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questions & answers.
Q1.
Fill in the blanks:
- The matter is made up of ______________.
- The state of matter composed of atoms packed tightly together is known as ______________.
- When heat is liberated by matter, the energy of its molecules ______________ and they come closer.
- Solids have the ______________ intermolecular space of all the states of matter.
- The temperature at which a gas changes into its liquid state is called the ______________.
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Answer:
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- molecules
- Solid
- decreases
- least
- condensation
Q2.
State whether the following statements are true (T) or false (F). Correct the false statements:
- Even the basic unit of human body, the cell is made up of atoms only.
- Liquids have a fixed shape and a definite volume.
- When the heat is supplied to the matter, its molecules gain energy and start vibrating vigorously.
- During the process of evaporation, the liquids release heat from the body and causes the cooling of the body.
- Camphor is an example of sublimate.
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Answer:
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- True
- False
Liquids have a definite volume but not a fixed shape. - True
- True
- True
Q3.
Choose the correct option:
- The process that involves the change of state from liquid to its gaseous state at any temperature below its boiling point is called :
- The size of the molecules is of the order of :
- On cooling down a substance, there is a loss of heat and the kinetic energy of its molecules :
- The wetting of the glass is an example of :
- During the change of state from solid to liquid :
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Answer:
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- (b) evaporation
- (d) 10-8 to 10-10 metre
- (b) decreases
- (c) force of adhesion
- (b) heat is absorbed
Q4.
Match the columns:
| Column A | Column B |
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|
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Answer:
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- (b) Liquid
- (e) Gas
- (d) Solid
- (c) Dry ice
- (a) Wax
Q5.
Why do we smell hot food from a distance? Give reason.
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Answer:
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