Physics Questions Answers
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22. Who discovered Atom ?
- Madam Curie
- James Chadwick
- Rutherford
- 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. -
23. Who discovered Diode Bulb ?
- Henry Becquerel
- Sir J.S. Fleming
- Lee De Forest
- 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
- collision between fast neutrons and nitrogen nuclei present in the atmosphere
- action of ultraviolet light from the sun on atmospheric oxygen
- action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- lightning discharge in atmosphere
Answer And Explanation
Answer: Option A
Explanation:
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25. The absorption of ink by blotting paper involves
- capillary action phenomenon
- viscosity of ink
- siphon action
- diffusion of ink through the blotting
Answer And Explanation
Answer: Option A
Explanation:
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26. Siphon will fail to work if
- both its limbs are of unequal length
- the temperature of the liquids in the two vessels are the same
- the level of the liquid in the two vessels are at the same height
- 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
- Fermi
- Angstrom
- Newton
- Tesla
Answer And Explanation
Answer: Option A
Explanation:
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28. Light year is a unit of
- Time
- Light
- Distance
- Intensity of light
Answer And Explanation
Answer: Option C
Explanation: