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!
Q. Which of the following statements about hydrogen is incorrect? (2019)
A.
Hydrogen is the lightest element.
B.
Hydrogen can form covalent bonds.
C.
Hydrogen exists as a diatomic molecule in nature.
D.
Hydrogen is a metal at room temperature.
Show solution
Solution
Hydrogen is a non-metal at room temperature and does not exhibit metallic properties.
Correct Answer:
D
— Hydrogen is a metal at room temperature.
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Q. Which of the following statements about ideal solutions is true?
A.
They obey Raoult's law at all concentrations
B.
They have a constant boiling point
C.
They have a constant density
D.
They do not exhibit colligative properties
Show solution
Solution
Ideal solutions obey Raoult's law at all concentrations, meaning their vapor pressures are proportional to the mole fractions.
Correct Answer:
A
— They obey Raoult's law at all concentrations
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Q. Which of the following statements about inductive effect is correct?
A.
It is a permanent effect
B.
It is a temporary effect
C.
It only affects alkenes
D.
It increases basicity
Show solution
Solution
Inductive effect is a permanent effect due to the electronegativity of atoms or groups.
Correct Answer:
A
— It is a permanent effect
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Q. Which of the following statements about isomerism is FALSE?
A.
Isomers have the same molecular formula.
B.
Isomers have different physical properties.
C.
Isomers have different chemical properties.
D.
Isomers cannot exist in the same physical state.
Show solution
Solution
Isomers can exist in the same physical state, such as liquid or solid.
Correct Answer:
D
— Isomers cannot exist in the same physical state.
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Q. Which of the following statements about isomerism is true?
A.
Isomers have the same molecular formula
B.
Isomers have different molecular formulas
C.
Isomers have the same physical properties
D.
Isomers cannot exist in the same compound
Show solution
Solution
Isomers have the same molecular formula but differ in the arrangement of atoms.
Correct Answer:
A
— Isomers have the same molecular formula
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Q. Which of the following statements about isomers is true?
A.
Isomers have different molecular formulas
B.
Isomers have the same connectivity of atoms
C.
Isomers have different physical and chemical properties
D.
Isomers cannot exist in the same compound
Show solution
Solution
Isomers can have different physical and chemical properties despite having the same molecular formula.
Correct Answer:
C
— Isomers have different physical and chemical properties
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Q. Which of the following statements about isotopes is true?
A.
Isotopes have the same number of protons
B.
Isotopes have different chemical properties
C.
Isotopes have different numbers of protons
D.
Isotopes are always radioactive
Show solution
Solution
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
Correct Answer:
A
— Isotopes have the same number of protons
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Q. Which of the following statements about kinetic friction is true?
A.
It is always greater than static friction.
B.
It depends on the speed of the object.
C.
It is independent of the contact area.
D.
It increases with increasing normal force.
Show solution
Solution
Kinetic friction is independent of the contact area and depends only on the normal force and the coefficient of kinetic friction.
Correct Answer:
C
— It is independent of the contact area.
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Q. Which of the following statements about lenses is true?
A.
Concave lenses converge light rays
B.
Convex lenses diverge light rays
C.
Concave lenses produce virtual images
D.
Convex lenses have negative focal lengths
Show solution
Solution
Concave lenses always produce virtual images when the object is placed within the focal length.
Correct Answer:
C
— Concave lenses produce virtual images
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Q. Which of the following statements about liquids is true?
A.
They have a definite shape.
B.
They are incompressible.
C.
They have a fixed volume.
D.
Both B and C
Show solution
Solution
Liquids are incompressible and have a fixed volume, but they do not have a definite shape.
Correct Answer:
D
— Both B and C
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Q. Which of the following statements about magnetic field lines is true?
A.
They can cross each other
B.
They are always straight lines
C.
They form closed loops
D.
They originate from magnetic monopoles
Show solution
Solution
Magnetic field lines always form closed loops, indicating that magnetic field lines do not start or end but continue indefinitely.
Correct Answer:
C
— They form closed loops
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Q. Which of the following statements about mesomeric effect is true?
A.
It involves only sigma bonds.
B.
It is a permanent effect.
C.
It is weaker than the inductive effect.
D.
It does not involve resonance structures.
Show solution
Solution
The mesomeric effect is a permanent effect that involves the delocalization of electrons through pi bonds and resonance structures.
Correct Answer:
B
— It is a permanent effect.
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Q. Which of the following statements about metallic bonding is true?
A.
Electrons are localized
B.
Electrons are delocalized
C.
Only positive ions are present
D.
It involves sharing of electrons
Show solution
Solution
In metallic bonding, electrons are delocalized, allowing for conductivity and malleability.
Correct Answer:
B
— Electrons are delocalized
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Q. Which of the following statements about molarity is true?
A.
It changes with temperature.
B.
It is independent of temperature.
C.
It is defined as moles of solute per liter of solvent.
D.
It is always equal to molality.
Show solution
Solution
Molarity is defined as moles of solute per liter of solution, and it can change with temperature due to volume changes.
Correct Answer:
A
— It changes with temperature.
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Q. Which of the following statements about molecular orbitals is correct?
A.
Molecular orbitals are formed by the overlap of atomic orbitals.
B.
Molecular orbitals can only be occupied by one electron.
C.
Bonding molecular orbitals have higher energy than antibonding orbitals.
D.
Molecular orbitals do not influence the shape of molecules.
Show solution
Solution
Molecular orbitals are indeed formed by the overlap of atomic orbitals.
Correct Answer:
A
— Molecular orbitals are formed by the overlap of atomic orbitals.
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Q. Which of the following statements about molecular orbitals is incorrect?
A.
Molecular orbitals can be occupied by a maximum of two electrons.
B.
Bonding orbitals are lower in energy than antibonding orbitals.
C.
Molecular orbitals are formed from the linear combination of atomic orbitals.
D.
All molecular orbitals are degenerate.
Show solution
Solution
Not all molecular orbitals are degenerate; some can have different energy levels.
Correct Answer:
D
— All molecular orbitals are degenerate.
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Q. Which of the following statements about molecular orbitals is true?
A.
Molecular orbitals are formed by the overlap of atomic orbitals.
B.
Molecular orbitals can only be occupied by one electron.
C.
Molecular orbitals do not have any energy levels.
D.
Molecular orbitals are only found in diatomic molecules.
Show solution
Solution
Molecular orbitals are indeed formed by the overlap of atomic orbitals.
Correct Answer:
A
— Molecular orbitals are formed by the overlap of atomic orbitals.
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Q. Which of the following statements about multiples is true?
A.
The multiples of a number are infinite.
B.
The multiples of a number are always positive.
C.
The first multiple of any number is the number itself.
D.
All of the above.
Show solution
Solution
All statements are true regarding multiples.
Correct Answer:
D
— All of the above.
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Q. Which of the following statements about negative exponents is correct?
A.
They indicate a reciprocal of the base raised to the positive exponent.
B.
They always result in a negative number.
C.
They can only be applied to integers.
D.
They are not applicable in real number systems.
Show solution
Solution
Negative exponents indicate the reciprocal of the base raised to the positive exponent.
Correct Answer:
A
— They indicate a reciprocal of the base raised to the positive exponent.
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Q. Which of the following statements about number systems is true?
A.
Base-10 is the only positional system
B.
Base-2 can represent all integers
C.
Base-16 is less efficient than base-10
D.
Base-5 cannot represent fractions
Show solution
Solution
Base-2 can represent all integers, as it is a complete positional system.
Correct Answer:
B
— Base-2 can represent all integers
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Q. Which of the following statements about numeral systems is correct?
A.
All numeral systems are based on the same principles.
B.
Different numeral systems can represent the same value.
C.
The decimal system is the only system used in mathematics.
D.
Base systems are irrelevant in modern computing.
Show solution
Solution
Different numeral systems can represent the same value, such as the decimal 10 and binary 1010.
Correct Answer:
B
— Different numeral systems can represent the same value.
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Q. Which of the following statements about numeral systems is incorrect?
A.
Base-10 is the most commonly used system.
B.
Base-16 is used in color codes in web design.
C.
Base-2 is used in human languages.
D.
Base-8 is less common than base-2.
Show solution
Solution
Base-2 (binary) is not used in human languages; it is primarily used in computing.
Correct Answer:
C
— Base-2 is used in human languages.
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Q. Which of the following statements about optical isomers is true?
A.
They have the same physical properties
B.
They rotate plane-polarized light in opposite directions
C.
They have different molecular formulas
D.
They are always chiral
Show solution
Solution
Optical isomers, or enantiomers, rotate plane-polarized light in opposite directions.
Correct Answer:
B
— They rotate plane-polarized light in opposite directions
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Q. Which of the following statements about parthenogenesis is true? (2020)
A.
It involves fertilization
B.
It is a form of sexual reproduction
C.
It produces offspring from unfertilized eggs
D.
It is common in mammals
Show solution
Solution
Parthenogenesis is a form of asexual reproduction where offspring develop from unfertilized eggs.
Correct Answer:
C
— It produces offspring from unfertilized eggs
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Q. Which of the following statements about partnerships is FALSE? (2023)
A.
Partners share profits and losses.
B.
All partners have equal say in business decisions.
C.
Partnerships can be formed without a written agreement.
D.
Partners are personally liable for business debts.
Show solution
Solution
Not all partners have equal say; the partnership agreement can specify different levels of authority.
Correct Answer:
B
— All partners have equal say in business decisions.
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Q. Which of the following statements about partnerships is true?
A.
All partners must have equal say in decisions
B.
Partnerships are always limited liability
C.
Partners can be held personally liable for business debts
D.
Partnerships cannot have more than two partners
Show solution
Solution
In a general partnership, partners can be held personally liable for the debts of the business.
Correct Answer:
C
— Partners can be held personally liable for business debts
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Q. Which of the following statements about phenols is true?
A.
They are weak acids.
B.
They are strong bases.
C.
They do not react with bromine.
D.
They are insoluble in water.
Show solution
Solution
Phenols are weak acids due to the ability of the hydroxyl group to donate a proton.
Correct Answer:
A
— They are weak acids.
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Q. Which of the following statements about plasma is true? (2023)
A.
It has a definite shape and volume
B.
It is a good conductor of electricity
C.
It has low energy
D.
It is the most common state of matter in the universe
Show solution
Solution
Plasma is the most common state of matter in the universe, found in stars and interstellar space.
Correct Answer:
D
— It is the most common state of matter in the universe
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Q. Which of the following statements about polarized light is true?
A.
It can pass through any material without obstruction
B.
It vibrates in multiple planes
C.
It vibrates in a single plane
D.
It has a higher speed than unpolarized light
Show solution
Solution
Polarized light vibrates in a single plane, unlike unpolarized light which vibrates in multiple planes.
Correct Answer:
C
— It vibrates in a single plane
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Q. Which of the following statements about power is true?
A.
Power is always conserved
B.
Power can be negative
C.
Power is independent of time
D.
Power is a scalar quantity
Show solution
Solution
Power can be negative when work is done against the direction of motion, such as in friction. Therefore, the correct statement is that power can be negative.
Correct Answer:
B
— Power can be negative
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