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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. If the frequency of an AC circuit is doubled, what happens to the inductive reactance?

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

Solution

Inductive reactance (X_L) is given by X_L = 2πfL. If the frequency (f) is doubled, the inductive reactance also doubles.

Correct Answer: A — It doubles

Q. If the frequency of an AC signal is doubled, what happens to its period?

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

Solution

The period T is the reciprocal of frequency f (T = 1/f). If frequency is doubled, the period halves.

Correct Answer: B — It halves

Q. If the government allocates a budget of ₹500 crores for a scheme and 30% of it is spent on infrastructure, how much is spent on infrastructure?

A. ₹100 crores
B. ₹150 crores
C. ₹200 crores
D. ₹250 crores

Solution

30% of ₹500 crores = 0.30 * 500 = ₹150 crores.

Correct Answer: B — ₹150 crores

Q. If the incidence rate of a disease is 3 cases per 1000 people per year, how many new cases would you expect in a population of 50,000? (2022)

A. 150
B. 200
C. 300
D. 500

Solution

Expected new cases = (Incidence rate × Population) / 1000 = (3 × 50000) / 1000 = 150.

Correct Answer: C — 300

Q. If the inflation rate is 5% and the current price of a commodity is $200, what will be the price after one year? (2023)

A. $210
B. $205
C. $215
D. $220

Solution

Price after one year = Current Price * (1 + Inflation Rate) = 200 * (1 + 0.05) = 200 * 1.05 = $210.

Correct Answer: A — $210

Q. If the interest rate is 4% per annum, how much interest will be earned on a principal of $1,000 after one year? (2023)

A. $40
B. $50
C. $30
D. $20

Solution

Interest = Principal * Rate = 1000 * 0.04 = $40.

Correct Answer: A — $40

Q. If the length of a river is 120 km and it flows at an average speed of 5 km/h, how long will it take for the river to flow from its source to its mouth? (2021)

A. 20 hours
B. 24 hours
C. 30 hours
D. 36 hours

Solution

Time = Distance / Speed = 120 km / 5 km/h = 24 hours.

Correct Answer: B — 24 hours

Q. If the length of a river is 240 km and it flows at an average speed of 4 km/h, how long will it take for the river to flow from its source to the mouth? (2021)

A. 60 hours
B. 70 hours
C. 80 hours
D. 90 hours

Solution

Time = Distance / Speed = 240 km / 4 km/h = 60 hours.

Correct Answer: A — 60 hours

Q. If the length of a side of a square is doubled, what happens to the area? (2023)

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

Solution

Area of square = side². If side is doubled, new area = (2 * side)² = 4 * side², so area quadruples.

Correct Answer: D — It quadruples

Q. If the lengths of the sides of a rectangle are 4 cm and 6 cm, what is its perimeter? (2022)

A. 20 cm
B. 24 cm
C. 10 cm
D. 12 cm

Solution

Perimeter = 2 * (length + width) = 2 * (4 + 6) = 20 cm

Correct Answer: A — 20 cm

Q. If the lengths of the sides of a triangle are 3 cm, 4 cm, and 5 cm, what type of triangle is it? (2023)

A. Acute
B. Obtuse
C. Right
D. Equilateral

Solution

A triangle with sides 3 cm, 4 cm, and 5 cm satisfies the Pythagorean theorem (3² + 4² = 5²), thus it is a right triangle.

Correct Answer: C — Right

Q. If the lengths of the sides of a triangle are 7 cm, 24 cm, and 25 cm, is it a right triangle? (2023)

A. Yes
B. No
C. Cannot be determined
D. Only if angles are known

Solution

Using Pythagoras theorem, 7² + 24² = 49 + 576 = 625 = 25², so it is a right triangle.

Correct Answer: A — Yes

Q. If the lengths of two sides of a triangle are 8 cm and 15 cm, what is the maximum possible length of the third side? (2021)

A. 22 cm
B. 23 cm
C. 24 cm
D. 25 cm

Solution

The maximum length of the third side is less than the sum of the other two sides, so it can be 22 cm.

Correct Answer: A — 22 cm

Q. If the line 2x - 3y + 6 = 0 intersects the x-axis, what is the x-coordinate of the intersection point?

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

Solution

Set y = 0: 2x + 6 = 0; x = -3.

Correct Answer: A — -3

Q. If the line 4x + 3y = 12 intersects the y-axis, what is the point of intersection? (2022)

A. (0, 4)
B. (0, 3)
C. (0, 2)
D. (0, 1)

Solution

Setting x = 0 in the equation gives 3y = 12, thus y = 4. The point of intersection is (0, 4).

Correct Answer: B — (0, 3)

Q. If the line 4x - 3y + 12 = 0 is parallel to another line, what is the slope of the parallel line? (2022)

A. 4/3
B. 3/4
C. -4/3
D. -3/4

Solution

Rearranging gives y = (4/3)x + 4. The slope is -4/3, so a parallel line has the same slope.

Correct Answer: C — -4/3

Q. If the line y = mx + c passes through the point (1, 2), what is the value of c when m = 3? (2023)

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

Solution

Substituting (1, 2) gives 2 = 3(1) + c, so c = -1.

Correct Answer: A — -1

Q. If the line y = mx + c passes through the point (2, 3) and has a slope of 2, what is the value of c? (2023)

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

Solution

Using y = mx + c: 3 = 2(2) + c => c = -1.

Correct Answer: A — -1

Q. If the Lok Sabha has 543 members and 10% are from Scheduled Castes, how many members are from Scheduled Castes? (2018)

A. 50
B. 52
C. 54
D. 56

Solution

10% of 543 = 0.10 * 543 = 54.3, rounding down gives 54 members.

Correct Answer: A — 50

Q. If the Lok Sabha has 545 members and 20% of them are women, how many women members are there in the Lok Sabha?

A. 100
B. 110
C. 120
D. 130

Solution

Number of women members = 20% of 545 = 0.20 * 545 = 109. Therefore, approximately 110.

Correct Answer: B — 110

Q. If the mass of an object is 2 kg, what is its energy equivalent according to Einstein's equation E=mc^2? (2022)

A. 1.8 x 10^16 J
B. 1.8 x 10^14 J
C. 1.8 x 10^12 J
D. 1.8 x 10^10 J

Solution

E = mc^2 = 2 kg * (3 x 10^8 m/s)^2 = 1.8 x 10^16 J.

Correct Answer: A — 1.8 x 10^16 J

Q. If the mean of 10 numbers is 50, what is the mean of the first 5 numbers if their sum is 200?

A. 30
B. 40
C. 50
D. 60

Solution

Mean of 10 numbers = 50, so total sum = 500. Sum of last 5 numbers = 500 - 200 = 300. Mean of last 5 = 300 / 5 = 60.

Correct Answer: D — 60

Q. If the mean of 12 numbers is 25, what is the sum of these numbers?

A. 250
B. 300
C. 275
D. 225

Solution

The sum of the numbers is calculated as mean * number of items = 25 * 12 = 300.

Correct Answer: A — 250

Q. If the mean of a data set is 10 and the number of observations is 5, what is the sum of the observations?

A. 50
B. 40
C. 30
D. 20

Solution

Sum = Mean * Number of observations = 10 * 5 = 50.

Correct Answer: A — 50

Q. If the mean of a data set is 15 and the standard deviation is 5, what is the variance? (2022)

A. 10
B. 15
C. 20
D. 25

Solution

Variance is the square of the standard deviation. Therefore, variance = 5² = 25.

Correct Answer: D — 25

Q. If the mean of a data set is 20 and the standard deviation is 5, what is the variance?

A. 10
B. 15
C. 20
D. 25

Solution

Variance = (Standard Deviation)² = 5² = 25.

Correct Answer: D — 25

Q. If the mean of a data set is 20 and there are 10 values, what is the total sum of the values?

A. 200
B. 150
C. 100
D. 250

Solution

Total sum = Mean * Number of values = 20 * 10 = 200

Correct Answer: A — 200

Q. If the mean of a data set is 20 and there are 5 values, what is the total sum of the values? (2022)

A. 100
B. 80
C. 60
D. 40

Solution

Total sum = Mean * Number of values = 20 * 5 = 100

Correct Answer: A — 100

Q. If the mean of a data set is 30 and the standard deviation is 5, what is the variance? (2023)

A. 10
B. 15
C. 20
D. 25

Solution

Variance is the square of the standard deviation. Therefore, variance = 5² = 25.

Correct Answer: D — 25

Q. If the mean of a data set is 50 and the standard deviation is 10, what is the variance? (2023)

A. 50
B. 100
C. 150
D. 200

Solution

Variance is the square of the standard deviation. Therefore, variance = 10² = 100.

Correct Answer: B — 100

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