Answer: permanently frozen subsurface soil
Which of the following material has the highest hydraulic conductivity ?
Which of the following energy sources is not renewable on human time scale ?
For a solar flat plate collector the following data is given : Useful heat gain = 28 watts/m2 per hour, solar
radiation intensity = 350 watts/m2 per hour and the factor to convert beam radiation to that on the plane of
the collector = 1.2. The collector efficiency is
Identify the correct sequence of the fuels in order of their increasing carbon intensity :
Answer: Nuclear < Natural gas < Oil < Bituminous coal
In nuclear thermal reactors, which of the following is not used as moderator ?
The minimum temperature gradient (°C/km) required for OTEC is about
A solar pond has electricity generating capacity of 600 MWe. If the efficiency of solar energy to electric generation process was 2% and solar energy supply rate was
300 W/m2, what is the area of solar pond ?
Which of the following causes warming of atmosphere but cooling of the earth’s surface ?
Answer: Black carbon aerosols
Noise levels of 80 dB refers to a sound pressure level of
Asphyxiation is caused by
Sequence of a typical sewage treatment plant operation process will be
Answer: Aeration → Flocculation → Sedimentation → Recarbonation → Filtration → Disinfection
Which one of the following isotopes has maximum half-life period ?
Which of the following organic compounds is not of biogenic origin ?
Which of the following is used as plant indicator for detection of presence of SO2 and HF in air ?