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 effect of doping a semiconductor?
A.
Increases resistance
B.
Decreases resistance
C.
No effect
D.
Makes it an insulator
Show solution
Solution
Doping a semiconductor decreases its resistance by introducing additional charge carriers.
Correct Answer:
B
— Decreases resistance
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Q. What is the effect of doping on the conductivity of a semiconductor?
A.
Decreases conductivity
B.
Increases conductivity
C.
No effect
D.
Makes it an insulator
Show solution
Solution
Doping a semiconductor increases its conductivity by introducing additional charge carriers.
Correct Answer:
B
— Increases conductivity
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Q. What is the effect of doping on the conductivity of semiconductors?
A.
Decreases conductivity
B.
Increases conductivity
C.
No effect
D.
Makes it insulative
Show solution
Solution
Doping increases the conductivity of semiconductors by introducing additional charge carriers.
Correct Answer:
B
— Increases conductivity
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Q. What is the effect of doubling the distance from a long straight wire on the magnetic field strength?
A.
It doubles the magnetic field strength
B.
It halves the magnetic field strength
C.
It quadruples the magnetic field strength
D.
It has no effect on the magnetic field strength
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Solution
According to the Biot-Savart Law, the magnetic field strength is inversely proportional to the distance, so doubling the distance halves the magnetic field strength.
Correct Answer:
B
— It halves the magnetic field strength
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Q. What is the effect of electron-donating groups on the basicity of amines?
A.
Increase basicity
B.
Decrease basicity
C.
No effect
D.
Depends on the solvent
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Solution
Electron-donating groups increase the electron density on the nitrogen atom, thus increasing the basicity of amines.
Correct Answer:
A
— Increase basicity
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Q. What is the effect of electron-withdrawing groups on the basicity of amines?
A.
Increase basicity
B.
Decrease basicity
C.
No effect
D.
Varies with the group
Show solution
Solution
Electron-withdrawing groups decrease the basicity of amines by reducing the electron density on the nitrogen atom.
Correct Answer:
B
— Decrease basicity
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Q. What is the effect of frequency on the inductive reactance? (2023)
A.
Directly proportional
B.
Inversely proportional
C.
No effect
D.
Depends on the resistance
Show solution
Solution
Inductive reactance is directly proportional to frequency; as frequency increases, inductive reactance increases.
Correct Answer:
A
— Directly proportional
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Q. What is the effect of gibberellins on seed germination? (2020)
A.
Inhibits germination
B.
Promotes germination
C.
No effect
D.
Causes premature germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer:
B
— Promotes germination
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Q. What is the effect of heavy metals in the environment? (2023)
A.
Nutrient enrichment
B.
Toxicity to organisms
C.
Soil improvement
D.
Water purification
Show solution
Solution
Heavy metals can be toxic to organisms, leading to bioaccumulation and harmful effects on ecosystems.
Correct Answer:
B
— Toxicity to organisms
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Q. What is the effect of high protein intake on urea production? (2022)
A.
Decreases urea production
B.
Increases urea production
C.
No effect on urea production
D.
Increases ammonia production
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Solution
High protein intake increases the production of urea as more amino acids are metabolized.
Correct Answer:
B
— Increases urea production
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Q. What is the effect of increasing electronegativity difference on bond character?
A.
Increases covalent character
B.
Decreases ionic character
C.
Increases ionic character
D.
No effect
Show solution
Solution
Increasing electronegativity difference between two atoms leads to an increase in ionic character of the bond.
Correct Answer:
C
— Increases ionic character
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Q. What is the effect of increasing pressure on a gas at constant temperature? (2014)
A.
Volume increases
B.
Volume decreases
C.
No effect on volume
D.
Gas becomes a liquid
Show solution
Solution
According to Boyle's Law, increasing pressure on a gas at constant temperature results in a decrease in volume.
Correct Answer:
B
— Volume decreases
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Q. What is the effect of increasing pressure on the boiling point of a liquid?
A.
Boiling point decreases
B.
Boiling point increases
C.
No effect
D.
Boiling point becomes constant
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Solution
Increasing pressure raises the boiling point of a liquid.
Correct Answer:
B
— Boiling point increases
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Q. What is the effect of increasing pressure on the equilibrium of the reaction: 2N2(g) + 3H2(g) ⇌ 2NH3(g)? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase in temperature
Show solution
Solution
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. In this case, it shifts to the right, producing more NH3.
Correct Answer:
B
— Shift to the right
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Q. What is the effect of increasing resistance in a series RLC circuit at resonance? (2023)
A.
Increases current
B.
Decreases current
C.
No effect on current
D.
Increases voltage
Show solution
Solution
Increasing resistance in a series RLC circuit at resonance will decrease the current, as the impedance increases.
Correct Answer:
B
— Decreases current
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Q. What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?
A.
It makes ΔG more negative.
B.
It makes ΔG less negative.
C.
It has no effect on ΔG.
D.
It makes ΔG positive.
Show solution
Solution
Increasing temperature will make ΔG more negative for a reaction with a negative ΔH and positive ΔS, enhancing spontaneity.
Correct Answer:
A
— It makes ΔG more negative.
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Q. What is the effect of increasing temperature on a reaction with ΔH > 0 and ΔS < 0?
A.
Increases spontaneity
B.
Decreases spontaneity
C.
No effect on spontaneity
D.
Makes it spontaneous at high temperatures
Show solution
Solution
For a reaction with ΔH > 0 and ΔS < 0, increasing temperature will make ΔG more positive, thus decreasing spontaneity.
Correct Answer:
B
— Decreases spontaneity
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Q. What is the effect of increasing temperature on an exothermic reaction at equilibrium?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase the rate of reaction
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer:
B
— Shift to the left
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Q. What is the effect of increasing temperature on chemisorption? (2022)
A.
Increases adsorption
B.
Decreases adsorption
C.
No effect
D.
Depends on the gas
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Solution
Chemisorption is an exothermic process, and increasing temperature generally decreases the extent of chemisorption.
Correct Answer:
B
— Decreases adsorption
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Q. What is the effect of increasing temperature on physisorption?
A.
Increases adsorption
B.
Decreases adsorption
C.
No effect
D.
Depends on the adsorbate
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Solution
Increasing temperature generally decreases physisorption because it disrupts the weak van der Waals forces.
Correct Answer:
B
— Decreases adsorption
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Q. What is the effect of increasing temperature on the cell potential according to the Nernst equation?
A.
Increases cell potential
B.
Decreases cell potential
C.
No effect
D.
Depends on the reaction
Show solution
Solution
The effect of increasing temperature on cell potential depends on the reaction and its enthalpy change.
Correct Answer:
D
— Depends on the reaction
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Q. What is the effect of increasing temperature on the cell potential?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the reaction
Show solution
Solution
The effect of temperature on cell potential depends on the reaction and its enthalpy change.
Correct Answer:
D
— Depends on the reaction
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Q. What is the effect of increasing temperature on the conductivity of an electrolyte solution? (2019)
A.
Increases conductivity
B.
Decreases conductivity
C.
No effect
D.
Depends on the electrolyte
Show solution
Solution
Increasing temperature generally increases the conductivity of an electrolyte solution due to increased ion mobility.
Correct Answer:
A
— Increases conductivity
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Q. What is the effect of increasing temperature on the density of a gas?
A.
Increases density
B.
Decreases density
C.
No effect
D.
Depends on pressure
Show solution
Solution
Increasing the temperature of a gas generally decreases its density, as the gas expands.
Correct Answer:
B
— Decreases density
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Q. What is the effect of increasing temperature on the density of liquids?
A.
Density increases
B.
Density decreases
C.
Density remains constant
D.
Density fluctuates randomly
Show solution
Solution
Generally, the density of liquids decreases with an increase in temperature.
Correct Answer:
B
— Density decreases
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Q. What is the effect of increasing temperature on the entropy of a substance?
A.
Entropy decreases
B.
Entropy increases
C.
Entropy remains constant
D.
Entropy becomes zero
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Solution
Increasing temperature generally increases the kinetic energy of particles, leading to greater disorder and thus an increase in entropy.
Correct Answer:
B
— Entropy increases
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Q. What is the effect of increasing temperature on the entropy of a system?
A.
Increases entropy
B.
Decreases entropy
C.
No effect
D.
Depends on the system
Show solution
Solution
Increasing temperature generally increases the entropy of a system as the molecular motion becomes more chaotic.
Correct Answer:
A
— Increases entropy
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Q. What is the effect of increasing temperature on the equilibrium constant Kc for an endothermic reaction?
A.
Kc increases
B.
Kc decreases
C.
Kc remains constant
D.
Kc becomes zero
Show solution
Solution
For endothermic reactions, increasing temperature shifts the equilibrium to the right, increasing Kc.
Correct Answer:
A
— Kc increases
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Q. What is the effect of increasing temperature on the equilibrium constant of an exothermic reaction?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
According to Le Chatelier's principle, increasing the temperature of an exothermic reaction shifts the equilibrium to the left, decreasing the equilibrium constant.
Correct Answer:
B
— Decreases
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Q. What is the effect of increasing temperature on the equilibrium constant of an endothermic reaction?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the reaction
Show solution
Solution
For an endothermic reaction, increasing the temperature increases the equilibrium constant.
Correct Answer:
A
— Increases
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