Electric Circuit

Q.

A flash of lightning carries $10C$ Of charge which flows for $0.01s$. What Is the current? If the voltage Is $10mV$, What Is the energy?

Q. The flow of electric charges is known as:

1. electric current
2. voltage
3. potential difference
4. resistance

Q.

What are MCB's? What is the use of it?

Q.

What is the S.I. unit of electric potential?

1. Ampere

2. Volt

3. Volt-meter

4. Coulomb

Q. Question 4
The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your Solution.

Q.

What is meant by the rating of a fuse?

Q.

A fuse wire is connected in _____ before the switch.

1. Neutral wire

2. Earth wire

3. Live wire

4. Either (a) or (c)

Q.

Which of these do you think uses less electrical energy - electric bulb or LED?

Ans) LED will use very little electrical energy .In an electric bulb most of the electrical energy gets converted into heat energy and very little light energy is given out . Whereas in LED more light energy is given out as compared to electric bulb and little heat energy is produced.

Could you please check my answer.

Q.

If the flow of charge is always in the same direction, then it is called ___ current.

Q.

Potential has the same dimensions as :

1. Work

2. Electric field per unit charge

3. Work per unit charge

4. Force per unit charge

Q.

In order to make a battery from two or more cells, the positive terminal of one cell is connected to the negative terminal of the next and vice – versa.

1. True

2. False

Q. A battery is formed when two or more cells are connected together.

1. True
2. False

Q. Question 23
Observing that the bulb does not glow in the circuit shown in Fig 1, Boojho changed the circuit as shown in Fig 2. He observed deflection in the magnetic compass.

(i) What does the deflection of magnetic compass indicate?
(ii) Why did the bulb not glow in Fig. 1?
(iii) What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in Fig. 2?
(iv) What will be observed if the number of cells is increased in the circuit shown in Fig. 2?

Q.

The closed and continuous path of electric current is known as ______.

1. electric loop

2. electric circuit

3. path reactor

4. electric circle

Q. What is the difference between voltage, potential difference and electromotive force?

Q.

The condition for an electric charge to flow from one point to other is that the two points must have:

1. circuit

2. current

3. potential difference

4. cell

Q.

Find the total resistance of the given circuit.

1. 8 Ω

2. 14 Ω

3. 6 Ω

4. 2 Ω

Q.

What is a pole fuse? What is its use?

Q. The m rows each containing n cells in series are joined in parallel. Maximum current is taken from this connection across an external resistance of 3 ohm. If the total no. of cells used = 24 and internal resistance of each cell is 0.5 ohm find the value of m and n.

Q.

What is DC and AC currents

Q.

Why does the needle of a magnetic compass deflect when it is kept beside a current carrying wire?

1. Due to the magnetic effect of current

2. Due to the heating effect of electric current

3. Due to the chemical effect of electric current

4. All of the above

Q.

A dry cell can be reused again and again.

1. True

2. False

Q. The effect of current causes deflection in a compass needle when it is placed near a current-carrying wire.

1. heating
2. magnetic
3. chemical

Q.

A current flowing in a wire always give rise to a ____________round it.

Q. Which of the following can be electroplated with chromium?

1. Bakelite and graphite
2. Graphite and teflon
3. Graphite and steel
4. Steel

Q. If it is the flow of electrons which is called electricity, then why do we say that the electricity flows from the positive to the negative terminal of the battery?

Q.

What are the disadvantages of wiring in series in a house?

Q. A compass needle shows deflection near a current carrying wire because of:

1. lighting effect of electric current
2. chemical effect of electric current
3. magnetic effect of electric current
4. heating effect of electric current

Q.

Draw a diagram of a fuse wire, connected in a fuse socket.

Q.

Does an electric cell contains electrons