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!

Engineering Entrance Medical Entrance

Q. What is the net gain of ATP molecules from one molecule of glucose during aerobic respiration? (2023)

A. 2
B. 18
C. 30-32
D. 36

Solution

The net gain of ATP molecules from one molecule of glucose during aerobic respiration is approximately 30-32 ATP.

Correct Answer: C — 30-32

Q. What is the normal pH range of human blood? (2019)

A. 6.8 - 7.2
B. 7.35 - 7.45
C. 7.0 - 7.5
D. 7.8 - 8.0

Solution

The normal pH range of human blood is tightly regulated between 7.35 and 7.45, which is essential for proper physiological function.

Correct Answer: B — 7.35 - 7.45

Q. What is the normal pH range of human urine? (2022)

A. 4.5 - 5.5
B. 6.0 - 7.0
C. 7.5 - 8.0
D. 9.0 - 10.0

Solution

The normal pH range of human urine is typically between 6.0 and 7.0, indicating it is slightly acidic.

Correct Answer: B — 6.0 - 7.0

Q. What is the normal respiratory rate for a healthy adult at rest? (2022)

A. 10-12 breaths per minute
B. 12-20 breaths per minute
C. 20-30 breaths per minute
D. 30-40 breaths per minute

Solution

The normal respiratory rate for a healthy adult at rest is typically between 12 to 20 breaths per minute.

Correct Answer: B — 12-20 breaths per minute

Q. What is the normality of a solution containing 3 moles of H2SO4 in 1 liter of solution? (2022) 2022

A. 3 N
B. 6 N
C. 1.5 N
D. 0.5 N

Solution

Normality (N) = n * molarity, where n = number of equivalents. For H2SO4, n = 2. Thus, N = 2 * 3 M = 6 N.

Correct Answer: B — 6 N

Q. What is the number of moles in 10 grams of H2? (2020)

A. 0.5
B. 1
C. 2
D. 0.25

Solution

Molar mass of H2 = 2 g/mol. Number of moles = mass/molar mass = 10 g / 2 g/mol = 5 moles.

Correct Answer: A — 0.5

Q. What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)

A. 5
B. 0.5
C. 1
D. 2

Solution

Molar mass of H2 = 2 g/mol. Number of moles = 10g/2g/mol = 5 moles.

Correct Answer: B — 0.5

Q. What is the number of moles in 250 mL of a 2 M NaCl solution? (2021)

A. 0.5
B. 1
C. 2
D. 0.25

Solution

Moles = Molarity x Volume (L) = 2 M x 0.250 L = 0.5 moles.

Correct Answer: A — 0.5

Q. What is the number of moles in 44 grams of carbon dioxide (CO2)? (2023)

A. 1 mole
B. 2 moles
C. 0.5 moles
D. 0.25 moles

Solution

The molar mass of CO2 is 44 g/mol. Therefore, 44 g of CO2 corresponds to 1 mole.

Correct Answer: A — 1 mole

Q. What is the number of moles in 44 grams of CO2? (2021) 2021

A. 1
B. 2
C. 0.5
D. 0.25

Solution

Molar mass of CO2 = 12 + 16*2 = 44 g/mol. Number of moles = mass/molar mass = 44g/44g/mol = 1 mole.

Correct Answer: A — 1

Q. What is the number of moles in 500 mL of a 2 M NaCl solution? (2023)

A. 1
B. 0.5
C. 2
D. 0.25

Solution

Moles = Molarity x Volume (L) = 2 moles/L x 0.5 L = 1 mole.

Correct Answer: A — 1

Q. What is the osmotic pressure of a 0.5 M NaCl solution at 25°C? (R = 0.0821 L·atm/(K·mol)) (2023)

A. 12.3 atm
B. 6.15 atm
C. 3.07 atm
D. 1.54 atm

Solution

Osmotic pressure (π) = iCRT = 2 * 0.5 * 0.0821 * 298 = 24.5 atm. Therefore, π = 6.15 atm.

Correct Answer: B — 6.15 atm

Q. What is the osmotic pressure of a solution containing 0.1 moles of glucose in 1 liter of solution at 25 °C? (R = 0.0821 L atm/K mol) (2020)

A. 2.06 atm
B. 0.82 atm
C. 1.01 atm
D. 0.25 atm

Solution

Osmotic pressure (π) = nRT/V = (0.1 mol)(0.0821 L atm/K mol)(298 K) = 2.06 atm.

Correct Answer: A — 2.06 atm

Q. What is the osmotic pressure of a solution containing 0.1 moles of glucose in 1 L of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)

A. 2.03 atm
B. 1.96 atm
C. 0.82 atm
D. 0.25 atm

Solution

Osmotic pressure (π) = nRT/V = (0.1 mol)(0.0821 L·atm/(K·mol))(298 K) = 2.03 atm.

Correct Answer: A — 2.03 atm

Q. What is the osmotic pressure of a solution containing 0.1 moles of solute in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)

A. 2.5 atm
B. 0.82 atm
C. 1.0 atm
D. 0.25 atm

Solution

Osmotic pressure (π) = nRT/V = (0.1 moles * 0.0821 * 298) / 1 = 2.5 atm.

Correct Answer: A — 2.5 atm

Q. What is the osmotic pressure of a solution containing 0.5 moles of solute in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2021)

A. 12.3 atm
B. 10.2 atm
C. 8.2 atm
D. 6.1 atm

Solution

Osmotic pressure (π) = nRT/V = (0.5 moles * 0.0821 L·atm/(K·mol) * 298 K) / 1 L = 12.3 atm.

Correct Answer: B — 10.2 atm

Q. What is the osmotic pressure of a solution containing 0.5 moles of solute in 1 liter of solution at 25 °C? (2021)

A. 12.3 atm
B. 24.6 atm
C. 6.1 atm
D. 3.1 atm

Solution

Osmotic pressure (π) = nRT/V = (0.5 moles)(0.0821 L·atm/(K·mol))(298 K) = 12.3 atm.

Correct Answer: B — 24.6 atm

Q. What is the osmotic pressure of a solution containing 2 moles of glucose in 1 liter of solution at 25 °C? (2021)

A. 0.0821 atm
B. 1.0 atm
C. 2.0 atm
D. 4.0 atm

Solution

Osmotic pressure (π) = iCRT = 1 * 2 * 0.0821 * 298 = 4.0 atm (i = 1 for glucose).

Correct Answer: C — 2.0 atm

Q. What is the osmotic pressure of a solution containing 2 moles of glucose in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)

A. 0.82 atm
B. 1.64 atm
C. 2.46 atm
D. 4.92 atm

Solution

Osmotic pressure (π) = nRT/V = (2 moles * 0.0821 L·atm/(K·mol) * 298 K) / 1 L = 4.92 atm.

Correct Answer: B — 1.64 atm

Q. What is the outermost layer of a plant stem called? (2022)

A. Cortex
B. Epidermis
C. Phloem
D. Xylem

Solution

The outermost layer of a plant stem is called the epidermis, which protects the plant from environmental damage.

Correct Answer: B — Epidermis

Q. What is the outermost layer of cells in a plant called? (2023)

A. Cortex
B. Epidermis
C. Phloem
D. Xylem

Solution

The outermost layer of cells in a plant is called the epidermis, which protects the plant from environmental damage.

Correct Answer: B — Epidermis

Q. What is the outermost whorl of a flower called? (2023)

A. Calyx
B. Corolla
C. Androecium
D. Gynoecium

Solution

The outermost whorl of a flower is called the calyx, which is made up of sepals.

Correct Answer: A — Calyx

Q. What is the oxidation state of chlorine in NaClO3? (2022) 2022

A. +1
B. +3
C. +5
D. +7

Solution

In NaClO3, the oxidation state of chlorine is +5. Sodium is +1 and each oxygen is -2, leading to the equation: +1 + x + 3(-2) = 0, solving gives x = +5.

Correct Answer: C — +5

Q. What is the oxidation state of chromium in K2Cr2O7? (2021) 2021

A. +3
B. +6
C. +2
D. +5

Solution

In K2Cr2O7, the total charge from potassium (K) is +2, and oxygen (O) contributes -14. Let the oxidation state of Cr be x. The equation is 2x - 14 + 2 = 0, solving gives x = +6.

Correct Answer: B — +6

Q. What is the oxidation state of nitrogen in NH4+? (2020) 2020

A. -3
B. 0
C. +1
D. +3

Solution

In NH4+, nitrogen has an oxidation state of -3. Each hydrogen is +1, leading to the equation: x + 4(+1) = +1, solving gives x = -3.

Correct Answer: A — -3

Q. What is the oxidation state of nitrogen in NH4Cl? (2023)

A. -3
B. +3
C. +1
D. 0

Solution

In NH4Cl, the oxidation state of nitrogen is -3, as it is bonded to four hydrogens.

Correct Answer: A — -3

Q. What is the oxidation state of phosphorus in phosphoric acid (H3PO4)? (2020) 2020

A. +3
B. +5
C. 0
D. -3

Solution

In H3PO4, phosphorus has an oxidation state of +5.

Correct Answer: B — +5

Q. What is the oxidation state of sulfur in H2SO4? (2021) 2021

A. +6
B. +4
C. +2
D. 0

Solution

In H2SO4, the oxidation state of sulfur is +6. Each hydrogen is +1 and each oxygen is -2, leading to the equation: 2(+1) + x + 4(-2) = 0, solving gives x = +6.

Correct Answer: A — +6

Q. What is the oxidation state of sulfur in H2SO4? (2023) 2023

A. +2
B. +4
C. +6
D. 0

Solution

In H2SO4, the oxidation state of sulfur is +6.

Correct Answer: C — +6

Q. What is the packing efficiency of a body-centered cubic (BCC) structure? (2020)

A. 52%
B. 68%
C. 74%
D. 100%

Solution

The packing efficiency of a body-centered cubic (BCC) structure is approximately 68%.

Correct Answer: B — 68%

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