case /data -based (4 Marks)

Question 14 Marks

The picture shows trekkers at four different locations on a mountain.
$P, Q, R$ and $S$ are the four different locations.

$6.$ At which location will a trekker need maximum oxygen from the cylinder?
$A.$ P
$B.$ Q
$C.$ R
$D.$ S
$7.$ Why is it safer to breathe through the nose than through the mouth?
$8.$ Wearing a face mask prevents germs present in the air from entering our body.
What is another beneit of wearing a face mask?
$A.$ It prevents the drying of lips.
$B.$ It helps to reduce bad breath.
$C.$ It helps to keep the face warm.
$D.$ It prevents dust from entering the body.
$9.$ Which of these actions can cause air pollution?
Circle $‘Yes’$ or $‘No’$ for the correct response.

Can this cause air pollution?	$Yes$ or $No$
Using solar water heaters	$Yes/No$
Burning plastic wastes	$Yes/No$
Driving electric vehicles	$Yes/No$

$10.$ Which is the largest component of air?
$A.$ Oxygen
$B.$ Nitrogen
$C.$ Water vapour
$D.$ Carbon dioxide

Answer

$6. D. S$
$7.$ Mentions that hairs inside the nose trap dust and germs but there are no
hairs inside the mouth.
$8. D.$ It prevents dust from entering the body
$9.$ No
Yes
No
$10. B.$ Nitrogen

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Question 24 Marks

Ravi ills a steel vessel with water and starts heating it on an oven.
He notices small bubbles at the bottom of the vessel after some time.

$5.$ Where do the bubbles come from?

Answer

$5.$ Mentions from the air dissolved in water as the response.
For example
● From the air dissolved in water.

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MCQ 34 Marks

Roja blows air through a straw into a glass of water.
She sees bubbles coming out from the straw in the water.

$4.$ What does this show?

A
Air has mass.
✓
Air takes up space.
C
Air can exert pressure.
D
Air contains water vapour.

Answer

Correct option: B.

Air takes up space.

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Question 44 Marks

Sumit wants to find out if burning takes place only in the presence of air.
He places a burning candle inside each of the four inverted glasses.

$1.$ Inside which glass will the candle stop burning last?
$A.$ Glass $1$
$B.$ Glass $2$
$C.$ Glass $3$
$D.$ Glass $4$
$2.$ What should Sumit keep the same for the activity?
Circle $‘Yes’$ or $‘No’$ for the correct response.

Should this be kept the same?	$Yes$ or $No$
Size of the candles	$Yes/No$
Thickness of the glass walls	$Yes/No$
Thickness of the glass walls	$Yes/No$

$3.$ Which of these shows that air contains water vapour?
$A.$ Steam is produced when water is heated.
$B.$ Road surfaces shine on hot summer days.
$C.$ Dew appears on plant leaves on winter nights.
$D.$ Tiny particles shine in a narrow beam of sunlight.

Answer

$1. A.$ Glass $3$
$2.$ No
No
Yes
$3. C.$ Dew appears on plant leaves on winter nights.

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Science case /data -based (4 Marks)

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