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

EASY

8th ICSE

IMPORTANT

Earn 100

State the boiling point of water.

Important Questions on Matter

EASY

8th ICSE

IMPORTANT

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

What is evaporation ?

MEDIUM

8th ICSE

IMPORTANT

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

State three factors which affect the rate of evaporation of a liquid.

MEDIUM

8th ICSE

IMPORTANT

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

Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.

MEDIUM

8th ICSE

IMPORTANT

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

Water in a dish evaporates faster than in a bottle. Give reason.

MEDIUM

8th ICSE

IMPORTANT

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

Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles ?

MEDIUM

8th ICSE

IMPORTANT

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

A certain quantity of water is heated from

20 ° C

to

100 ° C

. Its temperature is recorded after each

1

minute. The observations are:

Time (in minute)	Temperature (in $° C$ )
$0$	$20$
$1$	$30$
$2$	$40$
$3$	$50$
$4$	$60$
$5$	$70$
$6$	$80$
$7$	$90$
$8$	$100$
$9$	$100$
$10$	$100$
$11$	$100$
$12$	$100$

What conclusion do you draw from the above table about the boiling point of water ? Explain.

MEDIUM

8th ICSE

IMPORTANT

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

Why is cooling produced on evaporation of a liquid?

MEDIUM

8th ICSE

IMPORTANT

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

Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.