Go To Index
Physics For Class IX (Science Group)
UNIT 7: PROPERTIES OF MATTER
Multiple Choice Questions (MCQs) , Fill in the blanks and Concept Map
Section (A) Multiple Choice Questions (MCQs)
Tick mark (✓) the correct answer:
1. An object with particles close together and vibrating describes a _______.
a) Gas
b) Liquid
c) Solid ✓
d) All three
2. A burning candle is an example of ______ state of matter.
a) Gas
b) Liquid
c) Solid
d) All three ✓
3. During which process a gas becomes a liquid ______.
a) Melting
b) Freezing
c) Condensing ✓
d) Boiling
4. A solid can _______.
a) have a fixed shape ✓
b) be easily compressed
c) take a shape of container
d) have freely moving molecules
5. According to kinetic molecular theory, the pressure exerted by a gas is caused by the _______.
a) bombardment of the gas molecules on the walls of the container. ✓
b) collision between gas molecules.
c) large distances between gas molecules.
d) random motion of the gas molecules.
6. If a gas is heated in a sealed cylinder, then _______ increases.
a) pressure inside the container
b) average kinetic energy of the particles
c) temperature of the gas
d) All of them ✓
7. A gas in a container of fixed volume is heated. What happens to the molecules of the gas?
a) They collide less frequently.
b) They expand.
c) They move faster. ✓
d) They move further apart.
8. In a liquid, some energetic molecules break free from the surface even when the liquid is too cold for bubbles to form. What is the name of this process?
a) boiling
b) condensation
c) convection
d) evaporation ✓
9. What happens to the molecules of a gas when the gas changes into a liquid?
a) They move closer and lose energy. ✓
b) They move closer and gain energy.
c) They move apart and lose energy.
d) They move apart and gain energy.
10. A substance has a melting point of –17 °C and a boiling point of 117 °C. In which state does the substance exist at –10 °C and at 110 °C?
| S.NO. | at –10 °C | at 110 °C | Answer |
|---|---|---|---|
| a | Solid | liquid | ✓ |
| b | Solid | gas | - |
| c | liquid | liquid | - |
| d | liquid | gas | - |
11. States of matter are:
(a) two
(b) three ✓
(c) five
(d) six
12. Liquid state of matter has:
(a) fixed shape & fixed volume
(b) not fixed shape and fixed volume ✓
(c) not fixed shape & not fixed volume
(d) All of them
13. Which states of matter are incompressible?
(a) Solid & Liquid ✓
(b) Solid & Gas
(c) Liquid & Gas
(d) Solid, Liquid & Gas
14. Which state of matter has low density?
(a) Solid
(b) Liquid
(c) Gas ✓
(d) None of these
15. It can change the state of matter.
(a) Addition of certain amount of energy
(b) Removal of certain amount of energy
(c) Both 'a' & 'b' ✓
(d) None of them
16. The term 'Boiling' means:
(a) conversion from solid to liquid
(b) conversion from liquid to gas ✓
(c) conversion from gas to liquid
(d) conversion from solid to gas
17. Evaporation is process by which a liquid becomes a gas at temperature:
(a) at 100 °C
(b) equal to the boiling point of the liquid
(c) above the boiling point of the liquid
(d) below boiling point of the liquid ✓
18. Drying of wet clothes and drying of wet floor are the examples of:
(a) freezing
(b) melting
(c) condensation
(d) evaporation ✓
19. Conversion of matter between three states involves:
(a) physical changes ✓
(b) chemical changes
(c) Both 'a' & 'b'
(d) None of them
20. Matter is made up of tiny particles called:
(a) atoms ✓
(b) molecules
(c) ions
(d) cells
21. In 1827, the evidence of molecular motion first discovered by:
(a) Newton
(b) Einstein
(c) Robert Brown ✓
(d) Kepler
22. A group of atoms is called:
(a) element
(b) molecule ✓
(c) ion
(d) cell
23. The molecules of the following state of matter are usually arranged in a regular pattern called lattice:
(a) Solids ✓
(b) Liquids
(c) Gases
(d) All of them
24. Which state of matter has the highest densities?
(a) Solids ✓
(b) Liquids
(c) Gases
(d) All of them
25. In which state of matter, molecules are found in clusters?
(a) Solids
(b) Liquids ✓
(c) Gases
(d) None of them
26. In which state of matter, particles are very far apart?
(a) Solids
(b) Liquids
(c) Gases ✓
(d) All of them
27. It is responsible for the different states of matter as well as for the physical properties.
(a) Force between the molecules ✓
(b) Energy of the molecules
(c) Size of the molecules
(d) Shape of the molecules
28. According to the Kinetic molecular model, if the molecules have large kinetic energy then:
(a) the forces of attraction between them are very strong
(b) the forces of attraction between them are moderate
(c) the forces of attraction between them are less strong
(d) there will be no (negligible) forces of attraction between them ✓
29. Boiling and melting points of gases are:
(a) very low ✓
(b) low
(c) high
(d) very high
30. The molecules of which state of matter have extremely lowest energies?
(a) Gases
(b) Liquids
(c) Solids ✓
(d) Gases & Liquids
31. It has lowest boiling and melting points as compared to other substances.
(a) Hydrogen
(b) Helium ✓
(c) Mercury
(d) Oxygen
32. It is the only metal that is not solid at room temperature.
(a) Tungsten
(b) Helium
(c) Mercury ✓
(d) Copper
33. A gas molecule moves in a straight line. It changes its direction only when:
(a) it collides with another gas molecule
(b) with the walls of its container
(c) Both 'a' & 'b' ✓
(d) None of these
34. If we compress a gas, its pressure:
(a) becomes zero
(b) remains the same
(c) decreases
(d) increases ✓
35. If a gas is compressed to half of its original volume, its pressure will be:
(a) zero
(b) remains the same
(c) doubled ✓
(d) becomes half
36. If we decrease the pressure of a gas, the volume of the gas will be:
(a) becomes zero
(b) remains the same
(c) decreases
(d) increases ✓
37. It is determined by the average translational kinetic energy of molecules of a gas:
(a) Temperature ✓
(b) Pressure
(c) Density
(d) Volume
38. Boyle's Law can be represented as:
(a) P ∝ 1 / V
(b) V ∝ 1 / P
(c) Both 'a' & 'b' ✓
(d) None of these
FILL IN THE BLANKS:
- Matter exists in three states: solid, liquid and gas.
- The state of a matter can be changed by adding or removing a certain amount of energy.
- The kinetic molecular theory is based upon the arrangement and movement of molecules in a substance.
- The kinetic molecular theory suggests that the molecules in a substance are always in continuous random motion.
- When molecules close to each other, the attractive forces between them become strong.
- The change in force between molecules causes change of state.
- Boyle's law describes the pressure - volume relationship of a gas.
- The pressure and volume of a gas are inversely proportional to each other.’
- Mathematically “P1V1 = P2V2 ” represents Boyle's law.
CONCEPT MAP
Boiling and melting points of some pure substances
| Substance | Melting point (⁰C) | Boiling point (⁰C) |
|---|---|---|
| Helium | -272 | -269 |
| Oxygen | -218 | -183 |
| Nitrogen | -191 | -177 |
| Mercury | -39 | 257 |
| Water | 0 | 100 |
| Iron | 2080 | 3570 |
| Diamond (Carbon) | 4100 | 5400 |
| Tungsten | 3920 | 6500 |
No comments:
Post a Comment