Quiz no 2, Class 7(Science)

Who discovered the magnetic effect of current?

• Joule

• Maxwell

• Oersted

• Newton

Electric bulb converts electrical energy into

• sound energy

• mechanical energy

• light energy

• Magnetic energy

The device used to close or open an electric circuit is

• switch

• Ammeter

• Voltmeter

• Resistance

The safety device used for electrical appliances is

• resistance

• Fuse

• Connecting wire

• None of these

Which of the following appliances is not based on the principle of heating effect of current?

• electric bell

• electric kettle

• electric bulb

• electric press

A coil refers to

• an electric wire

• a fuse

• a wire twisted in the form of a circle

• None of these

In an electric bell, which of these gets attracted to the electromagnet?

• the hammer

• the soft iron strip

• the screw

• None of these

An electric circuit is a closed path in which current flows.

• True

• False

The magnetic strength in a conductor decreases with the increase in current.

• True

• False

Identify the circuit given here.

• Close circuit

• Open circuit