Numerical MCQs on Electric Current and Ohm’s Law

1. A wire has a resistance of 4Ω when its temperature is 0∘C. When the

temperature increases to 50∘C, the resistance increases to 5Ω. The
temperature coefficient of resistance of the material of the wire is:
a) 0.0025C−1
b) 0.0015C−1
c) 0.0050C−1
d) 0.0035C−1
Answer: a) 0.0025C−1
2. The resistance of a conductor is 12Ω. If a potential difference of 6V is applied
across it, the current flowing through the conductor will be:
a) 0.5A
b) 1.0A
c) 0.25A
d) 2.0A
Answer: a) 0.5A
3. A copper wire of resistance 0.25Ω is connected to a 12V battery. If the wire
has a length of 2m, what is the current flowing through the wire?
a) 48A
b) 6A
c) 3.0A
d) 24A
Answer: a) 48A
4. What is the current passing through a 5Ω resistor connected across a 30V
battery?
a) 6A
b) 5.0A
c) 4.5A
d) 7.5A
Answer: a) 6A
5. The potential difference across a conductor is 10V and the resistance is 5Ω.
What is the power consumed by the conductor?
a) 50W
b) 20W
c) 30W
d) 10W
Answer: a) 50W
6. A circuit has a resistance of 2Ω and is connected to a 12V battery. What is the
power consumed?
a) 72W
b) 6W
c) 12W
 d) 24W
Answer: a) 72W
7. The resistance of a wire is 0.6Ω. If a current of 3A is passed through it, the
potential difference across the wire will be:
a) 1.8V
b) 2.4V
c) 3.0V
d) 0.9V
Answer: a) 1.8V
8. A resistor of resistance 10Ω is connected to a 60V supply. The power
consumed by the resistor is:
a) 360W
b) 600W
c) 540W
d) 720W
Answer: a) 360W
9. If the resistance of a wire is doubled, then the current will be reduced by a
factor of:
a) 1
b) 2
c) 4
d) 8
Answer: b) 2
10. A conductor has a resistance of 10Ω. When the potential difference
across it is 20V, the current flowing is:
a) 2A
b) 4A
c) 0.5A
d) 1.0A
Answer: a) 2A
11. In a circuit, if the voltage is kept constant and the resistance is doubled,
the current will:
a) Remain the same
b) Double
c) Half
d) Become zero
Answer: c) Half
12. A wire of resistance R is stretched so that its length is doubled. The
new resistance will be:
a) 4R
b) 2R
c) R
 d) R/2
Answer: a) 4R
13. A 5Ω resistor is connected across a 10V battery. The power consumed
by the resistor is:
a) 10W
b) 20W
c) 5W
d) 2W
Answer: b) 20W
14. If a conductor has a resistance of 2Ω and a current of 5A flows through
it, the potential difference across the conductor will be:
a) 10V
b) 15V
c) 20V
d) 25V
Answer: a) 10V
15. The current through a resistor of resistance 10Ω is 2A. The power
dissipated is:
a) 20W
b) 40W
c) 50W
d) 10W
Answer: a) 20W

Analysis-Based MCQs on Electric Current and Ohm’s Law

1. If the temperature of a conductor is increased, its resistance increases. What
is the effect on the current if the voltage remains constant?
a) Current increases
b) Current decreases
c) Current remains unchanged
d) Current becomes zero
Answer: b) Current decreases
2. Two resistors of resistances R1=4Ω and R2=6Ω are connected in parallel.
What is the total resistance?
a) 10Ω
b) 2.4Ω
c) 12Ω
d) 1.5Ω
Answer: b) 2.4Ω
3. A battery with EMF V and internal resistance r is connected to a load
resistance R. What happens to the current when R is increased?
a) Current increases
b) Current decreases
 c) Current remains unchanged
d) Cannot be determined
Answer: b) Current decreases
4. In a series circuit, the total resistance is the sum of individual resistances.
What happens to the current in a series circuit when the total resistance
increases?
a) The current increases
b) The current decreases
c) The current remains unchanged
d) The current becomes zero
Answer: b) The current decreases
5. When a conductor is stretched, its length increases. How does the resistance
change?
a) Resistance decreases
b) Resistance increases
c) Resistance remains unchanged
d) Cannot be determined
Answer: b) Resistance increases
6. If the voltage across a conductor is doubled, what happens to the current
through it (assuming resistance remains constant)?
a) The current is halved
b) The current is doubled
c) The current remains unchanged
d) The current is quadrupled
Answer: b) The current is doubled
7. What is the effect of increasing the temperature of a conductor on its
resistivity?
a) Resistivity decreases
b) Resistivity increases
c) Resistivity remains the same
d) Resistivity becomes zero
Answer: b) Resistivity increases
8. If a resistor is connected in a parallel circuit, what happens to the total
resistance as more resistors are added?
a) Total resistance increases
b) Total resistance decreases
c) Total resistance remains the same
d) Cannot be determined
Answer: b) Total resistance decreases
9. What happens to the current in a circuit if the power supply voltage is
increased and the resistance remains constant?
a) Current decreases
b) Current increases
 c) Current remains unchanged
d) Cannot be determined
Answer: b) Current increases
10. In a circuit, if the power dissipated is constant, what happens to the
current if the resistance is doubled?
a) The current increases
b) The current decreases
c) The current remains the same
d) The current becomes zero
Answer: b) The current decreases
11. If the resistances in a parallel circuit are identical, what is the total
resistance?
a) Equal to one of the resistances
b) Half of one resistance
c) Double of one resistance
d) A fraction of one resistance
Answer: a) Equal to one of the resistances
12. In a series circuit with multiple resistors, what happens to the total
resistance as the number of resistors increases?
a) Total resistance increases
b) Total resistance decreases
c) Total resistance remains constant
d) Cannot be determined
Answer: a) Total resistance increases
13. What happens to the power dissipated in a resistor if the current is
halved and the voltage is kept constant?
a) Power is halved
b) Power is quartered
c) Power remains unchanged
d) Power is doubled
Answer: b) Power is quartered
14. In a parallel circuit, what happens if one resistor is removed?
a) Total resistance increases
b) Total resistance decreases
c) Current remains the same
d) The circuit becomes open
Answer: a) Total resistance increases
15. What is the effect on the current in a circuit when both voltage and
resistance are doubled?
a) Current remains the same
b) Current is halved
c) Current is doubled
 d) Current is quadrupled
Answer: a) Current remains the sa

Medium Difficulty – MCQs on Combination of Resistors

1. Two resistors R1=6Ω and R2=3Ω are connected in parallel. What is the total
resistance?
 a) 2Ω
 b) 9Ω
 c) 1.8Ω
 d) 0.6Ω
Answer: c) 1.8Ω
2. In a parallel circuit, two resistors R1=12Ω and R2=6Ω are connected. If the
total current flowing in the circuit is 2A, what is the total voltage across the
resistors?
 a) 18V
 b) 24V
 c) 12V
 d) 6V
Answer: a) 18V
3. A resistor of 10Ω is connected in parallel with a combination of two resistors,
5Ω and 10Ω, connected in series. What is the total resistance of the
combination?
 a) 12Ω
 b) 8Ω
 c) 15Ω
 d) 10Ω
Answer: b) 8Ω
4. Three resistors R1=4Ω, R2=6Ω, and R3=8Ω are connected in series. What is
the total resistance?
 a) 12Ω
 b) 18Ω
 c) 8Ω
 d) 6Ω
Answer: b) 18Ω
5. In a series combination of two resistors R1=4Ω and R2=8Ω, the total current is
2A. The potential difference across the resistors is:
 a) 24V
 b) 12V
 c) 32V
 d) 10V
Answer: a) 24V
6. If two resistors R1=2Ω and R2=6Ω are connected in series, what is the total
resistance?
  a) 4Ω
 b) 8Ω
 c) 12Ω
 d) 18Ω
Answer: b) 8Ω
7. In a circuit with resistors R1=6Ω and R2=3Ω, connected in parallel, what is the
total resistance?
 a) 4Ω
 b) 1.8Ω
 c) 2Ω
 d) 6Ω
Answer: c) 2Ω
8. If three resistors R1=5Ω, R2=10Ω, and R3=15Ω are connected in series, what
is the total resistance?
 a) 25Ω
 b) 20Ω
 c) 30Ω
 d) 40Ω
Answer: c) 30Ω
9. If two resistors R1=3Ω and R2=5Ω are connected in parallel, what is the total
resistance?
 a) 1.8Ω
 b) 1.875Ω
 c) 2.5Ω
 d) 8Ω
Answer: b) 1.875Ω
10. If two resistors R1=12Ω and R2=4Ω are connected in parallel, the total
current is 3 A. What is the total voltage across the combination?
 a) 12V
 b) 15V
 c) 8V
 d) 18V
Answer: a) 12V

Hard Difficulty – MCQs on Combination of Resistors

11. Four resistors R1=3Ω, R2=6Ω, R3=12Ω, and R4=24Ω are connected in
series. What is the total resistance?
 a) 20Ω
 b) 40Ω
 c) 35Ω
 d) 45Ω
Answer: d) 45Ω
12. Two resistors R1=8Ω and R2=16Ω are connected in series, and this
combination is connected in parallel with a 12Ω resistor. What is the total
resistance?
 a) 8Ω
 b) 10Ω
 c) 6.86Ω
 d) 7.5Ω
Answer: c) 6.86Ω
13. In a combination of resistors, if R1=6Ω and R2=3Ω are in parallel and
the combination is connected in series with R3=2Ω, what is the total
resistance?
 a) 4.5Ω
 b) 8Ω
 c) 10Ω
 d) 12Ω
Answer: b) 8Ω
14. If resistors R1=4Ω, R2=6Ω, and R3=8Ω are connected in parallel, what is
the total resistance?
 a) 3Ω
 b) 2.4Ω
 c) 2Ω
 d) 3.2Ω
Answer: c) 2Ω
15. In a circuit with two resistors in series, if one resistor is 20Ω and the
other is 10Ω, and the total current in the circuit is 1 A, what is the total voltage
across the resistors?
 a) 30V
 b) 25V
 c) 35V
 d) 45V
Answer