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The ejection of electrons when a metal surface is irradiated is known as

  • Black body radiation
  • Photoelectric effect
  • Zeeman effect
  • Atomic spectrum

Answer: Option B

Similar Questions :

1. Petroleum is found in ?

  • Marshy land
  • Metamorphic rocks
  • Igneous rock
  • Sedimentary rocks

Answer: Option D

2. pH of blood is ?

  • 10.4
  • 9
  • 7.4
  • 4

Answer: Option C

3. Permanent hardness of water is due to the presence of ?

  • Magnesium bicarbonate
  • Calcium bicarbonate
  • Sodium bicarbonate
  • Calcium sulphate

Answer: Option D

4. What is laughing gas ?

  • nitrous oxide
  • nitric oxide
  • nitrogen oxide
  • nitrogen peroxide

Answer: Option A

5. The high reactivity of fluorine is due to ?

  • small size of fluorine atom
  • its high electro negativity
  • availability of d-orbitals
  • strong F - F bond

Answer: Option B

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