Chapter 5: Physical States Of Matter Chemistry For High School - Grade 9(Chemistry ) Questions and Answers

Question 1. The process in which the solid changes directly into vapors without changing in the liquid state is called
  1.    condensation
  2.    evaporation
  3.    boiling
  4.    sublimation
Explanation:-
Answer: Option D. -> sublimation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. Conversion of a liquid to a gas at all temperatures is called
  1.    sublimation
  2.    evaporation
  3.    condensation
  4.    boiling
Explanation:-
Answer: Option B. -> evaporation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. The molecules of liquid which escape first have
  1.    highest kinetic energy
  2.    lowest kinetic energy
  3.    moderate kinetic energy
  4.    infinite kinetic energy
Explanation:-
Answer: Option A. -> highest kinetic energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. At constant pressure the average kinetic energy of gas molecules increases 2 times if
  1.    temperature is increased by 2 times
  2.    temperature is halved
  3.    no change in temperature
  4.    temperature remains constant
Explanation:-
Answer: Option A. -> temperature is increased by 2 times
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. The average kinetic energy of gas molecules is directly proportional to
  1.    T2
  2.    √T
  3.    T
  4.    2T
Explanation:-
Answer: Option C. -> T
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. The mathematical expression that describes Boyle's law is
  1.    PV = constant
  2.    V * constant = P
  3.    P * constant = V
  4.    V ⁄ P = constant
Explanation:-
Answer: Option A. -> PV = constant
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. For a certain reaction PV = 2 dm3 atm and volume is 4 dm3 then the corresponding pressure is
  1.    1 atm
  2.    4 atm
  3.    0.5 atm
  4.    2 atm
Explanation:-
Answer: Option C. -> 0.5 atm
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The temperature at which the solid starts melting is called
  1.    boiling point
  2.    freezing point
  3.    melting point
  4.    sublimating point
Explanation:-
Answer: Option C. -> melting point
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. On increasing the temperature of amorphous solid they
  1.    melt at specific temperature
  2.    soften gradually
  3.    break at specific temperature
  4.    boil at specific temperature
Explanation:-
Answer: Option B. -> soften gradually
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. The pressure that vapors apply on the surface of the liquid at equilibrium is called
  1.    torr
  2.    vapor pressure
  3.    liquid pressure
  4.    condensation
Explanation:-
Answer: Option B. -> vapor pressure
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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