Major Competitive Exams

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Major Competitive Exams

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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!

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Q. If the current in a circular loop is doubled, what happens to the magnetic field at the center?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

The magnetic field at the center of the loop is directly proportional to the current.

Correct Answer: A — It doubles

Q. If the current in a circular loop is increased, what happens to the magnetic field at the center of the loop?

A. It decreases
B. It increases
C. It remains the same
D. It becomes zero

Solution

According to the Biot-Savart Law, increasing the current in a circular loop increases the magnetic field at the center of the loop.

Correct Answer: B — It increases

Q. If the current in a circular loop is reversed, what happens to the direction of the magnetic field at the center of the loop?

A. It remains the same
B. It reverses
C. It doubles
D. It becomes zero

Solution

Reversing the current in a circular loop reverses the direction of the magnetic field at the center.

Correct Answer: B — It reverses

Q. If the current in a coil is doubled, the magnetic field strength around the coil will?

A. Double
B. Halve
C. Remain the same
D. Increase by four times

Solution

The magnetic field strength around a coil is directly proportional to the current, so if the current is doubled, the magnetic field strength will also double.

Correct Answer: A — Double

Q. If the current in a coil is reversed, what happens to the direction of the magnetic field produced by the coil?

A. It remains the same
B. It reverses
C. It increases
D. It decreases

Solution

Reversing the current in a coil reverses the direction of the magnetic field produced.

Correct Answer: B — It reverses

Q. If the current in a solenoid is doubled, what happens to the magnetic field inside the solenoid?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

The magnetic field inside a solenoid is directly proportional to the current.

Correct Answer: A — It doubles

Q. If the current in a wire is doubled, how does the magnetic field at a point 1 meter away change?

A. It doubles
B. It quadruples
C. It remains the same
D. It halves

Solution

The magnetic field is directly proportional to the current, so it doubles.

Correct Answer: A — It doubles

Q. If the current in a wire is doubled, how does the magnetic field at a point 5 cm away from the wire change?

A. It doubles
B. It quadruples
C. It remains the same
D. It halves

Solution

According to Biot-Savart Law, the magnetic field is directly proportional to the current. Therefore, if the current is doubled, the magnetic field also doubles.

Correct Answer: A — It doubles

Q. If the current in a wire is doubled, how does the magnetic field at a point near the wire change?

A. It remains the same
B. It doubles
C. It quadruples
D. It halves

Solution

According to the Biot-Savart Law, the magnetic field is directly proportional to the current, so if the current is doubled, the magnetic field also doubles.

Correct Answer: B — It doubles

Q. If the current in a wire is doubled, how does the magnetic field at a point near the wire change according to Ampere's Law?

A. It remains the same
B. It doubles
C. It quadruples
D. It halves

Solution

According to Ampere's Law, the magnetic field is directly proportional to the current, so doubling the current will double the magnetic field.

Correct Answer: B — It doubles

Q. If the current in a wire is reversed, what happens to the direction of the magnetic field around the wire?

A. It remains the same
B. It reverses direction
C. It becomes zero
D. It doubles in strength

Solution

Reversing the current in a wire reverses the direction of the magnetic field around it.

Correct Answer: B — It reverses direction

Q. If the current in a wire is reversed, what happens to the direction of the magnetic field around it?

A. It remains the same
B. It reverses
C. It doubles
D. It becomes zero

Solution

Reversing the current in a wire also reverses the direction of the magnetic field around it.

Correct Answer: B — It reverses

Q. If the current in an AC circuit is given by I(t) = I0 cos(ωt), what is the RMS current? (2023)

A. I0/√2
B. I0
C. 2I0
D. I0/2

Solution

RMS current I_rms = I0/√2 for a cosine function.

Correct Answer: A — I0/√2

Q. If the current in an AC circuit is I(t) = 5√2 sin(100t + π/4), what is the RMS current? (2021)

A. 5 A
B. 2.5 A
C. 7.07 A
D. 3.54 A

Solution

The RMS current is I_rms = I_peak / √2 = 5√2 / √2 = 5 A.

Correct Answer: B — 2.5 A

Q. If the current through a 10Ω resistor is 2A, what is the voltage across the resistor?

A. 5V
B. 10V
C. 20V
D. 30V

Solution

Using Ohm's law, V = I * R = 2A * 10Ω = 20V.

Correct Answer: C — 20V

Q. If the current through a conductor is doubled while the resistance remains constant, what happens to the power consumed?

A. It doubles
B. It triples
C. It remains the same
D. It halves

Solution

Power P = I^2 * R. If I is doubled, P becomes (2I)^2 * R = 4I^2 * R, which is four times the original power.

Correct Answer: A — It doubles

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

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

Q. If the current through a conductor is doubled, what happens to the power dissipated in the conductor?

A. It doubles
B. It quadruples
C. It remains the same
D. It halves

Solution

Power P = I^2 * R. If I is doubled, P becomes (2I)^2 * R = 4I^2 * R, which is quadrupled.

Correct Answer: B — It quadruples

Q. If the current through a conductor is doubled, what happens to the resistance if the voltage remains constant?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

According to Ohm's law, V = I * R. If V is constant and I is doubled, R must halve to maintain the equation.

Correct Answer: B — It halves

Q. If the current through a resistor is 2A and the resistance is 5Ω, what is the voltage across the resistor? (2022)

A. 10V
B. 5V
C. 2V
D. 7V

Solution

Using Ohm's Law, V = I * R = 2A * 5Ω = 10V.

Correct Answer: A — 10V

Q. If the current through a resistor is 3A and the resistance is 4Ω, what is the voltage across the resistor?

A. 6V
B. 9V
C. 12V
D. 15V

Solution

Using Ohm's law, V = I * R = 3A * 4Ω = 12V.

Correct Answer: C — 12V

Q. If the current through a resistor is 5A and the resistance is 10Ω, what is the voltage across the resistor? (2022)

A. 50V
B. 5V
C. 10V
D. 15V

Solution

Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.

Correct Answer: A — 50V

Q. If the current through a resistor is doubled, what happens to the power consumed by the resistor?

A. Increases by 2 times
B. Increases by 4 times
C. Remains the same
D. Decreases by 2 times

Solution

Power P = I^2 * R. If I is doubled, P becomes (2I)^2 * R = 4I^2 * R, which is 4 times the original power.

Correct Answer: B — Increases by 4 times

Q. If the current through a resistor is doubled, what happens to the power dissipated in the resistor?

A. It halves
B. It doubles
C. It quadruples
D. It remains the same

Solution

Power P = I^2 * R. If I is doubled, P becomes (2I)^2 * R = 4I^2 * R, which is quadrupled.

Correct Answer: C — It quadruples

Q. If the current through a resistor is tripled, what happens to the power dissipated in the resistor? (2022)

A. Increases by 3 times
B. Increases by 9 times
C. Remains the same
D. Decreases by 3 times

Solution

Power is proportional to the square of the current (P = I²R). If I is tripled, P increases by 3² = 9 times.

Correct Answer: B — Increases by 9 times

Q. If the damping ratio of a system is greater than 1, what type of damping is present?

A. Underdamped
B. Critically damped
C. Overdamped
D. Free oscillation

Solution

A damping ratio greater than 1 indicates overdamped behavior in the system.

Correct Answer: C — Overdamped

Q. If the data set has a mean of 30 and a median of 25, what does this indicate?

A. Data is symmetrical
B. Data is positively skewed
C. Data is negatively skewed
D. Data is uniform

Solution

Since the mean is greater than the median, the data is positively skewed.

Correct Answer: B — Data is positively skewed

Q. If the data set has a mean of 30 and a standard deviation of 10, what is the z-score of the value 40?

A. 0
B. 1
C. 2
D. 3

Solution

Z-score = (X - Mean) / Standard Deviation = (40 - 30) / 10 = 1

Correct Answer: C — 2

Q. If the data set has a mean of 30 and a standard deviation of 10, what is the z-score of a value 40?

A. 1
B. 0
C. 2
D. -1

Solution

Z-score = (X - Mean) / Standard Deviation = (40 - 30) / 10 = 1.

Correct Answer: C — 2

Q. If the data set has a mean of 30 and a variance of 16, what is the standard deviation?

A. 4
B. 5
C. 6
D. 7

Solution

Standard Deviation = √Variance = √16 = 4.

Correct Answer: A — 4

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