[5 Marks Each] QUE-ANS

Question 15 Marks

Mention different safety measures and precautions while using electricity and electrical appliances.

Answer

Electricity is very useful to us. It has made our life comfortable, easy and luxurious. On the other hand, it is dangerous also. It may cause great mishappenings, injuries and sometimes even death. So we must adopt some safety measures and take precautions discussed below:
$1.$ Never touch electrical switches or gadgets when your body is wet.
$2.$ If you need to operate or repair any electrical appliances, wear rubber hand gloves and stand on a dry wooden or plastic base. $3.$ Never play with electric sockets or wires.
$4.$ In case of short circuit or a spark in a switch, put the main switch off immediately with the help of a plastic or wooden stick.
$5.$ In case of fire in electric wires, never use water to extinguish it. First switch off the mains, then use dry sand to extinguish the fire.

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Question 25 Marks

A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reasons for this? Mention any three.

Answer

The possible reasons for not functioning of torch are:

The torch bulb may be fused.
The cells may be discharged.
The connecting wires may be broken up.
The cells may not be placed in the correct order.
The switch is faulty.

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Question 35 Marks

Match the following items given in Column $A$ with that in Column $B$:

S.No.	Column $A$	S.No.	Column $B$
$(a)$	Cell	$(i)$	Allows electricity to pass through it.
$(b)$	Battery	$(ii)$	Either breaks or completes a circuit.
$(c)$	Conductor	$(iii)$	Converts electricity into light.
$(d)$	Insulator	$(iv)$	Glows when electricity passes in it.
$(e)$	Switch	$(v)$	A device which produces electricity.
$(f)$	Bulb	$(vi)$	Is a path of electricity.
$(g)$	Filament	$(vii)$	Does not allow electricity to pass.
$(h)$	Circuit	$(viii)$	A combination of cells.

Answer

S.No.	Column $A$	S.No.	Column $B$
$(a)$	Cell	$(v)$	A device which produces electricity.
$(b)$	Battery	$(viii)$	A combination of cells.
$(c)$	Conductor	$(i)$	Allows electricity to pass through it.
$(d)$	Insulator	$(vii)$	Does not allow electricity to pass.
$(e)$	Switch	$(ii)$	In Either breaks or completes a circuit.
$(f)$	Bulb	$(iii)$	Converts electricity into light.
$(g)$	Filament	$(iv)$	Glows when electricity passes in it.
$(h)$	Circuit	$(vi)$	Is a path of electricity.

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Question 45 Marks

Think of six activities which use electric current. Also name the devices used to perform the activity.
Example:

Activity you perform	Device
Get light	Torch

Answer

The name of the devices and their activity are as given:

Activity you perform	Device
Get light	Torch
Get the moving air	Fan
Get the mechanical work	motor
Get the hot water	Geyser
Get the cold water	Refrigerator
Get the live match or movies	Television

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Science [5 Marks Each] QUE-ANS

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