Which one of the following colours is not a part of the rainbow?
Grey
Grey is not a spectral colour of the rainbow. Violet, orange and red are part of the visible spectrum separated by dispersion in water droplets.
Consider the following salient features of Tornado and choose the correct option:
A. Tornadoes are very violent rotating systems of air
B. The pressure in the center of tornado is extremely low
C. The movement of tornadoes is in well-defined route and direction
D. The arrival of tornado is heralded by dark and thick clouds in the sky
Choose the correct answer from the options given below :