case /data -based (4 Marks)

Question 14 Marks

$1 \ kg$ wheat grains are mixed with $1 \ kg$ mustard seeds.

$10.$ Write a suitable method to separate the mustard seeds from wheat grains.

Answer

$10.$ Mentions sieving as a suitable method

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Question 24 Marks

A beaker contains a mixture of salt, sand and water.
The mixture is iltered using ilter paper.

$8.$ What is substance $X$?
$9.$ Write a single separation method by which water can be separated from a mixture of salt, sand and water.

Answer

$8.$ Mentions that substance $X$ is sand
$9.$ Mentions the process of evaporation

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MCQ 34 Marks

Tea leaves are separated with a strainer while pouring tea.

$7.$ What property of tea leaves is used to separate them from the tea?

✓
Size
B
Mass
C
Shape
D
Thickness

Answer

Correct option: A.

Size

size

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Question 44 Marks

Anu adds sugar and salt to two separate glasses of water.
She stirs the mixture in each glass every time she adds salt or sugar to it.

She notes her indings in a table.

$3.$ What can Anu conclude from her activity?
$A.$ Sugar and salt dissolve equally in water.
$C.$ Stirring helps in dissolving all substances in a liquid.
$B.$ Sugar is more soluble than salt in water.
$D.$ Sugar forms a saturated solution in water but salt does not.
$4.$ Anu used two spoons of the same size to add sugar and salt to water.
What else did Anu need to keep the same for her activity?
$5.$ Anu repeats the activity using hot water.
Will the results in the table remain the same? Explain your answer
$6.$ Which of these processes could be used to separate the salt dissolved in the glass of water?
$A.$ Filtration
$B.$ Evaporation
$C.$ Condensation
$D.$ Sedimentation

Answer

$3. B.$ Sugar is more soluble than salt in water.
$4.$ Mentions that the amount of water in the glasses must be same
For example
● The two glasses must have the same amount of water.
$5.$ Mentions that all three spoons of salt would dissolve in water because
larger quantities of salt can be dissolved in water on heating it
$6. B.$ Evaporation

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Question 54 Marks

Saroj collected muddy water from a pond.
He separated the water from the mud in three steps as shown in the pictures below.

$1.$ Which separation method did Saroj use at each step?
Select the correct row.

	Step $1$	Step $2$	Step $3$
$A.$	Evaporation	Sedimentation	Decantation
$B.$	Sedimentation	Decantation	Filtration
$C.$	Decantation	Sedimentation	Condensation
$D.$	Sedimentation	Filtration	Decantation

$2.$ Did Which of these properties did Saroj use to separate mud from water?
$A.$ Mud loats on water.
$B.$ Mud dissolves in water.
$C.$ Mud turns water cloudy.
$D.$ Mud is heavier than water.

Answer

$1. B.$ Sedimentation Decantation Filtration
$2. D.$ Mud is heavier than water.

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Science case /data -based (4 Marks)

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