Here are one mark questions from the chapter Matter In Our Surroundings.

Class 9 Science Chapter 1 One Mark Questions

1. Everything in this universe is made up of ……………………….

Matter

2. Matter has ……………………… and …………………………

Mass and volume

3. What were the five basic elements according to ancient Indian philosophers?

Air, earth, water, fire and sky

4. Matter is made up of …………………………….

Particles

5. When we dissolve salt in water, particles of salt get into …………………………. between particles of matter.

Spaces

6. There is …………………………. between particles of water.

Space

7. What kind of energy is possessed by particles of matter?

Kinetic energy

8. Why do particles of matter possess kinetic energy?

Particles of matter possess kinetic energy because they are continuously moving.

9. When ………………………… increases, the kinetic energy of the particles of matter also increases.

Temperature

10. The intermixing of particles of two different types of matter on their own is called …………………………….

Diffusion

11. What are the three states of matter?

Solid, liquid and gas

12. What are the qualities of solids?

Solids have a definite shape, fixed volume and distinct boundary. They are rigid.

13. What are the properties of liquids?

Liquids have no fixed shape but they have a fixed volume. Liquids flow and change their shape. They are not rigid.

14. How do aquatic animals get oxygen?

Gases such as oxygen and carbon dioxide diffuse and dissolve in water. Aquatic animals use these dissolved gases.

15. Solids, liquids and gases can diffuse into ……………………………

Liquids

16. Liquids diffuse ………………………… than solids.

Faster

17. Give some examples of compressed gas

LPG and CNG

18. What is the full form of LPG?

Liquefied Petroleum Gas

19. What is the full form of CNG?

Compressed Natural Gas

20. Why do gases diffuse faster?

There is large space between particles of gas. Also, they move fast. Hence, gases diffuse faster.

21. Why does gas exert pressure on the walls of the container?

Gas particles move at a high speed and due to this movement, they hit each other and also the walls of the container. The force thus exerted by the particles of the gas per unit area on the walls of the container is the pressure of the gas.

22. What is density?

Density is the mass per unit volume of a substance.

23. Liquids have a lower density than …………………………

Solids

24.  What is melting point?

Melting point is the minimum temperature at which a solid melts to become a liquid at the atmospheric pressure.

25. What is the melting point of ice?

273 Kelvin

26. 273. 15K on the Celsius scale is …………………………

0 degree

27. What is boiling point?

The temperature at which a liquid starts boiling at the atmospheric pressure is its boiling point.

28. What is the boiling point of water?

The boiling point of water is 100 degree Celsius or 373K.

29. How can we change a matter in one state into another state?

We can change a matter in one state into another state by heating it.

30. What is sublimation?

It is the change of state directly from solid to gas without changing into liquid state.

31. What is deposition?

Deposition is the change of gas into solid without changing into liquid.

32. How can gases be liquefied?

By applying pressure and reducing temperature gases can be liquefied.

33. What are the two factors that determine the state of a substance?

Pressure and temperature

34. Give two examples where liquid changes to vapour without heating.

i) Water when left uncovered slowly evaporates.

ii) Wet clothes dry.

35. The change of a liquid to vapour at any temperature below its boiling point is called ……………………….

Evaporation

36. What are the factors increasing the rate of evaporation?

i) An increase of surface area

ii) An increase in temperature

iii) A decrease in humidity

iv) An increase in wind speed

37. ………………………… is the amount of water vapour present in air.

Humidity

38. ……………………………….. is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.

Latent heat of fusion

True or false

1. All particles of matter have the same amount of kinetic energy – False

2. It is not possible to change the state of matter without applying heat or changing pressure – false

3. Deposition is the change of gas into solid without changing into liquid – true

4. There is no limit to the amount of water vapour air can hold – false

5. Evaporation causes cooling – true

See Also

• Class 9 Science Chapter 1 | Matter In Our Surroundings | Characteristics of particles of matter
• CBSE Class 9 Science Chapter 1 | Matter – Its Nature And Behaviour | Study Notes, Questions and Answers
• Class 9 Science Chapter 2 | Is Matter Around Us Pure? | MCQ
• Class 9 Chemistry – Chapter 3 – Atoms And Molecules