Electric Switches

Q.

Write any three features of fourth generation computer

Q.

Question 22

Think of six activities which use electric current. Also name the devices used to perform the activity.
$\begin{array}{cc}Activityyouperform& Device\\ Example;Getlight& Torch\\ -----------& ---------\\ ----------& ---------\\ ----------& ---------\\ ----------& ---------\\ ----------& ---------\end{array}$

Q. How stabilisers and adaptors work?

Q. Choose the correct statement for a bulb connecting in an electrical circuit.
Statement (i) : The bulb glows only when the switch is in ON condition.
Statement (ii) : The bulb does not glow when the switch is in OFF condition.

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

Q.

Observe the following circuits carefully. In which circuit will the bulb glow.

1. 

2. 

3. 

4. 

Q.

Draw the circuit diagram of a double pole switch in the off position.

Q. What is circuits?

Q.

Question 4
The bulb in the circuit shown in the figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Q. A switch is an instrument which ______.

1. only makes the circuit
2. makes or breaks the circuit
3. only breaks the circuit.
4. increases the current in the circuit.

Q. In the circuit shown in the figure given below:

Which of the following bulbs glow when the switch is in the ‘OFF’ position?

1. Bulbs B and C
2. Bulbs A, B and C
3. Bulb A
4. None of the bulbs glows

Q. N identical capacitors are connected in parallel to a source of PD V. Without disturbing their charges, these capacitors are connected in series. The PD obtained is ?

Q. Electric switch is a device which is used in:

1. Breaking of an electric circuit
   
2. Neither A nor B
   
3. Making of an electric circuit
   
4. Both A and B
   

Q. Label the parts of the given electric torch.​​
[3 marks]​​​​​​​

Q. Label the components of this electric torch.

1. Electric bulb
2. Reflector
3. Electric cell
4. Slide switch

Q.

The source of electricity in a torch is ______________.

Q. What does the above danger sign shown on poles, electric substations indicate?

1. It is to warn people that electricity can be dangerous if not handled properly.
2. It is to warn people that there is ghost.
3. It is to warn people that there is dangerous animal.
4. It indicates that electricity is not dangerous.

Q. Would the bulb glow after completing the circuit​ shown below if instead of the safety pin we​ use an eraser?​​
[2 marks]

Q. If an electric switch is off then:

1. No current flows through the circuit.
2. Excess current flows through the circuit.
3. Less current flows through the circuit.
4. Direction of current gets reversed.

Q. Explain why the bulb would not glow in the arrangement shown in figure below.
[2 marks]

Q.

Question 1 (a)

Fill in the blank:

A device that is used to break an electric circuit is called ___.

Q.

What do electricians use to test circuits and what is continuity test?

Q. The given diagram is a torch containing cells. The torch is not glowing when the switch is ON. Now, it is opened to know the reasons. Which of the following statements are correct regarding the reasons?
(i) Bulb of the torch is fused.
(ii) Cells are not connected properly.(iii) The metal parts of the torch do not make proper contact with the cell.

1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. All (i), (ii) and (iii)

Q.

State whether the following statement is true or false:

When bulbs are connected in series same current flows through them.

1. True
2. False

Q. A switch is a simple device that is used:

1. Either to complete or break a circuit
2. Only to break the circuit
3. Only to complete the circuit
4. Only to fill gaps in the circuit

Q. Identify the devices which will only function when they are switched “ON”.

1. Torch
2. Radio
3. Television
4. Computer
5. Cars
6. Shoes
7. Coffee mug
8. Eraser
9. Pencil

Q. The components required to make a simple series circuit to light a bulb are

1. Wires and cell
2. Both B and C
3. Cell and switch
4. Bulb and wires

Q.

Which device would you use to open and close a circuit?

1. Press

2. Nail

3. Switch

4. Paddle

Q. What is the function of a key (or switch) in an electric circuit ?

Q. The main function of a switch is to

1. Allow charges of flow
2. Complete or break a circuit
3. Make the bulb glow easily
4. Prevent electric shocks

Q. This device is used to open and close an electric circuit.
(a) Electric torch
(b) Electric switch
(c) Fuse
(d) None of these