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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. A catalyst is a substance which

  • increases the activation energy
  • increases the rate of reaction and increases the equilibrium concentration of products
  • changes the equilibrium of a reaction so that the concentration of the product increases
  • hastens the attainment of equilibrium

Answer: Option D

2. Biogas majorly contains ?

  • Ethane
  • Methane
  • Hydrogen
  • CO

Answer: Option B

3. The aqueous solution of which acids is called Vinegar ?

  • Acetic acid
  • Hydrochloric acid
  • Citric acid
  • Oxalic acid

Answer: Option A

4. The metallurgical process in which a metal is obtained in a fused state is called ?

  • roasting
  • calcinations
  • smelting
  • froth floatation

Answer: Option C

5. Which of the following gas is used in cigarette lighters ?

  • Butane
  • Propane
  • Methane
  • Ethane

Answer: Option A

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