Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning? 

$1.$ Smelting units

$2.$ Pens and pencils

$3.$ Paints

$4.$ Hair oils and cosmetics

Select the correct answer using the codes given below:

A team of scientists at Brookhaven National Laboratory including those from India created the heaviest antimatter (anti-helium nucleus). What is/are the implication/ implications of the creation of anti-matter? 

1. It will make mineral prospecting and oil exploration easier and cheaper.

2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.

3. It will help to understand the evolution of the universe.

Select the correct answer using the codes given below.

Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the earth's surface. What prevents them from reaching the surface of the earth?

Regular intake of fresh fruits and vegetables is recommended in the diet since they are good sources of antioxidants. How do antioxidants help a person maintain health and promote longevity?

A company marketing food products advertises that its items do not contain trans fats. What does this campaign signify to the customers?
1. Food products are not made out of hydrogenated oils.
2. The food products are not made of animal fats/oils.
3. The oils used are not likely to damage the cardiovascular health of consumers.
Which of the statement(s) given above is/are correct?

A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive and O positive. The blood group of the adopted son is_____.