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MCQs

Total Questions : 30 | Page 2 of 3 pages
Question 11. At Mount Everest, the water boils at
  1.    100 °C
  2.    90 °C
  3.    80 °C
  4.    70 °C
 Discuss Question
Answer: Option D. -> 70 °C
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 12. The movement of molecules from higher concentration to lower concentration is called
  1.    diffusion
  2.    concentration
  3.    effusion
  4.    mobility
 Discuss Question
Answer: Option A. -> diffusion
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 13. Solids whose atoms arrange themselves in different forms are
  1.    isotopes
  2.    crystals
  3.    allotropes
  4.    amorphous
 Discuss Question
Answer: Option C. -> allotropes
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 14. The barometer is invented by
  1.    Galileo
  2.    Robert Boyle
  3.    Charles
  4.    Torricelli
 Discuss Question
Answer: Option D. -> Torricelli
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 15. The melting and freezing of a substance occurs as
  1.    same temperature
  2.    more than melting point
  3.    more than freezing point
  4.    less than boiling point
 Discuss Question
Answer: Option A. -> same temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 16. If the liquid is heated to increase the kinetic energy then the liquid will
  1.    evaporate slowly
  2.    evaporate faster
  3.    not evaporate
  4.    boil
 Discuss Question
Answer: Option B. -> evaporate faster
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 17. The process in which the vapor molecules are recaptured by the molecules at the liquid surface is called
  1.    evaporation
  2.    sublimation
  3.    condensation
  4.    boiling
 Discuss Question
Answer: Option C. -> condensation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 18. In graphite, the carbon atoms are arranged in layers of
  1.    pentagonal arrays
  2.    heptagonal arrays
  3.    octagonal arrays
  4.    hexagonal arrays
 Discuss Question
Answer: Option D. -> hexagonal arrays
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 19. 1 atmospheric pressure is equal to
  1.    100.345 Pa
  2.    760 kPa
  3.    101.325 kPa
  4.    1.01325 mmHg
 Discuss Question
Answer: Option C. -> 101.325 kPa
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 20. A gas that shields living things on the surface of the earth from harmful UV radiation is
  1.    N2
  2.    SO2
  3.    O2
  4.    O3
 Discuss Question
Answer: Option D. -> O3
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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