An Electric Circuit

Q.

Is the TV using direct current or alternating current?

Q. In an electric circuit, the conventional flow of electric current is taken opposite to the flow of electrons.

1. True
2. False

Q.

A simple circuit consists of___.

1. plug pin and socket

2. power source

3. cell

4. conductors and switch

Q.

Which one of the following options makes a bulb to glow more brightly?

1. Bulb connected to 3 dry cells of 1.5 V each connected in series.

2. Bulb connected to 2 cells of 2 V each.

3. Bulb connected to 3 dry cells of 3 V each connected in series.

4. Bulb connected to one dry cell of 6 V.

Q. The glowing part of a bulb is the .

1. filament
2. glass chamber
3. electron tube

Q.

State the role of MCB in an electrical circuit. In what way it is better than a fuse?

Q. The conventional direction of current flow in an electric circuit is from the to the terminal of the battery through the external path.

1. positive
2. negative
3. neutral
4. external

Q. In the given circuit, the switch is turned 'ON' at a point of time. Which of the two fuses will blow up first? Assume both the fuses are identical.

1. Fuse 2
2. Both the fuses blow simultaneously.
3. Fuse 1
4. Neither of them will blow.

Q. You are provided with a bulb, a cell, two wires, a switch. Draw a diagram to show a complete circuit.

Q.

Emma connected a bulb to an electric circuit, after studying a circuit diagram, but it did not glow. Which of the following cannot be a valid reason for the bulb not glowing?

1. All of these

2. Neutral terminal of the cell

3. Positive terminal of the cell

4. Negative terminal of the cell

Q.

List two ways by which you can reduce consumption of electricity.

Q. In an electric circuit, the current flows from to terminal of the battery.

1. positive
2. negative
3. inner
4. outer

Q.

A safety device in an electric circuit

Q. Why can a current pass through a capacitor and not through an open switch ?

Q. An electric cell need not be present in an electric circuit to make a bulb to glow.

1. False
2. True

Q. We use symbols to draw a circuit __________

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

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

Q. If there is no flow of current in the circuit, which can be the suitable reason from the following?

1. Broken wire in the circuit
2. Molten fuse wire
3. Closed switch
4. Properly connected wires

Q.

What is a circuit diagram?

1. A circuit diagram is a simplified representation of the conductors.

2. A circuit diagram is a simplified representation of all the components of an electrical circuit.

3. A circuit diagram is a simplified representation of batteries.

4. A circuit diagram is a simplified representation of switches and batteries.

Q. Label the parts of the electric bulb given below.

1. Base
2. Glass chamber
3. Filament
4. Conducting wire

Q.

In a bulb, electrical energy is converted into:

1. Heat energy

2. Mechanical energy

3. Light energy

4. Both Heat and Light energy