case /data -based (4 Marks)

Question 14 Marks

Shilpa wanted to ind out which dye creates a permanent stain on clothes.

She poured one drop each of four different dyes on separate pieces of cloth.
Shilpa then washes each piece of cloth with a detergent.
The table below shows what happened after the clothes were washed.

Dye	Was the stain removed after washing?
Dye $1$	yes
Dye $2$	no
Dye $3$	yes
Dye $4$	yes

$9.$ Which dye produced a permanent stain on the cloth?
$A.$ Dye$ 1$
$B.$ Dye $2$
$C.$ Dye $3$
$D.$ Dye $4$
$10.$ What must Shilpa keep the same for all the four clothes in her activity?

Answer

$9. B.$ Dye $2$
$10.$ Mentions that Shilpa must keep the material of the clothes same for the
activity.
● Shilpa must keep the material of the pieces of cloth same for the
activity.

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Question 24 Marks

Leena had a glass container with butter cubes in it.
She could not open the metal cover as it was too tight.
Leena placed the container in a tumbler of hot water.

Leena took the container out of the hot water after $15$ minutes.
She was then able to remove the metal cover.
$5.$ How did hot water help in removing the metal cover?
$6.$ What is Leena likely to ind after taking the container out of hot water?
$A.$ Butter cubes have melted.
$B.$ Butter cubes have got larger.
$C.$ Butter cubes have got harder.
$D.$ Butter cubes have changed to a new substance
$7.$ Which of the following changes can be reversed?
Circle $‘Yes’$ or $‘No’$ to mark your response.

Can this change be reversed?	$Yes$ or $No$
Melting of wax	Yes/No
Shredding of paper	Yes/No
Bending of rubber pipe	Yes/No

$8.$ Which condition must be true for a permanent change?
$A.$ Change in shape
$B.$ Change in volume
$C.$ Loss or gain of heat
$D.$ New substance is formed

Answer

$5.$ Mentions that the metal cover expanded as it absorbed heat and this is
why it could be easily removed
For example
● The metal cover expands as it absorbs heat.
$6. A.$ Butter cubes have melted.
$7.$ Yes
No
Yes
$8. D.$ New substance is formed

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Question 34 Marks

Mary lit an incense stick.
She sensed a pleasant smell for as long as the stick was burning.
The incense stick burned up completely, leaving some ash behind.

$3.$ What can be concluded from Mary’s activity?
Circle $‘Yes’$ or $‘No’$ to mark your response.

Can this be concluded from the activity?	$Yes$ or $No$
Incense sticks contain chemicals that produce smell when burnt	Yes/No
Burning of incense sticks produces light.	Yes/No
A new substance is formed by the burning of incense sticks.	Yes/No

$4.$ Which of these changes can be reversed?
$A.$ Boiling of egg
$B.$ Burning of wood
$D.$ Making curd from milk
$C.$ Melting of ice cream

Answer

$3.$ Yes
Yes
Yes
$4. C.$ Melting of ice cream

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Question 44 Marks

A chick hatches out from an egg by breaking the eggshell.

$2.$ Is the breaking of the eggshell a permanent change or a temporary change?
Explain your answer

Answer

$2.$ Mentions that breaking of an eggshell is a permanent change as the
process cannot be reversed
For example:
● The breaking of the eggshell is a permanent change because it cannot
be reverse.

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Question 54 Marks

The pictures show two types of change in objects.

Which statement about the two changes is true?
Circle $'Yes'$ or $'No'$ for the correct response.

	$Yes$ or $No$
Change $1$ can be reversed.	$Yes/No$
A new substance is formed in change $2.$	$Yes/No$
Change $1$ requires cooling but change $2$ requires heating.	$Yes/No$

Answer

$1.$Yes
Yes
No

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Science case /data -based (4 Marks)

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