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. How many grams of KCl are needed to prepare 250 mL of a 2 M solution? (2023)
A.
37.25 g
B.
50 g
C.
75 g
D.
25 g
Show solution
Solution
Molar mass of KCl = 74.55 g/mol. Grams = moles × molar mass = 0.5 moles × 74.55 g/mol = 37.25 g.
Correct Answer:
A
— 37.25 g
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Q. How many grams of KCl are needed to prepare 250 mL of a 2 M solution? (Molar mass of KCl = 74.5 g/mol) (2023)
A.
37.25 g
B.
74.5 g
C.
18.625 g
D.
9.25 g
Show solution
Solution
Grams = moles × molar mass = (2 moles/L × 0.25 L) × 74.5 g/mol = 37.25 g.
Correct Answer:
A
— 37.25 g
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Q. How many liters of a 0.5 M NaOH solution are needed to obtain 1 mole of NaOH? (2023)
A.
1 L
B.
2 L
C.
0.5 L
D.
0.25 L
Show solution
Solution
Volume = moles / molarity = 1 mole / 0.5 M = 2 L.
Correct Answer:
A
— 1 L
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Q. How many liters of a 0.5 M solution contain 2 moles of solute? (2023)
A.
2 L
B.
4 L
C.
1 L
D.
0.5 L
Show solution
Solution
Volume = moles / molarity = 2 moles / 0.5 M = 4 L
Correct Answer:
B
— 4 L
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Q. How many liters of a 3 M solution can be made from 6 moles of solute? (2023)
A.
1 L
B.
2 L
C.
3 L
D.
4 L
Show solution
Solution
Volume = moles / molarity = 6 moles / 3 M = 2 L.
Correct Answer:
B
— 2 L
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Q. How many molecules are in 0.1 moles of oxygen gas (O2)? (2021)
A.
6.022 x 10^22
B.
6.022 x 10^23
C.
1.2044 x 10^23
D.
3.011 x 10^23
Show solution
Solution
Number of molecules = moles x Avogadro's number = 0.1 moles x 6.022 x 10^23 molecules/mole = 6.022 x 10^22 molecules.
Correct Answer:
A
— 6.022 x 10^22
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Q. How many molecules are in 0.25 moles of oxygen gas (O2)? (2022)
A.
3.011 x 10^23
B.
6.022 x 10^22
C.
1.2044 x 10^23
D.
1.5055 x 10^23
Show solution
Solution
Number of molecules = moles x Avogadro's number = 0.25 moles x 6.022 x 10^23 molecules/mole = 1.5055 x 10^23 molecules.
Correct Answer:
B
— 6.022 x 10^22
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Q. How many molecules are present in 2 moles of water (H2O)? (2022) 2022
A.
6.022 x 10^23
B.
1.2044 x 10^24
C.
3.011 x 10^23
D.
1.2044 x 10^23
Show solution
Solution
Number of molecules = moles x Avogadro's number = 2 moles x 6.022 x 10^23 molecules/mole = 1.2044 x 10^24 molecules.
Correct Answer:
B
— 1.2044 x 10^24
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Q. How many moles are in 100 grams of NaOH? (2022)
A.
2.5
B.
1.25
C.
0.5
D.
3
Show solution
Solution
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Number of moles = mass/molar mass = 100 g / 40 g/mol = 2.5 moles.
Correct Answer:
B
— 1.25
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Q. How many moles are in 32 grams of O2? (2021)
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Solution
Molar mass of O2 = 16*2 = 32 g/mol. Number of moles = mass/molar mass = 32g/32g/mol = 1 mole.
Correct Answer:
A
— 1
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Q. How many moles of solute are present in 500 mL of a 0.2 M solution? (2021) 2021
A.
0.1 moles
B.
0.5 moles
C.
0.2 moles
D.
0.25 moles
Show solution
Solution
Moles = Molarity * Volume (L) = 0.2 M * 0.5 L = 0.1 moles.
Correct Answer:
A
— 0.1 moles
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Q. How many orbitals are present in the d-subshell? (2023)
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Solution
The d-subshell has 5 orbitals.
Correct Answer:
C
— 5
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Q. How many orbitals are present in the p subshell? (2023)
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Solution
The p subshell has 3 orbitals (px, py, pz).
Correct Answer:
C
— 3
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Q. How many ways can 2 boys and 2 girls be selected from 5 boys and 5 girls? (2020)
A.
100
B.
150
C.
200
D.
300
Show solution
Solution
The number of ways to select 2 boys from 5 is C(5, 2) and 2 girls from 5 is C(5, 2). Total = C(5, 2) * C(5, 2) = 10 * 10 = 100.
Correct Answer:
B
— 150
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Q. How many ways can 2 boys and 3 girls be selected from 5 boys and 6 girls?
A.
100
B.
150
C.
200
D.
250
Show solution
Solution
The number of ways is 5C2 * 6C3 = 10 * 20 = 200.
Correct Answer:
B
— 150
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Q. How many ways can 2 boys and 3 girls be selected from 5 boys and 7 girls? (2020)
A.
210
B.
300
C.
350
D.
400
Show solution
Solution
The number of ways is 5C2 * 7C3 = 10 * 35 = 350.
Correct Answer:
C
— 350
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Q. How many ways can 2 boys and 3 girls be selected from 8 boys and 6 girls?
A.
336
B.
280
C.
420
D.
180
Show solution
Solution
The number of ways is 8C2 * 6C3 = 28 * 20 = 560.
Correct Answer:
A
— 336
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Q. How many ways can 2 boys and 3 girls be selected from a group of 5 boys and 7 girls? (2018)
A.
210
B.
300
C.
150
D.
100
Show solution
Solution
The number of ways to select 2 boys from 5 is 5C2 and 3 girls from 7 is 7C3. Total = 5C2 * 7C3 = 10 * 35 = 350.
Correct Answer:
A
— 210
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Q. How many ways can 2 out of 5 students be selected?
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Solution
The number of ways to choose 2 from 5 is C(5,2) = 10.
Correct Answer:
A
— 10
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Q. How many ways can 2 students be selected from a group of 5? (2019)
Show solution
Solution
The number of ways to select 2 students from 5 is given by 5C2 = 10.
Correct Answer:
A
— 10
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Q. How many ways can 2 students be selected from a group of 8? (2015)
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Solution
The number of ways to select 2 from 8 is C(8, 2) = 28.
Correct Answer:
A
— 28
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Q. How many ways can 3 books be selected from a shelf of 10 books? (2022)
A.
120
B.
210
C.
100
D.
30
Show solution
Solution
The number of ways to select 3 books from 10 is given by 10C3 = 120.
Correct Answer:
B
— 210
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Q. How many ways can 3 boys and 2 girls be seated in a row?
A.
30
B.
60
C.
120
D.
180
Show solution
Solution
The number of ways to arrange 5 people is 5! = 120.
Correct Answer:
C
— 120
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Q. How many ways can 3 different books be chosen from a set of 7?
Show solution
Solution
The number of ways to choose 3 from 7 is C(7, 3) = 35.
Correct Answer:
A
— 35
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Q. How many ways can 3 different colored balls be arranged in a row? (2022)
Show solution
Solution
The number of arrangements of 3 distinct balls is 3! = 6.
Correct Answer:
A
— 6
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Q. How many ways can 3 different gifts be given to 5 children if each child can receive more than one gift? (2022)
A.
125
B.
243
C.
60
D.
30
Show solution
Solution
Each gift can go to any of the 5 children, so the total ways = 5^3 = 125.
Correct Answer:
B
— 243
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Q. How many ways can 3 different trophies be awarded to 5 students? (2022)
A.
60
B.
100
C.
120
D.
30
Show solution
Solution
The number of ways to award 3 trophies to 5 students is given by P(5,3) = 5! / (5-3)! = 60.
Correct Answer:
C
— 120
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Q. How many ways can 3 out of 8 different colored balls be chosen? (2022)
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Solution
The number of ways to choose 3 balls from 8 is given by 8C3 = 56.
Correct Answer:
A
— 56
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Q. How many ways can 3 prizes be awarded to 10 students if no student can win more than one prize?
A.
720
B.
1000
C.
1200
D.
100
Show solution
Solution
The number of ways to award 3 prizes is P(10, 3) = 720.
Correct Answer:
A
— 720
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Q. How many ways can 3 red balls and 2 blue balls be arranged in a line? (2016)
Show solution
Solution
The number of arrangements is 5! / (3! * 2!) = 10.
Correct Answer:
D
— 20
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