Questions

Paulo Ceolho is the author of The Alchemist

I would do the following if I run out of ideas for a new ad:

       - Word of mouth marketing

       - Direct marketing

       - Public opinions survey

       - Trade show/exhibition promotion etc.  

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at bottom also increases. Therefore the spring balance reading increases. Thus (a) is correct.

Uranium is not a fossil fuel whereas coal, petroleum and natural gas are all natural resources.

Fossil fuels are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. In common dialogue, the term fossil fuel also includes hydrocarbon-containing natural resources that are not derived from animal or plant sources