Electric Bulb and Electric Fuse

Q. What does a 5 A rating on a fuse mean?

1. Fuse melts down if the current is less than 5 A.
2. Fuse allows a current only equal to 5 A through it.
3. Fuse produces energy if current is less than 5 A.
4. Fuse melts if the current is more than 5 A.

Q.

Why is fuse wire used in electric circuits?

1. To increase current flowing in the circuit.

2. For the protection of electrical appliances and circuit.

3. To prevent insulation.

4. To increase the voltage.

Q.

In a bulb, electrical energy is converted into:

1. Light energy

2. Mechanical energy

3. Heat energy

4. Both Heat and Light energy

Q.

Which of the following is used as a safety device?

1. Battery

2. Filament

3. Fuse

4. Switch

Q.

Filament of a bulb is made up of:

1. Tungsten

2. Copper

3. Iron

4. Aluminum

Q.

An electric bulb works on which of the following principles:

1. Both A and B

2. Magnetic effect of electric current

3. Heating effect of electric current

4. Chemical effect of electric current

Q.

Which is the component that breaks the electric circuit in case of excess current?

1. Fuse wire

2. Voltmeter

3. Earth wire

4. Ammeter

Q.

For a fuse rated at 5A, the fuse melts if the current in the circuit exceeds 5A.

1. True

2. False

Q. In which of the following cases, the fuse operates to break the circuit?

1. Underloading
2. Overloading
3. Short circuit
4. (b) and (c) above.

Q.

When the live wire and the fuse wire come in contact with each other in a circuit, it causes a/an _________.

1. circuit breaker

2. short circuit

3. overloading

4. earthing