Major Competitive Exams

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Major Competitive Exams

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Major Competitive Exams MCQ & Objective Questions

Major Competitive Exams play a crucial role in shaping the academic and professional futures of students in India. These exams not only assess knowledge but also test problem-solving skills and time management. Practicing MCQs and objective questions is essential for scoring better, as they help in familiarizing students with the exam format and identifying important questions that frequently appear in tests.

What You Will Practise Here

Key concepts and theories related to major subjects
Important formulas and their applications
Definitions of critical terms and terminologies
Diagrams and illustrations to enhance understanding
Practice questions that mirror actual exam patterns
Strategies for solving objective questions efficiently
Time management techniques for competitive exams

Exam Relevance

The topics covered under Major Competitive Exams are integral to various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect to encounter a mix of conceptual and application-based questions that require a solid understanding of the subjects. Common question patterns include multiple-choice questions that test both knowledge and analytical skills, making it essential to be well-prepared with practice MCQs.

Common Mistakes Students Make

Rushing through questions without reading them carefully
Overlooking the negative marking scheme in MCQs
Confusing similar concepts or terms
Neglecting to review previous years’ question papers
Failing to manage time effectively during the exam

FAQs

Question: How can I improve my performance in Major Competitive Exams?
Answer: Regular practice of MCQs and understanding key concepts will significantly enhance your performance.

Question: What types of questions should I focus on for these exams?
Answer: Concentrate on important Major Competitive Exams questions that frequently appear in past papers and mock tests.

Question: Are there specific strategies for tackling objective questions?
Answer: Yes, practicing under timed conditions and reviewing mistakes can help develop effective strategies.

Start your journey towards success by solving practice MCQs today! Test your understanding and build confidence for your upcoming exams. Remember, consistent practice is the key to mastering Major Competitive Exams!

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Q. What is the output of a NOR gate when both inputs are false?

A. True
B. False
C. Both true
D. Both false

Solution

A NOR gate outputs true when both inputs are false.

Correct Answer: A — True

Q. What is the output of a NOR gate when both inputs are low?

A. 0
B. 1
C. Undefined
D. Depends on the circuit

Solution

A NOR gate outputs 1 only when both inputs are 0. Therefore, if both inputs are low (0), the output is 1.

Correct Answer: B — 1

Q. What is the output of a NOT gate when the input is 0?

A. 0
B. 1
C. Undefined
D. Depends on the circuit

Solution

A NOT gate inverts the input. Therefore, NOT 0 = 1.

Correct Answer: B — 1

Q. What is the output of a NOT gate when the input is true?

A. True
B. False
C. Both True and False
D. Undefined

Solution

A NOT gate outputs false when the input is true.

Correct Answer: B — False

Q. What is the output of an AND gate with inputs 0 and 1?

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

Solution

An AND gate outputs 1 only when both inputs are 1. Since one input is 0, the output is 0.

Correct Answer: A — 0

Q. What is the output of an AND gate with inputs A = 0 and B = 0?

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

Solution

An AND gate outputs 1 only when both inputs are high. Since both A and B are 0, the output is 0.

Correct Answer: A — 0

Q. What is the output of an AND gate with inputs A = 0 and B = 1?

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

Solution

An AND gate outputs 1 only when both inputs are high. Since A = 0, the output is 0.

Correct Answer: A — 0

Q. What is the output of an OR gate if one input is false and the other is true?

A. True
B. False
C. Both True
D. Both False

Solution

An OR gate outputs true if at least one input is true.

Correct Answer: A — True

Q. What is the output of an OR gate when both inputs are low?

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

Solution

An OR gate outputs 0 only when both inputs are low. Therefore, the output is 0.

Correct Answer: A — 0

Q. What is the output of an XOR gate when both inputs are the same?

A. True
B. False
C. Both True and False
D. Undefined

Solution

An XOR gate outputs false when both inputs are the same.

Correct Answer: B — False

Q. What is the output of the expression NOT (A AND B) when A = 0 and B = 1?

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

Solution

A AND B = 0 AND 1 = 0. Therefore, NOT (0) = 1.

Correct Answer: B — 1

Q. What is the output of the following expression: 2 + 3 * 4?

A. 14
B. 20
C. 12
D. 10

Solution

According to the order of operations, 3 * 4 is calculated first, giving 12, and then 2 is added, resulting in 14.

Correct Answer: C — 12

Q. What is the overall trend for Product A based on the table?

A. Increasing
B. Decreasing
C. Stable
D. Unpredictable

Solution

The overall trend for Product A is increasing, as sales have risen each quarter.

Correct Answer: A — Increasing

Q. What is the overall trend for Product B as per the table?

A. Increasing
B. Decreasing
C. Fluctuating
D. Stable

Solution

The overall trend for Product B is increasing, as sales have risen each quarter.

Correct Answer: A — Increasing

Q. What is the oxidation state of chlorine in NaClO3?

A. +1
B. +3
C. +5
D. +7

Solution

In NaClO3, chlorine has an oxidation state of +5.

Correct Answer: C — +5

Q. What is the oxidation state of chlorine in NaClO3? (2022) 2022

A. +1
B. +3
C. +5
D. +7

Solution

In NaClO3, the oxidation state of chlorine is +5. Sodium is +1 and each oxygen is -2, leading to the equation: +1 + x + 3(-2) = 0, solving gives x = +5.

Correct Answer: C — +5

Q. What is the oxidation state of chromium in K2Cr2O7?

A. +2
B. +3
C. +6
D. +7

Solution

In K2Cr2O7, the total oxidation state of the two potassium ions and seven oxygen ions is -12, leading to +6 for each chromium.

Correct Answer: C — +6

Q. What is the oxidation state of chromium in K2Cr2O7? (2021) 2021

A. +3
B. +6
C. +2
D. +5

Solution

In K2Cr2O7, the total charge from potassium (K) is +2, and oxygen (O) contributes -14. Let the oxidation state of Cr be x. The equation is 2x - 14 + 2 = 0, solving gives x = +6.

Correct Answer: B — +6

Q. What is the oxidation state of chromium in K2[Cr2O7]?

A. +2
B. +3
C. +6
D. +7

Solution

In K2[Cr2O7], the overall charge is 0. Each potassium (K) has a +1 charge, and each oxygen (O) has a -2 charge. Solving for chromium gives an oxidation state of +6.

Correct Answer: C — +6

Q. What is the oxidation state of chromium in the complex [Cr(NH3)4Cl2]Cl?

A. +2
B. +3
C. +4
D. +6

Solution

Let the oxidation state of Cr be x. The equation is x + 4(0) + 2(-1) = +1 (from Cl). Solving gives x = +3.

Correct Answer: B — +3

Q. What is the oxidation state of chromium in [Cr(NH3)4Cl2]+?

A. +2
B. +3
C. +4
D. +6

Solution

Let the oxidation state of Cr be x. The equation is x + 4(0) + 2(-1) = +1. Solving gives x = +3.

Correct Answer: B — +3

Q. What is the oxidation state of chromium in [Cr(NH3)4Cl2]Cl?

A. +2
B. +3
C. +4
D. +6

Solution

Let the oxidation state of Cr be x. The equation is x + 4(0) + 2(-1) = +1. Solving gives x = +3.

Correct Answer: B — +3

Q. What is the oxidation state of chromium in [Cr(NH3)6]Cl3?

A. +2
B. +3
C. +4
D. +6

Solution

The complex is neutral, and the three chloride ions contribute -3 charge. Therefore, the oxidation state of Cr must be +3.

Correct Answer: B — +3

Q. What is the oxidation state of hydrogen in H2O?

A. +1
B. 0
C. -1
D. +2

Solution

In water (H2O), the oxidation state of hydrogen is +1.

Correct Answer: A — +1

Q. What is the oxidation state of hydrogen in metal hydrides?

A. +1
B. 0
C. -1
D. +2

Solution

In metal hydrides, hydrogen has an oxidation state of -1.

Correct Answer: C — -1

Q. What is the oxidation state of hydrogen in most of its compounds?

A. -1
B. 0
C. +1
D. +2

Solution

In most of its compounds, hydrogen has an oxidation state of +1.

Correct Answer: C — +1

Q. What is the oxidation state of manganese in KMnO4?

A. +2
B. +4
C. +6
D. +7

Solution

In KMnO4, the oxidation state of manganese is +7.

Correct Answer: D — +7

Q. What is the oxidation state of nitrogen in NH4+?

A. -3
B. +1
C. +3
D. +5

Solution

In NH4+, nitrogen has an oxidation state of -3.

Correct Answer: A — -3

Q. What is the oxidation state of nitrogen in NH4+? (2020) 2020

A. -3
B. 0
C. +1
D. +3

Solution

In NH4+, nitrogen has an oxidation state of -3. Each hydrogen is +1, leading to the equation: x + 4(+1) = +1, solving gives x = -3.

Correct Answer: A — -3

Q. What is the oxidation state of nitrogen in NH4Cl? (2023)

A. -3
B. +3
C. +1
D. 0

Solution

In NH4Cl, the oxidation state of nitrogen is -3, as it is bonded to four hydrogens.

Correct Answer: A — -3

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