Q. What happens to the particles in a gas when the temperature increases? (2023)
A.
They move slower
B.
They move faster
C.
They stay the same
D.
They condense
Show solution
Solution
As the temperature increases, the kinetic energy of gas particles increases, causing them to move faster.
Correct Answer:
B
— They move faster
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Q. What happens to the particles in a solid when it is heated? (2023)
A.
They move closer together.
B.
They vibrate more vigorously.
C.
They become gas.
D.
They stop moving.
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Solution
When a solid is heated, its particles gain energy and vibrate more vigorously, potentially leading to a change in state.
Correct Answer:
B
— They vibrate more vigorously.
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Q. What happens to the particles of a solid when it is heated? (2023)
A.
They move closer together
B.
They vibrate faster
C.
They become a gas
D.
They lose mass
Show solution
Solution
When a solid is heated, its particles gain energy and vibrate faster, which can lead to a change in state.
Correct Answer:
B
— They vibrate faster
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Q. What happens to the particles of a substance when it changes from a solid to a liquid? (2023)
A.
They lose energy
B.
They gain energy
C.
They remain unchanged
D.
They become more ordered
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Solution
When a solid melts into a liquid, the particles gain energy, allowing them to overcome some of the forces holding them in fixed positions.
Correct Answer:
B
— They gain energy
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Q. What happens to the photoelectric current if the voltage across the electrodes is increased?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Increasing the voltage increases the photoelectric current by attracting more emitted electrons.
Correct Answer:
A
— Increases
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Q. What happens to the photoelectric effect if the incident light is below the threshold frequency?
A.
Electrons are emitted
B.
No electrons are emitted
C.
Electrons are emitted with low energy
D.
Electrons are emitted with high energy
Show solution
Solution
If the incident light is below the threshold frequency, no electrons are emitted.
Correct Answer:
B
— No electrons are emitted
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Q. What happens to the photoelectric effect if the metal surface is cooled?
A.
More electrons are emitted
B.
Fewer electrons are emitted
C.
No effect on emission
D.
Electrons are emitted with higher energy
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Solution
Cooling the metal surface reduces the thermal energy of the electrons, making it harder for them to overcome the work function.
Correct Answer:
B
— Fewer electrons are emitted
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Q. What happens to the pitch of a sound as its frequency increases?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes inaudible
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Solution
As the frequency of a sound increases, its pitch also increases.
Correct Answer:
B
— It increases
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Q. What happens to the polarization of light when it passes through a polarizer at an angle of 45 degrees?
A.
It becomes unpolarized
B.
It is completely absorbed
C.
It is partially polarized
D.
It is fully polarized
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Solution
When light passes through a polarizer at an angle of 45 degrees, it becomes partially polarized.
Correct Answer:
C
— It is partially polarized
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Q. What happens to the potential difference across a capacitor when it is fully charged?
A.
It becomes zero
B.
It becomes maximum
C.
It becomes minimum
D.
It fluctuates
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Solution
When a capacitor is fully charged, the potential difference across its plates becomes maximum and remains constant until it is discharged.
Correct Answer:
B
— It becomes maximum
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Q. What happens to the potential difference across a segment of a potentiometer wire if the length of that segment is halved?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It becomes zero
Show solution
Solution
If the length of the segment is halved, the potential difference across that segment also halves, assuming the potential gradient remains constant.
Correct Answer:
B
— It halves
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Q. What happens to the potential difference across a segment of a potentiometer wire if the resistance of the wire is increased?
A.
It increases.
B.
It decreases.
C.
It remains the same.
D.
It becomes zero.
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Solution
Increasing the resistance of the wire decreases the current, which in turn decreases the potential difference across any segment of the wire.
Correct Answer:
C
— It remains the same.
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Q. What happens to the pressure in a fluid as depth increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies randomly
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Solution
In a fluid at rest, pressure increases with depth due to the weight of the fluid above.
Correct Answer:
A
— Increases
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Q. What happens to the pressure of a gas if its temperature is increased while keeping the volume constant?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Pressure becomes zero
Show solution
Solution
According to Gay-Lussac's Law, if the temperature increases at constant volume, the pressure increases.
Correct Answer:
B
— Pressure increases
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Q. What happens to the pressure of a gas if its volume is halved at constant temperature?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
According to Boyle's law, if the volume is halved at constant temperature, the pressure doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the pressure of a gas if its volume is halved while keeping the temperature constant?
A.
Pressure decreases
B.
Pressure remains the same
C.
Pressure doubles
D.
Pressure triples
Show solution
Solution
According to Boyle's law, if the volume of a gas is halved while keeping the temperature constant, the pressure doubles.
Correct Answer:
C
— Pressure doubles
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Q. What happens to the pressure of a gas if the volume is decreased while the temperature remains constant?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Doubles
Show solution
Solution
According to Boyle's Law, if the volume decreases and temperature is constant, the pressure increases.
Correct Answer:
A
— Increases
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Q. What happens to the pressure of a gas if the volume is doubled at constant temperature?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Boyle's Law, if the volume is doubled at constant temperature, the pressure halves.
Correct Answer:
B
— It halves
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Q. What happens to the pressure of a gas if the volume is halved at constant temperature?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
According to Boyle's Law, if the volume is halved, the pressure doubles at constant temperature.
Correct Answer:
A
— It doubles
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Q. What happens to the pressure of a gas if the volume is halved while the temperature remains constant?
A.
Pressure doubles
B.
Pressure halves
C.
Pressure remains the same
D.
Pressure quadruples
Show solution
Solution
According to Boyle's Law, if the volume is halved, the pressure doubles.
Correct Answer:
A
— Pressure doubles
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Q. What happens to the pressure of an ideal gas if its volume is halved while keeping the temperature constant?
A.
Pressure remains the same
B.
Pressure doubles
C.
Pressure halves
D.
Pressure quadruples
Show solution
Solution
According to Boyle's law, for a given amount of gas at constant temperature, pressure is inversely proportional to volume. Halving the volume doubles the pressure.
Correct Answer:
B
— Pressure doubles
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Q. What happens to the rate of heat transfer through a material if its thickness is increased?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the material
Show solution
Solution
The rate of heat transfer decreases with an increase in thickness, as per Fourier's Law.
Correct Answer:
B
— Decreases
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Q. What happens to the reading of a potentiometer if the resistance of the wire increases?
A.
Reading increases
B.
Reading decreases
C.
Reading remains the same
D.
Reading becomes zero
Show solution
Solution
The reading of a potentiometer is independent of the resistance of the wire as long as the potential difference remains constant.
Correct Answer:
C
— Reading remains the same
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Q. What happens to the reading of a potentiometer if the temperature of the wire increases?
A.
It increases.
B.
It decreases.
C.
It remains constant.
D.
It becomes zero.
Show solution
Solution
As temperature increases, the resistance of the wire typically increases, which can affect the potential gradient and thus the reading.
Correct Answer:
B
— It decreases.
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Q. What happens to the reading of a potentiometer if the wire is heated and its resistance increases?
A.
Reading increases
B.
Reading decreases
C.
Reading remains the same
D.
Reading becomes zero
Show solution
Solution
If the wire is heated and its resistance increases, the reading of the potentiometer decreases because the potential gradient will be affected.
Correct Answer:
B
— Reading decreases
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Q. What happens to the reading on a potentiometer when the resistance of the galvanometer is increased?
A.
Reading increases
B.
Reading decreases
C.
Reading remains the same
D.
Reading becomes zero
Show solution
Solution
Increasing the resistance of the galvanometer reduces the current through it, which can lead to a decrease in the reading on the potentiometer.
Correct Answer:
B
— Reading decreases
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Q. What happens to the resistance of a conductor if its temperature increases?
A.
It decreases.
B.
It increases.
C.
It remains the same.
D.
It becomes zero.
Show solution
Solution
For most conductors, resistance increases with an increase in temperature due to increased atomic vibrations.
Correct Answer:
B
— It increases.
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Q. What happens to the resistance of a semiconductor as it is illuminated? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes infinite
Show solution
Solution
The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.
Correct Answer:
B
— Decreases
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Q. What happens to the resistance of a semiconductor as temperature increases? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
Show solution
Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer:
B
— Decreases
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Q. What happens to the resistance of a semiconductor with an increase in temperature? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
Show solution
Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer:
B
— Decreases
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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!
