1 and 2 are correct.
Dew point, the temperature at which the atmosphere is saturated with water vapour, when it is cooled without changing its pressure or vapour content. A given volume of air containing much water vapour has a higher dew point than the same volume of drier air; thus the dew point gives an indication of the humidity. In meteorology the dew point is applied, for example, in predicting the height of the base of certain types of clouds. A higher dew point means there will be more moisture in the air.

1 and 2 are correct.
The Coramandal Coast stands between the Eastern Ghats and the Bay of Bengal. The Western Ghats runs along the Arabian sea and the lands between these are known as Konkan up to Goa and beyond that as Kanara. The southernmost part is known as Malabar Coast.
The Anaimudi is the highest peak in the southern peninsula. Doddabetta is one of the highest peaks in the Western Ghats. Palghat Pass is located between the Nilgiri Hills to the north and Anaimalai Hills to the south

Doldrums, also called equatorial calms, equatorial regions of light ocean currents and winds within the intertropical convergence zone (ITCZ), a belt of converging winds and rising air encircling Earth near the Equator. The northeast and southeast trade winds meet there; this meeting causes air uplift and often produces clusters of convective thunderstorms. They occur along the Equator in the Indian and western Pacific oceans and slightly north of the Equator off the African and Central American west coasts.

Atmospheric disasters include blizzard, thunderstorm, lightning, tropical cyclone, tornado, drought, hailstorm, frost, heat wave, cold waves, etc.

A polar vortex is a persistent, large-scale cyclone that circles either of the planet’s geographical poles. On Earth, the base of the polar vortices are located in the middle and upper troposphere and extend into the stratosphere.
They surround the polar highs and lie in the wake of the polar front. These cold-core low-pressure areas strengthen in the winter and weaken in the summer due to their dependence upon the temperature differential between the equator and the poles. They usually span less than 1,000 kilometers in diameter within which the air circulates in a counter-clockwise fashion in the Northern Hemisphere, and in a clockwise fashion in the Southern Hemisphere. As with other cyclones, their rotation is caused by the Coriolis effect.