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 –
Ans. (a) diffusion.
2. A change of state of matter directly from solid to gas without changing into liquid state is called.
Ans. (b) sublimation.
3. A change of state of matter directly from gas to liquid is called-
Ans. (d) condensation.
4. A change of state of matter directly from liquid to gas is called-
Ans. (c) vaporisation.
5. A change of state of matter directly from solid to liquid is called
Ans. (a) fusion.
6. S.I. unit of temperature is –
Ans. (c) Kelvin.
7. Which is of the unit of temperature in the following –
8. Which is the correct form in the following
(a) 0°C = 275k
(b) 0°C = 273k
(c) 0°℃ = 274k
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 –
Ans. (d) evaporation.
11. The amount of water vapour present in the air is called –
(d) vapour state
Ans. (b) humidity.
12. Which of the following temperature water changes to vapour state is?
Ans. (c) 373k.
13. Which of the following temperature water changes to solid state is?
Ans. (d) 27 k.
14. If the surface area is increased, then the rate of evaporation is –
(b) remain same
(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
(d) It is not depend on humidity
Ans. (b) slower.
17. The forces of attraction between particles are maximum is
(c) water vapour
(d) neither maximum nor minimum but equal
Ans. (b) ice.
18. The forces of attraction between particles are minimum in –
Ans. (d) oxygen.
19. Evaporation causes for
Ans. (c) cooling.
20. Physical state of water at 0°C.
(a) water vapour
(c) familiar water
(d) cold water
Ans. (b) ice.
21. The unit of pressure is –
(a) Cubic metre
Ans. (d) Pascal.
22. The unit of density is –
(a) Cubic metre
(b) Kilogram per cubic metre
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
(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.
Ans. (a) 283-273 = 10°C
9. Convert the following temperatures to the Kelvin scale.
Ans.(a) 35+273 = 208k
(b) 173+273 446k
10. What is the physical state of water at-
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?
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.
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.