Physics Practice Question and Answer

Q:

The capacity of parallel plate condenser is dependent on the

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  • 1
    The separation between the plates
    Correct
    Wrong
  • 2
    The metal used for the construction
    Correct
    Wrong
  • 3
    The thickness of the plate
    Correct
    Wrong
  • 4
    The potential applied across the plates
    Correct
    Wrong
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Answer : 2. "The metal used for the construction"
Explanation :

Therefore, the capacity of a parallel plate capacitor directly depends on the relative permittivity of dielectric material, the permittivity of space, the area of plates, and is inversely dependent on the separation between the plates.

Q:

Find the molecular mass of a gas that takes three times more time to effuse as compared to He with the same volume

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  • 1
    9 u
    Correct
    Wrong
  • 2
    64 u
    Correct
    Wrong
  • 3
    27 u
    Correct
    Wrong
  • 4
    36 u
    Correct
    Wrong
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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

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  • 1
    Six times per revolution
    Correct
    Wrong
  • 2
    Four times per revolution
    Correct
    Wrong
  • 3
    Twice per revolution
    Correct
    Wrong
  • 4
    Once per revolution
    Correct
    Wrong
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Answer : 3. "Twice per revolution"

Q:

The induced current is the highest when the direction of motion of the coil is:

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  • 1
    not at right angles to the magnetic field
    Correct
    Wrong
  • 2
    at right angles to the electricity
    Correct
    Wrong
  • 3
    at right angles to the electric source
    Correct
    Wrong
  • 4
    at right angles to the magnetic field
    Correct
    Wrong
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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:

According to Dalton’s atomic theory, atoms combine in the ratio of small whole numbers to form ______.

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  • 1
    Neutrons
    Correct
    Wrong
  • 2
    Molecules
    Correct
    Wrong
  • 3
    Protons
    Correct
    Wrong
  • 4
    Compounds
    Correct
    Wrong
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Answer : 4. "Compounds"
Explanation :

1. According to Dalton's atomic theory, atoms combine in small whole-number proportions to form compounds.

Q:

What is the constant of proportionality of an oscillator if the damping force is directly proportional to the velocity

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  • 1
    Kg.s-1
    Correct
    Wrong
  • 2
    Kg.m.s-1
    Correct
    Wrong
  • 3
    Kg.s
    Correct
    Wrong
  • 4
    Kg.m.s-2
    Correct
    Wrong
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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:

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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  • 1
    1846
    Correct
    Wrong
  • 2
    1844
    Correct
    Wrong
  • 3
    1842
    Correct
    Wrong
  • 4
    1840 
    Correct
    Wrong
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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:

How much is polar orbit inclination with the earth's equatorial plane?

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  • 1
    0 degrees
    Correct
    Wrong
  • 2
    45 degrees
    Correct
    Wrong
  • 3
    90 degrees
    Correct
    Wrong
  • 4
    180 degrees
    Correct
    Wrong
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Answer : 3. "90 degrees"

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