Physics Practice Question and Answer

Q:

Which among the following instruments is used to measure either direct or alternating electric current?

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  • 1
    Wattmeter
    Correct
    Wrong
  • 2
    Hygrometer
    Correct
    Wrong
  • 3
    Ammeter
    Correct
    Wrong
  • 4
    Pyrometer
    Correct
    Wrong
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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:

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:

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:

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"

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