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 major product of the reaction between 1-bromobutane and sodium ethoxide in ethanol?

A. 1-ethoxybutane
B. 2-ethoxybutane
C. butane
D. no reaction

Solution

The reaction is an example of an SN2 reaction, where sodium ethoxide acts as a nucleophile, leading to the formation of 1-ethoxybutane.

Correct Answer: B — 2-ethoxybutane

Q. What is the major product of the reaction between 1-bromobutane and sodium hydroxide in ethanol?

A. 1-butanol
B. 2-butanol
C. butyl bromide
D. butyl ether

Solution

The reaction leads to the formation of 1-butanol through an SN2 mechanism.

Correct Answer: B — 2-butanol

Q. What is the major product of the reaction between chlorobenzene and sodium hydroxide at high temperature?

A. Phenol
B. Benzene
C. Chlorobenzene
D. Sodium phenoxide

Solution

The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic substitution.

Correct Answer: A — Phenol

Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide in ethanol?

A. 1-butene
B. 2-butene
C. butane
D. no reaction

Solution

The reaction proceeds via an elimination mechanism (E2) leading to the formation of 2-butene as the major product.

Correct Answer: B — 2-butene

Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide?

A. Butane
B. Ethyl butyl ether
C. 1-butene
D. 2-butene

Solution

The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.

Correct Answer: B — Ethyl butyl ether

Q. What is the major product of the reaction of 1-bromobutane with sodium hydroxide in ethanol? (2019)

A. Butanol
B. Butene
C. Butyl bromide
D. Sodium bromide

Solution

The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the major product.

Correct Answer: B — Butene

Q. What is the major product of the reaction of 1-butene with HBr?

A. 1-bromobutane
B. 2-bromobutane
C. Butane
D. Bromobenzene

Solution

The major product of the reaction of 1-butene with HBr is 2-bromobutane due to Markovnikov's rule.

Correct Answer: B — 2-bromobutane

Q. What is the major product of the reaction of 2-butyne with H2 in the presence of a catalyst?

A. 1-butyne
B. butane
C. 2-butyne
D. 3-butyne

Solution

The major product of hydrogenation of 2-butyne is butane.

Correct Answer: B — butane

Q. What is the major product of the reaction of propene with HBr?

A. 1-Bromopropane
B. 2-Bromopropane
C. Propyl bromide
D. Bromopropene

Solution

The major product of the reaction of propene with HBr is 2-bromopropane due to Markovnikov's rule.

Correct Answer: B — 2-Bromopropane

Q. What is the major product when 1-bromobutane reacts with sodium ethoxide in ethanol?

A. 1-ethoxybutane
B. 2-ethoxybutane
C. butane
D. butyl ethyl ether

Solution

The reaction is an example of an SN2 reaction, leading to the formation of 1-ethoxybutane.

Correct Answer: A — 1-ethoxybutane

Q. What is the major product when 1-bromobutane reacts with sodium ethoxide? (2021)

A. Butane
B. Ethyl butyl ether
C. 1-butanol
D. 2-butanol

Solution

The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.

Correct Answer: B — Ethyl butyl ether

Q. What is the major product when 2-bromobutane is treated with KOH in ethanol?

A. But-1-ene
B. But-2-ene
C. Butane
D. No reaction

Solution

The major product is But-2-ene due to the more stable double bond formed during elimination.

Correct Answer: B — But-2-ene

Q. What is the major product when propene is treated with bromine?

A. 1-bromopropane
B. 2-bromopropane
C. Bromopropane
D. No reaction

Solution

The major product of the reaction of propene with bromine is 2-bromopropane due to anti-addition.

Correct Answer: B — 2-bromopropane

Q. What is the major product when propene reacts with HBr?

A. 1-Bromopropane
B. 2-Bromopropane
C. Propyl bromide
D. Bromopropene

Solution

The major product of the reaction of propene with HBr is 2-Bromopropane due to Markovnikov's rule.

Correct Answer: B — 2-Bromopropane

Q. What is the majority charge carrier in a P-type semiconductor?

A. Electrons
B. Holes
C. Neutrons
D. Protons

Solution

In a P-type semiconductor, holes are the majority charge carriers.

Correct Answer: B — Holes

Q. What is the male gamete in flowering plants called? (2020)

A. Ovule
B. Pollen
C. Style
D. Stigma

Solution

The male gamete in flowering plants is called pollen, which is produced in the anthers of the stamen.

Correct Answer: B — Pollen

Q. What is the male reproductive part of a flower called? (2020)

A. Stigma
B. Anther
C. Ovary
D. Style

Solution

The male reproductive part of a flower is called the stamen, which consists of the anther and filament. The anther is the part that produces pollen.

Correct Answer: B — Anther

Q. What is the mass defect in a nucleus?

A. The difference between the mass of the nucleus and the sum of the masses of its nucleons
B. The mass of the nucleus itself
C. The mass of the electrons surrounding the nucleus
D. The mass of the binding energy

Solution

The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons.

Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its nucleons

Q. What is the mass defect of a nucleus? (2019)

A. The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
B. The mass of the nucleus itself
C. The mass of the electrons surrounding the nucleus
D. The mass of the nucleus in a different state

Solution

The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, which accounts for the binding energy.

Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its individual nucleons

Q. What is the mass of 0.25 moles of glucose (C6H12O6)? (Molar mass = 180 g/mol)

A. 45 g
B. 90 g
C. 60 g
D. 75 g

Solution

Mass = moles × molar mass = 0.25 moles × 180 g/mol = 45 g.

Correct Answer: B — 90 g

Q. What is the mass of 0.5 moles of CaCO3?

A. 50 g
B. 25 g
C. 100 g
D. 75 g

Solution

Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol. Mass = moles x molar mass = 0.5 moles x 100 g/mol = 50 g.

Correct Answer: B — 25 g

Q. What is the mass of 0.5 moles of NaCl?

A. 29 g
B. 58 g
C. 14 g
D. 0.5 g

Solution

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 0.5 moles x 58.5 g/mol = 29.25 g.

Correct Answer: A — 29 g

Q. What is the mass of 0.5 moles of sodium chloride (NaCl)?

A. 29 g
B. 35 g
C. 58 g
D. 70 g

Solution

The molar mass of NaCl is 58 g/mol. Therefore, 0.5 moles of NaCl = 0.5 x 58 g = 29 g.

Correct Answer: C — 58 g

Q. What is the mass of 0.75 moles of sulfuric acid (H2SO4)?

A. 75 g
B. 98 g
C. 147 g
D. 50 g

Solution

Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = moles x molar mass = 0.75 moles x 98 g/mol = 73.5 g.

Correct Answer: B — 98 g

Q. What is the mass of 1 mole of water (H2O)?

A. 18 g
B. 16 g
C. 20 g
D. 22 g

Solution

The molar mass of water (H2O) is 18 g/mol (2*1 for H + 16 for O).

Correct Answer: A — 18 g

Q. What is the mass of 2 moles of carbon dioxide (CO2)?

A. 44 g
B. 22 g
C. 88 g
D. 66 g

Solution

The molar mass of CO2 is 12 g/mol (C) + 16 g/mol x 2 (O) = 44 g/mol. Therefore, 2 moles of CO2 weigh 2 x 44 g = 88 g.

Correct Answer: A — 44 g

Q. What is the mass of 2 moles of sulfuric acid (H2SO4)?

A. 98 g
B. 196 g
C. 294 g
D. 392 g

Solution

Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = 2 moles x 98 g/mol = 196 g.

Correct Answer: B — 196 g

Q. What is the mass of 3 moles of carbon dioxide (CO2)?

A. 44 g
B. 66 g
C. 132 g
D. 22 g

Solution

The molar mass of CO2 is 12 g/mol (C) + 16 g/mol x 2 (O) = 44 g/mol. Therefore, 3 moles of CO2 weigh 3 x 44 g = 132 g.

Correct Answer: A — 44 g

Q. What is the mass of 3 moles of NaCl?

A. 87 g
B. 58.5 g
C. 174 g
D. 3 g

Solution

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 3 moles x 58.5 g/mol = 174 g.

Correct Answer: C — 174 g

Q. What is the mass of 3 moles of NaCl? (2020) 2020

A. 87 g
B. 58.5 g
C. 174 g
D. 3 g

Solution

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 3 moles x 58.5 g/mol = 174 g.

Correct Answer: C — 174 g

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