Major Competitive Exams MCQ & Objective Questions
Major Competitive Exams play a crucial role in shaping the academic and professional futures of students in India. These exams not only assess knowledge but also test problem-solving skills and time management. Practicing MCQs and objective questions is essential for scoring better, as they help in familiarizing students with the exam format and identifying important questions that frequently appear in tests.
What You Will Practise Here
Key concepts and theories related to major subjects
Important formulas and their applications
Definitions of critical terms and terminologies
Diagrams and illustrations to enhance understanding
Practice questions that mirror actual exam patterns
Strategies for solving objective questions efficiently
Time management techniques for competitive exams
Exam Relevance
The topics covered under Major Competitive Exams are integral to various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect to encounter a mix of conceptual and application-based questions that require a solid understanding of the subjects. Common question patterns include multiple-choice questions that test both knowledge and analytical skills, making it essential to be well-prepared with practice MCQs.
Common Mistakes Students Make
Rushing through questions without reading them carefully
Overlooking the negative marking scheme in MCQs
Confusing similar concepts or terms
Neglecting to review previous years’ question papers
Failing to manage time effectively during the exam
FAQs
Question: How can I improve my performance in Major Competitive Exams?Answer: Regular practice of MCQs and understanding key concepts will significantly enhance your performance.
Question: What types of questions should I focus on for these exams?Answer: Concentrate on important Major Competitive Exams questions that frequently appear in past papers and mock tests.
Question: Are there specific strategies for tackling objective questions?Answer: Yes, practicing under timed conditions and reviewing mistakes can help develop effective strategies.
Start your journey towards success by solving practice MCQs today! Test your understanding and build confidence for your upcoming exams. Remember, consistent practice is the key to mastering Major Competitive Exams!
Q. What is the power consumed by a 6Ω resistor when a current of 3A flows through it? (2021)
A.
18W
B.
9W
C.
36W
D.
12W
Show solution
Solution
Power (P) is given by P = I^2 * R = (3A)^2 * 6Ω = 9 * 6 = 54W.
Correct Answer:
A
— 18W
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Q. What is the power consumed by a device that operates at 12 volts and draws a current of 2 amperes? (2020)
A.
24 W
B.
12 W
C.
6 W
D.
48 W
Show solution
Solution
Power (P) is given by P = V * I. Thus, P = 12 V * 2 A = 24 W.
Correct Answer:
A
— 24 W
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Q. What is the power consumed by a device that operates at 120 V and draws a current of 2 A?
A.
240 W
B.
60 W
C.
120 W
D.
30 W
Show solution
Solution
Power (P) is calculated using the formula P = V * I. Therefore, P = 120 V * 2 A = 240 W.
Correct Answer:
A
— 240 W
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Q. What is the power consumed by a device that operates at 120 volts and draws a current of 3 amperes?
A.
360 W
B.
40 W
C.
120 W
D.
240 W
Show solution
Solution
Power P is calculated using P = V * I. Therefore, P = 120 V * 3 A = 360 W.
Correct Answer:
A
— 360 W
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Q. What is the power consumed by a device that operates at 120V and draws a current of 3A? (2021)
A.
360 W
B.
240 W
C.
120 W
D.
30 W
Show solution
Solution
Power (P) = Voltage (V) × Current (I) = 120V × 3A = 360W.
Correct Answer:
A
— 360 W
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Q. What is the power consumed by a device that operates at a voltage of 120 volts and draws a current of 3 amperes?
A.
360 watts
B.
40 watts
C.
120 watts
D.
240 watts
Show solution
Solution
Power (P) is calculated as P = V * I. Thus, P = 120 V * 3 A = 360 W.
Correct Answer:
A
— 360 watts
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Q. What is the power consumed by a resistor of 10 ohms carrying a current of 2 A? (2023)
A.
20 W
B.
40 W
C.
10 W
D.
5 W
Show solution
Solution
Power P = I^2 * R = (2 A)^2 * 10 Ω = 4 * 10 = 40 W.
Correct Answer:
A
— 20 W
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Q. What is the power consumed in an AC circuit with a voltage of 230V and a current of 5A with a power factor of 0.8? (2023)
A.
920W
B.
1150W
C.
115W
D.
460W
Show solution
Solution
Power = V × I × Power Factor = 230V × 5A × 0.8 = 920W.
Correct Answer:
A
— 920W
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Q. What is the power dissipated in a 10Ω resistor carrying a current of 2A?
A.
20W
B.
30W
C.
40W
D.
50W
Show solution
Solution
Power P = I^2 * R = (2A)^2 * 10Ω = 4 * 10 = 40W.
Correct Answer:
A
— 20W
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Q. What is the power dissipated in a 4 ohm resistor carrying a current of 3 A?
A.
12 W
B.
9 W
C.
6 W
D.
3 W
Show solution
Solution
Using the power formula P = I^2 * R, we have P = (3 A)^2 * 4 ohms = 9 * 4 = 36 W.
Correct Answer:
A
— 12 W
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Q. What is the power dissipated in a resistor of 10 ohms carrying a current of 2 A?
A.
20 W
B.
10 W
C.
5 W
D.
40 W
Show solution
Solution
Using the power formula P = I^2 * R, we have P = (2 A)^2 * 10 ohms = 4 * 10 = 40 W.
Correct Answer:
A
— 20 W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 2A?
A.
5W
B.
10W
C.
20W
D.
40W
Show solution
Solution
Power is given by P = I^2 * R = (2A)^2 * 5Ω = 4A^2 * 5Ω = 20W.
Correct Answer:
B
— 10W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 3A?
Show solution
Solution
Power P = I^2 * R = (3A)^2 * 5Ω = 9A^2 * 5Ω = 45W.
Correct Answer:
A
— 15W
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Q. What is the power dissipated in a resistor of 8Ω when a current of 2A flows through it?
A.
4W
B.
8W
C.
16W
D.
32W
Show solution
Solution
Power P = I^2 * R = (2A)^2 * 8Ω = 4A^2 * 8Ω = 32W.
Correct Answer:
C
— 16W
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Q. What is the power factor in a circuit with a phase angle of 60 degrees?
A.
0.5
B.
0.866
C.
1
D.
0
Show solution
Solution
The power factor is cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power factor in a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
Show solution
Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer:
D
— √2/2
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Q. What is the power factor in an AC circuit with a phase angle of 30 degrees? (2022)
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor is cos(30°) = √3/2 ≈ 0.866.
Correct Answer:
B
— 0.866
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Q. What is the power factor of a circuit with a phase angle of 60 degrees?
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power factor of a circuit with a resistance of 30Ω and a reactance of 40Ω? (2023)
A.
0.6
B.
0.75
C.
0.8
D.
1.0
Show solution
Solution
Power factor = R/Z where Z = √(R² + X²). Calculate.
Correct Answer:
A
— 0.6
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Q. What is the power factor of a circuit with a resistance of 4Ω and a reactance of 3Ω? (2021)
A.
0.6
B.
0.8
C.
1.0
D.
0.75
Show solution
Solution
Power factor = R/Z = R/√(R² + X²) = 4/√(4² + 3²) = 4/5 = 0.8.
Correct Answer:
A
— 0.6
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Q. What is the power factor of a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
Show solution
Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer:
D
— √2/2
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Q. What is the power factor of a circuit with a resistance of 5Ω and an inductive reactance of 5Ω? (2022)
A.
0.5
B.
0.707
C.
1
D.
0
Show solution
Solution
Power factor = R/Z = 5 / √(5² + 5²) = 5 / √50 = 0.707.
Correct Answer:
B
— 0.707
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Q. What is the power factor of a circuit with a resistance of 6Ω and a reactance of 8Ω? (2022)
A.
0.75
B.
0.8
C.
0.6
D.
1.0
Show solution
Solution
Power factor = R/Z = R/√(R² + X²) = 6/√(6² + 8²) = 6/10 = 0.6.
Correct Answer:
B
— 0.8
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Q. What is the power factor of a circuit with a resistance of 8Ω and a reactance of 6Ω? (2023)
A.
0.5
B.
0.6
C.
0.8
D.
1.0
Show solution
Solution
Power factor = R/Z, where Z = √(R² + X²) = √(8² + 6²) = 10. Thus, PF = 8/10 = 0.8.
Correct Answer:
C
— 0.8
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Q. What is the power factor of an AC circuit with a phase angle of 60 degrees?
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power factor of an AC circuit with a phase angle of 60°? (2022)
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor is cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power of a lens with a focal length of 50 cm?
A.
+2 D
B.
+1 D
C.
-2 D
D.
-1 D
Show solution
Solution
Power (P) is given by P = 1/f (in meters). Thus, f = 50 cm = 0.5 m, so P = 1/0.5 = +2 D.
Correct Answer:
A
— +2 D
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Q. What is the power output of a motor that does 1200 J of work in 30 seconds?
A.
20 W
B.
40 W
C.
60 W
D.
80 W
Show solution
Solution
Power = Work / Time = 1200 J / 30 s = 40 W.
Correct Answer:
C
— 60 W
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Q. What is the power output of a motor that does 3000 J of work in 15 seconds?
A.
200 W
B.
300 W
C.
400 W
D.
500 W
Show solution
Solution
Power = Work / Time = 3000 J / 15 s = 200 W.
Correct Answer:
B
— 300 W
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Q. What is the power set of A = {a, b}?
A.
{∅, {a}, {b}, {a, b}}
B.
{a, b}
C.
{∅, {a, b}}
D.
{a, b, {a, b}}
Show solution
Solution
The power set of a set is the set of all its subsets. For A = {a, b}, the power set is {∅, {a}, {b}, {a, b}}.
Correct Answer:
A
— {∅, {a}, {b}, {a, b}}
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