case /data -based (4 Marks)

Question 14 Marks

The $5\ R$ principle is about environment - friendly practices.
The key components of the principle are as follows.
● Reuse
● Refuse
● Reduce
● Recycle
● Recover
$10.$ The government advises people to stop using plastic bags for grocery shopping.
Which component of the $5\ R$ principle is this advice related to$?$

Answer

$10.$ Mentions refuse as the response

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Question 24 Marks

Erik dumped four types of domestic waste in separate land pits.
He covered the pits and left them undisturbed for a year.
The table below shows what he observed after a year.

Waste $1$	Waste $2$	Waste $3$	Waste $4$
Fully decomposed	Not decomposed at all	Fully decomposed	Not decomposed at all

$9.$ Which type of waste(s) is most likely to cause soil pollution$?$

Answer

$9.$ Mentions Waste $2$ and Waste $4$ as the response

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Question 34 Marks

The pictures show the arrangement of chemical units in two types of plastics.

$7.$ What terms are used to describe the arrangement in Type $1$ and Type $2$ plastics$?$
$8.$ Which of these features is/are essential to classify a plastic as thermoplastic$?$
Circle ‘Yes’ or ‘No’ to mark your response.

Is this feature essential for classifying a plastic as thermoplastic?	Yes or No
It bends easily on heating.	Yes/No
It does not react with air and water	Yes/No
It is a good conductor of heat.	Yes/No

Answer

$7.$ Mentions that Type $1$ is cross-linked arrangement and Type $2$ is linear arrangement
$8.$ Yes
Yes
No

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Question 44 Marks

Sujoy had four different fabrics.
He lit each fabric on ire and observed what happened.

Fabric $1$	Fabric $2$	Fabric $3$	Fabric $4$
Burned completely,some ash left behind	Melted into a sticky substance	Burned completely, some ash left behind	Melted into a sticky substance

$5.$ What is Sujoy trying to ind out$?$
$A.$ Which fabric is a polymer$?$
$B.$ Which fabric is the strongest$?$
$C.$ Which fabric is natural and which fabric is synthetic$?$
$D.$ Which fabric is most comfortable to wear in summers$?$
$6.$ Which of the following activities is dangerous while wearing a shirt made of fabric $2?$
$A.$ Riding a bicycle
$B.$ Cooking on a gas stove
$C.$ Watering plants in a garden
$D.$ Painting with water colours

Answer

$5. C.$ Which fabric is natural and which fabric is synthetic$?$
$6. B.$ Cooking on a gas oven

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Question 54 Marks

Ameeta ties four strings made of different materials to a wall.
She then pulls each string until it breaks.
The arrow shows the direction of the force.

The table shows the amount of force needed to break each string.

String	Amount of force needed to break the string (Newton)
String $1$	$10$
String $2$	$2$
String $3$	$14$
String $4$	$4$

$1.$ Draw the bars in the graph below to show the observations of Ameeta’s activity.
Fill in the dotted columns to show the correct values along the $Y- $axis.

$2.$ Which string is made of the strongest ibre$?$
$A.$ String $1$
$B.$ String $2$
$C.$ String $3$
$D.$ String $4$
$3.$ What must Ameeta keep the same in her activity$?$
$A.$ Colour of the strings
$B.$ Length of the strings
$C.$ Thickness of the strings
$D.$ Height of the strings from ground
$4.$ Which of the following statements is/are true about polymers$?$
Circle ‘Yes’ or ‘No’ to mark your response.

Is the statement correct?	Yes or No
All synthetic ibres are polymers.	Yes/No
Some natural ibres are polymers.	Yes/No
Polymers are made of multiple small chemical units.	Yes/No

Answer

$1.$ Draws the bars in the graph correctly

$2. C.$ String $3$
$3. C.$ Thickness of the strings
$4.$ Yes
Yes
Yes

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Science case /data -based (4 Marks)

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