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15 questions
Why is it unsafe to switch on a bulb with wet hands?
The switch blows off.
It can give a shock.
The bulb gets fused.
The wires are disconnected.
Why do electricians wear gloves made of rubber?
It is soft.
It is waterproof.
It is an insulator.
It is inexpensive.
If we touch a a live wire carrying current, we get a shock. This is because our body is a/an
conductor of electricity
insulator of electricity
source of electricity
None of these
Which among the following metal is used for making electric wires?
Graphite
Iron
Copper
Zinc
Why is tungsten used as a filament in electric bulbs?
It is non luminous
It is a soft metal
It has a high melting point
It has a low melting point
Which of the following does NOT conduct electricity?
Aluminium
Salt solution
Silver
Ceramic articles
Why is a switch used in a circuit?
To complete or break a circuit
To save energy
To prevent electric shocks
To make the bulb glow easily
The bulb in a circuit glows when electric current
flows through the glass covering
flows through its filament
stops flowing to the bulb
flows into the air through the bulb
What are the two places on the battery to which the wires can be attached called?
Switches
Filaments
Insulators
Terminals
A cell, a conducting wire and a bulb are used for constructing a simple electric circuit. What are they called?
Consumers
Connectors
Components
Sources
Which of these will generate electric current when kept in sunlight but not in the dark?
Solar cell
Car battery
Dry cell
Button cell
What does a battery contain?
A minimum of three terminals
A minimum of two terminals
A cell and a switch
A bulb and a switch
Tube lights are preferred to bulbs mainly because
Bulbs gives more light
Bulbs get fused easily/frequently
Bulbs are cheaper
Bulbs produce shadows
Which of the following statement is incorrect?
A dry cell produces a small amount of electrical energy
All dry cells are rechargeable
A dry cell is used in TV remotes
There are two terminals in a battery
What is the source of electricity in the satellites?
Dry cells
Solar cells
Dynamos
Accumulators
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