Q4 of 36 Page 1

Why does the Sun appear white at noon?

The light reaching the surface of earth, from the sun during noon, passes through the least distance in the atmosphere. Thus, light is least scattered at noon. Therefore, the sun appears white at noon.


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2

Write the chemical name and chemical formula of the salt used to remove permanent hardness of water.

 3

Which of the following is not observed in a homologous series? Give reason for your choice.

a) Change in chemical properties


b) Difference in -CH2 and 14u molecular mass


c) Gradation in physical properties


d) Same functional group


 5

Both a spherical mirror and a thin spherical lens have a focal length of (-)15 cm. What type of mirror and lens are these?

 6

The image formed by a concave mirror is observed to be real, inverted and larger than the object. Where is the object placed?

OR


Name the part of a lens through which a ray of light passes without suffering any deviation.