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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 result of mixing equal volumes of 0.1 M HCl and 0.1 M NaOH?

A. pH < 7
B. pH = 7
C. pH > 7
D. Cannot be determined

Solution

Mixing equal volumes of 0.1 M HCl and 0.1 M NaOH results in a neutral solution with pH = 7.

Correct Answer: B — pH = 7

Q. What is the result of multiplying 2.5 by 3.456, considering significant figures?

A. 8.64
B. 8.6
C. 8.65
D. 8.7

Solution

2.5 has 2 significant figures and 3.456 has 4 significant figures. The result should be rounded to 2 significant figures, giving 8.6.

Correct Answer: B — 8.6

Q. What is the role of antioxidants in nutrition? (2022)

A. Energy production
B. Cell protection
C. Muscle growth
D. Hormone regulation

Solution

Antioxidants play a role in cell protection by neutralizing free radicals that can cause cellular damage.

Correct Answer: B — Cell protection

Q. What is the role of auxins in plant growth?

A. Promote flowering
B. Stimulate root growth
C. Inhibit growth
D. Promote cell elongation

Solution

Auxins are plant hormones that promote cell elongation, which is crucial for growth and development in plants.

Correct Answer: D — Promote cell elongation

Q. What is the role of enzymes in biological reactions? (2023)

A. Increase temperature
B. Decrease activation energy
C. Change the pH
D. Provide energy

Solution

Enzymes act as catalysts that lower the activation energy required for biochemical reactions, thus speeding them up.

Correct Answer: B — Decrease activation energy

Q. What is the role of ribosomes in a cell?

A. Energy production
B. Protein synthesis
C. DNA replication
D. Cell division

Solution

Ribosomes are the sites of protein synthesis, translating mRNA into polypeptide chains.

Correct Answer: B — Protein synthesis

Q. What is the role of the circulatory system? (2019)

A. To break down food
B. To transport nutrients and oxygen
C. To produce hormones
D. To protect against diseases

Solution

The circulatory system's role is to transport nutrients, oxygen, and hormones to cells and remove waste products.

Correct Answer: B — To transport nutrients and oxygen

Q. What is the role of the endoplasmic reticulum?

A. Energy production
B. Synthesis of lipids and proteins
C. Storage of genetic information
D. Cell division

Solution

The endoplasmic reticulum is involved in the synthesis of lipids and proteins.

Correct Answer: B — Synthesis of lipids and proteins

Q. What is the role of the Golgi apparatus in the cell?

A. Energy production
B. Modification and packaging of proteins
C. Cell division
D. Photosynthesis

Solution

The Golgi apparatus modifies, sorts, and packages proteins for secretion or use within the cell.

Correct Answer: B — Modification and packaging of proteins

Q. What is the role of the respiratory system?

A. To break down food
B. To exchange gases
C. To circulate blood
D. To protect against pathogens

Solution

The respiratory system is responsible for the exchange of gases, primarily oxygen and carbon dioxide, between the body and the environment.

Correct Answer: B — To exchange gases

Q. What is the role of xylem in plants?

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

Solution

Xylem is responsible for the transport of water and dissolved minerals from the roots to the rest of the plant.

Correct Answer: B — Transport of water

Q. What is the scalar product of A = 1i + 2j + 3k and B = 4i + 5j + 6k?

A. 32
B. 34
C. 36
D. 30

Solution

A · B = (1)(4) + (2)(5) + (3)(6) = 4 + 10 + 18 = 32.

Correct Answer: A — 32

Q. What is the scalar product of the vectors A = 1i + 2j + 3k and B = 4i + 5j + 6k?

A. 32
B. 34
C. 36
D. 30

Solution

A · B = (1)(4) + (2)(5) + (3)(6) = 4 + 10 + 18 = 32.

Correct Answer: A — 32

Q. What is the scalar projection of vector H = 6i + 8j onto vector I = 3i + 4j?

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

Solution

Scalar projection = (H · I) / |I| = (6*3 + 8*4) / √(3^2 + 4^2) = (18 + 32) / 5 = 50 / 5 = 10.

Correct Answer: C — 10

Q. What is the scalar triple product of vectors A = i + j + k, B = 2i + 3j + k, and C = 3i + j + 2k?

A. 1
B. 2
C. 3
D. 0

Solution

Scalar triple product = A · (B × C) = |i  j  k| |1  1  1| |2  3  1| |3  1  2| = 0.

Correct Answer: D — 0

Q. What is the second derivative of f(x) = 2x^4 - 3x^3 + x?

A. 24x^2 - 18x + 1
B. 24x^2 - 9
C. 12x^2 - 9
D. 8x^3 - 9

Solution

First derivative f'(x) = 8x^3 - 9x^2 + 1. Second derivative f''(x) = 24x^2 - 18x.

Correct Answer: A — 24x^2 - 18x + 1

Q. What is the second derivative of f(x) = 2x^4 - 4x^3 + 3?

A. 24x^2 - 24x
B. 12x^2 - 12
C. 24x^3 - 12x^2
D. 8x^2 - 12

Solution

First derivative f'(x) = 8x^3 - 12x^2. Second derivative f''(x) = 24x^2 - 24x.

Correct Answer: A — 24x^2 - 24x

Q. What is the second derivative of the function f(x) = 2x^4 - 4x^3 + 3?

A. 24x^2 - 24x
B. 24x^2 - 12
C. 12x^2 - 12
D. 8x^2 - 12

Solution

First derivative f'(x) = 8x^3 - 12x^2. Second derivative f''(x) = 24x^2 - 24x.

Correct Answer: A — 24x^2 - 24x

Q. What is the shape of an s orbital? (2023)

A. Spherical
B. Dumbbell
C. Double dumbbell
D. Linear

Solution

The s orbital has a spherical shape.

Correct Answer: A — Spherical

Q. What is the significance of August 15 in India?

A. Constitution Day
B. Independence Day
C. Republic Day
D. Gandhi Jayanti

Solution

August 15 is celebrated as Independence Day in India.

Correct Answer: B — Independence Day

Q. What is the slope of the line perpendicular to the line 4x - 5y + 10 = 0? (2022)

A. 5/4
B. -4/5
C. 4/5
D. -5/4

Solution

The slope of the line is 4/5, so the slope of the perpendicular line is -5/4.

Correct Answer: B — -4/5

Q. What is the slope of the line perpendicular to the line 4x - 5y = 10? (2022)

A. 5/4
B. -4/5
C. 4/5
D. -5/4

Solution

The slope of the line is 4/5, so the slope of the perpendicular line is -5/4.

Correct Answer: B — -4/5

Q. What is the slope of the line represented by the equation 4x - 2y + 8 = 0? (2021)

A. 2
B. 4
C. -2
D. -4

Solution

Rearranging gives y = 2x + 4, so slope = 2.

Correct Answer: C — -2

Q. What is the slope of the line represented by the equation y = 2x + 3?

A. 1
B. 2
C. 3
D. 0

Solution

The slope of the line in the equation y = mx + b is m, which is 2.

Correct Answer: B — 2

Q. What is the slope of the line represented by the equation y = 3x + 2? (2021)

A. 3
B. 2
C. 1
D. 0

Solution

In the equation y = mx + b, m is the slope. Here, m = 3.

Correct Answer: A — 3

Q. What is the slope of the line represented by the equation y = 3x + 4? (2022)

A. 3
B. 4
C. 1/3
D. 0

Solution

The slope of the line in the equation y = mx + b is m. Here, m = 3.

Correct Answer: A — 3

Q. What is the slope of the tangent line to the curve y = x^2 + 2x at x = 1?

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

Solution

The derivative y' = 2x + 2. At x = 1, y' = 2(1) + 2 = 4.

Correct Answer: A — 3

Q. What is the slope of the tangent line to the curve y = x^2 at the point (1,1)? (2023)

A. 1
B. 2
C. 0
D. 3

Solution

The derivative y' = 2x; At x = 1, slope = 2(1) = 2.

Correct Answer: B — 2

Q. What is the slope of the tangent line to the curve y = x^2 at the point (2, 4)?

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

Solution

The derivative y' = 2x. At x = 2, the slope is y'(2) = 2(2) = 4.

Correct Answer: A — 2

Q. What is the slope of the tangent line to the curve y = x^2 at the point (3, 9)? (2020)

A. 3
B. 6
C. 9
D. 12

Solution

The derivative y' = 2x. At x = 3, y' = 2(3) = 6.

Correct Answer: B — 6

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