Physics Questions Practice Question and Answer

Q:

A light bulb working on an 18 V battery draws a current of 3 A. What will be the resistance of the bulb?

585 0

  • 1
    6 Ω
    Correct
    Wrong
  • 2
    2 Ω
    Correct
    Wrong
  • 3
    4 Ω
    Correct
    Wrong
  • 4
    3 Ω
    Correct
    Wrong
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Answer : 1. "6 Ω"
Explanation :

An electric bulb running on 18 V battery draws 3A of electric current. The resistance of the bulb will be 6 Ω.

Q:

In which year did Albert Einstein predict a new state of matter, the Bose-Einstein condensate (BEC), based on a quantum formulation by the Indian physicist Satyendra Nath Bose?

261 0

  • 1
    1935
    Correct
    Wrong
  • 2
    1924
    Correct
    Wrong
  • 3
    1930
    Correct
    Wrong
  • 4
    1919
    Correct
    Wrong
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Answer : 2. "1924"
Explanation :

1. In which year did Albert Einstein predict a new state of matter, Bose-Einstein condensate (BEC) in 1924, based on the quantum formulation given by Indian physicist Satyendra Nath Bose?

2. Bose–Einstein condensate (BEC) is a state of matter in which a group of boson particles are in the same quantum state.

Q:

Which scientist suggested that the magnet must exert an equal and opposite force on the current-carrying conductor?

284 0

  • 1
    Michael Faraday
    Correct
    Wrong
  • 2
    Andre Marie Ampere
    Correct
    Wrong
  • 3
    Joseph Henry
    Correct
    Wrong
  • 4
    William Gilbert
    Correct
    Wrong
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Answer : 2. "Andre Marie Ampere "
Explanation :

1. French scientist Andre-Marie Ampère suggested that a magnet should also exert an equal and opposite force on a current-carrying conductor.

2. A current-carrying wire has its own magnetic field.

3. A current-carrying wire attracts a magnetic material like a normal bar magnet.

4. When the current is withdrawn or the switch is closed, there is no magnetic effect in that case.

5. This phenomenon was called the magnetic effect of current.

Q:

Identify the correct statement.

241 1

  • 1
    The resistance of a wire depends on the length and density of the wire.
    Correct
    Wrong
  • 2
    Specific resistance is the same for all conductors.
    Correct
    Wrong
  • 3
    Resistance of a wire depends on the length and cross-section of the wire.
    Correct
    Wrong
  • 4
    Specific resistance is dependent on the cross-sectional area of the wire.
    Correct
    Wrong
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Answer : 3. "Resistance of a wire depends on the length and cross-section of the wire."
Explanation :

1. Resistance of a wire depends on the length and cross-section of the wire.

Q:

Mechanical energy is the sum of potential energy and ______ energy.

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  • 1
    kinetic
    Correct
    Wrong
  • 2
    heat
    Correct
    Wrong
  • 3
    electrical
    Correct
    Wrong
  • 4
    chemical
    Correct
    Wrong
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Answer : 1. "kinetic"
Explanation :

1. Mechanical energy is a combination of kinetic energy and potential energy.

2. Mechanical energy is defined as the sum of kinetic energy and potential energy used to do work on an object.

3. Mechanical energy is the form of energy that is related to the position and motion of an object.

Q:

What is the correct order of radiations in descending order of frequencies?

217 0

  • 1
    Infrared > Microwaves > Radio waves > X-rays
    Correct
    Wrong
  • 2
    Radio waves > X-rays > Microwaves > Infrared
    Correct
    Wrong
  • 3
    X-rays > Infrared > Microwaves > Radio waves
    Correct
    Wrong
  • 4
    Infrared > Microwaves > X-rays > Radio waves
    Correct
    Wrong
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Answer : 3. "X-rays > Infrared > Microwaves > Radio waves"
Explanation :

The correct order of radiations is in descending order of frequencies.

 X-rays > Infrared > Microwaves > Radio waves

Q:

In 1962, who published 'The History of Ocean Basins', which outlined the theory of how tectonic plates could move, later called 'sea floor spreading'?

426 0

  • 1
    George Edward Backus
    Correct
    Wrong
  • 2
    Alfred Wegener
    Correct
    Wrong
  • 3
    Louis Bauer
    Correct
    Wrong
  • 4
    Harry Hammond Hess
    Correct
    Wrong
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Answer : 4. "Harry Hammond Hess"
Explanation :

1. In 1962, Harry Hammond Hayes published 'The History of Ocean Basins'.

2. In this, the theory of plate tectonics was outlined and which was later also known as 'ocean bottom spreading'.

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?

185 0

  • 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.

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