# Class 9 Science MCQ Chapter 1 Matter in our Surroundings

Class 9 Science MCQ Chapter 1 Matter in our Surroundings, Class 9 Science MCQ Question Answer, Class 9 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 9 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 9 Science MCQ Chapter 1 Matter in our Surroundings Question Answer can be of great value to excel in the examination.

## SCERT Class 9 Science MCQ Chapter 1 Matter in our Surroundings

SCERT Class 9 Science MCQ Chapter 1 Matter in our Surroundings Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 9 Science MCQ Chapter 1 Matter in our Surroundings provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.

Matter in our Surroundings

Chapter – 1

### Multiple Choice Questions & Answers

1. Intermixing of particles of two different types of matter on their own is called –

(a) diffusion

(b) sublimation

(c) evaporation

(d) humidity

Ans. (a) diffusion.

2. A change of state of matter directly from solid to gas without changing into liquid state is called.

(a) humidity

(b) sublimation

(c) fusion

(d) vaporisation

Ans. (b) sublimation.

3. A change of state of matter directly from gas to liquid is called-

(a) solidification

(b) fusion

(c) sublimation

(d) condensation

Ans. (d) condensation.

4. A change of state of matter directly from liquid to gas is called-

(a) fusion

(b) humidity

(c) vaporisation

(d) evaporation

Ans. (c) vaporisation.

5. A change of state of matter directly from solid to liquid is called

(a) fusion

(b) humidity

(c) sublimation

(d) evaporation

Ans. (a) fusion.

6. S.I. unit of temperature is –

(a) Pascal

(b) Newton

(c) Kelvin

(d) Celcius

Ans. (c) Kelvin.

7. Which is of the unit of temperature in the following –

(a) celcius

(b) pascal

(c) Newton

(d) litre

Ans.(a) celcius.

8. Which is the correct form in the following

(a) 0°C = 275k

(b) 0°C = 273k

(c) 0°℃ = 274k

(d) 0°℃=276k

Ans. (b) 0°C = 273k .

9. Dry ice means as

(a) Solid carbon dioxide

(b) liquid carbon dioxide.

(c) Calcium oxide

(d) Magnesium oxide

Ans. (a) Solid carbon dioxide.

10. Change of a liquid into vapours at any temperature below its boiling point is called –

(a) humidity

(b) fusion

(c) condensation

(d) evaporation

Ans. (d) evaporation.

11. The amount of water vapour present in the air is called –

(a) vaporisation

(b) humidity

(c) condensation

(d) vapour state

Ans. (b) humidity.

12. Which of the following temperature water changes to vapour state is?

(a) 273k

(b) 283k

(c) 373k

(d) 383k

Ans. (c) 373k.

13. Which of the following temperature water changes to solid state is?

(a) 573k

(b) 473k

(c) 373k

(d) 273k

Ans. (d) 27 k.

14. If the surface area is increased, then the rate of evaporation is –

(a) decreased

(b) remain same

(c) increased

(d) evaporation do not depend surface area.

Ans. (c) increased.

15. It is common observation that clothes dry faster on a.

(a) rainy day

(b) windy day

(c) cloudy day

(d) fogly day

Ans. (b) windy day.

16. An atmosphere of an area, the humidity is very high, then a cloths dry

(a) faster

(b) slower

(c) familiar

(d) It is not depend on humidity

Ans. (b) slower.

17. The forces of attraction between particles are maximum is

(a) water

(b) iceScience

(c) water vapour

(d) neither maximum nor minimum but equal

Ans. (b) ice.

18. The forces of attraction between particles are minimum in –

(a) sugar

(b) salt

(c) water

(d) oxygen

Ans. (d) oxygen.

19. Evaporation causes for

(a) heating

(b) vaporising

(c) cooling

(d) boiling

Ans. (c) cooling.

20. Physical state of water at 0°C.

(a) water vapour

(b) ice

(c) familiar water

(d) cold water

Ans. (b) ice.

21. The unit of pressure is –

(a) Cubic metre

(b) Newton

(c) Celcius

(d) Pascal

Ans. (d) Pascal.

22. The unit of density is –

(a) Cubic metre

(b) Kilogram per cubic metre

(c) metre

(d) Kelvin

Ans. (b) Kilogram per cubic metre.

23. Some water vapour changes into liquid state, then it particles

(a) gains energy

(b) loses energy

(c) neither loses energy nor gains energy

(d) It depends on atmosphere

Ans. (b) loses energy.

24. Neon signs bulbs consists of

(a) Plasma

(b) Hydrogen gas

(c) Neon gas

(d) Helium gas

Ans. (a) Plasma.

#### Very Short Answer Type Questions

1. How did classified matter by early Indian philosopher?

Ans. “The Panch Tatva” – air, earth, fire, sky and water.

2. What is the full form of CNG?

Ans. CNG-Compressed natural gas.

3. What is the full form of LPG?

Ans.LPG-Liquefied petroleum gas.

4. What do you mean by melting point?

Ans. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

5. What do you mean by dry ice?

Ans. Solid carbon di oxide is called dry ice.

6. What is called evaporation?

Ans. Change of a liquid into vapours at any temperature below its boiling point is called evaporation.

7. Write the three states of water.

Ans. Water can exist three states. Thay are solids (as ice), liquid (as the familiar water) and gas (as water vapour).

8. Convert the following temperatures to the celsius scale.

(a) 283k

(b) 475k

Ans. (a) 283-273 = 10°C

(b) 475-273=202°C

9. Convert the following temperatures to the Kelvin scale.

(a) 35°C

(b) 173°C

Ans.(a) 35+273 = 208k

(b) 173+273 446k

10. What is the physical state of water at-

(a) 40°C

(b) 0°C

(c) 100°C

Ans. (a) as the familiar water.

(b) ice (solid)

(c) water vapour

11. Water at room temperature is liquid. – why?

Ans. A room temperature generally contains 20°C to 40°C. So water is liquid.

12. What is the symbol of Pascal?

Ans. Pa.

13. Arrange the following substances in creasing order of forces of attraction between the particles – oil, salt, oxygen.

Ans. Oxygen <Oil < Salt.

14. Write a physical nature about a solid matter.

Ans. It has definite volume.

15. Write a physical nature of liquid.

Ans. It has no own shape.

16. Write the unit of density.

Ans. Kgm-³.

17. Write the factors behind the rate of evaporation.

Ans. Surface area, temperature, humidity of the liquid.

18. Write the relation between 1 atmosphere and pascal.

Ans. 1 atmosphere = 1.01 × 10³ pascal

19. Write the five states of matter according scientists now.

Ans. Solid, Liquid, Gas, Plasma nad Bose Einstein condensate.

20. When do the form plasma in stars.

Ans. The plasma is created in stars because of very high temperature.

21. What do you mean by fusion?

Ans. Solid changes into liquid is called fusion.

22. What do you mean by condensation?

Ans. Gas changes into liquid is called condensation.

23. What do you mean by vaporisation?

Ans. Liquid changes into gas is called vaporisation.

24. What is the full form of BEC?

Ans. Bose-Einstein condensation.

25. Arrange the following substances increasing, order of forces of attraction between the particles water, ice, water vapour.

Ans. Water vapour <water < ice.

26. What is the name of the gas in a fluorescent tube?

Ans. Helium and other gas are contained in the fluorescent tube.

27. How do form the BEC?

Ans. The BEC is formed by colling a gas of extremely low density, about one-hundred thousandth the density of normal air.

28. What type of clothes should we wear in summer?

Ans. Cotton clothes.

29. Why do we use cotton clothes in summer?

Ans. Cotton is a good absorber of water. It absorb the sweat and exposing to the atmosphere for easy evaporation.

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