Q. What happens to the image formed by a concave mirror when the object is placed at the center of curvature?
A.
The image is virtual and upright.
B.
The image is real and inverted.
C.
The image is real and upright.
D.
The image is virtual and inverted.
Show solution
Solution
When the object is at the center of curvature, the image formed is real, inverted, and of the same size.
Correct Answer:
B
— The image is real and inverted.
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Q. What happens to the image formed by a concave mirror when the object is placed between the focal point and the mirror?
A.
The image is real and inverted.
B.
The image is virtual and upright.
C.
The image is real and upright.
D.
No image is formed.
Show solution
Solution
When the object is placed between the focal point and the mirror, the image formed is virtual and upright.
Correct Answer:
B
— The image is virtual and upright.
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Q. What happens to the image formed by a convex lens when the object is moved closer to the lens than its focal length?
A.
Image disappears
B.
Image becomes real
C.
Image becomes virtual
D.
Image becomes inverted
Show solution
Solution
When the object is within the focal length of a convex lens, the image formed is virtual and upright.
Correct Answer:
C
— Image becomes virtual
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Q. What happens to the image formed by a convex lens when the object is placed at a distance greater than twice the focal length? (2022)
A.
Virtual and erect
B.
Real and inverted
C.
Real and erect
D.
Virtual and inverted
Show solution
Solution
When the object is placed beyond twice the focal length, the image formed is real, inverted, and smaller than the object.
Correct Answer:
B
— Real and inverted
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Q. What happens to the image when an object is moved closer to a convex lens than its focal length? (2019)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
Show solution
Solution
When the object is placed within the focal length of a convex lens, the image formed is virtual and erect.
Correct Answer:
B
— Virtual and erect
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Q. What happens to the image when the object is moved closer to a convex lens than its focal length?
A.
Image disappears
B.
Image becomes real
C.
Image becomes virtual
D.
Image becomes inverted
Show solution
Solution
When the object is within the focal length of a convex lens, the image formed is virtual.
Correct Answer:
C
— Image becomes virtual
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Q. What happens to the induced current if the magnetic field is suddenly removed from a coil? (2022)
A.
It continues to flow
B.
It stops immediately
C.
It increases
D.
It decreases gradually
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Solution
If the magnetic field is suddenly removed, the change in magnetic flux becomes zero, leading to an immediate stop in the induced current.
Correct Answer:
B
— It stops immediately
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Q. What happens to the induced current in a closed loop if the magnetic field through the loop is increasing?
A.
The induced current flows in a direction to oppose the increase
B.
The induced current flows in the same direction as the increase
C.
The induced current becomes zero
D.
The induced current fluctuates
Show solution
Solution
According to Lenz's law, the induced current will flow in a direction that opposes the increase in magnetic flux.
Correct Answer:
A
— The induced current flows in a direction to oppose the increase
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Q. What happens to the induced current in a coil if the magnetic field is suddenly removed?
A.
Induced current continues to flow
B.
Induced current stops immediately
C.
Induced current increases
D.
Induced current decreases gradually
Show solution
Solution
If the magnetic field is suddenly removed, the change in magnetic flux becomes zero, and thus the induced current stops immediately.
Correct Answer:
B
— Induced current stops immediately
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Q. What happens to the induced current when the magnetic field is removed from a closed loop?
A.
It continues to flow indefinitely
B.
It stops immediately
C.
It flows in the opposite direction
D.
It decreases gradually
Show solution
Solution
When the magnetic field is removed from a closed loop, the induced current stops immediately as there is no longer a changing magnetic flux.
Correct Answer:
B
— It stops immediately
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Q. What happens to the induced current when the magnetic field through a loop is increased?
A.
The induced current flows in a direction to oppose the increase
B.
The induced current flows in the same direction as the increase
C.
The induced current becomes zero
D.
The induced current fluctuates
Show solution
Solution
According to Lenz's law, the induced current will flow in a direction that opposes the increase in magnetic flux.
Correct Answer:
A
— The induced current flows in a direction to oppose the increase
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Q. What happens to the induced EMF if the area of the coil is increased while the magnetic field strength remains constant?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
Increasing the area of the coil while keeping the magnetic field strength constant increases the magnetic flux through the coil, which according to Faraday's law increases the induced EMF.
Correct Answer:
A
— It increases
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Q. What happens to the induced EMF if the area of the loop in a uniform magnetic field is doubled while keeping the magnetic field constant?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It becomes zero
Show solution
Solution
If the area of the loop is doubled, the induced EMF will also double, as it is directly proportional to the area.
Correct Answer:
A
— It doubles
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Q. What happens to the induced EMF if the rate of change of magnetic flux is doubled?
A.
It remains the same
B.
It doubles
C.
It halves
D.
It quadruples
Show solution
Solution
According to Faraday's law, the induced EMF is directly proportional to the rate of change of magnetic flux. Therefore, if the rate is doubled, the induced EMF also doubles.
Correct Answer:
B
— It doubles
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Q. What happens to the induced EMF if the speed of a conductor moving through a magnetic field is doubled?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
If the speed of the conductor is doubled, the rate of change of magnetic flux increases, thus the induced EMF also doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the induced EMF if the speed of the magnet moving through a coil is doubled? (2022)
A.
It remains the same
B.
It doubles
C.
It halves
D.
It quadruples
Show solution
Solution
The induced EMF doubles if the speed of the magnet moving through the coil is doubled.
Correct Answer:
B
— It doubles
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Q. What happens to the induced EMF when the area of a loop in a changing magnetic field is increased?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
According to Faraday's law, if the area of the loop is increased in a changing magnetic field, the induced EMF increases.
Correct Answer:
A
— Increases
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Q. What happens to the induced EMF when the area of a loop in a magnetic field is increased?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the field strength
Show solution
Solution
According to Faraday's law, if the area of the loop is increased in a magnetic field, the induced EMF increases.
Correct Answer:
A
— Increases
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Q. What happens to the induced emf when the rate of change of magnetic flux increases? (2019)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
The induced emf increases when the rate of change of magnetic flux increases, according to Faraday's Law.
Correct Answer:
A
— Increases
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Q. What happens to the intensity of light when it passes through two polarizers aligned at 90 degrees to each other?
A.
It doubles
B.
It halves
C.
It becomes zero
D.
It remains the same
Show solution
Solution
When light passes through two polarizers at 90 degrees to each other, the intensity becomes zero because no light can pass through.
Correct Answer:
C
— It becomes zero
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Q. What happens to the intensity of light when it passes through two polarizers at an angle of 45 degrees?
A.
It is halved
B.
It is quartered
C.
It remains the same
D.
It doubles
Show solution
Solution
The intensity of light passing through two polarizers at an angle of 45 degrees is quartered.
Correct Answer:
B
— It is quartered
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Q. What happens to the interference pattern if one of the slits in a double-slit experiment is covered?
A.
Interference pattern disappears
B.
Pattern becomes brighter
C.
Pattern becomes dimmer
D.
Pattern becomes sharper
Show solution
Solution
Covering one slit eliminates the condition for interference, resulting in a single-slit diffraction pattern instead of an interference pattern.
Correct Answer:
A
— Interference pattern disappears
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Q. What happens to the interference pattern if the two slits in a double-slit experiment are no longer coherent?
A.
The pattern becomes sharper
B.
The pattern disappears
C.
The pattern becomes brighter
D.
The pattern remains unchanged
Show solution
Solution
If the two slits are not coherent, the interference pattern will disappear as the waves will not maintain a constant phase relationship.
Correct Answer:
B
— The pattern disappears
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Q. What happens to the interference pattern if the wavelength of light is increased?
A.
Fringe width decreases
B.
Fringe width increases
C.
Fringe pattern disappears
D.
Fringe width remains the same
Show solution
Solution
Increasing the wavelength increases the fringe width, as fringe width is directly proportional to the wavelength.
Correct Answer:
B
— Fringe width increases
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Q. What happens to the internal energy of a gas when it is allowed to expand freely into a vacuum?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the initial temperature
Show solution
Solution
In free expansion, no work is done and no heat is exchanged, so the internal energy remains constant.
Correct Answer:
C
— Remains constant
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Q. What happens to the internal energy of an ideal gas during an isochoric process?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It can either increase or decrease
Show solution
Solution
In an isochoric process, the volume remains constant, and any heat added to the system increases the internal energy of the gas.
Correct Answer:
A
— It increases
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Q. What happens to the internal energy of an ideal gas during an isothermal expansion? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the amount of gas
Show solution
Solution
During an isothermal expansion of an ideal gas, the internal energy remains constant because the temperature does not change.
Correct Answer:
C
— Remains constant
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Q. What happens to the internal energy of an ideal gas when it is compressed adiabatically?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It depends on the initial temperature
Show solution
Solution
In an adiabatic compression, work is done on the gas, which increases its internal energy.
Correct Answer:
A
— It increases
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Q. What happens to the kinetic energy of emitted electrons if the frequency of incident light is increased beyond the threshold frequency?
A.
It decreases
B.
It remains constant
C.
It increases linearly with frequency
D.
It becomes zero
Show solution
Solution
The kinetic energy of emitted electrons increases linearly with the increase in frequency beyond the threshold frequency.
Correct Answer:
C
— It increases linearly with frequency
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Q. What happens to the kinetic energy of particles as a substance changes from solid to liquid?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It fluctuates
Show solution
Solution
The kinetic energy of particles increases as they gain energy to overcome intermolecular forces during melting.
Correct Answer:
C
— It increases
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Showing 18571 to 18600 of 31669 (1056 Pages)
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!
