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:

Identify the correct statement.

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  • 1
    Newton is a unit of force.
    Correct
    Wrong
  • 2
    Newton is a unit of power.
    Correct
    Wrong
  • 3
    Joule is a unit of force.
    Correct
    Wrong
  • 4
    Joule is a unit of power.
    Correct
    Wrong
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Answer : 1. "Newton is a unit of force."
Explanation :

1. Newton is the SI unit of force. It is a unit force that causes an acceleration of one meter per second on one kilogram of mass.

- Force can be defined as:
 Force =Mass x Acceleration

2. Joule is the SI unit of energy and work. It is the unit work done by one Newton force over a distance of one meter.

- Energy can be defined as:
 Energy = Work x Time

Q:

Who found an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles in 1911?

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  • 1
    Fermi and Meitner
    Correct
    Wrong
  • 2
    Geiger and Nuttall 
    Correct
    Wrong
  • 3
    Chadwick and Lawrence
    Correct
    Wrong
  • 4
    Soddy and Aston
    Correct
    Wrong
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Answer : 2. "Geiger and Nuttall "
Explanation :

In 1911, Geiger and Nuttall discovered an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles.

Q:

Match the columns.

Column - A                         Column-B

I. Electric current               a. Henry

II. Potential difference       b. Farad

III. Gapacitance                 c. Volt

IV. inductance                    d. Ampere

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  • 1
    i-a, ii-b, iii-c, iv-d
    Correct
    Wrong
  • 2
    i-b, ii-a, iii-c, iv-d
    Correct
    Wrong
  • 3
    i-d, ii-c, iii-b, iv-a
    Correct
    Wrong
  • 4
    i-a, ii-c, iii-b, iv-d
    Correct
    Wrong
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Answer : 3. "i-d, ii-c, iii-b, iv-a"
Explanation :

The columns are a correct match.

I. Electric current            - Ampere

II. Potential difference    -   c. Volt

III. Gapacitance               -   b. Farad   

IV. inductance                 -   a. Henryd.

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:

A 40kVA transformer has core loss of 400 W & full load copper loss of 800 W. The proportion of full load at maximum efficiency is -

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  • 1
    50%
    Correct
    Wrong
  • 2
    62.3%
    Correct
    Wrong
  • 3
    70.7%
    Correct
    Wrong
  • 4
    100%
    Correct
    Wrong
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Answer : 3. "70.7%"

Q:

The splitting of white light into its component colours is called ______. 

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  • 1
    refraction
    Correct
    Wrong
  • 2
    reflection
    Correct
    Wrong
  • 3
    scattering
    Correct
    Wrong
  • 4
    Dispersion
    Correct
    Wrong
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Answer : 4. "Dispersion"

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"

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