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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. A set of numbers has a mean of 15. If one number is removed, the new mean becomes 12. What was the removed number? (2022)

A. 9
B. 12
C. 15
D. 18

Solution

Let the number of items be n. Then, 15n - x = 12(n - 1). Solving gives x = 18.

Correct Answer: D — 18

Q. A set of numbers has a mean of 20. If one number is removed, the mean becomes 18. What was the number removed? (2022)

A. 22
B. 24
C. 20
D. 18

Solution

Let the number of elements be n. Then, 20n - x = 18(n - 1). Solving gives x = 22.

Correct Answer: A — 22

Q. A set of numbers has a variance of 36. What is the standard deviation? (2019)

A. 6
B. 12
C. 18
D. 24

Solution

Standard deviation is the square root of variance. Therefore, SD = √36 = 6.

Correct Answer: A — 6

Q. A set of numbers has the following frequencies: 10 (1), 20 (2), 30 (3), 40 (4). What is the mode of this set? (2021)

A. 10
B. 20
C. 30
D. 40

Solution

The number 40 appears most frequently (4 times), so the mode is 40.

Correct Answer: D — 40

Q. A set of numbers is given as follows: 1, 1, 2, 3, 3, 4, 4, 4, 5. What is the mode?

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

Solution

The number 4 appears 3 times, which is more than any other number, making it the mode.

Correct Answer: D — 4

Q. A shopkeeper sells a shirt for $300 after giving a discount of 20%. What was the original price of the shirt? (2020)

A. $360
B. $400
C. $320
D. $300

Solution

Let the original price be x. Then, x - 0.20x = 300. Therefore, 0.80x = 300, x = 300 / 0.80 = $400.

Correct Answer: B — $400

Q. A shopkeeper sells a shirt for Rs. 800 after giving a discount of 20%. What was the original price of the shirt? (2020)

A. Rs. 1000
B. Rs. 900
C. Rs. 800
D. Rs. 750

Solution

Let the original price be x. Then, x - 0.20x = 800 => 0.80x = 800 => x = 1000.

Correct Answer: A — Rs. 1000

Q. A shopkeeper sells a shirt for Rs. 800 after giving a discount of 20%. What was the marked price of the shirt? (2020)

A. Rs. 1000
B. Rs. 900
C. Rs. 800
D. Rs. 750

Solution

Let marked price = x. Then, 0.8x = 800 => x = 800/0.8 = 1000.

Correct Answer: A — Rs. 1000

Q. A shopkeeper sells an article for Rs. 800, making a profit of 20%. What was the cost price of the article? (2020)

A. Rs. 600
B. Rs. 640
C. Rs. 500
D. Rs. 700

Solution

Let CP = x. Then, 800 = x + 0.20x = 1.20x. Therefore, x = 800 / 1.20 = 666.67.

Correct Answer: A — Rs. 600

Q. A snack contains 150 calories, with 10% from protein, 50% from carbohydrates, and 40% from fats. How many calories are from fats?

A. 40 calories
B. 50 calories
C. 60 calories
D. 70 calories

Solution

40% of 150 calories = 0.40 * 150 = 60 calories from fats.

Correct Answer: C — 60 calories

Q. A snack contains 150 calories, with 60% from carbohydrates, 20% from protein, and 20% from fat. How many calories come from fat?

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

Solution

20% of 150 calories = 0.20 * 150 = 30 calories.

Correct Answer: C — 40 calories

Q. A snack contains 200 calories, with 10 grams of protein, 20 grams of carbohydrates, and 5 grams of fat. What percentage of the total calories comes from protein? (2019)

A. 10%
B. 20%
C. 25%
D. 30%

Solution

Calories from protein = 10g * 4 = 40 calories. Percentage = (40/200) * 100 = 20%.

Correct Answer: B — 20%

Q. A snack contains 250 calories, with 40% from carbohydrates, 30% from fats, and 30% from proteins. How many calories come from carbohydrates? (2022)

A. 80 calories
B. 90 calories
C. 100 calories
D. 110 calories

Solution

40% of 250 = 0.40 * 250 = 100 calories.

Correct Answer: C — 100 calories

Q. A soil sample contains 40% sand, 30% silt, and 30% clay. What is the percentage of silt in the soil?

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

Solution

The percentage of silt in the soil is given as 30%.

Correct Answer: A — 30%

Q. A soil sample contains 40% sand, 30% silt, and 30% clay. What is the percentage of silt in the sample? (2023)

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

Solution

The percentage of silt in the sample is given as 30%.

Correct Answer: A — 30%

Q. A soil sample contains 40% sand, 30% silt, and 30% clay. What is the percentage of clay in the sample? (2022)

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

Solution

The percentage of clay is given as 30%.

Correct Answer: A — 30%

Q. A soil sample has a moisture content of 20%. If the dry weight of the soil is 80 kg, what is the weight of the water in the sample?

A. 20 kg
B. 16 kg
C. 24 kg
D. 32 kg

Solution

Weight of water = Moisture content × Dry weight = 0.20 × 80 kg = 16 kg.

Correct Answer: C — 24 kg

Q. A soldier can run 100 meters in 12 seconds. What is his speed in km/h? (2019)

A. 18 km/h
B. 20 km/h
C. 25 km/h
D. 30 km/h

Solution

Speed = Distance / Time = 100 m / 12 s = 8.33 m/s. Converting to km/h: 8.33 * 18/5 = 30 km/h.

Correct Answer: B — 20 km/h

Q. A soldier runs 12 km in 1 hour and 15 minutes. What is his speed in km/h? (2023)

A. 8 km/h
B. 9 km/h
C. 10 km/h
D. 11 km/h

Solution

Time = 1 hour + 15 minutes = 1.25 hours. Speed = Distance / Time = 12 km / 1.25 h = 9.6 km/h.

Correct Answer: B — 9 km/h

Q. A soldier runs 12 km in 1 hour and 30 minutes. What is his average speed in km/h? (2023)

A. 7.5 km/h
B. 8 km/h
C. 8.5 km/h
D. 9 km/h

Solution

Average Speed = Distance / Time = 12 km / (1.5 h) = 8 km/h

Correct Answer: A — 7.5 km/h

Q. A soldier runs 5 km in 30 minutes. What is his speed in km/h? (2019)

A. 8 km/h
B. 10 km/h
C. 12 km/h
D. 15 km/h

Solution

Speed = Distance / Time = 5 km / (30/60) h = 10 km/h

Correct Answer: B — 10 km/h

Q. A soldier runs a distance of 400 meters in 50 seconds. What is his average speed in m/s? (2022)

A. 6 m/s
B. 7 m/s
C. 8 m/s
D. 9 m/s

Solution

Average speed = Distance / Time = 400 m / 50 s = 8 m/s.

Correct Answer: A — 6 m/s

Q. A sound wave has a frequency of 440 Hz. What is its period?

A. 0.00227 s
B. 0.00455 s
C. 0.01 s
D. 0.1 s

Solution

The period (T) is the inverse of frequency (f), T = 1/f = 1/440 ≈ 0.00227 s.

Correct Answer: B — 0.00455 s

Q. A sports event awards medals to the top 3 finishers. If the first place receives a gold medal, the second place receives a silver medal, and the third place receives a bronze medal, what is the ratio of gold to silver to bronze medals awarded? (2021)

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

Solution

The ratio of gold to silver to bronze medals is 1:1:1 since each position gets one medal.

Correct Answer: A — 1:1:1

Q. A sports team has a win-loss record of 8 wins and 2 losses. What is the winning percentage of the team? (2022)

A. 80%
B. 75%
C. 70%
D. 85%

Solution

Winning percentage = (wins / total games) × 100 = (8 / (8 + 2)) × 100 = 80%.

Correct Answer: A — 80%

Q. A sports team wins 70% of its matches. If they played 50 matches, how many matches did they win? (2023)

A. 30
B. 35
C. 40
D. 45

Solution

Matches won = 70% of 50 = 0.7 * 50 = 35 matches.

Correct Answer: B — 35

Q. A sports team won 75% of their games. If they played 40 games, how many games did they win? (2023)

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

Solution

Games won = 75% of 40 = 0.75 × 40 = 30 games.

Correct Answer: A — 30

Q. A sports team won 75% of their matches. If they played 40 matches, how many matches did they win? (2022)

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

Solution

Matches won = 75% of 40 = 0.75 × 40 = 30 matches.

Correct Answer: A — 30

Q. A spring has a spring constant of 200 N/m. How much force is required to stretch the spring by 0.1 m?

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

Solution

Using Hooke's law, F = kx = 200 N/m * 0.1 m = 20 N.

Correct Answer: A — 5 N

Q. A spring has a spring constant of 200 N/m. How much force is required to stretch the spring by 0.5 m?

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

Solution

Using Hooke's law, F = kx = 200 N/m * 0.5 m = 100 N.

Correct Answer: B — 100 N

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