case /data -based (4 Marks)

Question 14 Marks

The table shows the caloriic value and pollutants released by four types of fuels.

Fuel	Caloriic value (kilojoule / kg)	Pollution factor
Type $1$	$25000 - 33000$	$CO_2,$ sulphur oxides and Nitrogen oxides
Type $2$	$55000$	$CO_2,$ Water vapour
Type $3$	$45000$	Carbon monoxide, $CO_2,$ Nitrogen oxides
Type $4$	$35000 - 40000$	$CO_2$ and Methane

$8.$ Which fuel can boil the water in a vessel the fastest$?$
$A.$ Type $1$
$B.$ Type $2$
$C.$ Type $3$
$D.$ Type $4$
$9.$ Which fuel can cause acid rain on combustion$?$
$A.$ Type $1$ only
$B.$ Type $4$ only
$C.$ Both Type $1$ and Type $3$
$D.$ Both Type $2$ and Type $4$
$10.$ Which fuel type is likely to be biogas$?$
$A.$ Type $1$
$B.$ Type $2$
$C.$ Type $3$
$D.$ Type $4$

Answer

$8. B.$ Type $2$
$9. C.$ Both Type $1$ and Type $3$
$10. D.$ Type $4$

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Question 24 Marks

Fire extinguisher $K$ is suitable for kitchen fires.

$5.$ Which ire extinguisher can perform most of the work of $K?$
$A. P$
$B. Q$
$C. R$
$D. S$
$6.$ How does dumping sand on ire extinguish the flame$?$
$7.$ Which of these materials is combustible$?$
$A.$ Steel
$B$. Wood
$D.$ Marble
$C.$ Glass

Answer

$5. B. Q$
$6.$ Mentions that sand cuts off the oxygen supply to the lame.
$7. B.$ Wood

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Question 34 Marks

The picture shows four types of ire extinguishers.
Each extinguisher is suited for speciic sources of fire.

$4. $ A tailor has money for any two of the ire extinguishers.
Which pair of ire extinguishers should he buy for his tailoring shop$?$
$A. P$ and $Q$
$B. Q$ and $S$
$C. P$ and $R$
$D. S$ and $R$

Answer

$4. C. P$ and $R$

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Question 44 Marks

Sparkling rods light up when inserted in a flame.
The hotter the lame, the quicker the rod lights up.
The picture shows four different zones of a flame.

$1.$ In which zone should a sparkling rod be inserted to light it the fastest$?$
$A.$ Zone $1$
$B.$ Zone $2$
$C.$ Zone $3$
$D.$ Zone $4$
$2.$ Why does the lame of a candle go off when all the wax melts$?$
$3.$ Which of these is true about spontaneous combustion$?$
Circle ‘Yes’ or ‘No’ for the correct response.

Is this true about spontaneous combustion?	Yes or No
No fuel is required.	Yes/No
No oxygen is required.	Yes/No
No external heat source is required.	Yes/No

Answer

$1. A.$ Zone $1$
$2.$ Mentions that wax is the fuel for the combustion.
$3.$ No
No
Yes

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Science case /data -based (4 Marks)

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