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Defence Exams

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Defence Exams MCQ & Objective Questions

Defence Exams play a crucial role in shaping the future of aspiring candidates in India. These exams not only assess knowledge but also test the ability to apply concepts in real-world scenarios. Practicing MCQs and objective questions is essential for effective exam preparation, as it helps students identify important questions and enhances their understanding of key topics.

What You Will Practise Here

Fundamentals of Defence Studies
Key Historical Events and Their Impact
Important Defence Policies and Strategies
Current Affairs Related to National Security
Basic Concepts of Military Operations
Understanding Defence Technologies
Analysing Defence Budget and Expenditure

Exam Relevance

The topics covered in Defence Exams are highly relevant across various educational boards, including CBSE and State Boards, as well as competitive exams like NEET and JEE. Students can expect questions that focus on historical events, current affairs, and fundamental concepts related to defence. Common question patterns include multiple-choice questions that assess both theoretical knowledge and practical application.

Common Mistakes Students Make

Overlooking current affairs, which are often integrated into exam questions.
Confusing similar historical events or dates, leading to incorrect answers.
Neglecting the importance of definitions and key terms in objective questions.
Relying solely on rote memorization instead of understanding concepts.

FAQs

Question: What types of questions can I expect in Defence Exams?
Answer: You can expect a mix of MCQs covering historical events, current affairs, and fundamental concepts related to defence.

Question: How can I improve my performance in Defence Exams?
Answer: Regular practice of MCQs and understanding key concepts will significantly enhance your performance.

Start your journey towards success by solving practice MCQs today! Testing your understanding will not only boost your confidence but also prepare you for the important Defence Exams ahead.

NDA

Q. What is the focus of the parabola defined by the equation y^2 = 20x?

A. (5, 0)
B. (0, 5)
C. (0, 10)
D. (10, 0)

Solution

In the equation y^2 = 4px, we have 4p = 20, thus p = 5. The focus is at (5, 0).

Correct Answer: A — (5, 0)

Q. What is the focus of the parabola given by the equation y^2 = 20x?

A. (5, 0)
B. (0, 5)
C. (0, -5)
D. (10, 0)

Solution

For the parabola y^2 = 4px, here 4p = 20, so p = 5. The focus is at (5, 0).

Correct Answer: A — (5, 0)

Q. What is the formula for calculating electric power? (2023)

A. P = IV
B. P = I^2R
C. P = V^2/R
D. All of the above

Solution

The electric power can be calculated using multiple formulas: P = IV (power = current × voltage), P = I^2R (power = current squared × resistance), and P = V^2/R (power = voltage squared / resistance).

Correct Answer: D — All of the above

Q. What is the formula for calculating the capacitance of a parallel plate capacitor?

A. C = εA/d
B. C = A/εd
C. C = d/εA
D. C = εd/A

Solution

The capacitance (C) of a parallel plate capacitor is given by C = εA/d, where ε is the permittivity, A is the area of the plates, and d is the distance between them.

Correct Answer: A — C = εA/d

Q. What is the formula for calculating the concentration of hydrogen ions in a solution from its pH?

A. [H+] = 10^-pH
B. [H+] = pH/10
C. [H+] = 10^pH
D. [H+] = pH^10

Solution

The concentration of hydrogen ions is calculated using [H+] = 10^-pH.

Correct Answer: A — [H+] = 10^-pH

Q. What is the formula for calculating the concentration of hydrogen ions in a solution with a pH of 5?

A. 1 x 10^-5 M
B. 1 x 10^-7 M
C. 1 x 10^-9 M
D. 1 x 10^-3 M

Solution

The concentration of hydrogen ions is calculated as [H+] = 10^-pH = 10^-5 M.

Correct Answer: A — 1 x 10^-5 M

Q. What is the formula for calculating the normality of a solution?

A. N = M x n
B. N = M / n
C. N = M + n
D. N = M - n

Solution

Normality (N) is calculated as the molarity (M) multiplied by the number of equivalents (n).

Correct Answer: A — N = M x n

Q. What is the formula for calculating the pH of a solution?

A. pH = log[H+]
B. pH = -log[H+]
C. pH = [H+]
D. pH = 14 - pOH

Solution

The formula for calculating pH is pH = -log[H+].

Correct Answer: B — pH = -log[H+]

Q. What is the formula for calculating the power consumed in an electrical circuit?

A. P = IV
B. P = I/R
C. P = V/R
D. P = IR

Solution

The power consumed in an electrical circuit is given by the formula P = IV, where P is power, I is current, and V is voltage.

Correct Answer: A — P = IV

Q. What is the formula for the capacitance of a parallel plate capacitor?

A. C = εA/d
B. C = A/εd
C. C = d/εA
D. C = εd/A

Solution

The capacitance C of a parallel plate capacitor is given by the formula C = εA/d, where ε is the permittivity, A is the area of the plates, and d is the separation between them.

Correct Answer: A — C = εA/d

Q. What is the formula for the total capacitance of two capacitors in parallel?

A. C_total = C1 + C2
B. C_total = C1 * C2
C. C_total = C1 / C2
D. C_total = C1 - C2

Solution

For capacitors in parallel, the total capacitance is the sum: C_total = C1 + C2.

Correct Answer: A — C_total = C1 + C2

Q. What is the frequency of a sound wave with a wavelength of 2 meters traveling at 340 m/s?

A. 170 Hz
B. 340 Hz
C. 680 Hz
D. 3400 Hz

Solution

Frequency = Speed / Wavelength = 340 m/s / 2 m = 170 Hz.

Correct Answer: A — 170 Hz

Q. What is the frequency of an AC signal with a period of 0.02 seconds?

A. 50 Hz
B. 100 Hz
C. 25 Hz
D. 200 Hz

Solution

Frequency (f) is the reciprocal of the period (T). Thus, f = 1/T = 1/0.02 s = 50 Hz.

Correct Answer: B — 100 Hz

Q. What is the function of a capacitor in an electric circuit? (2022)

A. Store energy
B. Increase current
C. Decrease voltage
D. Convert AC to DC

Solution

A capacitor is used to store electrical energy in an electric field, which can be released when needed.

Correct Answer: A — Store energy

Q. What is the function of chlorophyll in plants? (2022)

A. Absorbing water
B. Absorbing sunlight
C. Transporting nutrients
D. Storing energy

Solution

Chlorophyll is the pigment in plants that absorbs sunlight, which is essential for photosynthesis.

Correct Answer: B — Absorbing sunlight

Q. What is the function of chloroplasts in plant cells? (2022)

A. Energy production
B. Photosynthesis
C. Cell division
D. Protein synthesis

Solution

Chloroplasts are the organelles in plant cells where photosynthesis occurs, converting light energy into chemical energy.

Correct Answer: B — Photosynthesis

Q. What is the function of mitochondria in a cell? (2022)

A. Photosynthesis
B. Energy production
C. Protein synthesis
D. Cell division

Solution

Mitochondria are known as the powerhouses of the cell, generating ATP through cellular respiration.

Correct Answer: B — Energy production

Q. What is the function of phloem in plants?

A. Transport of water
B. Transport of food
C. Photosynthesis
D. Storage of nutrients

Solution

Phloem is responsible for the transport of food, particularly the sugars produced during photosynthesis, from the leaves to other parts of the plant.

Correct Answer: B — Transport of food

Q. What is the function of the immune system?

A. To transport oxygen
B. To protect against pathogens
C. To regulate body temperature
D. To digest food

Solution

The immune system protects the body against infections and diseases by identifying and destroying pathogens.

Correct Answer: B — To protect against pathogens

Q. What is the function of the lysosome?

A. Energy production
B. Digestion of waste materials
C. Protein synthesis
D. Photosynthesis

Solution

Lysosomes contain enzymes that break down waste materials and cellular debris.

Correct Answer: B — Digestion of waste materials

Q. What is the function of the skeletal system? (2022)

A. To produce energy
B. To protect internal organs
C. To transport oxygen
D. To regulate hormones

Solution

The skeletal system provides structure and protection for internal organs, making option 2 the correct answer.

Correct Answer: B — To protect internal organs

Q. What is the GDP growth rate of India projected for 2023? (2023)

A. 5.5%
B. 6.0%
C. 6.8%
D. 7.5%

Solution

The GDP growth rate of India is projected to be around 6.8% for 2023.

Correct Answer: C — 6.8%

Q. What is the general solution of the differential equation dy/dx = 3x^2?

A. y = x^3 + C
B. y = 3x^3 + C
C. y = x^2 + C
D. y = 3x^2 + C

Solution

Integrating both sides gives y = ∫3x^2 dx = x^3 + C.

Correct Answer: A — y = x^3 + C

Q. What is the general solution of the differential equation dy/dx = 4y? (2019)

A. y = Ce^(4x)
B. y = Ce^(x/4)
C. y = 4Ce^x
D. y = 4Ce^(4x)

Solution

The differential equation dy/dx = 4y can be solved using separation of variables, leading to y = Ce^(4x).

Correct Answer: A — y = Ce^(4x)

Q. What is the highest peak in India?

A. K2
B. Kangchenjunga
C. Nanda Devi
D. Mount Everest

Solution

Kangchenjunga is the highest peak in India, standing at 8,586 meters.

Correct Answer: B — Kangchenjunga

Q. What is the indefinite integral of e^x? (2020)

A. e^x + C
B. e^x
C. x e^x + C
D. x^2 e^x + C

Solution

The indefinite integral of e^x is e^x + C.

Correct Answer: A — e^x + C

Q. What is the integral of cos(3x) dx?

A. (1/3)sin(3x) + C
B. 3sin(3x) + C
C. (1/3)cos(3x) + C
D. sin(3x) + C

Solution

The integral of cos(3x) is (1/3)sin(3x) + C, where C is the constant of integration.

Correct Answer: A — (1/3)sin(3x) + C

Q. What is the integral of e^(2x) dx?

A. (1/2)e^(2x) + C
B. 2e^(2x) + C
C. e^(2x) + C
D. (1/2)e^(x) + C

Solution

The integral of e^(2x) is (1/2)e^(2x) + C, where C is the constant of integration.

Correct Answer: A — (1/2)e^(2x) + C

Q. What is the integral of e^(2x)? (2023)

A. (1/2)e^(2x) + C
B. 2e^(2x) + C
C. e^(2x) + C
D. (1/2)e^(x) + C

Solution

The integral of e^(2x) is (1/2)e^(2x) + C.

Correct Answer: A — (1/2)e^(2x) + C

Q. What is the integral of e^x dx?

A. e^x + C
B. e^x
C. x e^x + C
D. x e^x

Solution

The integral of e^x is e^x + C, where C is the constant of integration.

Correct Answer: A — e^x + C

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