Physics Practice Question and Answer
8 Q: The induced current is the highest when the direction of motion of the coil is:
638 064a2afe73662c8741d1a3f77
64a2afe73662c8741d1a3f77- 1not at right angles to the magnetic fieldfalse
- 2at right angles to the electricityfalse
- 3at right angles to the electric sourcefalse
- 4at right angles to the magnetic fieldtrue
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Answer : 4. "at right angles to the magnetic field"
Explanation :
1. Induced current is highest when the direction of motion of the coil is perpendicular to the magnetic field.
Q: The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______.
633 0641974a1b34a0b67fcf4a8bf
641974a1b34a0b67fcf4a8bf- 148 Jfalse
- 212 Jfalse
- 336 Jfalse
- 424 Jtrue
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Answer : 4. "24 J"
Q: What is the constant of proportionality of an oscillator if the damping force is directly proportional to the velocity
599 063c8e053bdbddb32fda05b2a
63c8e053bdbddb32fda05b2a- 1Kg.s-1true
- 2Kg.m.s-1false
- 3Kg.sfalse
- 4Kg.m.s-2false
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Answer : 1. "Kg.s-1"
Explanation :
The damping force of an oscillating particle is observed to be proportional to velocity. The constant of proportionality can be measured in. kgs−1.
Q: Find the molecular mass of a gas that takes three times more time to effuse as compared to He with the same volume
591 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
578 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: Which among the following instruments is used to measure either direct or alternating electric current?
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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.
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?
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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 happens to the force acting between the charged particles, if the distance between these charged particles is halved?
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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.