Electric Circuit

Q.

What are the characteristics of fuse wire?

Q.

An electric bulb only glows when the circuit is closed.

1. Current flows through the circuit

2. Electric circuit is incomplete

Q.

In a closed circuit, electrons flow from negative to positive terminal of a cell.

1. True

2. False

Q.

Instead of metal wires, a jute string can be used for making electrical circuits.

1. Running a car

2. All of these

Q.

Cotton is a good conductor of electricity.

1. True
2. False

Q.

What are the main components of an electric circuit? Why are metal wires used in electric circuits? [3 MARKS]

Q.

Question 15

Paheli connected two bulbs to a cell as shown in the figure.

She found that filament of the bulb B is broken. Will the bulb A glow in this circuit? Give reason.

Q.

Question 23

A torch is not functioning, though the contact points in the torch are in working condition. What can be the possible reasons for this? Mention any three.

Q.

A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reasons for this? Mention any three.

Q. The flow of electrons is called _________.

1. electric current
2. water current
3. chemical current
4. air current

Q.

Question 4

Complete the drawing shown in Fig. to indicate where the free ends of the two wires should be joined to make the bulb glow.

Q.

Question 5

In the circuit shown below, when the switch is moved to ‘ON’ position,

(a) the bulb A will glow first.

(b) the bulb B will glow first.

(c) the bulb C will glow first.

(d) all bulbs will glow together.

Q. Mention different safety measures and precautions while using electricity and electrical appliances.

Q.

Question 21

Fig. A and B, show a bulb connected to a cell in two different ways.

(i) What will be the direction of the current through the bulb in both the cases. (Q to P or P to Q)
(ii) Will the bulb glow in both the cases?
(iii) Does the brightness of the glowing bulb depend on the direction of current through it?

Q.

Question 9

Fig. shows a bulb with its different parts marked as 1, 2, 3, 4 and 5. Which of them label the terminals of the bulb?

Q. Avinash is experimenting with an electric circuit as shown. Which among the following objects can replace the safety pin to complete the circuit?

1. Glass bangle
2. Plastic straw
3. Rubber pipe
4. Steel spoon

Q.

What is a conduction tester? How does it work? Using the conduction tester on an object, it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain. [3 MARKS]

Q.

Question 4

In the following arrangement shown in Fig., the bulb will not glow if the ends A and B are connected with

(a) A steel spoon

(b) A metal clip

(c) A plastic clip

(d) A copper wire

Q. A complete and continuous path for electricity to flow between the cell and the bulb is called an electric circuit.

1. True
2. False

Q.

Question 19

Paheli wanted to glow a torch bulb using a cell. She could not get connecting wires, instead, she got two strips of aluminium foil. Will she succeed? Explain, how?

Q. what is the other name for a switch

Q.

Question 11

Will the bulb glow in the circuit shown in Fig.? Explain. What can be done to light the bulb?

Q.

Instead of metal wires, a jute string can be used to make a circuit. (True or False)

1. True
2. False

Q.

Handles of electrical appliances are made up of insulators

1. True
2. False

Q. Which of the following statement about an electric circuit is correct?

1. The wires should have a break or a gap for circuit to be closed.
2. It should have only one electric cell.
3. The circuit is closed only when the switch is in ON position.
4. The circuit is open only when the switch is in ON position.

Q.

Question 2 (b)

Mark 'True' or 'False' for following statement:

Instead of metal wires, a jute string can be used to make a circuit.

Q. Why it is advised to be careful with handling an electric appliances

Q. Avinash is experimenting with an electric circuit as shown. Which among the following objects can replace the safety pin to complete the circuit?

1. Steel spoon
2. Glass bangle
3. Rubber pipe
4. Plastic straw

Q. Which of the following is/are commonly used in a simple electric circuit?

1. Connecting wires
2. Cell
3. Switch
4. All of the above

Q.

Question 8

In which of the following circuits A, B and C given in Fig., the cell will be used up very rapidly?