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Matter in Our Surrounding Test - 24

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Matter in Our Surrounding Test - 24
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  • Question 1
    1 / -0
    Which one of the following statements related to the process of evaporation is incorrect?
    Solution
    Evaporation is a type of vaporization which occurs on the surface of the liquid. The evaporation process can occur at a temperature below the boiling point. So by evaporation, only the liquid molecules on the surface get converted to water vapour.

    Hence, the correct option is B\text{B}
  • Question 2
    1 / -0
    The five basic elements that the matter is thought to be made of is:
    Solution
    The five basic elements are air, earth, sky, water, and fire. All the body in this universe is made up of these. Each one has its own representation.
    Hence, option D is the correct answer.
  • Question 3
    1 / -0
    Assertion: We feel cold on touching the ice.
    Reason: Ice is a solid form of water.
    Solution
    We feel cold on touching the ice because the heat from our body being higher in amount moves to the ice through our skin (by thermal condition ) in order to attain thermal equilibrium between the ice and the body. So the assertion is correct.
    Ice is a solid form of water is also a correct statement but it is not the correct explanation of the assertion.
    Option, BB is correct.
  • Question 4
    1 / -0
    Gases are liquefied under ______.
    Solution
    Gases are liquefied under high pressure as it helps in bringing the particles closer and low temperature reduces kinetic energy thereby keeping the particles again near to each other and it results in forming liquid.
    Hence, option BB is correct.
  • Question 5
    1 / -0
    The smell of the deodorant sprayed  on one side of the room travels to the other side of the room. This proves that:
    Solution
    The particles of matter are continuously moving. This helps the scented particles to move from one side of the room to the other.
  • Question 6
    1 / -0
    The smell of hot sizzling food reaches you several meters away, but to get the smell of the cold food you have to go close. Which property of matter does this activity show?
    Solution
    Particles of matter are continuously moving from one end to another, thereby transferring smell from one place to another. The reason why the smell of hot sizzling food goes farther than cold food is because the kinetic energy of the particles of matter increases with the increase in temperature. So, particles in the smell of hot food have a higher kinetic energy and hence, move farther than those of cold food.
  • Question 7
    1 / -0
    Particles of gaseous matter are ___________.
    Solution
    Particles of gaseous matter are continuously moving. 
    For example, the smell of deodorant travels in the whole room if it is used on one side of the room.
    Hence, the correct option is C.
  • Question 8
    1 / -0
    The smell of food transfers across the room due to ____________.
    Solution
    The smell of food is nothing but the molecules of food present in the gaseous state. Since these particles intermix and are in continuous motion, they spread across the room through the air.
  • Question 9
    1 / -0
    Which of the following is a surface phenomenon?
    Solution
    BoilingBoiling is a bulk phenomenon because all molecules gain energy on heating.

    EvaporationEvaporation is a surface phenomenon as the molecules of the surface gets sufficient energy to overcome the force of attraction which will help in converting to the vapour phase.

    DilutionDilution is also a bulk phenomenon as the volume of solution increases throughout the bulk of the solution.

    So, the correct answer is (B).
  • Question 10
    1 / -0
    What happens when ink is dropped in water?
    Solution
    When ink is dropped in water, it evenly spreads in the water due to the principle of diffusion. This happens because water as well as the ink particles (molecules) are in continuous random motion.

    Hence, the correct option is A.
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