CBSE Questions for Class 9 Chemistry Matter In Our Surroundings Quiz 3 - MCQExams.com

Which of the following statements is/are true about matter?
  • Matter is made up of particles.
  • The particles are very small in size.
  • Particles of matter have space between them.
  • All of these.
A thermometer is inserted into a beaker filled with ice at $$0^{\circ}C$$. The beaker is heated slowly. The temperature does not rise for some time. This is because:
  • ice is very cold
  • heat was used for changing ice at $$0^{\circ}C$$ to water at $$0^{\circ}C$$
  • the density of water is more than ice
  • the density of water is less than the ice
Which of the following energy is absorbed during the change of state of a substance?
  • Specific heat
  • Latent heat
  • Heat capacity
  • Heat of solution
Which one will not increase the rate of evaporation of a liquid?
  • Increase in temperature
  • Increase in humidity
  • Increase in surface area
  • Increase in wind speed
The temperature remains constant during melting and all the ice changes into water. The enthalpy change associated with this process is due to _____________.
  • latent heat of fusion
  • latent heat of vaporisation
  • latent heat of evaporation
  • latent heat of sublimation
The latent heat of vaporisation of water is:
  • $$2.25\times 10^6 J/kg$$
  • $$2.25\times 10^8 J/kg$$
  • $$2.25\times 10^4 J/kg$$
  • $$2.25\times 10^{-6} J/kg$$
During evaporation of liquid,  ___________.
  • the temperature of the liquid falls
  • the temperature of the liquid rises
  • the temperature of the liquid remains unchanged
  • none of the above
Crystallisation technique is better than simple evaporation technique as __________.
  • some solids get evaporated with solvent during evaporation.
  • some solids decompose or some may get charred on heating to dryness.
  • some impurities may remain dissolved in the solution even after filtration, which on evaporation contaminate the solid.
  • both (B) and (C).
Which of the following statements is incorrect?
  • Melting and freezing point of a substance are the same.
  • Evaporation of liquid takes place only at its boiling point.
  • Pure water has no taste.
  • Water allows sunlight to pass through it.
Why does the boiling point of water decrease at higher altitudes?
  • Atmospheric pressure is low at higher altitudes.
  • Temperature is low at higher altitudes.
  • Atmospheric pressure is high at higher altitudes.
  • None of the above.
Heat of fusion is the process of conversion of:
  • liquid into gas
  • solid into gas
  • solid into liquid
  • liquid into solid
Rinku and Pinku had half day schools during summer. They used to go to school by autorickshaw. They observed that the auto driver covered the top of the vehicle by some mats and sprinkled water on them regularly, which keeps it cool. Which of the following phenomena is involved here?
  • Condensation
  • Evaporation
  • Sublimation
  • Diffusion
Liquids can be poured easily whereas solids cannot be pour because of:
  • less intermolecular forces of attraction
  • negligible intermolecular space
  • vibratory movement of molecules
  • all the above
Drinking of hot tea from a saucer preferred to a cup, due to:
  • Surface area
  • Material of the saucer
  • Thermal conductivity
  • Colour
Which among the following statements is true?
  • The rate of evaporation in a coastal area is less because of high humidity
  • The rate of evaporation in a coastal area is more because of presence of water bodies
  • The rate of evaporation is independent of humidity
  • The rate of evaporation is directly proportional to humidity
Maximum intermolecular force of attraction exists in:
  • bromine
  • Nitrogen
  • oxygen
  • copper
An earthenware keeps water cool but a metallic vessel does not because: 
  • earthenware has pores.
  • metals are good thermal conductors
  • metal wares are heat resistant.
  • earthen wares are impervious.
Which condition out of the following will increase the evaporation of water?
  • Increase in temperature of water
  • Adding common salt to water
  • Less exposed surface area of water
  • Decrease in temperature of water
Water stored in earthen pots become cool in summer because of:
  • condensation
  • evaporation
  • precipitaion
  • None of these
Inter-particle spaces are minimum in:
  • gases
  • liquids
  • solids
  • gases and solids
Which is more effective in cooling?
  • Ice at $$0^0 C$$
  • Water at $$0^0 C$$
  • Water at $$100^0 C$$
  • Ice at $$100^0 C$$
Early philosophers classified matter in the form of __________ basic elements.
  • one
  • two
  • three
  • five
Which one of the following factors do not affect the rate of evaporation?
  • Temperature of the liquid
  • Humidity of the surrounding air
  • Depth of the liquid
  • Surface of the liquid
Evaporation occurs only:
  • after boiling
  • after extreme cooling
  • at the surface of a liquid
  • if boiling occurs at atmospheric pressure
Which one of the following statements related to the process of evaporation is incorrect?
  • Evaporation occurs at any temperature.
  • Evaporation takes place within the liquid not on the surface.
  • Temperature may change during evaporation.
  • No bubbles are formed in the liquid during evaporation.
The five basic elements that the matter is thought to be made of is:
  • earth, sky, land, water, air
  • earth, sky, air, water, ice
  • earth, ice, sky, water, fire
  • air, earth, sky, fire, water
Assertion: We feel cold on touching the ice.
Reason: Ice is a solid form of water.
  • If both assertion and reason are true and the reason is a correct explanation of the assertion.
  • If both assertion and reason are true, but reason is not a correct explanation of the assertion.
  • If the assertion is true, but reason is false.
  • If both the assertion and reason are false.
$$1\ gram$$ of ice which on melting forms $$1 gram$$ of water absorbs $$80\ calories$$ of energy.
  • True
  • False
The rate of evaporation decreases with an increase in _________.
  • humidity
  • temperature
  • wind speed
  • surface area
A diver is able to cut through water in a swimming pool. Which property of matter does this activity show?
  • The particles of matter are extremely small.
  • The particles of matter have spaces between them.
  • The particles of matter are in stationary state.
  • The particles of matter attract each other.
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