Get the CBSE Class 9th Science chapter, Matters in Our Surroundings: Important Topics and Questions. This will provide you with a very clear idea about what type of questions are being framed for the exam and from which topics. The pattern in which the Question Paper is set is quite different from the style in which the course structure is actually defined. Consider the below mentioned Important terms and Questions at the time of preparation.
Revise the important terms/topics for the chapter Number System and then opt for the important questions:
• List the important characteristics of matter.
• Difference among solid, liquid and gas.
• List any five physical properties of liquids
• Classify the matter in terms of physical state and composition
• Simple and clear-cut definitions along with the differences between the following terms:
• Difference between latent heat of fusion and latent heat of vaporization
• Definitions of melting point, boiling point and freezing point
• Read clearly about the sublimation process.
• Identify the matter from the given terms:
Chair, Air, Love, Smell, Hate, Almonds, Thought, Cold, Cold drinks, Smell of perfume
• The smell of hot sizzling food reaches you several meters away, but to smell the cold food you have to get close to it. Give the logical explanation for the same
• What is Diffusion, and why gases diffuse rapidly?
• 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
• Explain the application of compressibility in gases with an example
• Define the term evaporation
• Mention the uses of LPG and CNG
• What is SI unit of temperature? Give mathematical relation also
• Convert the following temperatures to Celsius scale:
(a) 333 K
(b) 473 K
• What is absolute temperature
• Which state of matter is most easily compressible
• A diver is able to cut through water in a swimming pool. Identify which property of matter is working here?
• Arrange the following substances in increasing order of intermolecular force of attraction:
Water, Sugar, Oxygen
• Give reasons to justify:
(a) Water at room temperature is in liquid form
(b) An iron almirah is in solid form
• Diffusion becomes faster at higher temperatures. Why?
• Boiling is considered as bulk phenomenon. Why?
• Why does the temperature of a substance remains constant during melting and boiling even when heat is being supplied to it continuously?
• What factors affect the rate of evaporation?
• In which case evaporation of water will be faster; near the sea or far away from the sea?
• What do you mean by solid ice? Why CO2 is kept under low pressure?
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