Changes around us Worksheet-2
Fill in the blanks:
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Mercury is used in _________ for checking temperature.
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Cooling causes a material to ________.(contract/expand)
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The balloon _________, as the air inside the balloon contracts on cooling.
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Water contracts on cooling until it reaches the temperature of _____°C.
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The tyres are _________ to expand them.
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Digestion of food is a ________ change.
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Chopping of potatoes is a _________ change.
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A change that can be reversed is called a _________ change.
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A change where no new substances are formed is called a ___________ change.
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A change that cannot be reversed is called an __________ change.
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A change where new substances with different properties are formed is called a __________ change.
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The unit of work is ________.
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Mercury __________ when the bulb of the thermometer comes in contact with a hot object. (expands/contracts)
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When water is cooled from 4°C to 0°C, it__________. (expands/contracts)
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_________ expand the least while gases expand the most.
Answer Key:
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thermometer
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contract
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shrinks
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4/ four
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Heated
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chemical/ irreversible
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physical/ irreversible
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reversible
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physical
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irreversible
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chemical
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joule
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expands
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expands
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Solids