Class-7 Electric and its Effects

Identify the symbol here

• Electric Cell

• Switch

• Battery

• Bulb

How many terminals a cell has

• Two, both positive

• Two, both negative

• Two, one positive and another negative

• None of the above

An electromagnet does not attract a piece of iron

• True

• False

When the electric current passes through fuse exceeds a certain limit, the fuse wire melts and breaks

• Ture

• False

An electric bulb is an example of the heating effect of an electric current

• True

• False

A battery has one or more cells

• True

• False

Which of the following is most electricity efficient

• Incandescent Bulbs

• Compact Fluorescent Lamp (CFL)

• Light Emitting Diode (LED) Lamp

• Sodium Lamp

The coil of wire contained in an electric heater is known as:

• Component

• Element

• Circuit

• Spring

The filament of an electric bulb is made of:

• Iron

• Copper

• Tungsten

• Aluminum

The amount of heat produced in a wire depends on its:

• Material

• Length

• Thickness

• All of the above