Q. What happens to the current through the galvanometer when the Wheatstone bridge is unbalanced?
A.
It becomes zero
B.
It increases
C.
It decreases
D.
It becomes infinite
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Solution
When the Wheatstone bridge is unbalanced, there is a non-zero potential difference across the galvanometer, causing current to flow through it.
Correct Answer:
B
— It increases
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is perfectly balanced?
A.
It flows in one direction.
B.
It flows in both directions.
C.
It is zero.
D.
It is maximum.
Show solution
Solution
When the Wheatstone bridge is perfectly balanced, the current through the galvanometer is zero.
Correct Answer:
C
— It is zero.
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Q. What happens to the density of a fluid when it is heated?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the fluid
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Solution
When a fluid is heated, its density typically decreases as the fluid expands.
Correct Answer:
B
— Decreases
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Q. What happens to the density of a gas when it is compressed at constant temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
According to the ideal gas law, compressing a gas at constant temperature increases its density.
Correct Answer:
A
— Increases
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Q. What happens to the density of a material when it is compressed? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
Density increases when a material is compressed, as mass remains constant while volume decreases.
Correct Answer:
B
— It increases
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Q. What happens to the density of a solid when it is subjected to uniform compression? (2020)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the material
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Solution
The density of a solid increases when it is subjected to uniform compression.
Correct Answer:
A
— Increases
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Q. What happens to the diffraction pattern when monochromatic light is replaced with white light?
A.
It becomes monochromatic
B.
It disappears
C.
It becomes colored
D.
It remains unchanged
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Solution
Replacing monochromatic light with white light results in a colored diffraction pattern due to the different wavelengths.
Correct Answer:
C
— It becomes colored
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Q. What happens to the diffraction pattern when the distance between the slits in a double-slit experiment is increased?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe pattern disappears
D.
Fringe intensity increases
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Solution
Increasing the distance between the slits decreases the fringe width, as fringe width is inversely proportional to the slit separation.
Correct Answer:
B
— Fringe width decreases
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Q. What happens to the diffraction pattern when the distance to the screen is increased?
A.
Fringe width decreases
B.
Fringe width increases
C.
Fringe intensity increases
D.
Fringe intensity decreases
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Solution
Increasing the distance to the screen results in an increase in fringe width in the diffraction pattern.
Correct Answer:
B
— Fringe width increases
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Q. What happens to the diffraction pattern when the slit width is decreased?
A.
Pattern becomes wider
B.
Pattern becomes narrower
C.
No change in pattern
D.
Pattern disappears
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Solution
Decreasing the slit width increases the diffraction angle, causing the diffraction pattern to become wider.
Correct Answer:
A
— Pattern becomes wider
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Q. What happens to the electric field if the charge is tripled while keeping the distance constant?
A.
It triples
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
The electric field is directly proportional to the charge. Tripling the charge will triple the electric field.
Correct Answer:
A
— It triples
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Q. What happens to the electric field inside a conductor in electrostatic equilibrium?
A.
It is zero
B.
It is constant
C.
It varies linearly
D.
It is maximum at the center
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Solution
In electrostatic equilibrium, the electric field inside a conductor is zero.
Correct Answer:
A
— It is zero
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Q. What happens to the electric field inside a conductor when it is in electrostatic equilibrium?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It remains constant
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Solution
In electrostatic equilibrium, the electric field inside a conductor is zero.
Correct Answer:
C
— It becomes zero
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Q. What happens to the electric field inside a conductor when it reaches electrostatic equilibrium?
A.
It becomes uniform
B.
It becomes zero
C.
It increases
D.
It decreases
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Solution
In electrostatic equilibrium, the electric field inside a conductor is zero.
Correct Answer:
B
— It becomes zero
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Q. What happens to the electric field strength if the distance from a point charge is tripled?
A.
It becomes one-third
B.
It becomes one-ninth
C.
It becomes three times
D.
It remains the same
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Solution
The electric field strength E ∝ 1/r², so if distance is tripled, the field strength becomes 1/9 of the original.
Correct Answer:
B
— It becomes one-ninth
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Q. What happens to the electric field when the charge is doubled while keeping the distance constant? (2023)
A.
It doubles
B.
It halves
C.
It quadruples
D.
It remains the same
Show solution
Solution
The electric field E is directly proportional to the charge, so if the charge is doubled, the electric field also doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the electric potential as you move away from a positive charge?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes negative
Show solution
Solution
The electric potential decreases as you move away from a positive charge.
Correct Answer:
B
— Decreases
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Q. What happens to the electric potential energy of a charge when it moves against an electric field?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
When a charge moves against an electric field, its electric potential energy increases.
Correct Answer:
A
— It increases
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Q. What happens to the electric potential energy of a system of charges when they are brought closer together?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The electric potential energy of a system of charges decreases when they are brought closer together, especially if they are of opposite signs.
Correct Answer:
B
— Decreases
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Q. What happens to the electric potential energy when a capacitor is disconnected from a battery and the plates are moved further apart? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
When a capacitor is disconnected from a battery and the plates are moved further apart, the electric potential energy increases because the capacitance decreases while the charge remains constant.
Correct Answer:
A
— Increases
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Q. What happens to the electric potential energy when two like charges are brought closer together?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The electric potential energy increases as like charges repel each other.
Correct Answer:
A
— Increases
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Q. What happens to the energy stored in a capacitor if the voltage across it is doubled?
A.
It doubles
B.
It quadruples
C.
It remains the same
D.
It halves
Show solution
Solution
The energy stored in a capacitor is given by U = 1/2 C V². If the voltage is doubled, the energy increases by a factor of four.
Correct Answer:
B
— It quadruples
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Q. What happens to the entropy of a system when it undergoes a reversible isothermal expansion?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the gas
Show solution
Solution
During a reversible isothermal expansion, the entropy of the system increases as the gas expands and does work on the surroundings.
Correct Answer:
A
— Increases
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Q. What happens to the entropy of a system when it undergoes a reversible process?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It can either increase or decrease
Show solution
Solution
In a reversible process, the total entropy of the system and surroundings remains constant.
Correct Answer:
B
— It remains constant
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Q. What happens to the entropy of a system when it undergoes a spontaneous process?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
Show solution
Solution
In a spontaneous process, the entropy of a system increases.
Correct Answer:
C
— It increases
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Q. What happens to the entropy of a system when it undergoes an irreversible process?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
Show solution
Solution
The entropy of a system increases when it undergoes an irreversible process.
Correct Answer:
C
— It increases
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Q. What happens to the entropy of an isolated system?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It can either increase or decrease
Show solution
Solution
The second law of thermodynamics states that the entropy of an isolated system always increases.
Correct Answer:
C
— It increases
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Q. What happens to the entropy of an isolated system? (2020) 2020
A.
It decreases
B.
It remains constant
C.
It increases
D.
It can either increase or decrease
Show solution
Solution
According to the second law of thermodynamics, the entropy of an isolated system always increases over time.
Correct Answer:
C
— It increases
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Q. What happens to the equilibrium constant if the reaction is reversed?
A.
K remains the same
B.
K is doubled
C.
K is inverted
D.
K is halved
Show solution
Solution
When a reaction is reversed, the equilibrium constant for the reverse reaction is the reciprocal of the equilibrium constant for the forward reaction.
Correct Answer:
C
— K is inverted
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Q. What happens to the equilibrium constant when a reaction is multiplied by a factor? (2023)
A.
It remains the same
B.
It is multiplied by the factor
C.
It is raised to the power of the factor
D.
It is divided by the factor
Show solution
Solution
When a balanced equation is multiplied by a factor, the equilibrium constant is raised to the power of that factor.
Correct Answer:
C
— It is raised to the power of the factor
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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!
