case /data -based (4 Marks)

Question 14 Marks

Namita has three boxes with the same thickness.
She places a burning candle inside each box.
The images show how Namita was able to view the candle through each box.

$7.$ Which box is made of an opaque material?
$8.$ Namita replaces box $1$ with a thicker box made of the same material and repeats the activity.
Will there be any change in the results of the activity? Explain your answer.
$9.$ Which object is commonly made of plastic?
$A.$ House gate
$B.$ Sleeping cot
$C.$ Cooking vessel
$D.$ Water bottle
$10.$ Neeraj spilled some water on the loor. He cleaned the loor using a mop. Which material is best suited for making the mop?
$A.$ Iron scrubber
$B.$ Cotton cloth
$C.$ Plastic sheet
$D.$ Copper sheet

Answer

$7.$ Mentions that Box $3$ is made of an opaque material.
● Box $3$
$8.$ Mentions that there will be no change in the results of the activity
because the material of both the boxes is the same.
● There will be no change in the results because the thicker box is also
made of a transparent material like Box $1$.
$9. D.$ Water bottle
$10. B.$ Cotton cloth

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Question 24 Marks

The picture shows two hollow pipes.
One pipe is made of copper and the other is made of plastic.

$5.$ Which of the following will help to identify the pipe made of copper?
$A.$ Place the pipes in water and check if they absorb water.
$B.$ Rub the pipes with sandpaper and check if they appear shiny.
$D.$ Bring the pipes near a magnet and check if they are attracted by the magnet.
$C.$ Hold the pipes under a glowing bulb and check if they produce shadows
$6.$ Which of these is a translucent object?
$A.$ An iron plate
$B.$ A glass sheet
$C.$ A concrete slab
$D.$ A sheet of tissue paper

Answer

$5. B.$ Rub the pipes with sandpaper and check if they appear shiny.
$6. D.$ A sheet of tissue paper

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Question 34 Marks

Aqeel poured liquid $1$ and liquid $2$, each to a jar of water.
He stirred the mixture in each jar with a spoon.
He allowed the mixtures to rest for $10$ mins.

$3.$ Are liquid $1$ and liquid $2$ soluble in water?
Write Yes or No in the space given in the table below.

Type of liquid added to water	Is it soluble in water?
Liquid $1$
Liquid $2$

$4.$ Which of the following must Aqeel keep the same in his activity?
Circle $‘Yes’$ or $‘No’$ for the correct response.

Should this be kept the same in the activity?	$Yes$ or $No$?
Amount of the two liquids added to water	$Yes/No$
Amount of water in both the jars	$Yes/No$
Amount of time the two mixtures were stirred	$Yes/No$

Answer

$3.$ Mentions that Liquid $1$ mixes well in water and Liquid $2$ does not mix
well in water.
For example
● Liquid $1$: Yes
● Liquid $2$: No
$4.$ Yes
Yes
Yes

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MCQ 44 Marks

Rajiv dropped a silver and a gold coin each in a jar of water.
The picture below shows what happened.