Undergraduate Exam Prep Resources for Competitive Exams

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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!

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Q. What happens to the magnetic field strength inside a solenoid if the current through it is doubled? (2021)

A. It remains the same
B. It doubles
C. It quadruples
D. It halves

Solution

The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, if the current is doubled, the magnetic field strength also doubles.

Correct Answer: B — It doubles

Q. What happens to the magnetic field strength inside a solenoid if the number of turns per unit length is increased? (2023)

A. It decreases
B. It increases
C. It remains the same
D. It becomes zero

Solution

The magnetic field strength inside a solenoid is directly proportional to the number of turns per unit length. Therefore, if the number of turns per unit length is increased, the magnetic field strength also increases.

Correct Answer: B — It increases

Q. What happens to the magnetic field strength inside a solenoid if the number of turns is increased? (2023)

A. It decreases
B. It remains the same
C. It increases
D. It becomes zero

Solution

The magnetic field strength inside a solenoid increases with the number of turns, as it is directly proportional to the number of turns per unit length.

Correct Answer: C — It increases

Q. What happens to the magnetic field when the current in a solenoid is reversed? (2023)

A. It remains the same
B. It disappears
C. It reverses direction
D. It doubles

Solution

When the current in a solenoid is reversed, the direction of the magnetic field also reverses.

Correct Answer: C — It reverses direction

Q. What happens to the magnetic field when the current in a wire is reversed? (2023)

A. It remains the same
B. It doubles
C. It reverses direction
D. It disappears

Solution

When the current in a wire is reversed, the direction of the magnetic field also reverses.

Correct Answer: C — It reverses direction

Q. What happens to the magnetic field when the direction of current in a wire is reversed? (2023)

A. The magnetic field remains unchanged
B. The magnetic field direction reverses
C. The magnetic field strength increases
D. The magnetic field strength decreases

Solution

Reversing the direction of current in a wire reverses the direction of the magnetic field around it.

Correct Answer: B — The magnetic field direction reverses

Q. What happens to the magnetic field when the distance from a long straight conductor is doubled? (2023)

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

The magnetic field around a long straight conductor decreases with distance. Specifically, it is inversely proportional to the distance from the conductor.

Correct Answer: B — It halves

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

Solution

As the temperature increases, the kinetic energy of gas particles increases, causing them to move faster.

Correct Answer: B — They move faster

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.

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.

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

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

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

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

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

Solution

According to Boyle's Law, if the volume decreases and temperature is constant, the pressure increases.

Correct Answer: A — Increases

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

Solution

The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.

Correct Answer: B — Decreases

Q. What happens to the resistance of a semiconductor as temperature increases? (2021)

A. Increases
B. Decreases
C. Remains constant
D. Becomes infinite

Solution

The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.

Correct Answer: B — Decreases

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

Solution

The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.

Correct Answer: B — Decreases

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

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

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

Solution

The speed of light decreases when it passes from a less dense medium (air) to a denser medium (water).

Correct Answer: B — Decreases

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

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

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

Solution

In a parallel circuit, if one branch is disconnected, the total current decreases.

Correct Answer: B — Total current decreases

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

Solution

Removing a branch in a parallel circuit decreases the total current.

Correct Answer: B — Decreases

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

Solution

In a parallel circuit, adding more branches increases the total current.

Correct Answer: B — It increases

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

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

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

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

Q. What happens to the volume of a gas when its temperature increases at constant pressure? (2020)

A. Volume decreases
B. Volume remains constant
C. Volume increases
D. Volume fluctuates

Solution

According to Charles's Law, the volume of a gas increases with an increase in temperature at constant pressure.

Correct Answer: C — Volume increases

Q. What happens to the volume of a material when it is subjected to uniform pressure? (2019)

A. It increases
B. It decreases
C. It remains the same
D. It depends on the material

Solution

Uniform pressure typically causes a decrease in volume, known as compression.

Correct Answer: B — It decreases

Q. What happens to the volume of a solid when it is subjected to uniform pressure? (2019)

A. It increases
B. It decreases
C. It remains the same
D. It depends on the material

Solution

The volume of a solid generally decreases when subjected to uniform pressure, as per the bulk modulus.

Correct Answer: B — It decreases

Q. What hormone is primarily responsible for regulating blood glucose levels? (2020)

A. Insulin
B. Glucagon
C. Cortisol
D. Adrenaline

Solution

Insulin is the hormone produced by the pancreas that lowers blood glucose levels by facilitating the uptake of glucose into cells.

Correct Answer: A — Insulin

Q. What hormone is primarily responsible for regulating blood sugar levels? (2020)

A. Insulin
B. Glucagon
C. Adrenaline
D. Cortisol

Solution

Insulin is the hormone produced by the pancreas that lowers blood sugar levels by facilitating the uptake of glucose into cells.

Correct Answer: A — Insulin

Q. What is 100 - (25 × 3)? (2022)

A. 25
B. 50
C. 75
D. 70

Solution

25 × 3 = 75, then 100 - 75 = 25.

Correct Answer: C — 75

Q. What is 100 ÷ 4 + 25? (2018)

A. 50
B. 75
C. 25
D. 100

Solution

100 ÷ 4 = 25, then 25 + 25 = 50.

Correct Answer: B — 75

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