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PHYSICS [1 Mark Question Answer]

Matter · ICSE STD 8 (ICSE - English Medium). 12 questions.

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[1 Mark Question Answer]

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12 questions · timed · auto-graded

Question 11 Mark
Why does the size of naphthalene balls decrease when left open?
Answer
When naphthalene balls are left open, due to sublimation they change to vapours and their size decreases.
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Question 21 Mark
Water in a dish evaporates faster than in a bottle. Give reason.
Answer
Rate of evaporation is more when the area of the exposed surface is more. As area exposed in a dish is more, evaporation is also more.
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Question 31 Mark
Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.
Answer
Rate of evaporation is directly proportional to temperature. Thus, the rate of evaporation is higher on a warm day i.e. hot day than cold day having low temperature and clothes dry soon on a warm day.
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Question 41 Mark
What is evaporation?
Answer
$\text{EVAPORATION}$ : “The change of state of a liquid to vapour at all temperatures from the surface of the liquid is called evaporation.”
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Question 51 Mark
State the boiling point of water.
Answer
BOILING POINT OF WATER : “Is that constant temperature at which water starts $($BOILING$)$ changing from water to steam $($vapours$)$”.
It is $100^\circ C$ for water.
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Question 61 Mark
State the melting point of ice.
Answer
MELTING POINT OF ICE : “Is the constant temperature at which it starts $($melting$)$ changing from ice to water.”
It is $0^\circ C$ for ice.
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Question 71 Mark
Name the processes involved in two cases.
Answer
The process involved in two cases is vaporization or boiling.
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Question 101 Mark
Explain the terms boiling point.
Answer
BOILING POINT : “The temperature at which a liquid starts changing into vapours or gas at constant temperature is called its BOILING POINT.”
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Question 111 Mark
Explain the term Melting Point.
Answer
It can be defined as the fixed temperature at which a solid start changing to its liquid state is Melting Point
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Question 121 Mark
Explain the term Melting.
Answer
The physical process that results in the transition of a substance from the solid$-$state to the liquid state on heating at a fixed temperature is called Melting.
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[1 Mark Question Answer] - PHYSICS STD 8 Questions - Vidyadip