CBSE Class 9 Science Matter In Our Surroundings MCQs Set 02

Question: As solid melts to form liquid:
(a) All of the above
(b) Inter particle distance increases
(c) Inter molecular forces of attraction decreases
(d) Compressibility increases 

Answer: A 

Question: When we blow air into the balloon it inflates because:
(a) Air particles collide with the walls of the balloon and exert pressure on them
(b) Air particles diffuse into the balloon
(c) Rubber is elastic in nature
(d) The temperature of air in the balloon increases 

Answer: A 

Question: Particles move randomly in:
(a) Water
(b) Nitrogen
(c) Sugar
(d) Dry ice 

Answer: B 

Question: Dry ice on heating produces:
(a) Gas CO₂
(b) Liquid CO₂
(c) Liquid water
(d) Water vapour 

Answer: A 

Question: Which of the following has highest density?
(a) Wood
(b) Kerosene
(c) Water
(d) Iron 

Answer: D 

Question: latent heat of vapourisation is used to:
(a) Overcome forces of attraction between the liquid particles at the boiling point
(b) Overcome forces of attraction between solid particles at the freezing point
(c) Increase the kinetic energy of particles in the liquid state
(d) Increase the kinetic energy of the particles in the vapour phase 

Answer: A 

Question: which are the favourable conditions for liquefaction of petroleum gas:
(a) Low pressure, high temperature
(b) High pressure, high temperature
(c) High pressure, low temperature
(c) Low pressure, low temperature 

Answer: C

Question: We get the smell of hot food in the kitchen outside the house because of:
(a) Diffusion
(b) Boiling
(c) Evaporation
(d) Sublimation

Answer: A 

Question: In which phenomenon does water change into water vapour below its boiling point:
(a) Sublimation
(b) Boiling
(c) Freezing
(d) Evaporation 

Answer: D 

Question: During evaporation particles of a liquid change into vapours :
(a) From the surface
(b) From the bulk
(c) From the bottom
(d) From all over the liquid

Answer: A 

Question: At higher altitudes the boiling points of liquids
(a) Decreases
(b) Increases
(a) Increases then decreases
(d) Remains the same

Answer: C

Question: Wet clothes are kept for drying. Which of the following does not help them in drying:
(a) Cooling the room
(b) Spreading it out
(c) Blowing wind over it
(d) Making the room a little warmer

Answer: A

Question: Which of the following describes a liquid state:
(a) Definite volume and no specific shape
(b) Definite volume and definite shape
(c) definite shape but no definite volume
(d) neither definite shape nor definite volume

Answer: A

Question: Evaporation of a liquid can take place:
(a) At all temperatures
(b) At its boiling point
(c) At its freezing point
(d) At a fixed temperature

Answer: A

Question: The conversion of solid to gas directly is called:
(a) Evaporation
(b) Sublimation
(c) Distillation
(d) Condensation

Answer: B

Question: The process of evaporation causes:
(a) Cooling
(b) Heating
(c) Dryness
(d) None of the above

Answer: A

Question: Which of the following substances will undergo sublimation?
(a) Sugar
(b) Common salt   
(c) Odonil
(d) Sand

Answer: C

Question: Which of the following has highest intermolecular forces of attraction?
(a) Iron metal
(b) Water at room temperature
(c) CO2 gas
(d) Ethyl alcohol 

Answer: A

Question: The boiling point of water is:
(a) 0K at atmospheric pressure
(b) 273K at atmospheric pressure
(c) 0oC at atmospheric pressure
(d) 101oC at atmospheric pressure 

Answer: D

Question: Which of the following is not characteristic of solid:
(a) High compressibility
(b) High Rigidity
(c) Regular Shape
(d) High density

Answer: A 

Question: The state of matter where matter is condensed is: 
(i) solid state 
(ii) liquid state  
(iii) gaseous state 
(a) (i) and (iii) (b) (ii) and (iii)
(c) (i) and (ii) (d) (i), (ii) and (iii). 

 Answer : (iii)