In fuel cell, the ___________ energy is converted into electrical energy?

A. Mechanical
B. Chemical
C. Heat
D. Sound

The main source of production of biogas is__________________?

A. Human waste
B. Wet cow dung
C. Wet livestock waste
D. All above

The proper indication of incomplete combustion is_______________?

A. High co content in flue gases at exit
B. High co2 content in flue gases at exit
C. High temperature of flue gases
D. The smoking exhaust from chimney

The percentage 02 by volume in atmosphere air is____________?

A. 21%
B. 23%
C. 77%
D. 79%

The percentage O2 by Weight in atmospheric air is____________?

A. 18%
B. 23%
C. 77%
D. 79%

The commercial sources of energy are____________?

A. Solar, wind and biomass
B. Fossil fuels, hydropower and nuclear energy
C. Wood, animal wastes and agriculture wastes
D. None of the above

Jinnah the only film on the life of Quaid-e-Azam was produced by?

A. Jamil dehlavi
B. Akbar s. ahmed
C. Pervaiz iqbal cheema
D. Shabab dhlvl

Due to which of the following reasons the cables should not be operated too hot ?

A. the oil may loose its viscosity and it may start drawing off from higher levels
B. expansion of the oil may cause the sheath to burst
C. unequal expansion may create voids in the insulation which will lead to ionization
D. the thermal instability may rise due to the rapid increase of dielectric losses with temperature

Which NGO has rolled out an election information portal titled “Election Pakistan”?

A. Free and fair election network (fafen)
B. Aed
C. Himalayafoundation
D. Afs intercultural exchange

Out of 9,391 candidates, how many candidates managed to pass the written test of the CSS examination 2017?

A. 300
B. 308
C. 312
D. 315