Tag: physics

Questions Related to physics

Fuel obtained from biomass are:

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. Charcoal (from wood).

  2. Bio-gas from animal waste (cow-dung etc).

  3. Bio-diesel (from sugar cane and oilseed crops).

  4. All of above

Show answer
Correct Option: D
Explanation:

Biomass is a organic fuel.Charcoal is obtained from burning of the wood. Biogas is obtained from organic wastes such as animal excreta, agricultural waste etc, Bio-diesel can be obtained from oil seed crops such as Jatropa.

Biogas contains _____ % methane.

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. 75-85%

  2. 50-75%

  3. 80-90%

  4. 35-55%

Show answer
Correct Option: B
Explanation:

Methane forms the major constituent of a biogas. Amount usually ranges from 50-75%.

State whether the given statement is True or False :
Cow-dung, crop residue, garbage and sewage are decomposed in the absence of oxygen to produce bio-gas.

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Biogas is formed by anaerobic decomposition of the organic material such as sewage, plants and household waste, human and animal excreta etc.

Biogas plant is generally made of what?

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. Bricks

  2. Wood

  3. Tiles

  4. Plaster of Paris

Show answer
Correct Option: A
Explanation:

Temperature inside the biogas increases tremendously during the anaerobic fermentation process. Out of the given options, brick is the suitable material to be used for the making of the biogas plants to withstand high temperatures.

Choose the correct statement(s):
(1) Sewage can be used with gobar and agricultural waste to produce bio gas in biogas plant.
(2) The largest composition in biofuel is of methane. 
physics sources of energy biomass and biogas biogas conventional sources of energy

  1. (1) only

  2. (2) only

  3. Both (1) and (2)

  4. None of the above

Show answer
Correct Option: C
Explanation:

Organic material is used as a substrate for the production of a biogas. Organic matters encompasses sewage, kitchen waste, animal and human excreta, etc.

Biofuel produced from biomass consists of methane, hydrogen, nitrogen etc. Largest component is of methane (50%-75%).

Which of the following is not an example of a biogas source of  energy?

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. Wood

  2. Gobar

  3. Nuclear Energy

  4. Coal

Show answer
Correct Option: C
Explanation:

Nuclear energy is not an example of a biogas source of  energy as it uses radioactive substances to produce energy.

The largest installation of wind turbines in our country is in:

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. Ladakh

  2. Gujarat

  3. Kanyakumari

  4. Madhya Pradesh

Show answer
Correct Option: A

Which of the following is not a feature of bio energy?

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. It improves soil quality

  2. It enhances water retention

  3. It reduces carbon dioxide content in the atmosphere

  4. It increases pollution

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Correct Option: A

Wind with a velocity $72 km/hr$ blows normally against one of the walls of a house with an area of $100 m$ (density of air is $1.2 kgm^{-2}$)

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. Force exerted on the wall if the air moves parallel to wall after striking is $48000 N$

  2. Force exerted on the wall if the air moves normal to the wall after striking is $96000 N$

  3. Force exerted on the wall is maximum if air moves parallel to the wall after striking

  4. Force exerted on the wall is maximum if air moves at certain angle with wall after striking

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Correct Option: A

Which of the following is not a high wind-energy region of India?

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. Bay of Bengal

  2. Gujarat

  3. The Arabian sea Islands

  4. Punjab

Show answer
Correct Option: D