Physics Questions Practice Question and Answer
8 Q: A wire loop is rotated in a magnetic field such that the frequency of change of direction of the induced emf is
1240 063c8dfd58731ac33279e451b
63c8dfd58731ac33279e451b- 1Six times per revolutionfalse
- 2Four times per revolutionfalse
- 3Twice per revolutiontrue
- 4Once per revolutionfalse
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Answer : 3. "Twice per revolution"
Q: In which year was the Doppler effect discovered by Austrian scientist Christian Doppler, which describes the change in frequency of any kind of sound or light wave produced by a moving source with respect to an observer?
1230 064b18288568e7ff594a2d3ec
64b18288568e7ff594a2d3ec- 11846false
- 21844false
- 31842true
- 41840false
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Answer : 3. "1842"
Explanation :
The Doppler effect was discovered by Austrian scientist Christian Doppler in 1842, describing the change in frequency of any type of sound or light wave produced by a moving source with respect to an observer.
Q: What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?
1193 063c8d8afbd6d90332091d175
63c8d8afbd6d90332091d175- 11:4false
- 21:2true
- 32:1false
- 41:1false
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Answer : 2. "1:2"
Q: Which of the following elements has the lowest melting point?
1171 062de6dd1313eb40eb89fc72f
62de6dd1313eb40eb89fc72f- 1Chromiumfalse
- 2Hydrogentrue
- 3Zincfalse
- 4Silverfalse
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Answer : 2. "Hydrogen"
Q: Why do the astronauts in the international space station experience weightlessness?
1154 063c7a8631e8e3f3e1a3590ed
63c7a8631e8e3f3e1a3590ed- 1The acceleration due to gravity at that height is Zerofalse
- 2They are falling towards the earthtrue
- 3They have specially designed spacesuits for this purposefalse
- 4The gravity of the moon and earth cancel out at that altitudefalse
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Answer : 2. "They are falling towards the earth"
Q: How much is polar orbit inclination with the earth's equatorial plane?
1123 063c7a5d8bdbddb32fd9cc70c
63c7a5d8bdbddb32fd9cc70c- 10 degreesfalse
- 245 degreesfalse
- 390 degreestrue
- 4180 degreesfalse
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Answer : 3. "90 degrees"
Q: What happens to the force acting between the charged particles, if the distance between these charged particles is halved?
1078 063c8e92bbdbddb32fda08d59
63c8e92bbdbddb32fda08d59- 1It increases by four timestrue
- 2It gets doubledfalse
- 3It becomes halffalse
- 4It reduces by one-fourthfalse
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Answer : 1. "It increases by four times "
Explanation :
So, when the distance between the two charges is halved, the force is increased four times.
Q: Which among the following instruments is used to measure either direct or alternating electric current?
1049 064b17cd02dc867f593e95d61
64b17cd02dc867f593e95d61- 1Wattmeterfalse
- 2Hygrometerfalse
- 3Ammetertrue
- 4Pyrometerfalse
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Answer : 3. "Ammeter"
Explanation :
1. The device which is used to measure electric current in an electric circuit is called ammeter.
2. The resistance of an ideal ammeter is always zero and the electric circuit is always connected in series.