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Matter in Our Surrounding Test - 32

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Matter in Our Surrounding Test - 32
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  • Question 1
    1 / -0
    A solid is a state of matter that has 
    Solution
    In solids the molecules are very closely packed and therefore the intermolecular distances are very little. 
    The intermolecular force is inversely proportional to the intermolecular distance. Therefore, when the distances are very small the forces of attraction will be very high. Correct answer is option $$C$$. 
  • Question 2
    1 / -0
    Which of the following is a property of liquids?
    Solution
    Liquids are not malleable or rigid. The do not have a definite shape but have a definite volume. They can flow as their molecules tend to spread out because of the less inter-particle forces of attraction.
  • Question 3
    1 / -0
    All kinds of matter
    Solution
    Matter is the one that occupy space and has mass.
    Hence, Option "A" is the correct answer.
  • Question 4
    1 / -0
    A kind of matter which can sublime is:
    Solution
    Iodine is a sublimable substance, it changes directly into vapour, from solid on heating, without changing into liquid.
    Hence, Option "D" is the correct answer.
  • Question 5
    1 / -0
    Select the correct alternative
    The molecules can move freely anywhere in_____ state.
    Solution
    The atoms and molecules in gaseous are much more spread out than in solids or liquids. They are having the largest inter-particle space between them. They can move freely at high speeds in all directions. Molecules in solid and liquid states can not move freely anywhere.
    Hence, option $$A$$ is correct.
  • Question 6
    1 / -0
    The gaseous state has
    Solution
    Gases do not have a fixed shape and volume because particles in gases have a low force of attraction and have large intermolecular spaces, which enables the particles to move freely. Hence option B is correct.
  • Question 7
    1 / -0
    The temperature of melting ice remains constant for some time even if we continue to supply heat to the beaker. This is because of the heat energy ?
    Solution
    the temperature remains constant during boiling of water even though heat is supplied constantly because all the heat energy provided is used in changing the state of water from liquid to gas is water vapor therefore all the heat energy provided increases the kinetic energy of the particles and temperature does not increase.
  • Question 8
    1 / -0
    What is the change in substance when temperature is increased?
    Solution
    When the temperature of a state of matter is increased, heat is absorbed by the substance in the form of energy. The kinetic energy of the molecules of the substance increase. The molecules experience a lot of vibration and occupy more space. As a result, a substance expands, and its volume increases.
  • Question 9
    1 / -0
    What is incorrect about gas?
    Solution
    In gases, inter-molecular forces are minimum as compared to their liquid and solid forms.
  • Question 10
    1 / -0
    The heat gained or lost during a change of state from solid to liquid or from liquid to solid is called the latent heat of .......
    Solution
    The heat associated with the melting of a solid or freezing of a liquid is called the latent heat of fusion. This heat remains hidden as no rise in temperature is observed on its absorption until the phase change is completed, so it is called latent, which means hidden.
    Latent heat of vaporisation is the heat associated with vaporisation of a liquid or condensation of vapour. 
    Freezing and condensation are processes by which liquid changes to ice and gas changes to liquid respectively. Hence option A is correct.
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