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. How many molecules are present in 2 moles of water (H2O)? (2022) 2022

A. 6.022 x 10^23
B. 1.2044 x 10^24
C. 3.011 x 10^23
D. 1.2044 x 10^23

Solution

Number of molecules = moles x Avogadro's number = 2 moles x 6.022 x 10^23 molecules/mole = 1.2044 x 10^24 molecules.

Correct Answer: B — 1.2044 x 10^24

Q. How many moles are in 1.5 kg of KCl?

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

Solution

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol. Number of moles = mass/molar mass = 1500 g / 74.5 g/mol ≈ 20.1 moles.

Correct Answer: B — 20

Q. How many moles are in 10 grams of NaOH?

A. 0.25
B. 0.5
C. 0.75
D. 1

Solution

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 10 g / 40 g/mol = 0.25 moles.

Correct Answer: A — 0.25

Q. How many moles are in 100 grams of CaCO3?

A. 1
B. 2
C. 0.5
D. 0.25

Solution

Molar mass of CaCO3 = 40 + 12 + 3*16 = 100 g/mol. Number of moles = mass/molar mass = 100 g / 100 g/mol = 1 mole.

Correct Answer: A — 1

Q. How many moles are in 100 grams of NaOH? (2022)

A. 2.5
B. 1.25
C. 0.5
D. 3

Solution

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 100 g / 40 g/mol = 2.5 moles.

Correct Answer: B — 1.25

Q. How many moles are in 180 grams of water?

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

Solution

Molar mass of H2O = 2*1 + 16 = 18 g/mol. Number of moles = 180 g / 18 g/mol = 10 moles.

Correct Answer: A — 1

Q. How many moles are in 200 grams of H2O?

A. 11.11
B. 10
C. 9
D. 8.89

Solution

Molar mass of H2O = 18 g/mol. Number of moles = mass / molar mass = 200 g / 18 g/mol = 11.11 moles.

Correct Answer: A — 11.11

Q. How many moles are in 200 grams of H2SO4?

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

Solution

Molar mass of H2SO4 = 2 + 32 + 16*4 = 98 g/mol. Number of moles = 200 g / 98 g/mol = 2.04 moles.

Correct Answer: B — 2

Q. How many moles are in 32 grams of O2? (2021)

A. 1
B. 2
C. 0.5
D. 4

Solution

Molar mass of O2 = 16*2 = 32 g/mol. Number of moles = mass/molar mass = 32g/32g/mol = 1 mole.

Correct Answer: A — 1

Q. How many moles are in 36 grams of water (H2O)?

A. 1
B. 2
C. 0.5
D. 3

Solution

Molar mass of H2O = 2*1 + 16 = 18 g/mol. Number of moles = mass/molar mass = 36 g / 18 g/mol = 2 moles.

Correct Answer: A — 1

Q. How many moles are in 5.6 liters of a gas at STP?

A. 0.25
B. 0.5
C. 1
D. 2

Solution

At STP, 1 mole of gas occupies 22.4 L. Number of moles = volume / molar volume = 5.6 L / 22.4 L/mole = 0.25 moles.

Correct Answer: C — 1

Q. How many moles are in 5.6 liters of an ideal gas at STP?

A. 0.25
B. 0.5
C. 1
D. 2

Solution

At STP, 1 mole of gas occupies 22.4 L. Therefore, number of moles = 5.6 L / 22.4 L/mole = 0.25 moles.

Correct Answer: B — 0.5

Q. How many moles are in 50 grams of CaCO3?

A. 0.5
B. 1
C. 1.25
D. 2

Solution

Molar mass of CaCO3 = 100 g/mol. Number of moles = mass / molar mass = 50 g / 100 g/mol = 0.5 moles.

Correct Answer: B — 1

Q. How many moles are in 50 grams of H2O?

A. 2.78
B. 1.39
C. 0.56
D. 3.06

Solution

Molar mass of H2O = 2*1 + 16 = 18 g/mol. Number of moles = mass/molar mass = 50 g / 18 g/mol = 2.78 moles.

Correct Answer: B — 1.39

Q. How many moles are in 50 grams of NaOH?

A. 1
B. 0.5
C. 2
D. 0.25

Solution

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 50 g / 40 g/mol = 1.25 moles.

Correct Answer: B — 0.5

Q. How many moles are in 50 grams of sodium (Na)?

A. 1.08
B. 2.5
C. 0.5
D. 0.25

Solution

Molar mass of Na = 23 g/mol. Number of moles = mass / molar mass = 50 g / 23 g/mol ≈ 2.17 moles.

Correct Answer: A — 1.08

Q. How many moles are in 500 mL of a 2 M NaCl solution?

A. 0.5
B. 1
C. 2
D. 4

Solution

Moles = molarity x volume (in L) = 2 M x 0.5 L = 1 mole.

Correct Answer: B — 1

Q. How many moles are in 88 grams of CH4?

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

Solution

Molar mass of CH4 = 12 + 4*1 = 16 g/mol. Number of moles = mass/molar mass = 88 g / 16 g/mol = 5.5 moles.

Correct Answer: B — 2

Q. How many moles are in 88 grams of O2?

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

Solution

Molar mass of O2 = 16*2 = 32 g/mol. Number of moles = mass/molar mass = 88 g / 32 g/mol = 2.75 moles.

Correct Answer: B — 2

Q. How many moles are in 88 grams of oxygen (O2)?

A. 2
B. 1
C. 4
D. 0.5

Solution

Molar mass of O2 = 32 g/mol. Number of moles = mass / molar mass = 88 g / 32 g/mol = 2.75 moles.

Correct Answer: A — 2

Q. How many moles of CO2 are produced from the complete combustion of 1 mole of C3H8?

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

Solution

C3H8 + 5O2 → 3CO2 + 4H2O. 1 mole of C3H8 produces 3 moles of CO2.

Correct Answer: A — 3

Q. How many moles of KCl are produced when 2 moles of K react with 2 moles of Cl2?

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

Solution

The balanced equation is 2K + Cl2 → 2KCl. Therefore, 2 moles of K will produce 2 moles of KCl.

Correct Answer: B — 2 moles

Q. How many moles of NaOH are produced when 2 moles of Na react with 2 moles of water?

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

Solution

2Na + 2H2O → 2NaOH. Therefore, 2 moles of Na produce 2 moles of NaOH.

Correct Answer: B — 2 moles

Q. How many moles of oxygen are required to completely react with 4 moles of ethane (C2H6)?

A. 5 moles
B. 7 moles
C. 8 moles
D. 10 moles

Solution

The balanced equation is 2C2H6 + 7O2 → 4CO2 + 6H2O. Therefore, 4 moles of C2H6 require 14 moles of O2, which means 7 moles of O2 for 2 moles of C2H6.

Correct Answer: B — 7 moles

Q. How many moles of solute are present in 500 mL of a 0.2 M solution? (2021) 2021

A. 0.1 moles
B. 0.5 moles
C. 0.2 moles
D. 0.25 moles

Solution

Moles = Molarity * Volume (L) = 0.2 M * 0.5 L = 0.1 moles.

Correct Answer: A — 0.1 moles

Q. How many more units did Product X sell compared to Product Y?

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

Solution

Product X sold 300 units and Product Y sold 200 units, so 300 - 200 = 100.

Correct Answer: B — 100

Q. How many multiples of 5 are there between 1 and 50?

A. 8
B. 9
C. 10
D. 11

Solution

The multiples of 5 between 1 and 50 are 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50, totaling 10.

Correct Answer: C — 10

Q. How many Nobel Prizes are awarded annually?

A. 4
B. 5
C. 6
D. 7

Solution

There are 5 Nobel Prizes awarded annually in the fields of Physics, Chemistry, Medicine, Literature, and Peace.

Correct Answer: B — 5

Q. How many orbitals are present in the d-subshell? (2023)

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

Solution

The d-subshell has 5 orbitals.

Correct Answer: C — 5

Q. How many orbitals are present in the p subshell? (2023)

A. 1
B. 2
C. 3
D. 5

Solution

The p subshell has 3 orbitals (px, py, pz).

Correct Answer: C — 3

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