete internal reflectionfalse
- 2refractiontrue
- 3Reflectionfalse
- 4None of thesefalse
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Answer : 2. "refraction"
Q: Alum is used as:
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5f4cd6195e74bc4ee54f565f- 1a disinfectantfalse
- 2a purifier for watertrue
- 3an analgesicfalse
- 4a fertilizerfalse
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Answer : 2. "a purifier for water "
Q: Instrument for measuring blueness of the sky or ocean is called ___________.
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62de73c2313eb40eb89fd06b- 1Bathymeterfalse
- 2Ceraunographfalse
- 3Cyanometertrue
- 4Barometerfalse
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Answer : 3. "Cyanometer"
Q: Which of the following is false with reference to a photo-voltaic cell?
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6113d437f65c04691bf37c32- 1It can store light energy in the form of electrical energyfalse
- 2It converts electric energy into light energytrue
- 3It is another name as solar cellfalse
- 4It can be used as infra-red detectorsfalse
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Answer : 2. "It converts electric energy into light energy"
Q: Polar satellites are used for high-resolution imaging of the earth’s surface because _____
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63c7c166bd6d9033208efbdf- 1They have better camerasfalse
- 2They are very high above the surface of the earth and travel slowly to gather more informationfalse
- 3They are closer to the surface of the earth and can cover vast areas very quicklytrue
- 4They can be launched by most countries in the worldfalse
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Answer : 3. "They are closer to the surface of the earth and can cover vast areas very quickly"
Explanation :
Explanation: Since polar satellites orbit close to the surface of the earth, it is easier to click images of the planet's surface with greater detail. Their high orbital velocity enables them to view most of the surface strip-by-stip very quickly with which high-resolution images can be constructed.
Q: Transformers are used
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5f72ea92a921aa16e6825ed6- 1To convert AC into DCfalse
- 2To convert DC to ACfalse
- 3To detect DC voltagefalse
- 4To oxidation or reduce AC voltagetrue
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Answer : 4. "To oxidation or reduce AC voltage"
Q: If the kinetic energy of a satellite is halved, its orbital radius becomes _____
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63c7b9788731ac33279af158- 1½ timestrue
- 22 timesfalse
- 34 timesfalse
- 4Infinityfalse
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Answer : 1. "½ times"
Explanation :
radius of its orbit will become half.