Q. A 10-ohm resistor has a voltage of 20 volts across it. What is the current flowing through the resistor?
A.
1 A
B.
2 A
C.
3 A
D.
4 A
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Solution
Using Ohm's Law, I = V / R = 20 V / 10 Ω = 2 A.
Correct Answer:
B
— 2 A
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Q. A 10-ohm resistor has a voltage of 50 volts across it. What is the current flowing through the resistor?
A.
5 A
B.
10 A
C.
15 A
D.
20 A
Show solution
Solution
Using Ohm's Law, I = V / R = 50 V / 10 Ω = 5 A.
Correct Answer:
B
— 10 A
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Q. A 10-ohm resistor is connected to a 20-volt battery. What is the power dissipated by the resistor?
A.
40 W
B.
20 W
C.
10 W
D.
2 W
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Solution
Power (P) can be calculated using P = V^2 / R = 20^2 / 10 = 400 / 10 = 40 W.
Correct Answer:
A
— 40 W
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Q. A circuit has a voltage of 12 volts and a resistance of 4 ohms. What is the current flowing through the circuit?
A.
3 A
B.
4 A
C.
2 A
D.
1 A
Show solution
Solution
Using Ohm's Law, I = V / R = 12 V / 4 Ω = 3 A.
Correct Answer:
A
— 3 A
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Q. A circuit has a voltage of 12V and a resistance of 4Ω. What is the current flowing through the circuit?
A.
3A
B.
4A
C.
12A
D.
48A
Show solution
Solution
Using Ohm's Law, I = V/R = 12V / 4Ω = 3A.
Correct Answer:
A
— 3A
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Q. A circuit has a voltage of 24 volts and a current of 6 amperes. What is the resistance?
A.
4 Ω
B.
6 Ω
C.
8 Ω
D.
12 Ω
Show solution
Solution
Using Ohm's Law, R = V / I = 24 V / 6 A = 4 Ω.
Correct Answer:
A
— 4 Ω
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Q. A resistor of 10 ohms is connected to a 20V battery. What is the current flowing through the resistor?
A.
0.5 A
B.
1 A
C.
2 A
D.
5 A
Show solution
Solution
Using Ohm's Law, I = V/R = 20V / 10Ω = 2 A.
Correct Answer:
C
— 2 A
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Q. If a 10Ω resistor is connected to a 20V battery, what is the power dissipated by the resistor?
A.
20W
B.
40W
C.
100W
D.
200W
Show solution
Solution
Power (P) can be calculated using P = V^2/R. Here, P = 20V^2 / 10Ω = 400 / 10 = 40W.
Correct Answer:
B
— 40W
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Q. If a 12V battery is connected across a 4 ohm resistor, what is the power dissipated in the resistor?
A.
12 W
B.
24 W
C.
36 W
D.
48 W
Show solution
Solution
Power (P) can be calculated using P = V^2 / R = 12V^2 / 4Ω = 144 / 4 = 36 W.
Correct Answer:
B
— 24 W
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Q. If a 12V battery is connected to a 4 ohm resistor, what is the power dissipated by the resistor?
A.
12 W
B.
24 W
C.
36 W
D.
48 W
Show solution
Solution
Power (P) can be calculated using P = V^2 / R = 12V^2 / 4Ω = 36 W.
Correct Answer:
B
— 24 W
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Q. If a 60W light bulb operates at 120V, what is the resistance of the bulb?
A.
240 ohms
B.
120 ohms
C.
60 ohms
D.
30 ohms
Show solution
Solution
Power (P) = V^2 / R, so R = V^2 / P = (120V)^2 / 60W = 240 ohms.
Correct Answer:
B
— 120 ohms
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Q. If a circuit has a current of 0.5 A and a resistance of 20 ohms, what is the voltage?
A.
10 V
B.
5 V
C.
15 V
D.
20 V
Show solution
Solution
Using Ohm's Law, V = I * R = 0.5 A * 20 Ω = 10 V.
Correct Answer:
A
— 10 V
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Q. If a circuit has a current of 3 A and a resistance of 4 ohms, what is the voltage across the circuit?
A.
7 V
B.
12 V
C.
15 V
D.
20 V
Show solution
Solution
Using Ohm's Law, V = IR = 3 A * 4 Ω = 12 V.
Correct Answer:
B
— 12 V
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Q. If a circuit has a current of 5 A and a resistance of 10 Ω, what is the power consumed in the circuit?
A.
50 W
B.
25 W
C.
10 W
D.
5 W
Show solution
Solution
Power (P) can be calculated using P = I^2 * R = (5 A)^2 * 10 Ω = 25 A^2 * 10 Ω = 250 W.
Correct Answer:
A
— 50 W
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Q. If a circuit has a current of 5 A and a resistance of 10 Ω, what is the voltage?
A.
50 V
B.
5 V
C.
10 V
D.
15 V
Show solution
Solution
Using Ohm's Law, V = I * R = 5 A * 10 Ω = 50 V.
Correct Answer:
A
— 50 V
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Q. If a circuit has a current of 5 amperes and a resistance of 10 ohms, what is the voltage?
A.
50 volts
B.
5 volts
C.
10 volts
D.
15 volts
Show solution
Solution
Using Ohm's Law, V = I * R = 5 A * 10 Ω = 50 V.
Correct Answer:
A
— 50 volts
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Q. If a circuit has a voltage of 24 volts and a current of 6 amperes, what is the resistance?
A.
4 Ω
B.
6 Ω
C.
8 Ω
D.
12 Ω
Show solution
Solution
Using Ohm's Law, R = V / I = 24 V / 6 A = 4 Ω.
Correct Answer:
C
— 8 Ω
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Q. If a resistor has a resistance of 5 ohms and a current of 2 amperes flows through it, what is the voltage across the resistor?
A.
10 V
B.
5 V
C.
2.5 V
D.
1 V
Show solution
Solution
Using Ohm's Law, V = I * R = 2 A * 5 Ω = 10 V.
Correct Answer:
A
— 10 V
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Q. If a resistor is connected to a 9V battery and the current flowing through it is 3A, what is the resistance of the resistor?
A.
1 Ω
B.
3 Ω
C.
9 Ω
D.
27 Ω
Show solution
Solution
Using Ohm's Law, R = V / I = 9 V / 3 A = 3 Ω.
Correct Answer:
C
— 9 Ω
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Q. If the current in a circuit is 5 A and the resistance is 2 ohms, what is the power consumed in the circuit?
A.
10 W
B.
25 W
C.
5 W
D.
2.5 W
Show solution
Solution
Power (P) can be calculated using P = I^2R = (5 A)^2 * 2 Ω = 25 W.
Correct Answer:
B
— 25 W
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Q. If the current in a circuit is doubled while the resistance remains constant, what happens to the voltage?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Ohm's Law, if the current (I) is doubled and resistance (R) remains constant, the voltage (V) must also double.
Correct Answer:
A
— It doubles
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Q. If the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?
A.
It doubles.
B.
It halves.
C.
It remains the same.
D.
It quadruples.
Show solution
Solution
According to Ohm's Law (I = V/R), if resistance (R) is doubled and voltage (V) remains constant, the current (I) will be halved.
Correct Answer:
B
— It halves.
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Q. If the resistance of a circuit is doubled while the voltage remains constant, what happens to the current?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Ohm's Law, I = V/R. If R is doubled, the current I will be halved.
Correct Answer:
B
— It halves
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Q. If the voltage across a conductor is 15 volts and the current is 3 amperes, what is the resistance?
A.
5 Ω
B.
10 Ω
C.
15 Ω
D.
20 Ω
Show solution
Solution
Using Ohm's Law, R = V / I = 15 V / 3 A = 5 Ω.
Correct Answer:
A
— 5 Ω
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Q. If the voltage across a resistor is tripled, what happens to the current through it, assuming resistance remains constant?
A.
It triples.
B.
It doubles.
C.
It remains the same.
D.
It decreases.
Show solution
Solution
According to Ohm's Law (I = V/R), if voltage (V) is tripled and resistance (R) remains constant, the current (I) will also triple.
Correct Answer:
A
— It triples.
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Q. In a circuit, if the voltage is increased from 5V to 15V while the resistance remains constant at 5 ohms, what is the change in current?
A.
Increases by 1 A
B.
Increases by 2 A
C.
Increases by 3 A
D.
Increases by 4 A
Show solution
Solution
Initial current I1 = 5V / 5Ω = 1 A; Final current I2 = 15V / 5Ω = 3 A; Change in current = I2 - I1 = 3 A - 1 A = 2 A.
Correct Answer:
C
— Increases by 3 A
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Q. In a circuit, if the voltage is increased while keeping the resistance constant, what happens to the current?
A.
It decreases
B.
It increases
C.
It remains constant
D.
It becomes zero
Show solution
Solution
According to Ohm's Law, if voltage increases and resistance remains constant, the current will increase.
Correct Answer:
B
— It increases
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Q. In a circuit, if the voltage is increased while the resistance remains constant, what happens to the current?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
According to Ohm's Law, if the voltage (V) increases and resistance (R) remains constant, the current (I) increases.
Correct Answer:
B
— It increases
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Q. In a parallel circuit, if one resistor fails, what happens to the total current?
A.
It increases.
B.
It decreases.
C.
It remains the same.
D.
It becomes zero.
Show solution
Solution
In a parallel circuit, if one resistor fails, the total current decreases because the total resistance increases.
Correct Answer:
B
— It decreases.
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Q. In a series circuit, if one resistor fails (opens), what happens to the current in the circuit?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It remains the same
Show solution
Solution
In a series circuit, if one resistor fails, the circuit is broken and the current becomes zero.
Correct Answer:
C
— It becomes zero
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Showing 1 to 30 of 44 (2 Pages)
Ohms Law MCQ & Objective Questions
Ohm's Law is a fundamental principle in physics that every student must grasp for their exams. Understanding this law not only aids in solving complex problems but also enhances your ability to tackle objective questions effectively. Practicing Ohm's Law MCQs and objective questions is essential for scoring better in your exams, as it helps reinforce key concepts and improves your problem-solving skills.
What You Will Practise Here
Understanding the relationship between voltage, current, and resistance.
Key formulas related to Ohm's Law, including V = IR.
Applications of Ohm's Law in real-world scenarios.
Identifying and interpreting circuit diagrams involving Ohm's Law.
Solving numerical problems based on Ohm's Law.
Common variations and extensions of Ohm's Law.
Conceptual questions that challenge your understanding of the law.
Exam Relevance
Ohm's Law is a crucial topic in various examinations, including CBSE, State Boards, NEET, and JEE. It frequently appears in both theoretical and numerical formats. Students can expect questions that require them to apply Ohm's Law to solve circuit problems, interpret graphs, or analyze the behavior of electrical components. Familiarity with common question patterns will significantly enhance your exam preparation.
Common Mistakes Students Make
Confusing the units of voltage, current, and resistance.
Misapplying the formula V = IR in complex circuits.
Overlooking the significance of circuit components in practical applications.
Failing to convert units when necessary, leading to incorrect answers.
Neglecting to analyze the direction of current flow in circuit diagrams.
FAQs
Question: What is Ohm's Law?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.
Question: How can I apply Ohm's Law in exams?Answer: You can apply Ohm's Law by using the formula V = IR to solve problems related to voltage, current, and resistance in circuit questions.
Question: Why is practicing Ohm's Law MCQs important?Answer: Practicing Ohm's Law MCQs helps reinforce your understanding, improves your speed in solving problems, and prepares you for various exam formats.
Now is the time to boost your confidence and understanding of Ohm's Law! Dive into our practice MCQs and test your knowledge to excel in your exams.
