Physics Questions Answers

• 22. Who discovered Atom ?

  1. Madam Curie
  2. James Chadwick
  3. Rutherford
  4. John Dalton

  Answer And Explanation

  Answer: Option D

  Explanation:

  John Dalton discovered Atom in 1808,
  
  Madam Curie discovered Radium in 1898,
  
  James Chadwick discovered Neutron in 1932,
  
  Rutherford discovered Proton in 1919.

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• 23. Who discovered Diode Bulb ?

  1. Henry Becquerel
  2. Sir J.S. Fleming
  3. Lee De Forest
  4. Archemedes

  Answer And Explanation

  Answer: Option B

  Explanation:

  Sir J.S. Fleming discovered Diode Bulb in 1904,
  
  Lee De Forest discovered Triode Bulb in 1906,
  
  Archemedes discovered laws of floatation in 1827,
  
  Henry Becquerel discovered Radioactivity in 1896.
  

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• 24. Radiocarbon is produced in the atmosphere as a result of

  1. collision between fast neutrons and nitrogen nuclei present in the atmosphere
  2. action of ultraviolet light from the sun on atmospheric oxygen
  3. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
  4. lightning discharge in atmosphere

  Answer And Explanation

  Answer: Option A

  Explanation:

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• 25. The absorption of ink by blotting paper involves

  1. capillary action phenomenon
  2. viscosity of ink
  3. siphon action
  4. diffusion of ink through the blotting

  Answer And Explanation

  Answer: Option A

  Explanation:

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• 26. Siphon will fail to work if

  1. both its limbs are of unequal length
  2. the temperature of the liquids in the two vessels are the same
  3. the level of the liquid in the two vessels are at the same height
  4. the densities of the liquid in the two vessels are equal

  Answer And Explanation

  Answer: Option C

  Explanation:

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• 27. Nuclear sizes are expressed in a unit named

  1. Fermi
  2. Angstrom
  3. Newton
  4. Tesla

  Answer And Explanation

  Answer: Option A

  Explanation:

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• 28. Light year is a unit of

  1. Time
  2. Light
  3. Distance
  4. Intensity of light

  Answer And Explanation

  Answer: Option C

  Explanation:

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