Undergraduate MCQ & Objective Questions
The undergraduate level is a crucial phase in a student's academic journey, especially for those preparing for school and competitive exams. Mastering this stage can significantly enhance your understanding and retention of key concepts. Practicing MCQs and objective questions is essential, as it not only helps in reinforcing knowledge but also boosts your confidence in tackling important questions during exams.
What You Will Practise Here
Fundamental concepts in Mathematics and Science
Key definitions and theories across various subjects
Important formulas and their applications
Diagrams and graphical representations
Critical thinking and problem-solving techniques
Subject-specific MCQs designed for competitive exams
Revision of essential topics for better retention
Exam Relevance
Undergraduate topics are integral to various examinations such as CBSE, State Boards, NEET, and JEE. These subjects often feature a mix of conceptual and application-based questions. Common patterns include multiple-choice questions that assess both theoretical knowledge and practical application, making it vital for students to be well-versed in undergraduate concepts.
Common Mistakes Students Make
Overlooking the importance of understanding concepts rather than rote memorization
Misinterpreting questions due to lack of careful reading
Neglecting to practice numerical problems that require application of formulas
Failing to review mistakes made in previous practice tests
FAQs
Question: What are some effective strategies for solving undergraduate MCQ questions?Answer: Focus on understanding the concepts, practice regularly, and review your answers to learn from mistakes.
Question: How can I improve my speed in answering objective questions?Answer: Time yourself while practicing and gradually increase the number of questions you attempt in a set time.
Start your journey towards mastering undergraduate subjects today! Solve practice MCQs and test your understanding to ensure you are well-prepared for your exams. Your success is just a question away!
Q. What happens to the capacitance of a capacitor if a dielectric material is inserted between its plates? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
Inserting a dielectric material increases the capacitance of the capacitor by a factor equal to the dielectric constant of the material.
Correct Answer:
B
— It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is introduced between its plates? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The capacitance increases when a dielectric material is introduced, as it reduces the electric field between the plates.
Correct Answer:
A
— Increases
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is increased? (2020)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
The capacitance (C) of a parallel plate capacitor is inversely proportional to the distance (d) between the plates. If d increases, C decreases.
Correct Answer:
B
— It decreases
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Q. What happens to the current in a circuit if the voltage is increased while keeping the resistance constant? (2023)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
According to Ohm's Law, if the voltage increases while resistance remains constant, the current will also increase.
Correct Answer:
B
— It increases
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Q. What happens to the current in a circuit if the voltage is increased while the resistance remains constant? (2021)
A.
The current decreases
B.
The current increases
C.
The current remains the same
D.
The current becomes zero
Show solution
Solution
According to Ohm's Law, if the voltage (V) increases while resistance (R) remains constant, the current (I) will increase.
Correct Answer:
B
— The current increases
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Q. What happens to the current in a circuit if the voltage is tripled while the resistance remains constant? (2023)
A.
It triples.
B.
It halves.
C.
It remains the same.
D.
It increases by a factor of nine.
Show solution
Solution
According to Ohm's Law, if the voltage (V) is tripled and resistance (R) remains constant, the current (I) will also triple (I = V/R).
Correct Answer:
A
— It triples.
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Q. What happens to the current in a parallel circuit if one branch is removed? (2019)
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Current stops
Show solution
Solution
In a parallel circuit, removing one branch does not affect the current in the other branches.
Correct Answer:
C
— Current remains the same
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Q. What happens to the current in a series circuit if one of the components fails? (2019)
A.
Current increases
B.
Current decreases
C.
Current stops
D.
Current remains the same
Show solution
Solution
In a series circuit, if one component fails, the current stops flowing through the entire circuit.
Correct Answer:
C
— Current stops
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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
Show solution
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 material when it is compressed? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
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
Show solution
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 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 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 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 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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Q. What happens to the equilibrium position when a catalyst is added to a reaction at equilibrium? (2023)
A.
Shifts to the right
B.
Shifts to the left
C.
No change
D.
Increases Kc
Show solution
Solution
A catalyst speeds up both the forward and reverse reactions equally, thus it does not change the position of equilibrium or the value of Kc.
Correct Answer:
C
— No change
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Q. What happens to the image distance when the object distance is doubled in a concave mirror? (2023)
A.
It remains the same
B.
It doubles
C.
It triples
D.
It halves
Show solution
Solution
In a concave mirror, if the object distance is doubled, the image distance also changes according to the mirror formula, leading to a doubling effect.
Correct Answer:
B
— It doubles
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Q. What happens to the image distance when the object distance is increased in a convex lens? (2022)
A.
Image distance decreases
B.
Image distance increases
C.
Image distance remains the same
D.
Image distance becomes negative
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Solution
As the object distance increases in a convex lens, the image distance also increases, moving further away from the lens.
Correct Answer:
B
— Image distance increases
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Q. What happens to the image distance when the object is moved closer to a concave mirror? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes negative
Show solution
Solution
As the object moves closer to a concave mirror, the image distance increases, and the image becomes larger and more distant.
Correct Answer:
A
— Increases
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Q. What happens to the image distance when the object is moved closer to a convex lens than its focal length? (2023)
A.
Image distance increases
B.
Image distance decreases
C.
Image distance remains the same
D.
Image cannot be formed
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Solution
As the object is moved closer to the focal point of a convex lens, the image distance increases and the image becomes larger and virtual.
Correct Answer:
A
— Image distance increases
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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
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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 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
Show solution
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 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 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 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 magnetic field inside a solenoid when the current is increased? (2020)
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
Show solution
Solution
The magnetic field inside a solenoid is directly proportional to the current. Therefore, if the current is increased, the magnetic field also increases.
Correct Answer:
C
— It increases
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Q. What happens to the magnetic field lines when a magnet is cut into two pieces? (2021)
A.
They disappear
B.
They become weaker
C.
Each piece becomes a magnet with its own field
D.
They merge into one
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Solution
When a magnet is cut into two pieces, each piece becomes a magnet with its own north and south poles, thus maintaining the magnetic field lines.
Correct Answer:
C
— Each piece becomes a magnet with its own field
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Q. What happens to the magnetic field strength inside a long solenoid if the current is doubled? (2021)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
Show solution
Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, doubling the current will double the magnetic field strength.
Correct Answer:
B
— It doubles
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Q. What happens to the magnetic field strength inside a solenoid if the current is increased? (2021)
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
Show solution
Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it.
Correct Answer:
C
— It increases
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