2.
Name any two biodegradable pollutants.3. Define soaps?
4. Why is water necessary for living organisms?
5. With respect to air, the refractive index of ice is 1.31 and that of rock salt is 1.54. Calculate the refractive index of rock salt with respect to ice.
6. Why is K more reactive than Li?
7. A convex mirror used on a bus has a focal length of 200 cm. If a scooter is located at 100 cm. from this mirror find the position, nature and magn ification of the image formed in the mirror.
8. (i) State Snell’s law of reflection of light. (ii) A transparent medium A floats on another trans parent medium B. When a ray of light travels obliquely from A into B, the reflected ray bends away from the normal. Which of the two media A and B if optically denser and why?
9. What is the need for sign convention? Write them.
10. What are optical fibres? Give three applications of these fibres.
11. Suggest three ways to maintain a balance between en vironment and development to survive.
12. DDT that was sprayed in minute amount on food plant s was detected in high concentration in man? How did it happen? Explain.
13. Give three drawbacks (limitations) of Mendeleev’s P eriodic Table.
14. Sheeba studies in grade 9 and is a secretary of sch ool’s club. As per practice in the school, all members of science club assemble in Physics lab in last two periods on every Friday. Sheeba also extends help to her mother in kitchen. One day she observed that the apparent random wavering or flickering of objects seen throu gh a turbulent stream of hot air rising above the fire in the kitchen. She discussed about this with her friends and decided to raise the question in school’s science club meeting.
Read the given passage and answer the following que stions:
(a) Explain the reason behind the observation.
(b) Name the similar phenomenon on a larger scale. Also , draw the ray diagram.
(c) What values are shown by Sheeba?
15. How does natural vegetative propagation occur?
16. What are the male and female gonads in human beings ? State any two functions of each of them.
17. Name any three organs homologous to human hand. Why are they considered homologous?
18. State three laws of Mendel.
19. Describe the anatomy of human male reproductive sys tem.
Or What is meant by tissue culture? How this technique is performed? In which area this technique is finding its application?
20. Explain double bond and triple bond with help of tw o examples in each case.
Or Explain the following terms:
(a) Emulsifying
(b) Substitution reaction
(c) Poly merization
(d) Saponification
(e) Methylated spitit
21. Tabulate the process of reproduction into its vario us types, giving one example of each type.
Or Define grafting. Suggest any two advantages and dis advantages of grafting.
22. Explain the cleansing action of soaps and detergent s.
Or Write in short, how carbon compounds are named acco rding to IUPAC nomenclature?
23. (i) State the lens’s formula and its magnification . (ii) Using the lens formula, locate the position of an image formed due to an object at infinity by a convex lens of focal length . f
Or (i) How will you find the net focal length of a combina tion of lenses whose focal length are 15 cm and 5 cm respectively?
(ii) Define power. Find the power of the combination and express whether it is converging or diverging combination.
24. Draw a labelled diagram of human eye and explain th e image formation.
Or What is cause for (i) Myopia and (ii) Hypermetropia Show the defective eye and explain how it is correc ted?
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