Match the following: Column A Column B (a) Molecules (i) Water boils (b) 100 ° C (ii) Evaporation (c) 0 ° C (iii) Changes from solid to gas (d) At all temperatures (iv) Matter (e) Camphor (v) Water freezes

(a) Molecules - (iv) Matter Anything which occupies space and has mass is called matter. All forms of matter are composed of molecules. (b) 100 ο C - (i) Water boils The temperature at which liquid changes into vapour without further increase in temperature is called the boiling point of the liquid. The boiling point of water is 100 ο C . (c) 0 ο C - (v) Water freezes The temperature at which a liquid changes into solid without further decrease in temperature is called the freezing point of the liquid. The freezing point of water is 0 ο C . (d) At all temperatures - (ii) Evaporation The change of state from liquid to vapour at all temperatures from the surface of liquid is called evaporation. Evaporation takes place at all temperatures. (e) Camphor - (iii) Changes from solid to gas Sublimation is the process by which a solid when heated, directly changes into its vapour (gaseous state) without first changing into liquid. Camphor is a substance which exhibits sublimation. Column A Column B (a) Molecules (iv) Matter (b) 100 ° C (i) Water boils (c) 0 ° C (v) Water freezes (d) At all temperatures (ii) Evaporation (e) Camphor (iii) Changes from solid to gas

E M B I B E

Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

EASY

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IMPORTANT

Earn 100

At high altitudes water boils above $100 ° C$ .

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Important Questions on Matter

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

The melting point of ice is

0 ° C

.

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

Evaporation takes place at _____ temperature. (all/

100 ° C

)

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

_____ process is just reverse of melting. (Deposition/Freezing)

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

_____ is a process that involves direct conversion of a solid into its vapour on heating. (Freezing/Sublimation)

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

The temperature at which a solid converts into a liquid is called its _____. (boiling point/melting point)

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

The smallest unit of matter that exists freely in nature is called a _____. (quark/molecule)

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Concise Physics Middle School for Class 8>Chapter 1 - Matter>TEST YOURSELF>Q A

Match the following:

Column A	Column B
(a) Molecules	(i) Water boils
(b) $100 ° C$	(ii) Evaporation
(c) $0 ° C$	(iii) Changes from solid to gas
(d) At all temperatures	(iv) Matter
(e) Camphor	(v) Water freezes