Consider the following types of vehicles:
I. Full battery electric vehicles
II. Hydrogen fuel cell vehicles
III. Fuel cell-electric hybrid vehicles
How many of the above are considered as alternative powertrain vehicles?

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?

According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions?

Consider the following statements:

1. The Environment Protection Act, 1986 empowers the Government of India to state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought.
2. The Act lays down the standards for emission or discharge of environmental pollutants from various sources.
   Which of the statements given above is/are correct?

In the context of which one of the following are the terms 'pyrolysis and plasma gasification' mentioned?