Q18 of 53 Page 1

(a) List two sexually transmitted diseases in each of the following cases:

(i) Bacterial infections


(ii) Viral infections


(b) How may the spread of such diseases be prevented?

(a) (i)The two sexually transmitted diseases in case of bacterial infections are: Gonorrhea, Syphilis


(ii) The two sexually transmitted diseases in case of viral infections are: Warts, AIDS (Acquired immune deficiency syndrome)


(b)The spread of sexually transmitted disease can be prevented by adopting barrier methods or contraceptive methods as they provide protection against sexually transmitted disease such as AIDS. Moreover, these can be prevented by adopting hygienic conditions.


More from this chapter

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16

Define, refractive index of a transparent medium. What is its unit? Which has a higher refraction index-glass or water?

 17

What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can by corrected by using an appropriate lens.

 19

Nalin and his four friends were sitting on his roof on a pleasant day. All of them were enjoying Ludo. Suddenly ayush saw seven colours in the sky. He jumped with joy and shouted “Look, there is an indradhanush in the sky”. Then nalin explained all about the rainbow. After that every one clapped for him.

(a) What information is given by Nalin to this friends about a rainbow?


(b) Is it possible to obtain rainbow phenomenon on the earth?


(c) Which term is used for the seven colors of the rainbow?


(d) Which color appears at the top and at the bottom of the rainbow?


(e) Which moral value is shown by Nalin towards his friends?

 20

(a) what is a soap? Why are soaps not suitable for washing clothes when the water is hard?

(b) Explain action of soap in removing an oily spot from a piece of cloth.