Which of the following fuel has maximum resistance to detonation?
A.Toulene
B.Benzene
C.Iso-octane
D.n-heptane
Category: Environmental Engineering Mcqs
What will be the colour of red rose when it is seen through green glass?
A.White
B.Black
C.Pink
D.Brown
E.Green
The term BOD is associated with pollution arising out of
A.air
B.water
C.noise
D.land
The percentage of nitrogen in air by weight is around
A.75.5 percent
B.65.5 percent
C.24.3 percent
D.23.1 percent
E.20.3 percent
Dark, black smoke from diesel engines usually results when engine is
A.Idling
B.Running at slow speeds
C.Running at light loads
D.Running at full speed but under load conditions
E.Running at full load and full speed
The total count of bacteria in portable water should not exceed
A.10,000 per c.c.
B.5000 per c.c.
C.998 per c.c.
D.10 per c.c.
Which of the following is the major source of pollutant hydrogen sulphide?
A.Decaying organic matter
B.Auto exhaust
C.Oil burners
D.Solar energy
E.None of the above
The average percentage of carbon and hydrogen in petrol may be roughly given as
A.50% C, 50% H2
B.85% C, 15% H2
C.15% C, 85% H2
D.70% C, 30% H2
Which of the following acts as ignition accelerator for C.I. engine fuels?
A.Acetone peroxide
B.Hydrogen peroxide
C.Aromatic compounds
D.n-heptane
Permissible noise level in small conference room is
A.10 to 15 dB
B.15 to 25 dB
C.35 to 40 dB
D.55 to 60 dB
