Physics Practice Question and Answer
8 Q: What is the correct order of radiations in descending order of frequencies?
1174 064b52707efb5ba16688213e1
64b52707efb5ba16688213e1- 1Infrared > Microwaves > Radio waves > X-raysfalse
- 2Radio waves > X-rays > Microwaves > Infraredfalse
- 3X-rays > Infrared > Microwaves > Radio wavestrue
- 4Infrared > Microwaves > X-rays > Radio wavesfalse
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Answer : 3. "X-rays > Infrared > Microwaves > Radio waves"
Explanation :
The correct order of radiations is in descending order of frequencies.
X-rays > Infrared > Microwaves > Radio waves
Q: Which of the following is the best conductor of heat?
1170 0616559a93d260361529affd0
616559a93d260361529affd0- 1Leatherfalse
- 2Benzenefalse
- 3Mercurytrue
- 4Waterfalse
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Answer : 3. "Mercury "
Q: Find the molecular mass of a gas that takes three times more time to effuse as compared to He with the same volume
1144 063c8f8598731ac33279f04bb
63c8f8598731ac33279f04bb- 19 ufalse
- 264 utrue
- 327 ufalse
- 436 ufalse
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Answer : 2. "64 u"
Explanation :
Its molecular mass will be: 64u.
Q: A wire loop is rotated in a magnetic field such that the frequency of change of direction of the induced emf is
1143 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?
1052 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: Which of the following elements has the lowest melting point?
1047 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?
1030 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: What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?
1022 063c8d8afbd6d90332091d175
63c8d8afbd6d90332091d175- 11:4false
- 21:2true
- 32:1false
- 41:1false
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