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41.

Hydroelectric power is the electric power generated by the energy of:

A.	Flowing water	B.	River water
C.	Dam water	D.	Falling water

42.

In Pakistan Tarbela, Mangla and Warsak dams are the main:

A.	Hydro-electric power plants	B.	Nuclear power plants
C.	Thermal power plants	D.	Power plants

43.

In USA, electricity is also being generated with the half geothermal power plants in which is used water:

A.	Streams	B.	Sea
C.	River	D.	Hot springs

44.

As a source of power generation, windmills are still in use in some European countries, especially:

A.	Poland	B.	Finland
C.	Holland	D.	England

45.

Methane gas is produced during the scientific process of:

A.	Hydrogenation	B.	Pyrolysis
C.	Bioconversion	D.	Incineration

46.

The temperature of surface water of oceans is about 25C and it is 5?C at the depth of few hundred meters in the:

A.	Temperate region	B.	Tropical region
C.	Torrid region	D.	Equatorial region

47.

People taking food adequate in calories but deficient in protein may suffer from:

A.	Malformation	B.	Malfunction
C.	Malnutrition	D.	Undernourishment

48.

Dams and canal networks developed for irrigation purposes in Pakistan and may other countries create the problem of:

A.	Salinity and soil erosion	B.	Soil depletion and water logging
C.	Salinity and water logging	D.	Soil erosion and depletion

49.

The annual population growth rate of some countries like Great Britain, Sweden, Norway, Hungary and Japan is:

A.	Zero%	B.	Nearly zero%
C.	0.50%	D.	1%

50.

The annual population growth rate is Pakistan is the highest in the world, which is:

A.	1.50%	B.	1.80%
C.	1.90%	D.	1.10%