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
B.
7 W
C.
15 W
D.
9 W
Show solution
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
B.
7 W
C.
3 W
D.
1 W
Show solution
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)
A.
30 V
B.
10 V
C.
3 V
D.
0.3 V
Show solution
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)
A.
4 A
B.
3 A
C.
2 A
D.
1 A
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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)
A.
It halves
B.
It doubles
C.
It quadruples
D.
It remains the same
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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)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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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)
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Current stops
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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)
A.
Current increases
B.
Current decreases
C.
Current stops
D.
Current remains the same
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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)
A.
Total current increases
B.
Total current decreases
C.
Total current remains the same
D.
Total current becomes zero
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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)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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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)
A.
1 A for 1 s
B.
1 A for 2 s
C.
2 A for 1 s
D.
0.5 A for 1 s
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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)
A.
6.25 x 10^18 electrons
B.
1.6 x 10^-19 electrons
C.
3.2 x 10^-19 electrons
D.
1.0 x 10^18 electrons
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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
B.
1.6 x 10^-19 electrons
C.
3.2 x 10^-19 electrons
D.
1.0 x 10^18 electrons
Show solution
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)
A.
From negative to positive
B.
From positive to negative
C.
Random direction
D.
Depends on the circuit
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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)
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Voltage increases
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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)
A.
Resistance decreases
B.
Resistance increases
C.
Resistance remains constant
D.
Resistance fluctuates
Show solution
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)
A.
Current decreases
B.
Current increases
C.
Current remains the same
D.
Resistance increases
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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)
A.
I = Q × t
B.
I = Q / t
C.
I = t / Q
D.
I = Q + t
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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)
A.
I = V/R
B.
I = R/V
C.
I = V*R
D.
I = V + R
Show solution
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)
A.
Volt
B.
Ohm
C.
Ampere
D.
Coulomb
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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)
A.
2 A
B.
4 A
C.
6 A
D.
8 A
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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)
A.
5 A
B.
6 A
C.
1 A
D.
2.5 A
Show solution
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
Show solution
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)
A.
10 ohms
B.
24 ohms
C.
2.4 ohms
D.
0.67 ohms
Show solution
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)
A.
I = V/R
B.
I = R/V
C.
I = V × R
D.
I = V + R
Show solution
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)
A.
Rubber
B.
Copper
C.
Glass
D.
Wood
Show solution
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)
A.
It is the flow of protons.
B.
It is the flow of electrons.
C.
It is the flow of neutrons.
D.
It is the flow of ions.
Show solution
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
B.
It flows from positive to negative
C.
It does not require a closed circuit
D.
It is independent of voltage
Show solution
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)
Current Electricity - Electric Current MCQ & Objective Questions
Understanding "Current Electricity - Electric Current" is crucial for students preparing for school exams and competitive tests in India. This topic not only forms the foundation of many concepts in physics but also features prominently in various examination formats. Practicing MCQs and objective questions helps students grasp the essential principles and enhances their ability to tackle important questions effectively, leading to better scores.
What You Will Practise Here
Definition and understanding of electric current
Ohm's Law and its applications
Calculating resistance, voltage, and current in circuits
Understanding series and parallel circuits
Key formulas related to current electricity
Diagrams illustrating circuit components
Real-life applications of electric current
Exam Relevance
The topic of "Current Electricity - Electric Current" is frequently tested in CBSE, State Boards, NEET, and JEE exams. Students can expect a variety of question patterns, including direct application of formulas, conceptual understanding, and problem-solving scenarios. This makes it essential for students to be well-versed in both theoretical and practical aspects of electric current to excel in their exams.
Common Mistakes Students Make
Confusing the concepts of current, voltage, and resistance
Misapplying Ohm's Law in circuit problems
Overlooking units while calculating electrical quantities
Failing to differentiate between series and parallel circuits
Neglecting the significance of circuit diagrams in problem-solving
FAQs
Question: What is electric current?Answer: Electric current is the flow of electric charge, typically measured in amperes (A), and is a fundamental concept in understanding electricity.
Question: How does Ohm's Law apply to circuits?Answer: Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature remains constant.
Now is the time to enhance your understanding of "Current Electricity - Electric Current". Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your exams. Every question you solve brings you one step closer to mastering this essential topic!
