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PHYSICS [1 Mark Question Answer]

Heat Transfer · ICSE STD 8 (ICSE - English Medium). 11 questions.

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[1 Mark Question Answer]

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11 questions · timed · auto-graded

Question 51 Mark
Which of the following will expand more, when heated to the same temperature : $(a)$ solid $(b)$ liquid and $(c)$ gas?
Answer
Gas will expand more as the inter$-$molecular force of attraction in gas molecules is least and $K.E$. is maximum.
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Question 61 Mark
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.
Answer
When the bottle is heated, the air in it expands and the solubility of gases in it decreases which escapes from water in the form of bubbles.
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Question 71 Mark
A cement floor is laid in small pieces with gaps in between.
Answer
In summer when the temperature rises small pieces of cement expand and to allow expansion gaps are left between small pieces.
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Question 81 Mark
A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.
Answer
By pouring hot water on the neck of the bottle, the neck expands and stuck glass stopper can easily be removed.
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Question 101 Mark
What do you understand by thermal expansion of a substance?
Answer
The expansion of a substance on heating is called the thermal expansion of the substance.
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Question 111 Mark
Why does bubbles appear when a liquid is heated?
Answer
When the liquid is heated formation of vapours takes place which appears in the form of bubbles.
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[1 Mark Question Answer] - PHYSICS STD 8 Questions - Vidyadip