Three Pin Plug

Q. A 3 pin plug consists of :

1. Earth wire
2. Live wire
3. Neutral wire
4. None of the above

Q.

Give the meaning of the term earthing

Q. In the case of bulbs connected in parallel, if one of the bulbs is fused, the others still continue to glow.

1. True
2. False

Q.

Why the third pin of a 3 pin plug is longer and thicker?

1. All pins are of same size.

2. It is for protection purpose.

3. It is for designing purpose.

4. It is for reducing the current consumed

Q. The thick and long pin in a three pin plug is connected to __.

1. live wire
2. neutral wire
3. earth wire
4. either live or earth wire

Q.

Which cells are known as accumulators?

Q. Pick the safety device used in domestic electric circuits.

1. CFL
2. MCB
3. Switch
4. Battery

Q. Nayana has set up an electric circuit using some connecting copper wires, a battery, a switch and a bulb that she has taken from a torch light. But after connecting the equipments, the bulb is not glowing. What can be the reason(s) for this?

1. Torch light bulbs cannot be used for this experiment.
2. The battery is dead.
3. The bulb's filament is broken.
4. The circuit which should be closed is open instead.

Q. For the circuit shown in the figure below, answer the following questions:

1. Would any of the bulb glow when the switch is in the ‘OFF’ position?
2. What will be the order in which the bulb A, B, and C will glow when the switch is moved to the ‘ON’ position?

Q. Pick the safety device used in domestic electric circuits.

Q. is electric flux conserved?

Q. Which of the following statements about an electric circuit is/are true?

1. The circuit can be closed only when the switch is in OFF position.
2. The wires should not have any breaks or gaps for circuit to be closed.
3. The circuit can be closed only when the switch is in ON position.
4. It should have only one electric cell.

Q. Consider the below circuit diagram.

Which of the following bulbs would glow, when the switch is in its OFF position?

1. Bulbs B and C
2. None of the bulbs would glow
3. Bulb A
4. All the bulbs would glow

Q. 'X' is a safety device used in electrical circuits which prevents damage to electrical equipments. Identify 'X':

1. Electromagnet
2. Tubelight
3. Fuse
4. Electric cell

Q. An incandescent lamp was connected to an electric circuit but it did not glow. Which of the following could not be a valid reason for the bulb not glowing?

1. The filament of the bulb was burnt out.
2. The positive and negative terminals of the battery were interchanged.
3. The battery was out of power.
4. The switch in the circuit was not closed.

Q. Which of the following statements about an electric circuit is/are true?

1. It should have only one electric cell.
2. The circuit can be closed only when the switch is in ON position.
3. The circuit can be closed only when the switch is in OFF position.
4. The wires should not have any breaks or gaps for circuit to be closed.

Q. Choose the correct statement(s) for an electric circuit:
Statement (i) : In a closed loop, the bulb glows.
Statement (ii) : In an open loop, the bulb does not glow.

1. Both statement (i) and statement (ii) are correct.
2. Only statement (i) is correct
3. Both statment (i) and statement (ii) are incorrect
4. Only statement (ii) is correct

Q. Consider the below circuit diagram.

Which of the following bulbs would glow, when the switch is in its OFF position?

1. None of the bulbs would glow
2. Bulb A
3. All the bulbs would glow
4. Bulbs B and C