SCIENCE AND TECHNOLOGY—2004 (Set II— Outside Delhi)

Except for the following questions, all the remaining questions have been asked in Set I.


Q. 2. Name the planet in the Solar System which has the greatest number of moons. 1

Q. 4. Write the (i) name and (ii) structural formula of the functional group present in the compound, CH3COOH. 1

Q. 8. a) What is meant by the photosphere of our Sun? 2
b) What is the corona of the Sun and when can it be seen? 2

Q. 10. What does ‘slaking of lime’ stand for? Why is there a hissing sound during this process? Write the chemical equation for the reaction involved. 2

Q. 12. A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 30 cm. The distance of the object from the lens is 20 cm. Find the (i) position, (ii) nature and (iii) size of the image formed. 3

Q. 14. Write chemical equations for reactions taking place when: 3
a) Cinnabar is heated in air.
b) Concentrated sulphuric acid and sulphur are heated together.
c) Calcium metal reacts with water.

Q. 15. Give reasons for the following: 3
a) Zinc oxide is considered an amphoteric oxide.
b) Non-metals in general do not displace hydrogen from dilute acids.
c) Metals conduct electricity.


Q. 21. Who first proposed the theory of inheritance of acquired characters? 1

Q. 23. What is osmoregulation? 1

Q. 28. What is the function of gizzard in a grasshopper? Draw a labelled diagram showing the digestive system of a grasshopper.
What is the function of epiglottis in man? Draw a labelled diagram showing the human respiratory system. 3

Q. 30. Give two reasons for avoiding frequent pregnancies by women.
Explain the following methods of contraception giving one example of each: 5

a) Barrier method b) Chemical method c) Surgical method.