NCERT Class – 9 Science Solution: Chapter 1 Matter in Our Surroundings-Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Multiple Choice Questions

Question 1

Which one of the following sets of phenomena would increase on raising the temperature?

  1. Diffusion, evaporation, compression of gases
  2. Evaporation, compression of gases, solubility
  3. Evaporation, diffusion, expansion of gases
  4. Evaporation, solubility, diffusion, compression of gases

Answer: C

EXpansion of Gases

Question 2

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

  1. Low temperature, low pressure
  2. High temperature, low pressure
  3. Low temperature, high pressure
  4. High temperature, high pressure

Answer: C

Question 3

The property to flow is unique to fluids. Which one of the following statements is correct?

  1. Only gases behave like fluids
  2. Gases and solids behave like fluids
  3. Gases and liquids behave like fluids
  4. Only liquids are fluids

Answer: C

Question 4

During summer, water kept in an earthen pot becomes cool because of the phenomenon of

  1. Diffusion
  2. Transpiration
  3. Osmosis
  4. evaporation

Answer: D

Question 5

A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?

  1. Water, air, wind
  2. Air, sugar, oil
  3. Oxygen, water, sugar
  4. Salt, juice, air

Answer: C

Question 6

On converting and to kelvin scale, the correct sequence of temperature will be

Answer: A

Question 7

Choose the correct statement of the following

  1. Conversion of solid into vapours without passing through the liquid state is called vapourisation.
  2. Conversion of vapours into solid without passing through the liquid state is called sublimation.
  3. Conversion of vapours into solid without passing through the liquid state is called freezing.
  4. Conversion of solid into liquid is called sublimation.

Answer: B