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. What is the main cause of the depletion of the ozone layer?
A.
Carbon dioxide emissions
B.
CFCs and halons
C.
Methane emissions
D.
Nitrogen oxides
Show solution
Solution
CFCs and halons are the primary substances responsible for the depletion of the ozone layer.
Correct Answer:
B
— CFCs and halons
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Q. What is the main cause of the greenhouse effect?
A.
Deforestation
B.
Fossil fuel combustion
C.
Agricultural practices
D.
Industrial waste
Show solution
Solution
Fossil fuel combustion is the main cause of the greenhouse effect, leading to increased levels of greenhouse gases.
Correct Answer:
B
— Fossil fuel combustion
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Q. What is the main cause of the increase in atmospheric carbon dioxide levels?
A.
Deforestation
B.
Volcanic activity
C.
Ocean absorption
D.
Photosynthesis
Show solution
Solution
Deforestation reduces the number of trees that can absorb CO2, leading to higher atmospheric levels.
Correct Answer:
A
— Deforestation
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Q. What is the main cause of tuberculosis? (2019)
A.
Bacterial infection
B.
Viral infection
C.
Fungal infection
D.
Parasitic infection
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Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer:
A
— Bacterial infection
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Q. What is the main characteristic of a black body in terms of radiation? (2019)
A.
Reflects all radiation
B.
Absorbs all radiation
C.
Transmits all radiation
D.
Scatters all radiation
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Solution
A black body absorbs all radiation incident on it, making it an ideal emitter of thermal radiation.
Correct Answer:
B
— Absorbs all radiation
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Q. What is the main characteristic of a black body?
A.
It reflects all incident light
B.
It absorbs all incident light
C.
It emits light only at high temperatures
D.
It emits light only at low temperatures
Show solution
Solution
A black body is characterized by its ability to absorb all incident light, regardless of frequency or angle of incidence.
Correct Answer:
B
— It absorbs all incident light
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Q. What is the main characteristic of a catalyst in surface chemistry?
A.
It increases the rate of reaction by changing the equilibrium.
B.
It is consumed in the reaction.
C.
It provides an alternative reaction pathway.
D.
It decreases the activation energy of the reaction.
Show solution
Solution
A catalyst provides an alternative reaction pathway, which lowers the activation energy and increases the reaction rate.
Correct Answer:
C
— It provides an alternative reaction pathway.
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Q. What is the main characteristic of a catalyst in surface reactions?
A.
It is consumed in the reaction.
B.
It lowers the activation energy.
C.
It increases the temperature of the reaction.
D.
It changes the equilibrium constant.
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Solution
A catalyst lowers the activation energy of a reaction without being consumed in the process.
Correct Answer:
B
— It lowers the activation energy.
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Q. What is the main characteristic of a molecular solid? (2021)
A.
High melting point
B.
Low melting point
C.
Good electrical conductivity
D.
High density
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Solution
Molecular solids generally have low melting points due to weak intermolecular forces.
Correct Answer:
B
— Low melting point
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Q. What is the main characteristic of amorphous solids? (2023)
A.
Long-range order
B.
Short-range order
C.
Definite melting point
D.
Anisotropic
Show solution
Solution
Amorphous solids lack long-range order, which distinguishes them from crystalline solids.
Correct Answer:
B
— Short-range order
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Q. What is the main characteristic of cardiac muscle tissue? (2023)
A.
Multinucleated
B.
Involuntary and striated
C.
Non-striated and voluntary
D.
Highly regenerative
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Solution
Cardiac muscle tissue is involuntary and striated, found only in the heart, and is responsible for pumping blood.
Correct Answer:
B
— Involuntary and striated
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Q. What is the main characteristic of elastomers?
A.
Brittle
B.
Elastic
C.
Rigid
D.
Transparent
Show solution
Solution
Elastomers are characterized by their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer:
B
— Elastic
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Q. What is the main characteristic of geometric isomers?
A.
Different connectivity
B.
Different spatial arrangement
C.
Different molecular formula
D.
Different functional groups
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Solution
Geometric isomers have the same connectivity but differ in the spatial arrangement of groups around a double bond.
Correct Answer:
B
— Different spatial arrangement
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Q. What is the main characteristic of mammals? (2021)
A.
Cold-blooded
B.
Feathers
C.
Hair or fur
D.
Scales
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Solution
Mammals are characterized by the presence of hair or fur and mammary glands that produce milk.
Correct Answer:
C
— Hair or fur
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Q. What is the main characteristic of optical isomers?
A.
Different boiling points
B.
Different melting points
C.
Different optical activities
D.
Different molecular weights
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Solution
Optical isomers differ in their ability to rotate plane-polarized light.
Correct Answer:
C
— Different optical activities
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Q. What is the main characteristic of organisms in the phylum Mollusca? (2022)
A.
Jointed appendages
B.
Soft-bodied with a hard shell
C.
Radial symmetry
D.
Exoskeleton
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Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer:
B
— Soft-bodied with a hard shell
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Q. What is the main characteristic of organisms in the phylum Porifera? (2022)
A.
Presence of a true coelom
B.
Body symmetry
C.
Presence of pores
D.
Presence of a notochord
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Solution
Organisms in the phylum Porifera, commonly known as sponges, are characterized by the presence of pores in their body.
Correct Answer:
C
— Presence of pores
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Q. What is the main characteristic of the phylum Mollusca? (2021)
A.
Jointed legs
B.
Soft-bodied with a hard shell
C.
Radial symmetry
D.
Exoskeleton made of chitin
Show solution
Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer:
B
— Soft-bodied with a hard shell
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Q. What is the main characteristic of the phylum Porifera? (2021)
A.
Presence of a true coelom
B.
Body symmetry
C.
Presence of pores
D.
Presence of a notochord
Show solution
Solution
Porifera, or sponges, are characterized by the presence of numerous pores (ostia) in their body.
Correct Answer:
C
— Presence of pores
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Q. What is the main component of a nuclear reactor that slows down neutrons? (2023)
A.
Control rods
B.
Moderator
C.
Coolant
D.
Shielding
Show solution
Solution
The moderator is the main component in a nuclear reactor that slows down neutrons to sustain the nuclear chain reaction.
Correct Answer:
B
— Moderator
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Q. What is the main component of air?
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Argon
Show solution
Solution
Nitrogen makes up about 78% of the Earth's atmosphere, making it the main component of air.
Correct Answer:
B
— Nitrogen
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Q. What is the main component of cell membranes?
A.
Proteins
B.
Carbohydrates
C.
Phospholipids
D.
Nucleic acids
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Solution
Phospholipids are the main component of cell membranes, forming a bilayer.
Correct Answer:
C
— Phospholipids
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Q. What is the main component of natural gas?
A.
Ethane
B.
Propane
C.
Methane
D.
Butane
Show solution
Solution
The main component of natural gas is methane (CH4).
Correct Answer:
C
— Methane
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Q. What is the main component of natural rubber?
A.
Polyisoprene
B.
Polystyrene
C.
Polyethylene
D.
Polyvinyl acetate
Show solution
Solution
Natural rubber is primarily composed of polyisoprene, which is derived from latex.
Correct Answer:
A
— Polyisoprene
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Q. What is the main component of plasma in blood? (2023)
A.
Water
B.
Proteins
C.
Electrolytes
D.
Hormones
Show solution
Solution
Plasma is primarily composed of about 90% water, which serves as a solvent for various substances in the blood.
Correct Answer:
A
— Water
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Q. What is the main component of smog?
A.
Ozone
B.
Carbon dioxide
C.
Nitrogen
D.
Sulfur dioxide
Show solution
Solution
Ozone is a major component of smog, particularly in urban areas during sunny days.
Correct Answer:
A
— Ozone
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Q. What is the main component of the cell membrane?
A.
Proteins
B.
Carbohydrates
C.
Phospholipids
D.
Nucleic acids
Show solution
Solution
Phospholipids are the main component of cell membranes, forming a bilayer.
Correct Answer:
C
— Phospholipids
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Q. What is the main component of the cell wall in plant cells? (2023)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
Show solution
Solution
The cell wall of plant cells is primarily made of cellulose, which provides structural support.
Correct Answer:
A
— Cellulose
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Q. What is the main component of the cell wall in plants? (2022)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
Show solution
Solution
The main component of the plant cell wall is cellulose.
Correct Answer:
A
— Cellulose
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Q. What is the main component of the Earth's atmosphere? (2022)
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Argon
Show solution
Solution
Nitrogen is the main component of the Earth's atmosphere, making up about 78% of it.
Correct Answer:
B
— Nitrogen
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