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 1. Optical fiber works on the principle of

a) Total internal reflection          b) Refraction

c) Scattering                              d) Interference

Ans      A


2. Consider the following natural phenomena:

1. Terrestrial heating                 2. Reflection of light

3. Refraction of light                  4. Diffraction of light

Due to which of the above given phenomena is mirage formed?

a) 1 and 2                      b) 2, 3 and 4                  c) 1 and 3                      d) 4 only

Ans      C


3. The Laser is a beam of radiations which are

a) Non-coherent and non-monochromatic           b) Coherent and non-monochromatic

c) Non-coherent and monochromatic                  d) Coherent and monochromatic

Ans      D


4. Which organelles in the cell, other than nucleus contains DNA?

a) Centriole                 b) Golgi apparatus      c) Lysosomes               d) Mitochondria

Ans : D


5. Which of the following cell organelles play the most significant rule in protein synthesis –

a) Lysosome and centrosome                     b) Endoplasmic reticulum and ribosome

c) Golgi apparatus and mitochondria             d) Lysosome and mitochondria

Ans :B


6. The cellular and molecular control of programmed cell death is known as –

a) Apoptosis                b) Ageing                    c) Degeneration            d) Necrosis

Ans :A


7. Isobars are lines displaying areas of equal –

a) Humidity                b) Temperature

c) Rainfall                   d) Atmospheric Pressure

Ans      D

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