Physics Questions Practice Question and Answer

Q:

Which of the following is correct about uniform acceleration?

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  • 1
    An object moving on friction-less surface can gain uniform acceleration.
    Correct
    Wrong
  • 2
    An object under free fall is an example of uniform acceleration.
    Correct
    Wrong
  • 3
    An object moving with constant speed is an example of uniform acceleration.
    Correct
    Wrong
  • 4
    Motion of a spring is an example of uniform acceleration.
    Correct
    Wrong
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Answer : 2. "An object under free fall is an example of uniform acceleration."
Explanation :

1. The change in velocity of an object at equal time intervals is called uniform acceleration.

2. A freely falling object is an example of uniform acceleration.

Q:

Consider copper and aluminum wire whose length and resistance are the same. Also, the specific resistance of aluminum is more than copper. Select the correct statement

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  • 1
    Copper and aluminum mass are the same
    Correct
    Wrong
  • 2
    Copper wire has more mass than the aluminum wire
    Correct
    Wrong
  • 3
    Copper wire has less mass than the aluminum wire
    Correct
    Wrong
  • 4
    The information given is incomplete
    Correct
    Wrong
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Answer : 4. "The information given is incomplete "

Q:

The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______. 

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  • 1
    48 J
    Correct
    Wrong
  • 2
    12 J
    Correct
    Wrong
  • 3
    36 J
    Correct
    Wrong
  • 4
    24 J
    Correct
    Wrong
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Answer : 4. "24 J"

Q:

What does an electric dipole experience when it is kept in the non-uniform electric field?

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  • 1
    Only a force
    Correct
    Wrong
  • 2
    Only torque
    Correct
    Wrong
  • 3
    Force and torque both
    Correct
    Wrong
  • 4
    Neither force nor torque
    Correct
    Wrong
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Answer : 3. "Force and torque both"
Explanation :

An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.


Q:

Which of the following elements has the largest atomic radii?

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  • 1
    Beryllium
    Correct
    Wrong
  • 2
    Lithium
    Correct
    Wrong
  • 3
    Nitrogen
    Correct
    Wrong
  • 4
    Carbon
    Correct
    Wrong
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Answer : 2. "Lithium"
Explanation :

Francium (Fr) has the highest atomic radius in the periodic table. It belongs to the alkali metals group. Its atomic number is 87. The periodic trend of atomic radius suggests that the atomic radius usually decreases along a period (left to right) and increases down a group (top to bottom).

Q:

Degree of dissociation does not depend on which of the following factors?

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  • 1
    Nature of the solute
    Correct
    Wrong
  • 2
    Nature of the solvent
    Correct
    Wrong
  • 3
    Sound
    Correct
    Wrong
  • 4
    Concentration
    Correct
    Wrong
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Answer : 3. "Sound "
Explanation :

The Degree of dissociation does not depend on catalyst.The equivalent conductivity of 0.1M weak acid is 100 times less than that at infinite dilution.

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

418 0

  • 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.

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