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 temperature on the solubility of most solid solutes in liquids? (2022)
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Varies with the solute
Show solution
Solution
For most solid solutes, solubility in liquids increases with temperature due to increased kinetic energy of the molecules.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the solubility of most solid solutes in water? (2023)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies unpredictably
Show solution
Solution
For most solid solutes, solubility increases with an increase in temperature.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the speed of sound in air?
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Increases then decreases
Show solution
Solution
The speed of sound in air increases with an increase in temperature.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the surface tension of a liquid?
A.
Surface tension increases with temperature
B.
Surface tension decreases with temperature
C.
Surface tension remains constant with temperature
D.
Surface tension is independent of the nature of the liquid
Show solution
Solution
As temperature increases, the kinetic energy of the molecules increases, leading to a decrease in cohesive forces and thus a decrease in surface tension.
Correct Answer:
B
— Surface tension decreases with temperature
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Q. What is the effect of temperature on the surface tension of water?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies unpredictably
Show solution
Solution
Surface tension decreases with an increase in temperature due to increased molecular motion.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of temperature on the vapor pressure of a solvent according to Raoult's Law?
A.
Vapor pressure decreases with temperature
B.
Vapor pressure increases with temperature
C.
Vapor pressure remains constant with temperature
D.
Vapor pressure is independent of the solvent
Show solution
Solution
According to Raoult's Law, the vapor pressure of a solvent increases with an increase in temperature.
Correct Answer:
B
— Vapor pressure increases with temperature
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Q. What is the effect of temperature on the viscosity of a liquid? (2020)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
Show solution
Solution
The viscosity of a liquid generally decreases with an increase in temperature, making it flow more easily.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of temperature on the viscosity of liquids?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
Show solution
Solution
For most liquids, viscosity decreases with an increase in temperature due to increased molecular motion.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of the +M effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
Show solution
Solution
The +M effect stabilizes the carbocation by donating electron density through resonance.
Correct Answer:
B
— Stabilizes the carbocation
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Q. What is the effect of the -I effect on acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
Show solution
Solution
The -I effect increases acidity by stabilizing the negative charge on the conjugate base.
Correct Answer:
A
— Increases acidity
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Q. What is the effect of the -I group on acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
Show solution
Solution
Electron-withdrawing groups (-I) increase the acidity of compounds by stabilizing the negative charge on the conjugate base.
Correct Answer:
A
— Increases acidity
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Q. What is the effect of the -M (mesomeric) effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
Show solution
Solution
The -M effect can stabilize a carbocation by delocalizing the positive charge.
Correct Answer:
B
— Stabilizes the carbocation
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Q. What is the effect of the -M group on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
Show solution
Solution
-M groups destabilize carbocations by withdrawing electron density through resonance.
Correct Answer:
A
— Destabilizes the carbocation
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Q. What is the effect of the author's tone throughout the passage? (2023)
A.
It creates a sense of urgency.
B.
It fosters a feeling of nostalgia.
C.
It encourages critical reflection.
D.
It promotes a carefree attitude.
Show solution
Solution
The author's tone encourages readers to reflect critically on the issues discussed, making option 2 the correct answer.
Correct Answer:
C
— It encourages critical reflection.
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Q. What is the effect of the author's use of rhetorical questions in the passage?
A.
To confuse the reader
B.
To provoke thought and engagement
C.
To provide clear answers
D.
To dismiss opposing viewpoints
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Solution
The use of rhetorical questions is intended to provoke thought and engagement from the reader, encouraging them to reflect on the issues presented.
Correct Answer:
B
— To provoke thought and engagement
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Q. What is the effect of the author's use of rhetorical questions?
A.
To engage the reader
B.
To confuse the reader
C.
To provide clarity
D.
To dismiss the topic
Show solution
Solution
Rhetorical questions are used to engage the reader and provoke thought about the subject matter.
Correct Answer:
A
— To engage the reader
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Q. What is the effect on the angular momentum of a system if an external torque is applied?
A.
It increases
B.
It decreases
C.
It changes
D.
It remains constant
Show solution
Solution
An external torque changes the angular momentum of the system.
Correct Answer:
C
— It changes
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Q. What is the effect on the fringe separation in a double-slit experiment if the distance between the slits and the screen is increased? (2021)
A.
Fringe separation decreases
B.
Fringe separation increases
C.
Fringe separation remains the same
D.
Fringe separation becomes zero
Show solution
Solution
Fringe separation is directly proportional to the distance from the slits to the screen. Increasing this distance increases the fringe separation.
Correct Answer:
B
— Fringe separation increases
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Q. What is the effect on the interference pattern if the wavelength of light used in a double-slit experiment is increased? (2023)
A.
Fringe width decreases
B.
Fringe width increases
C.
Fringe separation remains the same
D.
Fringe visibility decreases
Show solution
Solution
Increasing the wavelength increases the fringe width, as fringe width β is directly proportional to the wavelength.
Correct Answer:
B
— Fringe width increases
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Q. What is the effect on the total current in a circuit if an additional resistor is added in parallel to an existing resistor?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding a resistor in parallel decreases the total resistance, which increases the total current according to Ohm's law.
Correct Answer:
A
— Increases
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Q. What is the effect on the total resistance in a circuit when more resistors are added in series?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding more resistors in series increases the total resistance, as total resistance is the sum of individual resistances.
Correct Answer:
A
— Increases
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Q. What is the effect on the total resistance in a series circuit if one resistor is removed? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Removing a resistor from a series circuit decreases the total resistance since the sum of the remaining resistances is less.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when a resistor is added in parallel to an existing resistor?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Doubles
Show solution
Solution
Adding a resistor in parallel decreases the total resistance of the circuit.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when more resistors are added in parallel?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the resistors
Show solution
Solution
Adding resistors in parallel decreases the total resistance.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when more resistors are added in parallel to a circuit?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Doubles
Show solution
Solution
Adding more resistors in parallel decreases the total resistance of the circuit.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when more resistors are added in series to a circuit?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
In series, the total resistance increases as more resistors are added.
Correct Answer:
B
— It increases
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Q. What is the effect on the total resistance when more resistors are added in series?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the resistors
Show solution
Solution
Total resistance increases when resistors are added in series.
Correct Answer:
A
— Increases
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Q. What is the effect on total resistance when more resistors are added in parallel? (2022)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
Adding resistors in parallel decreases the total resistance.
Correct Answer:
B
— It decreases
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Q. What is the efficiency of a Carnot engine operating between 300 K and 600 K? (2022)
A.
0.5
B.
0.33
C.
0.25
D.
0.67
Show solution
Solution
Efficiency = 1 - (T_c/T_h) = 1 - (300/600) = 0.5.
Correct Answer:
A
— 0.5
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Q. What is the efficiency of a Carnot engine operating between 500 K and 300 K? (2022)
A.
0.4
B.
0.5
C.
0.6
D.
0.7
Show solution
Solution
Efficiency = 1 - (T2/T1) = 1 - (300/500) = 0.4 or 40%.
Correct Answer:
C
— 0.6
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