Q2 of 58 Page 1

What is DNA?

DNA stands for Deoxyribose Nucleic Acid which is the carrier of genetic information from parents to the off springs.


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36

A student focuses the image of a well illuminated distant object on a screen using a convex lens. Meter that he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens.

(a) In which direction – towards the screen or away from the screen, does the move the lens?


(b) What happens to the size of the image-does it decrease or increase?


(c) What happens to the image on the screen when he moves the object very close to the lens?

 1

Name the following compounds:

(i) CH3 – CH2 – OH


(ii)

3

List two biotic components of a biosphere.

 4

A ray of light is incident on a convex mirror as shown. Redraw the diagram and complete the path of this ray after" reflection from the mirror. Mark angle of incidence and angle of reflection on it.