Q. What is the effect on the total resistance when more resistors are added in series to a circuit?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
In series, the total resistance increases as more resistors are added.
Correct Answer:
B
— It increases
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Q. What is the equivalent resistance of a 10Ω and a 5Ω resistor connected in parallel?
A.
3.33Ω
B.
7.5Ω
C.
15Ω
D.
5Ω
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Solution
R_eq = 1/(1/10 + 1/5) = 3.33Ω.
Correct Answer:
A
— 3.33Ω
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Q. What is the equivalent resistance of a 6Ω and a 3Ω resistor connected in parallel?
A.
2Ω
B.
4Ω
C.
1.5Ω
D.
9Ω
Show solution
Solution
R_eq = 1/(1/6 + 1/3) = 2Ω.
Correct Answer:
B
— 4Ω
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Q. What is the equivalent resistance of a circuit with a 10 ohm and a 5 ohm resistor in series?
A.
15 ohms
B.
5 ohms
C.
10 ohms
D.
20 ohms
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Solution
For resistors in series, R_eq = R1 + R2 = 10 ohms + 5 ohms = 15 ohms.
Correct Answer:
A
— 15 ohms
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Q. What is the equivalent resistance of a circuit with two 10Ω resistors in series and one 5Ω resistor in parallel with them?
A.
5Ω
B.
10Ω
C.
15Ω
D.
20Ω
Show solution
Solution
R_series = 10Ω + 10Ω = 20Ω. R_parallel = 1/(1/20 + 1/5) = 4Ω. Therefore, R_eq = 4Ω.
Correct Answer:
C
— 15Ω
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Q. What is the equivalent resistance of a circuit with two resistors R1 = 10Ω and R2 = 10Ω in parallel?
A.
5Ω
B.
10Ω
C.
20Ω
D.
15Ω
Show solution
Solution
The equivalent resistance in parallel is given by 1/R_total = 1/R1 + 1/R2 = 1/10 + 1/10 = 1/5. Therefore, R_total = 5Ω.
Correct Answer:
A
— 5Ω
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Q. What is the equivalent resistance of three resistors of 2 ohms, 3 ohms, and 6 ohms connected in series?
A.
1 ohm
B.
3 ohms
C.
11 ohms
D.
12 ohms
Show solution
Solution
In series, the equivalent resistance is the sum of the individual resistances: R_eq = R1 + R2 + R3 = 2 + 3 + 6 = 11 ohms.
Correct Answer:
C
— 11 ohms
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Q. What is the equivalent resistance of three resistors of 2Ω, 3Ω, and 5Ω connected in parallel?
A.
1Ω
B.
2Ω
C.
0.83Ω
D.
10Ω
Show solution
Solution
1/Req = 1/R1 + 1/R2 + 1/R3 = 1/2 + 1/3 + 1/5 = 0.8333, thus Req = 1.2Ω.
Correct Answer:
C
— 0.83Ω
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Q. What is the equivalent resistance of three resistors of 2Ω, 3Ω, and 6Ω connected in series?
A.
11Ω
B.
10Ω
C.
9Ω
D.
12Ω
Show solution
Solution
In series, R_eq = R1 + R2 + R3 = 2 + 3 + 6 = 11Ω.
Correct Answer:
A
— 11Ω
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Q. What is the equivalent resistance of three resistors of 2Ω, 3Ω, and 6Ω connected in parallel?
Show solution
Solution
1/R_eq = 1/R1 + 1/R2 + 1/R3 = 1/2 + 1/3 + 1/6 = 1. Therefore, R_eq = 1Ω.
Correct Answer:
A
— 1Ω
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Q. What is the equivalent resistance of three resistors of values 2Ω, 3Ω, and 5Ω connected in parallel?
A.
1Ω
B.
2Ω
C.
0.83Ω
D.
10Ω
Show solution
Solution
1/R_eq = 1/R1 + 1/R2 + 1/R3 = 1/2 + 1/3 + 1/5 = 0.8333, thus R_eq = 1.2Ω.
Correct Answer:
C
— 0.83Ω
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Q. What is the equivalent resistance of three resistors of values 2Ω, 3Ω, and 6Ω connected in parallel?
Show solution
Solution
1/Req = 1/R1 + 1/R2 + 1/R3 = 1/2 + 1/3 + 1/6 = 1. Therefore, Req = 1Ω.
Correct Answer:
B
— 2Ω
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Q. What is the equivalent resistance of three resistors, 2Ω, 3Ω, and 6Ω, connected in series?
Show solution
Solution
In series, the equivalent resistance is the sum of the individual resistances: R_eq = R1 + R2 + R3 = 2Ω + 3Ω + 6Ω = 11Ω.
Correct Answer:
A
— 11Ω
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Q. What is the equivalent resistance of three resistors, R1, R2, and R3, connected in series?
A.
R1 + R2 + R3
B.
1/(1/R1 + 1/R2 + 1/R3)
C.
R1 * R2 * R3
D.
R1 - R2 - R3
Show solution
Solution
In a series connection, the total or equivalent resistance is the sum of the individual resistances.
Correct Answer:
A
— R1 + R2 + R3
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Q. What is the equivalent resistance of two resistors of 10 ohms and 20 ohms connected in series?
A.
30 ohms
B.
20 ohms
C.
10 ohms
D.
5 ohms
Show solution
Solution
In series, the equivalent resistance R_eq = R1 + R2 = 10 ohms + 20 ohms = 30 ohms.
Correct Answer:
A
— 30 ohms
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Q. What is the equivalent resistance of two resistors of 4Ω and 12Ω connected in parallel?
Show solution
Solution
Using the formula for parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/4 + 1/12 = 1/3. Therefore, R_eq = 3Ω.
Correct Answer:
C
— 6Ω
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Q. What is the equivalent resistance of two resistors of 5 ohms and 10 ohms connected in parallel?
A.
3.33 ohms
B.
15 ohms
C.
5 ohms
D.
7.5 ohms
Show solution
Solution
Using the formula for resistors in parallel, 1/R_eq = 1/R1 + 1/R2, we find R_eq = 1 / (1/5 + 1/10) = 3.33 ohms.
Correct Answer:
A
— 3.33 ohms
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Q. What is the equivalent resistance of two resistors of 5Ω and 10Ω connected in parallel?
A.
3.33Ω
B.
5Ω
C.
7.5Ω
D.
15Ω
Show solution
Solution
1/Req = 1/R1 + 1/R2 = 1/5 + 1/10 = 2/10 + 1/10 = 3/10. Therefore, Req = 10/3 = 3.33Ω.
Correct Answer:
A
— 3.33Ω
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Q. What is the equivalent resistance of two resistors, 6 ohms and 3 ohms, connected in series?
A.
2 ohms
B.
3 ohms
C.
9 ohms
D.
18 ohms
Show solution
Solution
In series, the equivalent resistance is the sum: R_eq = R1 + R2 = 6Ω + 3Ω = 9Ω.
Correct Answer:
C
— 9 ohms
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Q. What is the equivalent resistance of two resistors, 6Ω and 3Ω, connected in series?
Show solution
Solution
In series, the equivalent resistance (R_eq) is the sum of the resistances: R_eq = 6Ω + 3Ω = 9Ω.
Correct Answer:
C
— 9Ω
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Q. What is the formula for the equivalent resistance in a balanced Wheatstone bridge?
A.
R_eq = (P + Q)
B.
C.
(R + S)
D.
R_eq = P + Q + R + S
.
R_eq = P
.
.
Q + R
.
.
S
.
R_eq = (P*R)/(Q + S)
Show solution
Solution
The equivalent resistance in a balanced Wheatstone bridge can be calculated using the parallel formula.
Correct Answer:
A
— R_eq = (P + Q)
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Q. What is the formula for the equivalent resistance of two resistors R1 and R2 in series in a Wheatstone bridge?
A.
R1 + R2
B.
R1 * R2 / (R1 + R2)
C.
R1 - R2
D.
1/(1/R1 + 1/R2)
Show solution
Solution
The equivalent resistance of two resistors in series is simply the sum of their resistances: R1 + R2.
Correct Answer:
A
— R1 + R2
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Q. What is the formula for the equivalent resistance of two resistors R1 and R2 in series?
A.
R_eq = R1 + R2
B.
R_eq = R1 * R2 / (R1 + R2)
C.
R_eq = R1 - R2
D.
R_eq = R1 / R2
Show solution
Solution
The equivalent resistance of two resistors in series is simply the sum of their resistances: R_eq = R1 + R2.
Correct Answer:
A
— R_eq = R1 + R2
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Q. What is the main advantage of using a potentiometer over a voltmeter?
A.
It is cheaper.
B.
It provides more accurate measurements.
C.
It is easier to use.
D.
It can measure AC voltages.
Show solution
Solution
A potentiometer provides more accurate measurements because it measures voltage by balancing rather than drawing current from the circuit.
Correct Answer:
B
— It provides more accurate measurements.
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Q. What is the main advantage of using a Wheatstone bridge in measurements?
A.
It is very fast
B.
It provides high accuracy
C.
It is very simple
D.
It requires no power supply
Show solution
Solution
The Wheatstone bridge is known for providing high accuracy in measuring unknown resistances.
Correct Answer:
B
— It provides high accuracy
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Q. What is the main advantage of using a Wheatstone bridge?
A.
It is simple to construct
B.
It provides high accuracy in measurement
C.
It can measure both AC and DC
D.
It is portable
Show solution
Solution
The Wheatstone bridge is known for its high accuracy in measuring unknown resistances.
Correct Answer:
B
— It provides high accuracy in measurement
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Q. What is the main application of a Wheatstone bridge?
A.
Measuring capacitance
B.
Measuring inductance
C.
Measuring resistance
D.
Measuring voltage
Show solution
Solution
The primary application of a Wheatstone bridge is to measure unknown resistances.
Correct Answer:
C
— Measuring resistance
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Q. What is the maximum number of resistors that can be used in a Wheatstone bridge configuration?
A.
2
B.
3
C.
4
D.
Unlimited
Show solution
Solution
A standard Wheatstone bridge configuration uses four resistors.
Correct Answer:
C
— 4
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Q. What is the maximum voltage that can be measured using a potentiometer with a 20 m wire and a potential gradient of 0.1 V/m?
A.
1 V
B.
2 V
C.
20 V
D.
10 V
Show solution
Solution
Maximum voltage = Potential gradient × Length = 0.1 V/m × 20 m = 2 V.
Correct Answer:
C
— 20 V
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Q. What is the potential difference across a 10 ohm resistor carrying a current of 2A?
A.
5V
B.
10V
C.
15V
D.
20V
Show solution
Solution
Using Ohm's law, V = I * R = 2A * 10 ohms = 20V.
Correct Answer:
D
— 20V
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Showing 481 to 510 of 607 (21 Pages)
Current Electricity MCQ & Objective Questions
Current Electricity is a crucial topic in physics that students must master for their exams. Understanding this concept not only helps in grasping fundamental principles but also significantly boosts your performance in objective questions. Practicing MCQs and important questions related to Current Electricity can enhance your exam preparation and increase your chances of scoring higher marks.
What You Will Practise Here
Ohm's Law and its applications
Series and parallel circuits
Electrical power and energy calculations
Resistance, resistivity, and factors affecting resistance
Kirchhoff's laws and their practical applications
Concept of current, voltage, and their relationship
Diagrams and circuit analysis techniques
Exam Relevance
The topic of Current Electricity is frequently tested in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of fundamental concepts, application of formulas, and problem-solving skills. Common question patterns include numerical problems, theoretical questions, and circuit analysis, making it essential to be well-prepared with Current Electricity MCQ questions.
Common Mistakes Students Make
Confusing current with voltage and their units
Misapplying Ohm's Law in complex circuits
Overlooking the effects of temperature on resistance
Failing to differentiate between series and parallel connections
Neglecting to draw circuit diagrams for better understanding
FAQs
Question: What is the formula for calculating electrical power?Answer: The formula for electrical power is P = VI, where P is power, V is voltage, and I is current.
Question: How does resistance change in series and parallel circuits?Answer: In series circuits, total resistance increases, while in parallel circuits, total resistance decreases.
Now is the time to enhance your understanding of Current Electricity! Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your exams. Start solving today and boost your confidence!
