# Current Electricity Class 12 Physics Important Questions

Students can read the important questions given below for Current Electricity Class 12 Physics. All Current Electricity Class 12 Notes and questions with solutions have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS. You should read all notes provided by us and Class 12 Physics Important Questions provided for all chapters to get better marks in examinations. Physics Question Bank Class 12 is available on our website for free download in PDF.

## Important Questions of Current Electricity Class 12

Question: The efficiency of kettle A is
1. 63.34%
2. 83.34%
3. 93.34%
4. 73.34%

2

Question: Efficiency of kettle B is
1. 82.5%
2. 72.5%
3. 92.5%
4. 62.5%

4

Question: Statement 1: An electric bulb is first connected to a dc source and then to an ac source having the same brightness in both cases.
Statement 2: The peak value of voltage for an A.C. source is √2 times the root mean square voltage.

A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

E

Question: Statement 1: Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then the rest of the half portion becomes hotter.
Statement 2: Resistances decrease due to a decrease in temperature and so current through wire increases.

A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

Question: Statement 1: Through the same current flows through the line wires and the filament of the bulb but the heat produced in the filament is much higher than that in line wires.
Statement 2: The filament of bulbs is made of a material of high resistance and a high melting point.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false. E) If Statement I is false but Statement II is true.

A

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

D

Question: Just after closing the switch
1. 2 mA
2. 3 mA
3. 0 mA
4. None of the above

3

Question: Long time after the switch is closed
1. 2 mA
2. 3 mA
3. 6 mA
4. None of the above

1

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

A

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

D

Question: Statement 1: A domestic electrical appliance, working on a three-pin will continue working even if the top pin is removed.
Statement 2: The third pin is used only as a safety device.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

QuestionStatement 1: The presence of water molecules makes separation of ions easier in an electrolyte.
Statement 2: The presence of water molecules in electrolyte decreases the resistance of electrolyte.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

B

Question: The value of EMF 𝐸1is
1. 8 V
2. 6 V
3. 4 V
4. 2 V

3

Question: The resistance 𝑅1 has value
1. 10 ohm
2. 20 ohm
3. 30 ohm
4. 40 ohm

1

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

A

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

A

Question: Statement 1: Electric appliances with a metallic body; e.g. heaters, presses, etc, have three-pin connections, whereas an electric bulb has a two pin connection.
Statement 2: Three-pin connections reduce the heating of connecting cables.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

C

Question: The relation between 𝑅𝐴and the actual value of R is
1. R > 𝑅𝐴
2. R < 𝑅𝐴
3. R = 𝑅𝐴
4. Dependent on E and r

2

Question: The relation between 𝑅𝐵 and the actual value of R is
1. R < 𝑅𝐵
2. R > 𝑅𝐵
3. R = 𝑅𝐵
4. Dependent upon E and r R is nearly 10 ohm ) is

2

Question: Efficiency of a battery when delivering maximum power is
1. 100 %
2. 50 %
3. 90 %
4. 40 %

4

Question: The charge in capacitor C1 is
1. 20 μC
2. 30 μC
3. 40 μC
4. 10 μC

4

Question

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

A

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

C

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

B

Question

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

A

Question: If the resistance of the ammeter is 2 ohm, then the resistance of the voltmeter is:-
1. 1 ohm
2. 2 ohm
3. 3 ohm
4. 4 ohm

3

Question: If the resistance of ammeter is 2 ohm ,then resistance of the resistor which is added in parallel to the voltmeter is
1. ⅗ ohm
2. 2/7 ohm
3. 3/7 ohm
4. None of the above

1

Question: The ratio of 𝑅1/𝑅2 is

4

Question: The ratio of 𝑅2/𝑅3 is

3

Question: The current that passes through the resistance R2 nearest to the V0 is

2

Question: The maximum power rating of a 20.0 ohm fuse wire is 2.0 kW,then this fuse wire can be connected safely to a DC source (negligible internal resistance) of
1. 300 volt
2. 190 volt
3. 250 volt
4. 220 volt

2

Question: The charge in capacitor C2 is
1. 30 μC
2. 10 μC
3. 20 μC
4. 40 μC

3

Question: The charge on capacitor C3 is
1. 10 μC
2. 30 μC
3. 20 μC
4. 40 μC

2

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

D

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

D

Question: Statement 1: The possibility of an electric bulb fusing is higher at the time of switching ON and OFF
Statement 2: Inductive effects produce a surge at the time of switch ON and OFF
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

Question: Statement 1: The 200 W bulbs glow with more brightness than 100 W bulbs.
Statement 2: A 100 W bulb has more resistance than a 200 W bulb.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

Question: Just after reopening the switch
1. 2 mA
2. 3 mA
3. 6 mA
4. None of the above

1

Question: Two fuse wires of same potential material are having length ratio 1:2 and ratio 4:1 Then respective ratio of their current rating will be
1. 8:1
2. 2:1
3. 1:8
4. 4:1

1

Question: Find the voltmeter reading after the connection of the resistance.
1. 1 V
2. 2 V
3. 3 V
4. 4 V

2

Question: Ratio of efficiency consumed charges for one time boiling of tea in kettle A to that in kettle B
1. 3:5
2. 2:3
3. 3:4
4. 1:1

3

Question: If the resistance of the coil in kettle A and B is Ra and Rb then we can say
1. Ra>Rb
2. Ra=Rb
3. Ra<Rb
4. Data insufficient

2

Question: If both the kettles are joined with the same source in series one after another then boiling starts in kettle A and kettle B after
1. 4 times of their original time
2. Equal to their original time
3. 2 times of their original time
4. Data insufficient

1

Question: Equivalent resistance of the speakers is
1. 12 ohm
2. 7/3 ohm
3. 8/3 ohm
4. 0.375 ohm

3

Question: Statement 1: Fuse wire must have high resistance and low melting point.
Statement 2: Fuse is used for small current flow only.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

C

QuestionStatement 1: Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more.
Statement 2: In series combination, power is directly proportional to the resistance of the circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

QuestionStatement 1: Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament are connected in series. Metallic bulbs will glow more brightly than a carbon filament bulb.
Statement 2: Carbon is a semiconductor.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

D

Question: The total current supplied by music system
1. 2.25 A
2. 1 A
3. 16 A
4. 1.5 A

1

Question: The power dissipated in the 4 ohm resistance is
1. 9 W
2. 4.5 W
3. 13.5 W
4. 0

1

Question: The resistance 𝑅2 has value
1. 10 ohm
2. 20 ohm
3. 30 ohm
4. 40 ohm

1

QuestionStatement 1: In practical application, the power rating of resistance is not important.
Statement 2: Property of resistance remain the same even at high temperature.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

D

QuestionStatement 1: Leclanche cell is used, when a constant supply of electric current is not required.
Statement 2: The e.m.f. of a Leclanche cell falls, if it is used continuously.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

Question:

A) If both Statement I and Statement II are true and the statement II is the correct explanation of the statement I.
B) If both Statement I and Statement II are true but statement II is not the correct explanation of the statement I.
C) If Statement I is true but Statement II is false.
D) If the Statement I and Statement II both are false.
E) If Statement I is false but Statement II is true.

A

QuestionStatement 1: In the given circuit if lamp B or C fuses then the light emitted by lamp A decreases.
Statement 2: Voltage on A decreases.
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.

A

QuestionStatement 1: If three identical bulbs are connected in series as shown in figure then on closing the switches. Bulb C short-circuited and hence illumination of bulbs A and B decreases.
Statement 2: Voltage on A and B decreases
A) If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
B) If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
C) If Statement 1 is true but Statement 2 is false.
D) If the Statement 1 and Statement 2 both are false.
E) If Statement 1 is false but Statement 2 is true.