CBSE Questions for Class 9 Chemistry Matter In Our Surroundings Quiz 8 - MCQExams.com

The beans are cooked earlier in pressure cooker, because:
  • B.P. increase with increasing pressure
  • B.P. decrease with increasing pressure
  • Extra pressure of pressure cooker, softens the beans
  • Internal energy is not lost while cooking is pressure cooker
Statement I : Evaporation causes cooling.
Statement II: Particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation.
  • Both statements I and II are true, statement II is correct explanation for statement I.
  • Both statements I and II are true, statement II is not the correct explanation for statement I.
  • Statement I is true and statement II is false.
  • Statement I is false and statement II is true.
The percentage of para hydrogen in ordinary hydrogen increases when?
  • Temperature is lowered
  • Temperature is increased
  • Pressure is increased and temperature is decreased
  • None
Water vapor contains a huge amount of stored energy known as
  • Latent heat
  • Solar energy
  • Stored heat
  • Mechanical energy
select the order of evaporation for water, alcohol, petrol, and kerosene oil. 
  • water > alcohol > kerosene oil > petrol
  • alcohol > petrol > water > kerosene oil
  • petrol > alcohol > water > kerosene oil
  • petrol > alcohol > kerosene oil > water
What is the common between three states of matter?
  • They are made up of small tiny particles.
  • They have a particular mass and can occupy space.
  • These three states have volume in it.
  • The atoms of these three states have force of attractions between them.
Which of the following is the BEST indicator of the actual amount of water vapour in the air?
  • Air temperature
  • Saturation vapour pressure
  • Relative humidity
  • Dew point temperature
The comparing gases with liquids, gases have _________ compressibility and _____________ density.
  • Greater , smaller
  • Greater; greater
  • smaller;smaller
  • smaller;greater
Which of the following statement is incorrect?
  • The particles of matter are very very small.
  • The particles of matter attract one another.
  • The particles of some of the matter are not moving constantly.
  • The particles of all the matter have spaces between them.
Solids retain their volume even when external pressure is applied. This property is called______
  • plasticity
  • incompressibility
  • fluidity
  • elasticity
The molecules move only within the boundary of 
  • liquids
  • gases
  • solids
  • none of the above
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