Electric current, and its effects

Which of the following cannot be an example for the use of electromagnets

• Electric Bell

• Doorbells

• Oven

• Phone

The device used to make or break an electric circuit is

• Resistor

• Battery

• Switch

• Ammeter

Current flows through the circuit when the circuit is in the _________________condition.

• Broken

• Open

• Closed

• Incomplete

The amount of heat produced in a wire depends on

• Material

• Length

• Thickness

• All of these

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

• Fuses

• Electric fuses

• A&B

• Electromagnet

Who discovered Magnetic effect of current?

• Nikola Tesla

• Charles Lyell

• Hans Christian Oersted

• Charles Darwin

Which mark is present on electric appliances to ensure their safety?

• MCB

• FSSAI

• ECB

• ISI

Which of the following is used as a safety device?

• Resistor

• Bulb

• Fuse

• Switch

A battery is a combination of

(a) only single cell

(b) only two cells

(c) two or more cells

(d) None of the above

• a

• b

• c

• d

In making a battery

(a) the positive terminal of one cell is connected to the negative terminal of the next cell

(b) the positive terminal of one cell is connected to the positive terminal of the next cell

(c) the negative terminal of one cell is connected to the negative terminal of the next cell

(d) none of the above

• a

• b

• c

• d