Physics Practice Question and Answer

Q:

What is the nature of real reflection?

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  • 1
    Reverse
    Correct
    Wrong
  • 2
    straight
    Correct
    Wrong
  • 3
    upright and upside down
    Correct
    Wrong
  • 4
    None of these
    Correct
    Wrong
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Answer : 1. "Reverse"

Q:

What is the degree of dissociation for strong electrolytes?

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  • 1
    1
    Correct
    Wrong
  • 2
    0
    Correct
    Wrong
  • 3
    Less than 1
    Correct
    Wrong
  • 4
    Greater than 1
    Correct
    Wrong
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Answer : 1. "1"
Explanation :

Strong electrolytes have a degree of dissociation close to one, while weak electrolytes have a degree of dissociation less than one. Solvent nature: Solvents with a high dielectric constant show more dissociation. Dilution: As the solution is diluted, the degree of dissociation increases.

Q:

Most waves used for communication purposes rely on geostationary satellites because _____

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  • 1
    They cannot transmit data at long distances due to curvature of the earth
    Correct
    Wrong
  • 2
    They are reflected by the atmosphere
    Correct
    Wrong
  • 3
    They are very cheap
    Correct
    Wrong
  • 4
    It does not occupy space on the earth’s surface
    Correct
    Wrong
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Answer : 1. "They cannot transmit data at long distances due to curvature of the earth"
Explanation :

Explanation: Most communication waves cannot transmit data accurately over long distances due to the curvature of the earth. They can only do so in the line of sight. However, they are not reflected by the ionosphere like radio waves and can be relayed to a wide area using geostationary satellites.

Q:

What is the direction of torque?

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  • 1
    Opposite to the direction of applied force
    Correct
    Wrong
  • 2
    Parallel to the radius
    Correct
    Wrong
  • 3
    Perpendicular to the direction of applied force
    Correct
    Wrong
  • 4
    Same as the direction of applied force
    Correct
    Wrong
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Answer : 3. "Perpendicular to the direction of applied force"

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 an inductor whose linear dimensions are tripled and the total number of turns per unit length is kept constant, what happens to the self-inductance?

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  • 1
    9 times
    Correct
    Wrong
  • 2
    3 times
    Correct
    Wrong
  • 3
    27 times
    Correct
    Wrong
  • 4
    1/3 times
    Correct
    Wrong
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Answer : 2. "3 times "

Q:

What are the conditions for gas like Carbon monoxide to obey the ideal gas laws?

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  • 1
    Low temperature and low pressure
    Correct
    Wrong
  • 2
    Low temperature and high pressure
    Correct
    Wrong
  • 3
    High temperature and low pressure
    Correct
    Wrong
  • 4
    High temperature and high pressure
    Correct
    Wrong
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Answer : 3. "High temperature and low pressure "
Explanation :

A real gas can behave as an ideal gas if volume of molecule is negligible and interaction between molecule is negligible. This will happen if number of molecule per unit volume is very small. This is only possible at high temperature and low pressure.

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.

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