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Electric and it's effects

Total questions: 28

Worksheet time: 15mins

Name
Class
Date
1.

What is used in electric irons, hot plates etc.

a)

Filament

b)

Tungsten

c)

copper

d)

Element

2.

Which is the alloy used in the element

(a)  

3.

What is the filament made up of?

(a)  

4.

Which of these can be used in electrical wires

a)

Rubber

b)

Copper

c)

Iron

d)

Lead

e)

Solid NaCl

5.

What is this symbol for?

a)

Battery

b)

bulb

c)

electric cell

d)

wire

6.

A fuse wire is a wire of-

a)

High resistivity and low melting point

b)

High resistivity and high melting point

c)

Low resistivity and low melting point

d)

Low resistivity and high melting point

7.

When current is switched 'on' of a bulb it converts _______ energy into _______ energy.

a)

Electrical, heat

b)

Electrical, light

c)

Electrical, mechanical

d)

Electrical, sound

8.

When current is switched on in an electric bell, it converts _______ energy into _______ energy.

a)

Electrical, light

b)

Electrical, sound

c)

Electrical, heat

d)

Mechanical, sound

9.

The magnitude of magnetism produced by an electric current in a wire depends upon- (a) Increases with an increase in the strength of electric current (b) Decreases, as the distance from the wire increases

a)

Both a, b

b)

Only a

c)

Only b

d)

None

10.

A common household device, that do not use an electromagnet in its working, is-

a)

The electric bell

b)

Geyser

c)

Telephone

d)

Loud speaker

11.

The filament of A bulb, is a wire of

a)

High resistivity, low melting point

b)

Low resistivity, low melting point

c)

High resistivity, high melting point

d)

Low resistivity, high melting point

12.

When electric current flows through the metal filament of the bulb it gets heated to very high temperature and becomes______ hot and start emitting _______.

a)

White, light

b)

Red, light

c)

White, heat

d)

Red, heat

13.

When electricity flows through heating coil it becomes ________ hot and gives out _______ energy, which is to put in practical use.

a)

Red, heat

b)

White, heat

c)

Red, light

d)

White, light

14.

If a positive terminal of one cell is connected to the negative terminal of the next cell it is known as

a)

Electric current

b)

Fuse

c)

Battery

d)

Element

15.

When the switch is on the circuit from the positive to negative terminal is complete

a)

True

b)

False

16.

Which of these following cannot be harmed by electric current

a)

Plastic

b)

Rubber

c)

A & B

d)

All of the above

17.

Wires made from some special materials melt quickly and break when a large electric current passes through it.these wires are used to make

a)

Fuses

b)

Electric fuses

c)

A&B

d)

Electromagnet

18.

Who was the first person to notice the deflection of compass needle everytime the current passes through the wire.

a)

Hans Christian Andersen

b)

Hans Christian oersted

c)

Hans Christian mandorson

d)

None of the above

19.

When the current goes off the coil generally loses its magnetism. Such coils are called

(a)  

20.

When an electric current flows through the wire it gets heated it is known as the heater

a)

True

b)

False

21.

Electromagnets could be used in particular devices

a)

True

b)

False

22.

The coil of a wire is known as element

a)

True

b)

False

23.

Which of the following cannot be harmed by current

a)

None of the below

b)

Plastic

c)

Rubber

d)

All of the above

24.



(a)  

25.

State true or false:

Can 1.5 volt battery be used to make an electromagnet?

a)

True

b)

False

26.

The most suitable material for making the core of an electromagnet is:

a)

Iron

b)

Aluminum

c)

Brass

d)

Steel

27.

A fuse wire is a wire of-

a)

High resistivity and low melting point

b)

High resistivity and high melting point

c)

Low resistivity and low melting point

d)

Low resistivity and high melting point

28.

Connection of more than one device/ appliance to a single socket is called-

a)

Overloading

b)

Short circuit

c)

Both