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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. The mean of 5, 15, 25, and x is 20. Find the value of x. (2023)

A. 20
B. 25
C. 30
D. 35

Solution

Mean = (5 + 15 + 25 + x) / 4 = 20. Solving gives x = 30.

Correct Answer: C — 30

Q. The mean of 5, 15, and x is 10. What is the value of x? (2020)

A. 5
B. 10
C. 15
D. 20

Solution

Mean = (5 + 15 + x) / 3 = 10. Therefore, 20 + x = 30, so x = 10.

Correct Answer: D — 20

Q. The mean of 6, 8, 10, and x is 9. What is the value of x? (2022)

A. 6
B. 8
C. 10
D. 12

Solution

Mean = (6 + 8 + 10 + x) / 4 = 9. Therefore, 24 + x = 36, so x = 12.

Correct Answer: D — 12

Q. The mean of 7, 9, 11, 13, and x is 10. Find the value of x.

A. 5
B. 7
C. 9
D. 11

Solution

Mean = (7 + 9 + 11 + 13 + x) / 5 = 10. Solving gives x = 5.

Correct Answer: A — 5

Q. The mean of 7, 9, 11, 13, and x is 10. What is the value of x?

A. 5
B. 7
C. 9
D. 11

Solution

Mean = (7 + 9 + 11 + 13 + x) / 5 = 10.\n\n40 + x = 50\n\nx = 50 - 40 = 10.

Correct Answer: A — 5

Q. The mean of 7, 9, 11, and 13 is what? (2019)

A. 9
B. 10
C. 11
D. 12

Solution

Mean = (7 + 9 + 11 + 13) / 4 = 40 / 4 = 10.

Correct Answer: B — 10

Q. The mean of 8, 12, 16, and 20 is what? (2019)

A. 14
B. 15
C. 16
D. 17

Solution

Mean = (8 + 12 + 16 + 20) / 4 = 56 / 4 = 14.

Correct Answer: B — 15

Q. The mean of 8, 12, 16, and x is 14. Find the value of x.

A. 10
B. 12
C. 14
D. 16

Solution

Mean = (8 + 12 + 16 + x) / 4 = 14. Therefore, 36 + x = 56, so x = 20.

Correct Answer: A — 10

Q. The mean of a data set is 10 and the variance is 4. What is the standard deviation? (2019)

A. 2
B. 4
C. 8
D. 10

Solution

Standard deviation is the square root of variance. Therefore, SD = √4 = 2.

Correct Answer: A — 2

Q. The mean of a set of numbers is 15. If one number is removed, the mean becomes 12. What was the removed number?

A. 18
B. 20
C. 24
D. 30

Solution

Let the total number of items be n. Then, 15n - x = 12(n - 1). Solving gives x = 24.

Correct Answer: C — 24

Q. The mean of a set of numbers is 25. If one number is increased by 5, how does the mean change?

A. Increases by 1
B. Increases by 0.5
C. Remains the same
D. Decreases by 1

Solution

Increasing one number by 5 increases the total sum by 5. If there are n numbers, the mean increases by 5/n.

Correct Answer: A — Increases by 1

Q. The mean of a set of numbers is 30. If one more number, 50, is added to the set, what will be the new mean if the original set had 10 numbers?

A. 32
B. 33
C. 34
D. 35

Solution

The original sum of the numbers is 30 * 10 = 300. Adding 50 gives a new sum of 300 + 50 = 350. The new mean is 350 / 11 = 31.82, which rounds to 32.

Correct Answer: B — 33

Q. The mean of five consecutive integers is 12. What is the smallest of these integers?

A. 10
B. 11
C. 12
D. 13

Solution

Let the integers be x, x+1, x+2, x+3, x+4. Mean = (5x + 10) / 5 = 12. Solving gives x = 10.

Correct Answer: A — 10

Q. The mean of five numbers is 20. If one number is removed, the mean of the remaining numbers becomes 18. What is the number that was removed?

A. 10
B. 12
C. 14
D. 16

Solution

Let the sum of the five numbers be S. Then, S/5 = 20, so S = 100. Let the removed number be x. The new sum is S - x, and the new mean is (S - x)/4 = 18. Therefore, 100 - x = 72, which gives x = 28.

Correct Answer: C — 14

Q. The mean of the first four prime numbers is what? (2019)

A. 2
B. 3
C. 5
D. 7

Solution

The first four prime numbers are 2, 3, 5, and 7. Mean = (2 + 3 + 5 + 7) / 4 = 17 / 4 = 4.25.

Correct Answer: C — 5

Q. The mean of the numbers 4, 8, 10, 12, and x is 10. What is the value of x? (2021)

A. 10
B. 12
C. 14
D. 16

Solution

Mean = (4 + 8 + 10 + 12 + x) / 5 = 10. Solving gives x = 14.

Correct Answer: C — 14

Q. The mean of the numbers 4, 8, 12, and x is 10. What is the value of x?

A. 10
B. 12
C. 16
D. 20

Solution

Mean = (4 + 8 + 12 + x) / 4 = 10. Therefore, 4 + 8 + 12 + x = 40. So, x = 40 - 24 = 16.

Correct Answer: C — 16

Q. The mean of three consecutive integers is 20. What are the integers?

A. 19, 20, 21
B. 18, 19, 20
C. 20, 21, 22
D. 21, 22, 23

Solution

Let the integers be x, x+1, x+2. Mean = (x + (x+1) + (x+2)) / 3 = 20. Thus, 3x + 3 = 60, so x = 19.

Correct Answer: A — 19, 20, 21

Q. The mean of three numbers is 12. If one of the numbers is 8, what is the mean of the other two numbers? (2021)

A. 10
B. 12
C. 14
D. 16

Solution

Total of three numbers = 3 * 12 = 36. Sum of the other two numbers = 36 - 8 = 28. Mean of the other two = 28 / 2 = 14.

Correct Answer: B — 12

Q. The mean of three numbers is 15. If one number is increased by 5, what will be the new mean?

A. 15
B. 16
C. 17
D. 18

Solution

New mean = (15*3 + 5) / 3 = 20/3 = 16.67.

Correct Answer: B — 16

Q. The mean of three numbers is 15. If one of the numbers is 10, what is the mean of the other two numbers? (2020)

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

Solution

Let the other two numbers be a and b. Then, (10 + a + b) / 3 = 15. Solving gives (a + b) = 35, so Mean of a and b = 35 / 2 = 17.5.

Correct Answer: B — 20

Q. The mean of three numbers is 30. If one of the numbers is 20, what is the mean of the other two numbers? (2023)

A. 25
B. 30
C. 35
D. 40

Solution

Let the three numbers be a, b, c. Then, (a + b + 20) / 3 = 30. Thus, a + b = 90, and the mean of a and b = 90 / 2 = 45.

Correct Answer: A — 25

Q. The median of the data set 3, 7, 8, 12, x is 8. What is the value of x? (2023)

A. 6
B. 8
C. 10
D. 12

Solution

For the median to be 8, x must be less than or equal to 8. The only value that satisfies this is x = 6.

Correct Answer: A — 6

Q. The median of the data set 3, 7, 9, 12, 15 is: (2022)

A. 7
B. 9
C. 12
D. 10

Solution

Median = 9 (middle value of the ordered data set)

Correct Answer: B — 9

Q. The median of the following data set: 3, 7, 9, 15, 20 is?

A. 7
B. 9
C. 15
D. 20

Solution

Arranging the data: 3, 7, 9, 15, 20. Median = 9 (middle value).

Correct Answer: B — 9

Q. The MGNREGA scheme provides how many days of guaranteed wage employment in a financial year? (2005)

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

Solution

The Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA) provides 100 days of guaranteed wage employment in a financial year.

Correct Answer: B — 100 days

Q. The minimum value of the function f(x) = x^2 - 4x + 6 occurs at x = ? (2020)

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

Solution

The vertex of the parabola occurs at x = -b/(2a) = 4/2 = 2. The minimum value is f(2) = 2^2 - 4*2 + 6 = 2.

Correct Answer: B — 2

Q. The Mohorovičić discontinuity separates which two layers of the Earth? (2023)

A. Crust and Mantle
B. Mantle and Outer Core
C. Outer Core and Inner Core
D. Crust and Outer Core

Solution

The Mohorovičić discontinuity, or Moho, separates the Earth's crust from the underlying mantle.

Correct Answer: A — Crust and Mantle

Q. The National Health Mission (NHM) was launched to improve healthcare delivery in which year? (2010)

A. 2005
B. 2010
C. 2015
D. 2020

Solution

The National Health Mission (NHM) was launched in 2010 to improve healthcare delivery across the country.

Correct Answer: B — 2010

Q. The National Rural Livelihood Mission (NRLM) focuses on which of the following? (2011)

A. Providing housing for the urban poor
B. Promoting self-employment and organization of rural poor into self-help groups
C. Enhancing agricultural productivity
D. Providing health insurance to rural families

Solution

The National Rural Livelihood Mission focuses on promoting self-employment and organizing rural poor into self-help groups.

Correct Answer: B — Promoting self-employment and organization of rural poor into self-help groups

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