The main constituent of CNG is

(1) butane
(2) methane
(3) ethane
(4) propane

To produce bio-gas in a bio-gas plant, we need

(1) Air but not water
(2) Water but not air
(3) Air and water
(4) Neither air nor water

Gasoline is produced by refining which fossil fuel?

(1) Natural gas
(2) Coal
(3) Petroleum
(4) Propane

Energy released in the fission of 1 kg of U-235 is equivalent to energy obtained from burning of coal weighing

(1) 25 ton
(2) 250 ton
(3) 2500 ton
(4) 25000 ton

What is the range of wavelength of U.V. rays?

(1)  132 to 200 nm
(2)  310 to 400 nm
(3)  310 to 200 nm
(4)  300 to 200 nm