1. During a phase transition, the temperature of a pure substance
Answer: B. remains constant
Chemistry Class 10 Unit 2: Matter MCQs
28 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers".
Tap an option to check your answer.
2. Internal energy is made up of kinetic energy and
Answer: C. potential energy
3. What happens to the internal energy of a substance during melting?
Answer: A. It increases
4. When energy is added to a solid at its melting point, it increases the
Answer: D. potential energy of the particles
5. The change of a solid directly into a gas is called
Answer: A. sublimation
6. The change of a gas directly into a solid is called
Answer: C. deposition
7. During condensation, the particles in a gas
Answer: D. lose energy and move slower
8. In a heating curve, the horizontal part where a solid melts represents the latent heat of
Answer: B. fusion
9. In a heating curve, the horizontal part where a liquid boils represents the latent heat of
Answer: D. vaporization
10. In the flat regions of a heating curve, the absorbed energy is used to
Answer: A. overcome intermolecular forces
11. Evaporation is a process occurring
Answer: C. at the surface of a liquid at any temperature below the boiling point
12. Boiling occurs
Answer: B. throughout the liquid at a fixed temperature
13. Evaporation causes cooling because the molecules left behind have
Answer: B. lower average kinetic energy
14. Evaporation differs from boiling because evaporation
Answer: A. occurs at the surface of a liquid at any temperature
15. Increasing the external pressure on a liquid
Answer: C. increases its boiling point
16. A pressure cooker cooks food faster because it
Answer: D. raises the boiling point of water
17. Boyle's law states that at constant temperature the volume of a fixed amount of gas is
Answer: D. inversely proportional to its pressure
18. Boyle's law is expressed as
Answer: C. PV = constant
19. Charles's law states that at constant pressure the volume of a fixed amount of gas is
Answer: A. directly proportional to its absolute temperature
20. Charles's law is expressed as
Answer: B. V/T = constant
21. Avogadro's law states that at constant temperature and pressure the volume of a gas is
Answer: B. directly proportional to the number of moles
22. Avogadro's law is expressed as
Answer: C. V/n = constant
23. Graham's law states that the rate of diffusion is
Answer: A. inversely proportional to the square root of the molar mass
24. Lighter gas molecules diffuse
Answer: D. faster than heavier ones
25. Which factors affect the rate of diffusion of gases?
Answer: A. Molecular mass and temperature
26. Sublimation is the process in which a solid changes
Answer: C. directly into vapour without passing through the liquid state
27. Which of the following easily undergoes sublimation?
Answer: D. Naphthalene
28. The diffusion of medicine in the body is important because it
Answer: B. ensures the medicine reaches all parts of the body
About Chemistry Class 10 Unit 2 MCQs (Federal Board)
These 28 Chemistry MCQs cover Class 10 Unit 2: Matter of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. You can also read the Matter notes for this chapter. Download the Matter MCQs as a PDF using the button at the top of this page.