Q. If a circuit has a current of 3 A and a resistance of 4 ohms, what is the power consumed? (2020)
-
A.
12 W
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B.
7 W
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C.
15 W
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D.
9 W
Solution
Power (P) is calculated using P = I^2 * R = (3 A)^2 * 4 ohms = 12 W.
Correct Answer: A — 12 W
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Q. If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power consumed? (2020)
-
A.
12 W
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B.
7 W
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C.
3 W
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D.
1 W
Solution
Power (P) can be calculated using P = I² × R = (3 A)² × 4 Ω = 12 W.
Correct Answer: A — 12 W
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Q. If a circuit has a total resistance of 10 ohms and a current of 3 A flows through it, what is the voltage across the circuit? (2020)
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A.
30 V
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B.
10 V
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C.
3 V
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D.
0.3 V
Solution
Using Ohm's law, V = I × R = 3 A × 10 Ω = 30 V.
Correct Answer: A — 30 V
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Q. If a circuit has a voltage of 12 V and a resistance of 3 ohms, what is the current flowing through the circuit? (2022)
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A.
4 A
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B.
3 A
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C.
2 A
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D.
1 A
Solution
Using Ohm's law (I = V/R), I = 12 V / 3 Ω = 4 A.
Correct Answer: A — 4 A
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Q. If the current through a conductor is doubled, what happens to the heat produced in the conductor? (2020)
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A.
It halves
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B.
It doubles
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C.
It quadruples
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D.
It remains the same
Solution
The heat produced is proportional to the square of the current (H ∝ I²), so if I is doubled, heat becomes 4 times.
Correct Answer: C — It quadruples
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Q. In a series circuit, if one resistor is removed, what happens to the current? (2023)
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A.
It increases
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B.
It decreases
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C.
It remains the same
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D.
It becomes zero
Solution
In a series circuit, removing one resistor breaks the circuit, causing the current to become zero.
Correct Answer: D — It becomes zero
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Q. What happens to the current in a parallel circuit if one branch is removed? (2019)
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A.
Current increases
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B.
Current decreases
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C.
Current remains the same
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D.
Current stops
Solution
In a parallel circuit, removing one branch does not affect the current in the other branches.
Correct Answer: C — Current remains the same
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Q. What happens to the current in a series circuit if one of the components fails? (2019)
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A.
Current increases
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B.
Current decreases
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C.
Current stops
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D.
Current remains the same
Solution
In a series circuit, if one component fails, the current stops flowing through the entire circuit.
Correct Answer: C — Current stops
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Q. What happens to the total current in a parallel circuit if one branch is disconnected? (2023)
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A.
Total current increases
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B.
Total current decreases
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C.
Total current remains the same
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D.
Total current becomes zero
Solution
In a parallel circuit, if one branch is disconnected, the total current decreases.
Correct Answer: B — Total current decreases
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Q. What happens to the total current in a parallel circuit when more branches are added? (2019)
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A.
It decreases
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B.
It increases
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C.
It remains the same
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D.
It becomes zero
Solution
In a parallel circuit, adding more branches increases the total current.
Correct Answer: B — It increases
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Q. What is the charge of one coulomb equivalent to in terms of electric current and time? (2022)
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A.
1 A for 1 s
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B.
1 A for 2 s
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C.
2 A for 1 s
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D.
0.5 A for 1 s
Solution
1 coulomb is the charge that passes through a conductor when a current of 1 ampere flows for 1 second.
Correct Answer: A — 1 A for 1 s
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Q. What is the charge of one coulomb equivalent to in terms of electrons? (2022)
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A.
6.25 x 10^18 electrons
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B.
1.6 x 10^-19 electrons
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C.
3.2 x 10^-19 electrons
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D.
1.0 x 10^18 electrons
Solution
One coulomb is equivalent to approximately 6.25 x 10^18 electrons.
Correct Answer: A — 6.25 x 10^18 electrons
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Q. What is the charge of one coulomb in terms of the number of electrons? (2023)
-
A.
6.25 x 10^18 electrons
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B.
1.6 x 10^-19 electrons
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C.
3.2 x 10^-19 electrons
-
D.
1.0 x 10^18 electrons
Solution
One coulomb is equivalent to approximately 6.25 x 10^18 electrons.
Correct Answer: A — 6.25 x 10^18 electrons
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Q. What is the direction of conventional current? (2021)
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A.
From negative to positive
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B.
From positive to negative
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C.
Random direction
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D.
Depends on the circuit
Solution
Conventional current is defined as the flow of positive charge, which is from positive to negative.
Correct Answer: B — From positive to negative
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Q. What is the effect of increasing the resistance in a circuit while keeping the voltage constant? (2019)
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A.
Current increases
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B.
Current decreases
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C.
Current remains the same
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D.
Voltage increases
Solution
According to Ohm's law, if resistance increases while voltage remains constant, current decreases.
Correct Answer: B — Current decreases
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Q. What is the effect of increasing the temperature of a conductor on its resistance? (2019)
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A.
Resistance decreases
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B.
Resistance increases
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C.
Resistance remains constant
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D.
Resistance fluctuates
Solution
Generally, the resistance of a conductor increases with an increase in temperature.
Correct Answer: B — Resistance increases
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Q. What is the effect of increasing the voltage in a circuit with constant resistance? (2019)
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A.
Current decreases
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B.
Current increases
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C.
Current remains the same
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D.
Resistance increases
Solution
Increasing the voltage while keeping resistance constant will increase the current.
Correct Answer: B — Current increases
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Q. What is the relationship between current (I), charge (Q), and time (t)? (2022)
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A.
I = Q × t
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B.
I = Q / t
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C.
I = t / Q
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D.
I = Q + t
Solution
The relationship is given by I = Q / t, where I is current, Q is charge, and t is time.
Correct Answer: B — I = Q / t
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Q. What is the relationship between current (I), voltage (V), and resistance (R) in a circuit? (2021)
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A.
I = V/R
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B.
I = R/V
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C.
I = V*R
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D.
I = V + R
Solution
The relationship is given by Ohm's law: I = V/R.
Correct Answer: A — I = V/R
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Q. What is the SI unit of electric current? (2021)
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A.
Volt
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B.
Ohm
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C.
Ampere
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D.
Coulomb
Solution
The SI unit of electric current is the Ampere (A).
Correct Answer: C — Ampere
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Q. What is the total current flowing in a circuit with three resistors in parallel, each carrying 2 A? (2021)
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A.
2 A
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B.
4 A
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C.
6 A
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D.
8 A
Solution
In parallel, the total current is the sum of the currents: 2 A + 2 A + 2 A = 6 A.
Correct Answer: C — 6 A
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Q. What is the total current flowing in a parallel circuit with two branches carrying 2 A and 3 A respectively? (2023)
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A.
5 A
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B.
6 A
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C.
1 A
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D.
2.5 A
Solution
In a parallel circuit, the total current is the sum of the currents in each branch: 2 A + 3 A = 5 A.
Correct Answer: A — 5 A
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Q. What is the total current in a parallel circuit with two branches carrying 2 A and 3 A respectively? (2023)
-
A.
5 A
-
B.
6 A
-
C.
1 A
-
D.
2.5 A
Solution
In a parallel circuit, the total current is the sum of the currents in the branches: 2 A + 3 A = 5 A.
Correct Answer: A — 5 A
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Q. What is the total resistance of two resistors, 4 ohms and 6 ohms, connected in series? (2021)
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A.
10 ohms
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B.
24 ohms
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C.
2.4 ohms
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D.
0.67 ohms
Solution
In series, total resistance R = R1 + R2 = 4 Ω + 6 Ω = 10 Ω.
Correct Answer: A — 10 ohms
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Q. Which of the following is a correct expression for electric current? (2022)
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A.
I = V/R
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B.
I = R/V
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C.
I = V × R
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D.
I = V + R
Solution
The correct expression for electric current is I = V/R, according to Ohm's law.
Correct Answer: A — I = V/R
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Q. Which of the following materials is a good conductor of electricity? (2019)
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A.
Rubber
-
B.
Copper
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C.
Glass
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D.
Wood
Solution
Copper is a good conductor of electricity due to its high number of free electrons.
Correct Answer: B — Copper
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Q. Which of the following statements is true about electric current? (2019)
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A.
It is the flow of protons.
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B.
It is the flow of electrons.
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C.
It is the flow of neutrons.
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D.
It is the flow of ions.
Solution
Electric current is defined as the flow of electrons in a conductor.
Correct Answer: B — It is the flow of electrons.
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Q. Which of the following statements is true regarding electric current? (2020)
-
A.
It flows from negative to positive
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B.
It flows from positive to negative
-
C.
It does not require a closed circuit
-
D.
It is independent of voltage
Solution
Electric current flows from positive to negative in a circuit.
Correct Answer: B — It flows from positive to negative
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Showing 1 to 28 of 28 (1 Pages)
