Electric Circuit

Q.

The device which is used to measure electric current through a circuit is called a/an ____.

1. Ammeter

2. Voltmeter

3. Ohmmeter

4. Wattmeter

Q.

Why inductor does not allow sudden change in current?

Q.

What is the conventional direction of electric current? How does it differ from the direction of flow of electrons?

Q. Plastic is a good conductor of electricity.

1. True
2. False

Q.

What does 200m mean on a multimeter?

Q. Calculate the heat dissipated in the circuit in 1 minute.

1. 75 J
2. 45 J
3. 150 J
4. 30 J

Q. Explain the meaning of the statement "the current rating of a fuse is $5A$".

Q.

What is the least count of galvanometers?

Q.

For the circuit shown below the student would observe

1. Some reading in both ammeter and voltmeter

2. Some reading on ammeter but no reading in voltmeter

3. No reading in either the ammeter or the voltmeter

4. Some reading in voltmeter but no reading in ammeter

Q. What is the pole fuse? Write down its current rating?

Q. Calculate the heat dissipated in the circuit in 1 minute.

1. 30 J
2. 45 J
3. 75 J
4. 150 J

Q. Describe with the aid of a diagram some form of a fuse which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.

Q.

Draw circuit symbol for a cell.

Q.

What is measured by a voltmeter?

Q. A deflection in the compass needle placed near a current-carrying wire is an example of effect of electric current.

Q.

Question 26
A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5 $\Omega$ when connected to a 10 V battery. Calculate the resistance of the electric lamp.
Now if a resistance of 10 $\Omega$ is connected in parallel with this series combination, what change (if any) in current flowing through 5 $\Omega$ conductors and the potential difference across the lamp will take place? Give reason.

Q. The main fuse is connected in

1. Neutral wire
2. Both earth and the neutral wire
3. Live wire
4. Both the live and earth wire

Q.

A current of 2 amperes (2A) flows through a conductor of resistance $20\Omega$ for 5 minutes. Calculate the amount of heat produced in KJ.

1. 24

2. 36

3. 42

4. 12

Q. Why is it necessary to have an
earth wire installed in a power
circuit, but not in a lighting circuit?

Q. Calculate the heat dissipated in the circuit in 30 seconds.

1. 30 J
2. 45 J
3. 75 J
4. 125 J

Q. The rating of fuse connection in the lighting circuit is

1. 
   
   
   
   
   10 A
   
   
   
   
2. 
   15 A
3. 
   5 A
4. 
   Zero

Q. A circuit with _________________ will glow the brightest (considering all the bulbs and cells to be identical).

1. one bulb and one cell
2. one bulb and two cells in series
3. two bulbs and one cell
4. three bulbs and one cell

Q. In which of type of circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM.

1. Space division
2. Virtual
3. Time division
4. Packet

Q. Identify the power source in the circuit.

1. 
2. 
3. 
4. 

Q. Which of the following is a type of ISDN (Integrated Services Digital Network)?

1. Narrow band
2. Broad band
3. Both $\left(1\right)$ and $\left(2\right)$
4. None of these

Q. If a heater of resistance $100\Omega$ draws a current of $5A$ for $1hour$, then the energy consumed by the heater is:

1. $3600kJ$
2. $9000kJ$
3. $2500kJ$
4. $1800kJ$

Q. Find the current drawn from the supply.

1. 1.5 A
2. 2.0 A
3. 3.0 A
4. 4.5 A

Q. Current flows only through circuit paths.

1. closed
2. open
3. ohmic

Q. Why do electrons move in specified direction?

Q.

What is the conventional direction of electric current? How does it differ from the direction of flow of electrons?