MCQs
1. Matter is classified into:
A. Solid and liquid
B. Pure substance and mixture
C. Atom and molecule
D. Element and gas
2. A pure substance contains:
A. Different particles
B. Same type of particles
C. Only liquids
D. Only gases
3. Which is a mixture?
A. Water
B. Oxygen
C. Air
D. Gold
4. Homogeneous mixture has:
A. Visible components
B. Non-uniform composition
C. Uniform composition
D. Fixed composition
5. Which is a heterogeneous mixture?
A. Air
B. Sugar solution
C. Salt + sand
D. Oxygen gas
6. Components of a mixture can be separated by:
A. Chemical methods
B. Physical methods
C. Nuclear methods
D. Biological methods
7. Which is an element?
A. Water
B. Carbon dioxide
C. Oxygen
D. Sugar
8. Compounds are formed by:
A. Same atoms
B. Different atoms in fixed ratio
C. Random particles
D. Only metals
9. Which of the following is a compound?
A. Hydrogen
B. Oxygen
C. Water
D. Nitrogen
10. Which property does NOT change identity?
A. Chemical property
B. Physical property
C. Combustion
D. Reaction
11. Burning of a substance is a:
A. Physical change
B. Chemical property
C. Mechanical change
D. Nuclear change
12. Density is a:
A. Chemical property
B. Physical property
C. Biological property
D. Nuclear property