Chapter 16: Electric current and circuit

Full form of MCB is _____

• miniature circuit breaker

• most circuit breaker

• maximum circuit breaker

• minimum circuit breaker

The strength of an electromagnet can be increased by _____

• increasing the number of turns of conducting wires

• decreasing the number of turns

• decreasing the strength of current

• all of the options

What is the shape of the magnet used in an electric bell?

• cylindrical

• bar

• horseshoe

• square

Which component of a circuit converts chemical energy into electrical energy?

• electric cell

• electric bell

• connecting wire

• electric switch

Which of the following appliances does not use the heating effect of current?

• electric heater

• electric bell

• electric geyser

• electric bulb

The (a)   works on the principle of heating effect of current.

(a)   is used to make filament of a bulb.

Heating effect of the current was first discovered by (a)  

(a)   is a coil of wire closely wound in the form of spiral.

Electric bell is based on the principle of (a)