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Atmosphere and Volatile Liquids

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Atmosphere and Volatile Liquids
SECTION - A
1. Name the technique to separate [1]
(a) Salt from Sea – water
(b) Butter from curd
2. Define velocity. [1]
3. What do you mean by free fall? [1]
4. Mention any 2 advantages of using Italian bee variety in honey production. OR
(a) Identify soluble and solvent in the following solutions: [3]
(i) Aerated drinks
(ii) Tincture of iodine
(iii) Lemon water
(b) State the principle of each if the following methods of separation of mixtures. [2]
(i) Centrifugation method
(ii) Separation using separating funnel.
24. (a) Differentiate between Mass and Weight [Four points]. [2] (b) Show that weight of an object on moon is equal to of the weight if the object on the earth. Given Mass of Earth , Mass of moon , radius of earth , radius of moon = [3] OR
(a) Will a sheet of paper fall slower than one that is crumpled into a ball in vacuum? Explain. [1] (b) Show mathematically that acceleration experienced by an object is independent of its mass. [2]
(c) Show that value of g = 9.8 m/s2 [2] 25. Describe an activity to demonstrate endosmosis and exomosis. Draw a diagram also. [5]
OR
(a) Give the chemical composition and functions of plasma membrane and cell wall. [3+2]
Differentiate between the two
(b) What is meant by membrane biogenesis?
Which cell organelle is concerned with membrane biogenesis?
SECTION B
26. A student was asked to mix the while of an egg with water and stir well. The student observed that [1] (a) Transparent solution is formed (b) A translucent mixture is formed (c) Egg while settles down at the bottom (d) Egg white floats on the surface of the water
27. A student by mistake mixed iron filings and sulhpur powder. He wanted to separate them each other. The method you, would advice him to use is

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