MCQs 2 on MATTER IN OUR SURROUNDINGS) => 9th Class

solve online MCQs on Chemistry(MATTER IN OUR SURROUNDINGS) => 9th Class for competitve examinations like CBSE Neet, CBSE Board, CSIR NET, GRE etc.

1. At higher altitudes the boiling points of liquids

• Increases
• Decreases
• Remains the same
• Increases then decreases

2. During evaporation particles of a liquid change into vapours :

• From the surface
• From the bulk
• From the bottom
• From all over the liquid

3. In which phenomenon does water change into water vapour below its boiling point:

• Boiling
• Evaporation
• Freezing
• Sublimation

4. We get the smell of hot food in the kitchen outside the house because of:

• Boiling
• Evaporation
• Sublimation
• Diffusion

5. which are the favourable conditions for liquefaction of petroleum gas:

• High pressure, high temperature
• Low pressure, low temperature
• High pressure, low temperature
• Low pressure, high temperature

6. latent heat of vapourisation is used to:

• Overcome forces of attraction between the liquid particles at the boiling point
• Overcome forces of attraction between solid particles at the freezing point
• Increase the kinetic energy of particles in the liquid state
• Increase the kinetic energy of the particles in the vapour phase

7. Which of the following has highest density?

• Kerosine
• Water
• Iron
• Wood

8. Dry ice on heating produces:

• Liquid CO₂
• Gas CO₂
• Liquid water
• Water vapour

9. Particles move randomly in:

• Definite volume and definite shape
• Water
• Nitrogen
• Dry ice

10. When we blow air into the balloon it inflates because:

• Air particles diffuse into the balloon
• Air particles collide with the walls of the balloon and exert pressure on them
• Rubber is elastic in nature
• The temperature of air in the balloon increases

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