Simple Electric Circuit

Q.

Why do we convert AC to DC?

Q.

If an electric switch is open then no current flows through the circuit.

1. True

2. False

Q.

Which particle flows to produce electric current in a metal wire?

1. Neutron

2. Positron

3. Proton

4. Electron

Q.

In an electric circuit the direction of current ___.

1. Positive to negative terminal of the electric cell

2. Negative to positive terminal of the electric cell

3. Current can flow in any direction

4. None of these

Q. Explain the function of a switch in an electric circuit? [2 MARKS]

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. Cells connected in parallel increase the ___ of both the bulb and the cell.

Q. Source of power is not an essential component of an electric circuit.

1. True
2. False

Q.

Which of the following arrangement A, B, C and D given in fig 12.9 should not be set up? Explain, why?

1. 

2. 

3. 

4. 

Q. In which of the following kind of electric circuit, the sum total of resistances increases?

1. Parallel connection

2. Series connection

3. Both (a) or (b)

4. Either (a) or (b)

Q. A slightly divergent beam of charged particles accelerated by a potential difference v propagates from a point a along the axis of a solenoid.the beam is brought into focus at a distance l from the point a at two successive values of magnetic induction b1 and b2.find the specific charge q/m of the particles.

Q. The movement of electrons is opposite to the direction of current in an electric circuit.

1. True
2. False

Q.

What is a circuit diagram?

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

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

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

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

Q.

Choose the correct option:

Statement 1: The following figure correctly represents the conventional direction of flow of current.

Statement 2: The actual direction of flow of electron is opposite to the conventional direction of flow of current.

1. Both statements are true

2. Both statements are false

3. Statement 1 is true and Statement 2 is false

4. Statement 1 is false and Statement 2 is true

Q.

Where is the main fuse located? What is its purpose?

Q.

electrons flow from a higher potential region to a lower potential region. what does this mean ?

Q.

Electric current in a closed cell flows from __________ terminal of an electric cell to __________ terminal

Q. Current flows only when there is a difference of voltage.

1. True
2. False

Q. flow between the positive and negative terminals of the battery connected as power source in a circuit.

1. Resistance
2. Electrons
3. Protons

Q.

Why wasn't the convention changed after it was discovered that electric current is actually the flow of electrons

Q.

In a circuit with one bulb, another bulb is added in series. What happens to the bulbs when current is passed?

1. They do not glow.

2. They glow less brightly.

3. They glow more brightly.

4. They get fused.

Q. If the power rating of a tubelight is 40 watts, calculate the rate at which the tubelight is consuming electricity in Joules per second (J/s).

1. 220 J/s
2. $40\times {10}^3$ J/s
3. 40 J/s
4. 80 J/s

Q.

Which particle's flow produces electric current in a wire?

1. Neutron

2. Proton

3. Positron

4. Electron

Q. A closed switch allows current to pass through it.

1. False
2. True

Q.

When the chemicals in a cell get used up, then:

1. It stops working

2. It works more efficiently

3. It keeps on working as the chemicals have no effect on its working

4. Can't be said

Q. On billion electrons pass from point P towards another point Q in 10^-3 s . What is the current in ampere? What is its direction?

Q. In an electric circuit, current flows:

1. From positive terminal to negative terminal
2. Randomly
3. From negative terminal to positive terminal
4. None of the above

Q. Cells connected in parallel increase the _____ of both the bulb and the cell.

1. length
2. quality
3. lifetime
4. power

Q. What is an electric circuit?

Q.

In a closed electric circuit:

1. the current passes from one terminal of the electric cell to the other

2. the current does not pass from one terminal of the electric cell to the other

3. there is no presence of switch

4. None of these