Q. What happens to the resistance of a wire if its diameter is halved while keeping the length constant?
A.
It doubles
B.
It halves
C.
It quadruples
D.
It remains the same
Show solution
Solution
Resistance R is inversely proportional to the area; halving the diameter quarters the area, thus quadrupling the resistance.
Correct Answer:
C
— It quadruples
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Q. What happens to the resistivity of a superconductor as it approaches absolute zero?
A.
Increases
B.
Decreases
C.
Becomes infinite
D.
Becomes zero
Show solution
Solution
The resistivity of a superconductor approaches zero as it reaches absolute zero.
Correct Answer:
D
— Becomes zero
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Q. What happens to the resistivity of a superconductor as it transitions to the superconducting state?
A.
Increases
B.
Decreases
C.
Becomes zero
D.
Remains constant
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Solution
In the superconducting state, the resistivity of a superconductor becomes zero.
Correct Answer:
C
— Becomes zero
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Q. What happens to the sensitivity of a Wheatstone bridge if the resistances are made equal?
A.
Sensitivity increases
B.
Sensitivity decreases
C.
Sensitivity remains the same
D.
Sensitivity becomes infinite
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Solution
If the resistances are made equal, the sensitivity of the Wheatstone bridge becomes infinite, as even a small change will cause a large deflection.
Correct Answer:
D
— Sensitivity becomes infinite
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Q. What happens to the shear modulus if the shear stress is doubled while keeping the shear strain constant? (2019)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Shear modulus (G) is defined as shear stress divided by shear strain. If shear strain is constant, doubling shear stress does not change G.
Correct Answer:
C
— It remains the same
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Q. What happens to the sound level when the intensity of sound is increased by a factor of 10?
A.
It increases by 10 dB
B.
It increases by 20 dB
C.
It increases by 30 dB
D.
It remains the same
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Solution
An increase in intensity by a factor of 10 results in an increase of 10 dB, but the sound level increases by 20 dB.
Correct Answer:
B
— It increases by 20 dB
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Q. What happens to the speed of light as it passes from air into a denser medium like glass?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
The speed of light decreases when it passes from a less dense medium (air) to a denser medium (glass) due to the change in refractive index.
Correct Answer:
B
— It decreases
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Q. What happens to the speed of light as it passes from air into water? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The speed of light decreases when it passes from a less dense medium (air) to a denser medium (water).
Correct Answer:
B
— Decreases
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Q. What happens to the surface tension of a liquid when a surfactant is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Surfactants lower the surface tension of liquids by disrupting cohesive forces between molecules.
Correct Answer:
B
— Decreases
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Q. What happens to the surface tension of water as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The surface tension of water decreases as temperature increases.
Correct Answer:
B
— Decreases
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Q. What happens to the surface tension of water when a small amount of soap is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Adding soap decreases the surface tension of water because soap molecules disrupt the cohesive forces between water molecules.
Correct Answer:
B
— Decreases
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Q. What happens to the surface tension of water when a surfactant is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding a surfactant decreases the surface tension of water by disrupting the cohesive forces between water molecules.
Correct Answer:
B
— Decreases
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Q. What happens to the surface tension of water when soap is added?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding soap to water decreases its surface tension because soap molecules disrupt the cohesive forces between water molecules.
Correct Answer:
B
— Decreases
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Q. What happens to the surface tension of water when temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
The surface tension of water decreases with an increase in temperature.
Correct Answer:
B
— Decreases
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Q. What happens to the temperature of a gas during an isothermal expansion? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies with pressure
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Solution
During an isothermal expansion, the temperature of the gas remains constant as the system absorbs heat to do work.
Correct Answer:
C
— Remains constant
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Q. What happens to the temperature of a gas when it expands adiabatically?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It depends on the gas
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Solution
During adiabatic expansion, a gas does work on its surroundings, which results in a decrease in temperature.
Correct Answer:
B
— It decreases
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Q. What happens to the temperature of a substance during a phase change?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It fluctuates
Show solution
Solution
During a phase change, the temperature of a substance remains constant while heat is added or removed.
Correct Answer:
C
— It remains constant
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Q. What happens to the thermal energy of a substance when it undergoes a phase change?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
Show solution
Solution
During a phase change, the thermal energy remains constant as the energy is used to change the state rather than increase the temperature.
Correct Answer:
C
— It remains constant
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Q. What happens to the total current in a parallel circuit if more branches are added? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
In a parallel circuit, adding more branches increases the total current because each branch provides an additional path for current to flow.
Correct Answer:
A
— Increases
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Q. What happens to the total current in a parallel circuit if one branch is disconnected? (2023)
A.
Total current increases
B.
Total current decreases
C.
Total current remains the same
D.
Total current becomes zero
Show solution
Solution
In a parallel circuit, if one branch is disconnected, the total current decreases.
Correct Answer:
B
— Total current decreases
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Q. What happens to the total current in a parallel circuit if one branch is removed? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the branch
Show solution
Solution
Removing a branch in a parallel circuit decreases the total current.
Correct Answer:
B
— Decreases
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Q. What happens to the total current in a parallel circuit if one of the branches is disconnected?
A.
Total current increases
B.
Total current decreases
C.
Total current remains the same
D.
Total current becomes zero
Show solution
Solution
If one branch is disconnected, the total current decreases because there is less path for the current to flow.
Correct Answer:
B
— Total current decreases
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Q. What happens to the total current in a parallel circuit when more branches are added? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
In a parallel circuit, adding more branches increases the total current.
Correct Answer:
B
— It increases
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Q. What happens to the total current in a parallel RLC circuit at resonance? (2022)
A.
It is maximum
B.
It is minimum
C.
It is zero
D.
It is constant
Show solution
Solution
At resonance in a parallel RLC circuit, the total current is maximum because the impedance is at its minimum.
Correct Answer:
A
— It is maximum
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Q. What happens to the total resistance in a circuit when more resistors are added in series?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
In a series circuit, the total resistance increases as more resistors are added.
Correct Answer:
B
— It increases
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Q. What happens to the total resistance in a parallel circuit if more resistors are added?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the resistors
Show solution
Solution
In a parallel circuit, adding more resistors decreases the total resistance.
Correct Answer:
B
— Decreases
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Q. What happens to the total resistance in a parallel circuit if one of the resistors is removed?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the other resistors
Show solution
Solution
Removing a resistor in parallel increases the total resistance, as there are fewer paths for current.
Correct Answer:
A
— Increases
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Q. What happens to the total resistance in a parallel circuit when more resistors are added? (2019)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes infinite
Show solution
Solution
In a parallel circuit, adding more resistors decreases the total resistance because the total resistance is given by 1/R_total = 1/R1 + 1/R2 + ...
Correct Answer:
B
— It decreases
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Q. What happens to the total resistance in a series circuit if one resistor is removed?
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 total resistance is the sum of all resistors.
Correct Answer:
B
— Decreases
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Q. What happens to the total resistance in a series circuit when more resistors are added?
A.
It decreases.
B.
It remains the same.
C.
It increases.
D.
It becomes zero.
Show solution
Solution
In a series circuit, the total resistance increases as more resistors are added.
Correct Answer:
C
— It increases.
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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!
