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Answer the following questions: (c) A ...

Answer the following questions:
(c) A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter to the diver than what he actually is?

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(c) Taller
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In an experiment to estimate the size of a molecule of oleic acid 1 mL of oleic acid is dissolved in 19 ml of alcohol. Then I mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow through. The solution spreads over the surface of water forming one molecule thick layer. Now lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule. Read the passage carefully and answer the following questions. (a) Why do we dissolve oleic acid in alcohol ? (b) What is the role of lycopodium powder ? (c) What would be the volume of oleic acid in each ml of solution prepared ? (d) How will you calculate the volume of n drops of this solution of oleic acid ? (e) What will be the volume of oleic acid in one drop of this solution ?

Answer the following questions based on the P-T phase diagram of carbon dioxide : (a) At what temperature and pressure can the solid, liquid and vapour phases of CO_(2) coexist in equilibrium ? (b) What is the effect of decrease of pressure on the fusion and boiling point of CO_(2) ? (c) What are the critical temperature and pressure for CO_(2) ? What is their significance ? (d) Is CO_(2) solid, liquid or gas at (a) -70^(@)C under 1 atm, (b) -60^(@)C under 10 atm, (c) 16^(@)C under 56 atm ?

It is said that elemental composition of living organisms and that of inanimate objects (like earth's crust) are similar in the sense that all the major elements are present in both. Then what would be the difference between these two groups ? Choose a correct answer from among the following. (A) Living organisms have more gold in them than inanimate objects. (B) Living organisms have more water in their body than inanimate objects. (C) Living organisms have more carbon, oxygen and hydrogen per unit mass than inanimate objects. (D) Living organisms have more calcium in them than inanimate objects.

NCERT GUJARATI-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISES
  1. Answer the following questions: (a) You have learnt that plane and c...

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  2. Answer the following questions: (b) A virtual image, we always say, ...

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  3. Answer the following questions: (c) A diver under water, looks obliq...

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  4. Answer the following questions: (d) Does the apparent depth of a tan...

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  5. Answer the following questions: (e) The refractive index of diamond ...

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  6. The image of a small electric bulb fixed on the wall of a room is to b...

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  7. A screen is placed 90cm from an object. The image of the object on the...

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  8. (a) Determine the 'effective focal length' of the combination of the t...

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  9. At what angle should a ray of light be incident on the face of a prism...

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  10. A card sheet divided into squares each of size 1 mm^(2) is being viewe...

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  11. (a) At what distance should the lens be held from the figure in Exerci...

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  12. What should be the distance between the object in Exercise 9.24 and th...

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  13. Answer the following questions: (a) The angle subtended at the eye b...

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  14. Answer the following questions: (b) In viewing through a magnifying ...

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  15. Answer the following questions: (c) Magnifying power of a simple mic...

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  16. Answer the following questions: (d) Why must both the objective and ...

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  17. Answer the following questions: (e) When viewing through a compound ...

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  18. An angular magnification (magnifying power) of 30X is desired using an...

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  19. A small telescope has an objective lens of focal length 140cm and an e...

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  20. (a) For the telescope described in Exercise 9.28 (a), what is the sepa...

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