How many elements are there in 5th period of modern periodic table?

Two pieces of conductor of same material and of equal length are connected in series with a cell.One of the two pieces has cross-sectional area double than that of the other.Which one of the following statements is correct?

Which one of the following processes is not a part of chemical weathering?

Consider the following statements with regard to cold waves in winter season in Northern India

1.There is a lack of maritime influence

2.Northern India is nearer to Himalayan region

3.Air mass comes from polar regions to Northern India

Which of the statements are correct?

If 82° 30′ east longitude(Allahabad) shows 6.00 am of Sunday(local time),wkat would be the local time of Florida(USA) located on

82°  west longitude? 

Ozone layer of the earth's atmosphere is important for living organisms because it