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 voltage across a capacitor in an AC circuit is 100V and the capacitive reactance is 50Ω, what is the current through the capacitor? (2023)

A. 1A
B. 2A
C. 3A
D. 4A

Solution

Current (I) = Voltage (V) / Capacitive Reactance (XC) = 100V / 50Ω = 2A.

Correct Answer: B — 2A

Q. If the voltage across a capacitor is 100V and the capacitive reactance is 50 ohms, what is the current through the capacitor? (2022)

A. 2 A
B. 1 A
C. 0.5 A
D. 0.25 A

Solution

I = V/Xc = 100/50 = 2 A.

Correct Answer: B — 1 A

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

Solution

Using Ohm's Law, R = V / I = 15 V / 3 A = 5 Ω.

Correct Answer: A — 5 Ω

Q. If the voltage across a resistor is 240V and the resistance is 60 ohms, what is the current flowing through it? (2020)

A. 2A
B. 4A
C. 6A
D. 8A

Solution

I = V / R = 240V / 60Ω = 4A.

Correct Answer: C — 6A

Q. If the voltage across a resistor is doubled, what happens to the current through the resistor, assuming resistance remains constant?

A. Doubles
B. Halves
C. Remains the same
D. Increases by a factor of four

Solution

According to Ohm's Law (V = IR), if voltage is doubled and resistance remains constant, current also doubles.

Correct Answer: A — Doubles

Q. If the voltage across a resistor is doubled, what happens to the current through it?

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

Solution

According to Ohm's law, if voltage is doubled and resistance remains constant, current also doubles.

Correct Answer: A — It doubles

Q. If the voltage across a resistor is doubled, what happens to the power consumed by the resistor? (2020)

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

Solution

Power (P) is given by P = V^2 / R. If V is doubled, P becomes (2V)^2 / R = 4V^2 / R, which is quadrupled.

Correct Answer: C — It quadruples

Q. If the voltage across a resistor is halved, what happens to the current through it? (2020)

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

Solution

According to Ohm's law, if voltage is halved and resistance remains constant, the current also halves.

Correct Answer: B — It halves

Q. If the voltage across a resistor is increased from 5V to 10V, what happens to the current through the resistor if the resistance is constant? (2021)

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

Solution

According to Ohm's law, if voltage increases and resistance remains constant, current will also increase proportionally.

Correct Answer: A — It doubles

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.

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.

Q. If the voltage across an inductor is 100 V and the current through it is 2 A, what is the inductive reactance? (2023)

A. 50 Ω
B. 200 Ω
C. 100 Ω
D. 25 Ω

Solution

Inductive reactance (X_L) is given by X_L = V/I. Here, X_L = 100 V / 2 A = 50 Ω.

Correct Answer: A — 50 Ω

Q. If the voltage across an inductor is 100 V and the current through it is 5 A, what is the inductive reactance? (2023)

A. 20 Ω
B. 25 Ω
C. 50 Ω
D. 100 Ω

Solution

Inductive reactance (X_L) can be calculated using the formula V = I × X_L. Rearranging gives X_L = V/I = 100 V / 5 A = 20 Ω.

Correct Answer: B — 25 Ω

Q. If the voltage across an inductor is 12V and the current is 2A, what is the inductive reactance? (2023)

A. 6Ω
B. 12Ω
C. 24Ω
D. 18Ω

Solution

Inductive reactance XL = V/I = 12V/2A = 6Ω.

Correct Answer: A — 6Ω

Q. If the volume of a gas is doubled at constant temperature, what happens to its pressure?

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

Solution

According to Boyle's Law, at constant temperature, pressure is inversely proportional to volume. Therefore, if the volume is doubled, the pressure is halved.

Correct Answer: B — It halves

Q. If the volume of a gas is doubled while keeping the temperature constant, what happens to the pressure?

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

Solution

According to Boyle's Law, if the volume is doubled, the pressure is halved.

Correct Answer: B — It halves

Q. If the volume of a gas is halved at constant temperature, what happens to its pressure? (2023)

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

Solution

According to Boyle's Law, if the volume is halved, the pressure doubles at constant temperature.

Correct Answer: A — It doubles

Q. If the volume of a gas is halved while keeping the temperature constant, what happens to the pressure?

A. Pressure is halved
B. Pressure remains constant
C. Pressure doubles
D. Pressure quadruples

Solution

According to Boyle's Law, if the volume of a gas is halved at constant temperature, the pressure will double.

Correct Answer: C — Pressure doubles

Q. If the volume of a gas is halved while keeping the temperature constant, what happens to the pressure of the gas?

A. Halves
B. Doubles
C. Remains the same
D. Increases by 50%

Solution

According to Boyle's Law, if the volume is halved, the pressure doubles.

Correct Answer: B — Doubles

Q. If the wavelength of a light wave is doubled, what happens to its frequency? (2020)

A. Doubles
B. Halves
C. Remains the same
D. Quadruples

Solution

Frequency (f) is inversely proportional to wavelength (λ). If λ is doubled, f is halved.

Correct Answer: B — Halves

Q. If the wavelength of a photon is doubled, what happens to its energy? (2019)

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

Solution

Energy is inversely proportional to wavelength (E = hc/λ). If λ is doubled, E is halved.

Correct Answer: B — It halves

Q. If the wavelength of a wave is halved, what happens to its frequency?

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

Solution

Frequency is inversely proportional to wavelength. If the wavelength is halved, the frequency doubles.

Correct Answer: B — It doubles

Q. If the wavelength of light in a vacuum is 600 nm, what is its wavelength in glass (n = 1.5)?

A. 400 nm
B. 600 nm
C. 900 nm
D. 300 nm

Solution

The wavelength in a medium is given by λ' = λ/n. Thus, λ' = 600 nm / 1.5 = 400 nm.

Correct Answer: A — 400 nm

Q. If the wavelength of light in air is 600 nm, what is its wavelength in glass (n=1.5)?

A. 400 nm
B. 450 nm
C. 600 nm
D. 900 nm

Solution

Wavelength in glass (λ') = λ/n = 600 nm / 1.5 = 400 nm.

Correct Answer: A — 400 nm

Q. If the wavelength of light in vacuum is 600 nm, what is its wavelength in water (n = 1.33)? (2023)

A. 450 nm
B. 600 nm
C. 750 nm
D. 800 nm

Solution

Wavelength in medium = Wavelength in vacuum / n. Thus, λ = 600 nm / 1.33 ≈ 450 nm.

Correct Answer: A — 450 nm

Q. If the wavelength of light is halved, what happens to its frequency? (2021)

A. It is halved
B. It remains the same
C. It is doubled
D. It is quadrupled

Solution

Frequency (f) is inversely proportional to wavelength (λ). If λ is halved, f is doubled.

Correct Answer: C — It is doubled

Q. If the wavelength of light is halved, what happens to the energy of the photons? (2020)

A. It is halved
B. It is doubled
C. It remains the same
D. It is quadrupled

Solution

Energy is inversely proportional to wavelength. Halving the wavelength doubles the energy.

Correct Answer: B — It is doubled

Q. If the wavelength of light is halved, what happens to the frequency of the light?

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

Solution

Frequency (f) is inversely proportional to wavelength (λ). If λ is halved, f doubles.

Correct Answer: A — It doubles

Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the minima?

A. They move closer together
B. They move further apart
C. They remain unchanged
D. They disappear

Solution

Halving the wavelength causes the minima to move closer together, as the angle for minima is directly proportional to the wavelength.

Correct Answer: A — They move closer together

Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the first diffraction minimum?

A. It moves closer to the center
B. It moves further from the center
C. It remains unchanged
D. It disappears

Solution

Halving the wavelength results in the first minimum moving closer to the center, as the position of minima is directly related to the wavelength.

Correct Answer: A — It moves closer to the center

Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the angular position of the first minimum in a single-slit diffraction pattern?

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

Solution

Halving the wavelength will halve the angle for the first minimum, as the position of minima is directly proportional to the wavelength.

Correct Answer: C — It halves

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