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.
Q. Which of the following lines is parallel to the line 3x - 4y + 5 = 0?
A.
6x - 8y + 10 = 0
B.
4x + 3y - 7 = 0
C.
3x + 4y - 5 = 0
D.
2x - 3y + 1 = 0
Show solution
Solution
Parallel lines have the same slope. The slope of the given line is 3/4, and the line 6x - 8y + 10 = 0 also has the same slope.
Correct Answer:
A
— 6x - 8y + 10 = 0
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Q. Which of the following longitudes is closest to the International Date Line?
A.
150°E
B.
180°
C.
150°W
D.
120°W
Show solution
Solution
The International Date Line is at 180°, so the closest longitude is 180°.
Correct Answer:
B
— 180°
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Q. Which of the following materials has the highest speed of sound?
A.
Air
B.
Water
C.
Steel
D.
Wood
Show solution
Solution
Sound travels fastest in solids; hence, the speed of sound in steel is higher than in air, water, or wood.
Correct Answer:
C
— Steel
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Q. Which of the following materials is the best conductor of sound?
A.
Air
B.
Water
C.
Steel
D.
Wood
Show solution
Solution
Sound travels fastest in solids, and steel is a solid material that conducts sound well.
Correct Answer:
C
— Steel
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Q. Which of the following materials would sound travel fastest through? (2019)
A.
Air
B.
Water
C.
Steel
D.
Wood
Show solution
Solution
Sound travels fastest through solids like steel due to closely packed molecules.
Correct Answer:
C
— Steel
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Q. Which of the following matrices is a diagonal matrix? (2023)
A.
[[1, 0], [0, 2]]
B.
[[1, 2], [3, 4]]
C.
[[0, 1], [1, 0]]
D.
[[1, 1], [1, 1]]
Show solution
Solution
A diagonal matrix is one where all off-diagonal elements are zero. The matrix [[1, 0], [0, 2]] is a diagonal matrix.
Correct Answer:
A
— [[1, 0], [0, 2]]
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Q. Which of the following matrices is a zero matrix? (2022)
A.
[[0, 0], [0, 0]]
B.
[[1, 0], [0, 1]]
C.
[[1, 2], [3, 4]]
D.
[[0, 1], [1, 0]]
Show solution
Solution
A zero matrix is one where all elements are zero. The matrix [[0, 0], [0, 0]] meets this criterion.
Correct Answer:
A
— [[0, 0], [0, 0]]
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Q. Which of the following matrices is an identity matrix? (2023)
A.
[[1, 0], [0, 1]]
B.
[[0, 1], [1, 0]]
C.
[[1, 1], [1, 1]]
D.
[[0, 0], [0, 0]]
Show solution
Solution
An identity matrix has 1s on the diagonal and 0s elsewhere. The matrix [[1, 0], [0, 1]] fits this definition.
Correct Answer:
A
— [[1, 0], [0, 1]]
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Q. Which of the following matrices is an orthogonal matrix? (2021)
A.
A matrix whose transpose is equal to its inverse
B.
A matrix with all elements equal
C.
A matrix with only one row
D.
A matrix with all diagonal elements equal
Show solution
Solution
An orthogonal matrix is defined as a matrix whose transpose is equal to its inverse.
Correct Answer:
A
— A matrix whose transpose is equal to its inverse
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Q. Which of the following matrices is not invertible? (2019)
A.
[[1, 2], [3, 4]]
B.
[[0, 1], [0, 0]]
C.
[[5, 6], [7, 8]]
D.
[[9, 10], [11, 12]]
Show solution
Solution
A matrix is not invertible if its determinant is zero. The matrix [[0, 1], [0, 0]] has a determinant of 0.
Correct Answer:
B
— [[0, 1], [0, 0]]
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Q. Which of the following matrices is symmetric? (2023)
A.
A = [[1, 2], [3, 4]]
B.
B = [[1, 2], [2, 1]]
C.
C = [[1, 0], [0, 1]]
D.
D = [[1, 2, 3], [4, 5, 6]]
Show solution
Solution
A symmetric matrix is one that is equal to its transpose. Matrix B is symmetric because B = B^T.
Correct Answer:
B
— B = [[1, 2], [2, 1]]
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Q. Which of the following metals is known for its resistance to corrosion? (2019)
A.
Iron
B.
Copper
C.
Aluminum
D.
Gold
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Solution
Gold is highly resistant to corrosion, which is why it is often used in jewelry and electronics.
Correct Answer:
D
— Gold
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Q. Which of the following metals is known to be the least reactive?
A.
Gold
B.
Sodium
C.
Potassium
D.
Calcium
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Solution
Gold is known to be the least reactive metal, making it resistant to corrosion and oxidation.
Correct Answer:
A
— Gold
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Q. Which of the following metals is known to be the most malleable?
A.
Iron
B.
Gold
C.
Lead
D.
Copper
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Solution
Gold is known to be the most malleable metal, capable of being drawn into extremely thin sheets.
Correct Answer:
B
— Gold
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Q. Which of the following metals is known to react vigorously with water? (2022)
A.
Iron
B.
Sodium
C.
Copper
D.
Lead
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Solution
Sodium reacts vigorously with water to produce sodium hydroxide and hydrogen gas.
Correct Answer:
B
— Sodium
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Q. Which of the following metals is known to react with water at room temperature? (2019)
A.
Iron
B.
Sodium
C.
Copper
D.
Gold
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Solution
Sodium reacts vigorously with water at room temperature, producing sodium hydroxide and hydrogen gas.
Correct Answer:
B
— Sodium
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Q. Which of the following metals is liquid at room temperature? (2023)
A.
Mercury
B.
Lead
C.
Tin
D.
Bismuth
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Solution
Mercury is the only metal that is liquid at room temperature.
Correct Answer:
A
— Mercury
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Q. Which of the following metals is most reactive? (2019)
A.
Gold
B.
Silver
C.
Sodium
D.
Copper
Show solution
Solution
Sodium is a highly reactive metal, especially with water, compared to the other metals listed.
Correct Answer:
C
— Sodium
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Q. Which of the following metals is the best conductor of electricity?
A.
Copper
B.
Aluminum
C.
Gold
D.
Silver
Show solution
Solution
Silver is the best conductor of electricity among metals due to its high electron mobility.
Correct Answer:
D
— Silver
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Q. Which of the following metals is used in making aircraft due to its lightweight? (2020)
A.
Lead
B.
Aluminum
C.
Iron
D.
Copper
Show solution
Solution
Aluminum is widely used in aircraft manufacturing because of its lightweight and strength.
Correct Answer:
B
— Aluminum
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Q. Which of the following metals is used in making alloys?
A.
Mercury
B.
Tin
C.
Bismuth
D.
Lead
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Solution
Tin is commonly used in making alloys, such as bronze when combined with copper.
Correct Answer:
B
— Tin
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Q. Which of the following metals is used in making electrical wires?
A.
Zinc
B.
Copper
C.
Aluminum
D.
Iron
Show solution
Solution
Copper is widely used in electrical wiring due to its excellent conductivity.
Correct Answer:
B
— Copper
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Q. Which of the following metals reacts vigorously with water?
A.
Copper
B.
Sodium
C.
Iron
D.
Gold
Show solution
Solution
Sodium reacts vigorously with water to produce sodium hydroxide and hydrogen gas.
Correct Answer:
B
— Sodium
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Q. Which of the following mountain ranges is located in India?
A.
Andes
B.
Himalayas
C.
Rockies
D.
Alps
Show solution
Solution
The Himalayas are the major mountain range located in India.
Correct Answer:
B
— Himalayas
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Q. Which of the following non-metals is a gas at room temperature?
A.
Phosphorus
B.
Sulfur
C.
Chlorine
D.
Carbon
Show solution
Solution
Chlorine is a non-metal that exists as a gas at room temperature.
Correct Answer:
C
— Chlorine
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Q. Which of the following non-metals is a good insulator? (2023)
A.
Graphite
B.
Sulfur
C.
Phosphorus
D.
Diamond
Show solution
Solution
Diamond is a non-metal that is a good insulator due to its strong covalent bonds.
Correct Answer:
D
— Diamond
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Q. Which of the following non-metals is a key component of DNA?
A.
Oxygen
B.
Nitrogen
C.
Carbon
D.
Hydrogen
Show solution
Solution
Nitrogen is a key component of DNA, forming part of the nucleotides that make up the genetic code.
Correct Answer:
B
— Nitrogen
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Q. Which of the following non-metals is used in fertilizers?
A.
Nitrogen
B.
Oxygen
C.
Helium
D.
Argon
Show solution
Solution
Nitrogen is a key component in fertilizers, promoting plant growth.
Correct Answer:
A
— Nitrogen
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Q. Which of the following numbers is a perfect square?
Show solution
Solution
25 is a perfect square (5^2).
Correct Answer:
C
— 25
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Q. Which of the following points lies on the parabola y = x^2 - 4?
A.
(2, 0)
B.
(0, -4)
C.
(1, -3)
D.
(3, 5)
Show solution
Solution
Substituting x = 1 into the equation gives y = 1^2 - 4 = -3, so the point (1, -3) lies on the parabola.
Correct Answer:
C
— (1, -3)
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