chemistry - matter in our surroundings

Class 9 - Chemistry

Matter in Our Surroundings

MCQ
Q&A
Notes
Question:
Explain why, ice at 0°C is more effective in cooling than water at the same temperature.
Answer:



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Questions and Answers


Matter in Our Surroundings - Questions
1. The mass per unit volume of a substance is called density (density=mass/volume). Arrange the following in order of increasing density:
Air, Exhaust from chimneys, Honey, Water, Chalk, Cotton and Iron.
Answer
2. What is the physical state of water at the following temperatures? (a) 25 °C (b) 0 °C (c) 100 °C
Answer
3. What are the differences between boiling and evaporation?
Answer
4. Convert the following temperatures:
a. -78.0 °C to Kelvins
b. 775 K to °C
c. 489 K to °C
d. 24 °C to kelvins
Answer
5. What causes evaporation?
OR
Explain evaporation and its cooling effect in terms of kinetic energy of particles.
Answer
6. Why does steam cause more severe burns than boiling water, though both are at the same temperature?
Answer
7. Give reasons for the following observations. The smell of hot sizzling food reaches you several meters away, but to get smell from cold food you have to go close.
Answer
8. Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K
Answer
9.

Draw a diagram to show interconversion among states of matter.


Answer
10. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Answer
11. Which of the following state does not exist at room temperature conditions: a) Solids b) Liquids c) Gas d) Plasma
Answer
12.

State True or False:

a. Evaporation of water is a bulk phenomenon.
b. Diffusion takes place in haphazard and random way.
c. SI unit of pressure is Pascal.
d. A gas is highly incompressible fluid.
e. Solids and liquids can be identified from their characteristic melting and boiling points.


Answer
13.

Fill in the blanks:

a. The process of ________ causes cooling.
b. The process of cooling glass is known as ____.
c. Liquids have no fixed ______ but have fixed _____.
d. ____ exists in all three states of matter.
e. Carbon dioxide is a white solid called _____ at temperature below ______.


Answer
14. What are the characteristics of matter?
Answer
15. Which of the following are matter?
Chair, Air, Love, Smell, Hate, Almonds, Thought, Cold, Cold drinks, Smell of perfume
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16. What is SI unit of temperature? Give mathematical relation also.
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17. Define transpiration.
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18. List any five physical properties of liquids.
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19. Why is light not considered matter?
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20. How heat is transferred when a solid sublimes?
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21. The mass per unit volume of a substance is called density.(density = mass/volume). Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Answer
22. Define Density.
Answer
23. What do you mean by the term Volume?
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24. What do you mean by the following terms:
a. Evaporation
b. Sublimation
c. Condensation
Answer
25. Define Latent Heat of Fusion and Latent Heat of vaporisation.
Answer
26. Define the term Volatile Liquid.
Answer
27. Arrange the following substances in increasing order of intermolecular force of attraction: water, sugar, oxygen
Answer
28. Why do diffusion become faster at higher temperatures?
Answer
29. Define boiling. Why boiling is considered as a bulk phenomenon?
Answer
30. What is evaporation? Why does evaporation cause cooling?
Answer
31. In which case evaporation of water will be faster i.e. near the sea or far away from the sea.
Answer
32. Why is ice at 273 K more effective in cooling than water at the same temperature?
Answer
33. What are the ways a gas can be liquefied?
Answer
34. What is a dry ice and what are its properties?
Answer
35. How vapour is different from gases? Give examples of each.
Answer
36. Why do solids expand a bit on heating and contract a bit on cooling?
Answer
37.

What are different physical states of matter? Name their properties as well?


Answer
38. Explain compressibility in gases with an example?
Answer
39. What do you mean by change in state?
Answer
40. Give reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is solid.
Answer
41.

Why does the temperature of a substance remain constant during melting and boiling even when heat is being supplied to it continuously?


Answer
42.

Differences among solids, liquids and gases.


Answer
43. Define matter.
Answer
44.

Name matter classification in terms of composition.


Answer
45. After rains when do rain drops dry away easily– on a cloudy day or on a sunny day? State reason also.
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46. Our own bodies contain examples of all three states of matter. Can you identify these?
Answer
47. How can matter change its state?
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48. What factors affect the rate of evaporation?
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49. Why solids cannot be compressed like gases?
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50. How matter is classified in terms of physical state?
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