Electric current and its effects

At the time of short circuit, the current in the circuit:

• reduces substantially

• does not change

• increase heavily

• varies continously

The filament of an electric bulb is made of a thin wire of:

• copper

• aluminium

• nichrome

• tungsten

An electric fuse works on the:

• chemical effect of current

• magnetic effect of current

• lightning effect of current

• heating effect of current

In a filament - type bulb, a lot of electric energy is wasted in the form of:

• magnetism

• sound

• light

• heat

Which of the following characteristics are not suitable for a fuse wire?

• thin and short

• thick and short

• low melting point

• higher resistance than the rest of the wiring

In making a battery

• positive terminal of one cell is connected to the negative terminal of the next cell

• positive terminal of one cell is connected to the positive terminal of the next cell

• negative terminal of one cell is connected to the negative terminal of the next cell

• none of the above

Where can the switch be placed in the circuit?

• Left side of the battery

• Right side of the battery

• Can be placed anywhere in the circuit

• Near the positive terminal of the bulb

Which one of the following is based on the heating effect of current?

• Geyser

• Hair dryer

• Immersion rod

• All of these

The amount of heat produced in a wire depends on

• material

• length

• thickness

• all of these

Choose the statement which is not correct in the case of an electric fuse.

• Fuses are inserted in electric circuits of all buildings.

• There is a maximum limit on the current which can safely flow through the electric circuits.

• There is a minimum limit on the current which can safely flow in the electric circuits.

• If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.