Explanation: Biogas is a mixture of methane, carbon dioxide, and hydrogen sulfide. Primarily, it is dominated by methane gas (75 %).
Q 2: The percentage of ethanol in blended petrol is
Answer is A)
Explanation: The Government has a 10 % blending target for mixing ethanol with petrol by 2022 & 20 % blending target by 2030.
Q 3: Increasing the pressure inside the biogas plant
Answer is B)
Explanation: The metabolism of anaerobic bacteria is inhibited by increased pressure inside the digester. A pressure of 6-10 cm of water column is considered ideal for properly functioning the digester.
Q 4: Which one of the following statements is not true for geothermal energy systems?
Answer is B)
Explanation: Geothermal energy systems do not require an extra storage facility.
Q 5: When the water is ejected from the earth’s interior in the form of hot water, it is called
Answer is C)
Explanation: A Geyser throws up a jet of hot water and steam into the air. Springs are natural water sources from which hot water flows.
Q 6: What is the main source for the formation of wind?
Answer is B)
Explanation: The wind is caused by the uneven heating of the atmosphere by the sun, variations in the earth’s surface, and rotation of the earth. But, the main source of wind is the uneven heating of the Earth’s surface by the Sun.
Q 7: During the day, the air above the land heats up more quickly than the air over water.
Answer is A)
Explanation: The specific Heat of water (4180 J/kg.K) is more than sand (670 J/kg.K). Specific heat is a measure of heat capacity, or how much heat a material can store when changing temperature.
Q 8: Pelton wheel is
Answer is B)
Explanation: Pelton wheel is a high head & low discharge turbine.
Q 9: The part of the hydel power plant which takes water from the wall house to the turbine
Answer is A)
Explanation: Penstock takes water from the wall house to the turbine.
Q 10: Name the chemical process in which a substance reacts with oxygen to give out heat.
Answer is C)
Explanation: Combustion is the reaction of a substance with oxygen to create heat.
