Instructions
- Total Questions: 30
- Type: MCQ (Single Correct)
- Level: 0 – Very Basic
- Attempt first, then check answers.
Chemistry studies matter, its properties, and changes.
Matter occupies space and has mass.
Kilogram (kg) is the SI unit of mass.
Mole measures the amount of substance.
A balance is used to measure mass.
1000 grams equals 1 kilogram.
Kelvin (K) is the SI unit of temperature.
This number is called Avogadro’s number.
Water contains two hydrogen atoms and one oxygen atom.
Atomic masses are expressed in atomic mass units.
Mole is used to represent a fixed number of particles.
Formula mass is calculated by adding atomic masses.
One mole always contains Avogadro’s number of particles.
Heat is a form of energy, not matter.
Both notations represent the value 5000.
All non-zero digits are significant.
Leading zeros are not counted.
Mass is a measurable physical quantity.
Carbon dioxide contains one carbon and two oxygen atoms.
Molar mass is expressed in grams per mole.
One mole contains 6.022 × 10²³ particles.
Mole measures the amount of substance.
Cubic meter is the SI unit of volume.
Atom is the basic unit of an element.
Elements are represented using letters.
Methane contains one carbon and four hydrogen atoms.
Compounds have fixed composition.
Na comes from the Latin name Natrium.
Hydrogen molecule contains two atoms.
This chapter builds the foundation of chemistry.
Quiz Results
Answer Key & Explaination
1. Chemistry is the study of:
A. Living organisms
B. Matter and its changes
C. Earth only
D. Stars
Correct Answer: B
Explanation: Chemistry deals with matter, its properties, composition, and changes.
2. Anything that occupies space and has mass is called:
A. Energy
B. Matter
C. Heat
D. Light
Correct Answer: B
Explanation: Matter has mass and occupies space.
3. SI unit of mass is:
A. Gram
B. Kilogram
C. Liter
D. Meter
Correct Answer: B
Explanation: Kilogram (kg) is the SI unit of mass.
4. SI unit of amount of substance is:
A. Mole
B. Gram
C. Liter
D. Kelvin
Correct Answer: A
Explanation: Mole is used to measure quantity of substance.
5. Which instrument measures mass?
A. Thermometer
B. Balance
C. Stopwatch
D. Voltmeter
Correct Answer: B
Explanation: Mass is measured using a balance.
6. 1000 g equals:
A. 10 kg
B. 100 kg
C. 1 kg
D. 0.1 kg
Correct Answer: C
Explanation: 1000 grams = 1 kilogram.
7. Which is a unit of temperature?
A. Kelvin
B. Mole
C. Gram
D. Meter
Correct Answer: A
Explanation: Kelvin (K) is the SI unit of temperature.
8. Number of particles in one mole is:
A. 6.022 × 10²³
B. 3 × 10²³
C. 10²³
D. 1000
Correct Answer: A
Explanation: This is Avogadro’s number.
9. Chemical formula of water is:
A. O₂
B. H₂O
C. CO₂
D. H₂
Correct Answer: B
Explanation: Water contains two hydrogen atoms and one oxygen atom.
10. Atomic mass is measured in:
A. amu
B. kg
C. mol
D. m
Correct Answer: A
Explanation: Atomic masses are expressed in atomic mass units (amu).
11. Mole represents:
A. Mass only
B. Number of particles
C. Volume only
D. Temperature
Correct Answer: B
Explanation: Mole is a counting unit for atoms or molecules.
12. Formula mass of NaCl equals:
A. Atomic masses added
B. Atomic masses multiplied
C. Divided
D. None
Correct Answer: A
Explanation: Formula mass = Na + Cl atomic masses.
13. One mole of oxygen molecules contains:
A. 6.022 × 10²³ molecules
B. 100 molecules
C. 1 molecule
D. 500 molecules
Correct Answer: A
Explanation: Every mole contains Avogadro number of particles.
14. Which is not matter?
A. Air
B. Water
C. Heat
D. Wood
Correct Answer: C
Explanation: Heat is energy, not matter.
15. Scientific notation of 5000 is:
A. 5 × 10³
B. 50 × 10²
C. 0.5 × 10⁴
D. Both A and C
Correct Answer: D
Explanation: Both represent 5000.
16. Number of significant figures in 12.34:
A. 2
B. 3
C. 4
D. 5
Correct Answer: C
Explanation: All non-zero digits are significant.
17. 0.0056 has significant figures:
A. 2
B. 3
C. 4
D. 1
Correct Answer: A
Explanation: Leading zeros are not counted.
18. Which is a physical quantity?
A. Mass
B. Hydrogen
C. Oxygen
D. Carbon
Correct Answer: A
Explanation: Mass can be measured.
19. Formula of carbon dioxide:
A. CO
B. CO₂
C. C₂O
D. O₂
Correct Answer: B
Explanation: One carbon and two oxygen atoms.
20. Molar mass unit:
A. g mol⁻¹
B. kg
C. mol
D. m
Correct Answer: A
Explanation: Molar mass is expressed in gram per mole.
21. One mole of carbon atoms contains:
A. Avogadro number of atoms
B. 100 atoms
C. 10 atoms
D. Infinite atoms
Correct Answer: A
Explanation: One mole always contains 6.022 × 10²³ particles.
22. Which quantity measures amount of matter?
A. Mole
B. Meter
C. Kelvin
D. Second
Correct Answer: A
Explanation: Mole measures quantity of substance.
23. Volume SI unit is:
A. m³
B. cm
C. kg
D. mol
Correct Answer: A
Explanation: Cubic meter is SI unit.
24. Which is smallest?
A. Molecule
B. Atom
C. Compound
D. Mixture
Correct Answer: B
Explanation: Atom is the basic unit of an element.
25. Chemical symbols are represented by:
A. Letters
B. Numbers
C. Units
D. Colors
Correct Answer: A
Explanation: Elements are represented using letters.
26. Formula of methane:
A. CH₄
B. CO₂
C. NH₃
D. H₂O
Correct Answer: A
Explanation: Methane contains one carbon and four hydrogen atoms.
27. Which has fixed composition?
A. Mixture
B. Compound
C. Solution
D. Air
Correct Answer: B
Explanation: Compounds always have fixed ratios.
28. Symbol of sodium:
A. So
B. S
C. Na
D. N
Correct Answer: C
Explanation: Sodium comes from Latin word Natrium.
29. Number of atoms in H₂:
A. 1
B. 2
C. 3
D. 4
Correct Answer: B
Explanation: Hydrogen molecule contains two atoms.
30. First chapter of Class 11 Chemistry is:
A. Structure of Atom
B. Some Basic Concepts of Chemistry
C. Thermodynamics
D. Equilibrium
Correct Answer: B
Explanation: This chapter builds the foundation of chemistry.
Score Guide
- 0–10 → Beginner
- 11–20 → Improving
- 21–26 → Good Foundation
- 27–30 → Ready for Level 1
Chapter 1 some basic concepts of chemistry MCQ Practice Questions For JEE and NEET Exam : Level 1