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 role of a diode in a semiconductor circuit?
A.
Amplification
B.
Rectification
C.
Oscillation
D.
Capacitance
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Solution
A diode is primarily used for rectification, allowing current to flow in one direction only.
Correct Answer:
B
— Rectification
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Q. What is the role of a doping element in a semiconductor? (2020)
A.
To increase resistance
B.
To decrease temperature
C.
To change the conductivity
D.
To create a magnetic field
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Solution
Doping elements are added to semiconductors to change their conductivity by introducing additional charge carriers.
Correct Answer:
C
— To change the conductivity
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Q. What is the role of a fuse in an electrical circuit?
A.
To increase current
B.
To decrease voltage
C.
To protect against overload
D.
To store energy
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Solution
A fuse is designed to protect the circuit by breaking the connection when the current exceeds a certain limit.
Correct Answer:
C
— To protect against overload
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Q. What is the role of a moderator in a nuclear reactor?
A.
To absorb neutrons
B.
To slow down neutrons
C.
To increase the temperature
D.
To shield radiation
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Solution
The role of a moderator in a nuclear reactor is to slow down neutrons, making them more likely to induce fission in the fuel.
Correct Answer:
B
— To slow down neutrons
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Q. What is the role of a p-n junction in a semiconductor device?
A.
To increase resistance
B.
To create a depletion region
C.
To enhance thermal conductivity
D.
To reduce current flow
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Solution
A p-n junction creates a depletion region which is essential for the operation of diodes and transistors.
Correct Answer:
B
— To create a depletion region
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Q. What is the role of a Punnett square? (2023)
A.
To determine the phenotype of an organism
B.
To predict the genotypes of offspring
C.
To identify mutations
D.
To analyze genetic disorders
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Solution
A Punnett square is used to predict the genotypes of offspring from a genetic cross.
Correct Answer:
B
— To predict the genotypes of offspring
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Q. What is the role of a resistor in a semiconductor circuit? (2023)
A.
Increase current
B.
Limit current
C.
Store charge
D.
Amplify signal
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Solution
A resistor is used to limit the current flowing through a semiconductor circuit to prevent damage.
Correct Answer:
B
— Limit current
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Q. What is the role of a salt bridge in a galvanic cell?
A.
To provide a pathway for electrons
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The salt bridge maintains charge balance by allowing ions to flow between the two half-cells.
Correct Answer:
B
— To maintain charge balance
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Q. What is the role of a semiconductor in a transistor?
A.
To store charge
B.
To amplify current
C.
To insulate
D.
To generate heat
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Solution
In a transistor, the semiconductor material is used to amplify current, allowing small input signals to control larger output signals.
Correct Answer:
B
— To amplify current
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Q. What is the role of a transformer in an AC circuit? (2023)
A.
To convert AC to DC
B.
To increase or decrease voltage
C.
To store energy
D.
To measure current
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Solution
A transformer is used to increase or decrease voltage in an AC circuit.
Correct Answer:
B
— To increase or decrease voltage
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Q. What is the role of a transistor in electronic circuits?
A.
Switching
B.
Amplification
C.
Signal modulation
D.
All of the above
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Solution
Transistors can perform multiple functions including switching, amplification, and signal modulation.
Correct Answer:
D
— All of the above
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Q. What is the role of a transponder in satellite communication?
A.
To amplify the received signal
B.
To convert signals from one frequency to another
C.
To modulate the signal for transmission
D.
To demodulate the received signal
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Solution
A transponder receives signals at one frequency, amplifies them, and then converts them to another frequency for transmission back to Earth.
Correct Answer:
B
— To convert signals from one frequency to another
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Q. What is the role of activated charcoal in adsorption processes?
A.
Catalyst
B.
Adsorbent
C.
Solvent
D.
Reagent
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Solution
Activated charcoal is commonly used as an adsorbent due to its high surface area and porosity.
Correct Answer:
B
— Adsorbent
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Q. What is the role of Agrobacterium tumefaciens in biotechnology? (2021)
A.
Gene delivery
B.
Protein synthesis
C.
Cell division
D.
DNA replication
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Solution
Agrobacterium tumefaciens is used as a vector for gene delivery in plant biotechnology.
Correct Answer:
A
— Gene delivery
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Q. What is the role of Agrobacterium tumefaciens in genetic engineering? (2022)
A.
It acts as a vector
B.
It is a source of restriction enzymes
C.
It is used for DNA sequencing
D.
It helps in protein synthesis
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Solution
Agrobacterium tumefaciens is used as a vector to transfer genes into plant cells.
Correct Answer:
A
— It acts as a vector
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Q. What is the role of aldosterone in the body? (2021)
A.
Increase blood glucose
B.
Regulate sodium and potassium levels
C.
Stimulate milk production
D.
Enhance immune response
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Solution
Aldosterone is a hormone produced by the adrenal cortex that helps regulate sodium and potassium levels, thus influencing blood pressure.
Correct Answer:
B
— Regulate sodium and potassium levels
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Q. What is the role of an oxidizing agent in a redox reaction? (2020)
A.
It gains electrons
B.
It loses electrons
C.
It remains unchanged
D.
It increases the temperature
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Solution
An oxidizing agent gains electrons during a redox reaction, causing another species to be oxidized.
Correct Answer:
A
— It gains electrons
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Q. What is the role of antioxidants in food?
A.
Enhancing flavor
B.
Preventing spoilage
C.
Reducing oxidation
D.
Increasing acidity
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Solution
Antioxidants prevent oxidation, which can spoil food and reduce its nutritional value.
Correct Answer:
C
— Reducing oxidation
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Q. What is the role of antioxidants in nutrition? (2022)
A.
Energy production
B.
Cell protection
C.
Muscle growth
D.
Hormone regulation
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Solution
Antioxidants play a role in cell protection by neutralizing free radicals that can cause cellular damage.
Correct Answer:
B
— Cell protection
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Q. What is the role of antioxidants in the body?
A.
Increase energy
B.
Prevent oxidation
C.
Enhance digestion
D.
Boost immunity
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Solution
Antioxidants prevent oxidation, which can damage cells and lead to various diseases.
Correct Answer:
B
— Prevent oxidation
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Q. What is the role of ATP in cells?
A.
Storage of genetic information
B.
Energy currency
C.
Structural component
D.
Signal transduction
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Solution
ATP (adenosine triphosphate) serves as the primary energy currency in cells.
Correct Answer:
B
— Energy currency
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Q. What is the role of auxins in plant growth?
A.
Promote flowering
B.
Stimulate root growth
C.
Inhibit growth
D.
Promote cell elongation
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Solution
Auxins are plant hormones that promote cell elongation, which is crucial for growth and development in plants.
Correct Answer:
D
— Promote cell elongation
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Q. What is the role of biopesticides in agriculture? (2021)
A.
Increase soil fertility
B.
Control pest populations
C.
Enhance crop yield
D.
Improve water retention
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Solution
Biopesticides are used to control pest populations in an environmentally friendly manner, reducing the reliance on chemical pesticides.
Correct Answer:
B
— Control pest populations
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Q. What is the role of Bt toxin in genetically modified crops? (2022)
A.
Enhances growth rate
B.
Provides resistance to herbivores
C.
Increases photosynthesis
D.
Improves soil quality
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Solution
Bt toxin is produced by Bacillus thuringiensis and provides resistance to certain insect pests.
Correct Answer:
B
— Provides resistance to herbivores
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Q. What is the role of caffeine in coffee?
A.
Antioxidant
B.
Stimulant
C.
Sedative
D.
Digestive aid
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Solution
Caffeine acts as a stimulant, increasing alertness and reducing fatigue.
Correct Answer:
B
— Stimulant
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Q. What is the role of calcium ions in muscle contraction? (2022)
A.
To provide energy
B.
To bind to troponin
C.
To stimulate nerve impulses
D.
To form cross-bridges
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Solution
Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.
Correct Answer:
B
— To bind to troponin
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Q. What is the role of chlorofluorocarbons (CFCs) in environmental chemistry?
A.
Ozone depletion
B.
Greenhouse gas effect
C.
Acid rain formation
D.
Water pollution
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Solution
CFCs are known to deplete the ozone layer, leading to increased UV radiation reaching the Earth's surface.
Correct Answer:
A
— Ozone depletion
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Q. What is the role of chlorophyll in leaves? (2023)
A.
Water storage
B.
Nutrient absorption
C.
Photosynthesis
D.
Gas exchange
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Solution
Chlorophyll is essential for photosynthesis as it captures light energy to convert carbon dioxide and water into glucose.
Correct Answer:
C
— Photosynthesis
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Q. What is the role of chloroplasts in plant cells? (2021)
A.
Respiration
B.
Photosynthesis
C.
Digestion
D.
Reproduction
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Solution
Chloroplasts are responsible for photosynthesis, converting light energy into chemical energy.
Correct Answer:
B
— Photosynthesis
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Q. What is the role of coherence in interference phenomena?
A.
It determines the intensity of light
B.
It ensures constant phase difference
C.
It affects the wavelength
D.
It changes the speed of light
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Solution
Coherence refers to the constant phase relationship between waves, which is essential for producing stable interference patterns.
Correct Answer:
B
— It ensures constant phase difference
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