Science (Practice Test-3)

1. Which of them are liquid elements?

  • CI
  • Br
  • Na
  • W
Answer
Br

2. Submarine is based on-

  • Newton’s law
  • Archmedies law
  • Low of Einistein
  • Pascal’s law
Answer
Archmedies law

3. The ratio of velocity of two bodies is 1 : 4, what will be the ratio of its kinetic energies.

  • 1 : 4
  • 1 : 8
  • 4 : 1
  • 1 : 2
Answer
1 : 8

4. The temprature of the surface of the sun is-

  • 600° C
  • 600° K
  • 60,000° C
  • 600°
Answer
600° C

5. Rusting in iron is-

  • Oxydation
  • Addition
  • Substitution
  • Polymerisation
Answer
Oxydation

6. Which of the following moleculer contains a double bond?

  • N₂
  • C₂H₄
  • C₂
  • CH₄
Answer
C₂H₄

7. Common salt can be obtained from?

  • Rock salt
  • Salt lake
  • Rain water
  • Lime stone
Answer
Rock salt

8. The process for the change of a solid directly into its vapour is called ?

  • Equaporation
  • Condensation
  • Sublimation 
  • Boiling point
Answer
Sublimation

9. Which of the following is a compound?

  • Steel
  • Brass
  • lodine
  • Iron Solphide
Answer
Iron Solphide

10. Which industry utilises sodium silicate ?

  • Soap industry
  • Fertilizer industry 
  • Cement industry
  • Cosmetic industry
Answer
Cement industry