With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity. Consider the following statements :

1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is / are correct?

The problem of international liquidity is related to the non-availability of

With reference to bio-toilets used by the Indian Railways, consider the following  statements:

1.The decomposition of human waste in the bio-toilets is initiated by a fungal inoculum.
2. Ammonia and water vapour are the only end products in this decomposition which are released into the atmosphere.

Which of the statements given above is/are correct?

H1N1 virus is sometimes mentioned in the news with reference to which one of the following diseases?

There is a Parliamentary System of Government in India because the

The substitution of steel for wooden ploughs in agricultural production is an example of