Which of the following statements is/are correct?

1. Air close to the Earth's surface is heavier.
2. Air close to the Earth's surface contains larger quantity of water vapour and dust particles.

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Which one among the following terms is used to describe a plant that grows only in a mountainous environment?

Which of the following statements about tornadoes are correct?

Tornadoes usually spin

1. anticlockwise in the northern hemisphere.
2. clockwise in the southern hemisphere.
3. clockwise in the northern hemisphere.
4. anticlockwise in the southern hemisphere.

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What would be the date and local time of a place located at 88^o 30' E longitude when the local time at 0^o longitude is 19.00 hrs of 28th February 2013?

Jawahar tunnel on Jammu-Srinagar highway passes through

Match List I with List II and select the correct answer using the code given below the lists :