1. What is the function of pupil in human eye ?
2. Name the products obtained on complete combustion of ethanol.
3. State any one reason for the conservation of forest and wild life.
4. Give the full form of CFC.
5. Draw a neat diagram to show the refraction of a light ray through a glass prism, and label on it the angle of incidence, and angle of deviation.
6. Where should an object be placed in front of a concave mirror of focal length 20 cm so as to obtain real image two times magnified ?
7. Why does the sun appear reddish early in the morning ? Illustrate with the help of a labelled diagram.
8. Name the type of asexual reproduction in :
(a) Planaria (b) Rhizopus (c) Spirogyra (d) Hydra
9. (i) What is common in the elements belonging to the same period of periodic table ?
(ii) Why are Chlorine and Bromine kept in the same group in the periodic table ?
10. An element belongs to third period and second group of the periodic table
(a) State number of valence - electrons in it. (b) Is it a metal or a non - metal ?
(c) Name the element. (d) Write the formula of its oxide.
11. (a) Write full form of D.N.A
(b) Why are variations essential for the species ?
12. Suggest two methods by which our consumption of coal and petroleum can be reduced.
13. Differentiate between :
(a) Asexual reproduction and Sexual reproduction. (b) Self pollination and Cross pollination
14. A needle placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of the lens. Identify the type of lens. Determine its focal length and the power. What is the size of image if , needle is 5 cm in height ?
15. A person wears spectacles of power - 2.5 D. Name the defect of vision he is suffering from. Draw the ray diagram for
(i) the defective eye (ii) its correction after using a suitable lens
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