Q1 of 59 Page 1

Write the name and structure of an aldehyde with four carbon atoms in its molecule.

The Name of an aldehyde with four carbon atoms in its molecule is Butanal and the structure is as follows:


More from this chapter

All 59 →
16

The image of an object formed by a lens is of magnification -1. If the distance between the object and its image is 60 cm, what is the focal length of the lens? If the object is moved 20 cm towards the lens, where would the image be formed? State reason and also draw a ray diagram in support of your answer.

 19

(a) Define focal length of a spherical lens.

(b) A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical center of the lens be placed so that its image is formed 15 cm away from the lens? Find the size of the image also.


(c) Draw a ray diagram to show the formation of image in the above situation.

 2

List two functions of ovary of human female reproductive system.

 3

In a food chain of frog, grass, insect and snake, assign trophic level of frog.