Tag: physics

Questions Related to physics

_________is a form of renewable energy.

  1. Coal

  2. Petroleum

  3. Wind

  4. None of these

Correct Option: C

Energy that can be renewed or replenished over a period of time is called renewable energy. E.g. wind energy, solar energy etc.

The sources of energy which are being produced continuously in nature and are inexhaustible, are called

  1. Conventional sources

  2. Non-renewable sources

  3. Non-conventional sources

  4. None of these

Correct Option: C

Solar energy can be used to produce

  1. Electrical energy

  2. Mechanical energy

  3. Heat energy

  4. All of these

Correct Option: D

Which of the following devices transforms light energy into chemical energy?

  1. Car dynamo

  2. Electric motor

  3. Electric fan

  4. None of these

Correct Option: D

Among the following the sources of energy for which the sun is not a chief source of energy is ________.

  1. Hydroelectric power plant

  2. Ocean thermal energy conversion (OTEC).

  3. Tidal energy

  4. Biomass.

Correct Option: A

Which of the following is not a source of bio-fuel?

  1. bio-ethanol

  2. bio-diesel

  3. bio-petrol

  4. animal fats/oils

Correct Option: C

Biomass based energy can be obtained from :

  1. direct burning of wood, agricultural residue etc.

  2. biomass may be converted in to some other form of fuel which can release energy.

  3. bacterial decomposition of organic matters like cow dung, agricultural wastes, human excreta etc. in presence of water in absence of air, a mixture of $CH _4, CO _2, H _2, H _2S $ etc.

  4. burning of industrial waste.

Correct Option: A,B,C

A biofuel is a fuel that is produced through contemporary biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological matter. Biofuels can be derived directly from plants, or indirectly from agricultural, commercial, domestic, and/or industrial wastes. Renewable biofuels generally involve contemporary carbon fixation, such as those that occur in plants or microalgae through the process of photosynthesis. Other renewable biofuels are made through the use or conversion of biomass (referring to recently living organisms, most often referring to plants or plant-derived materials). This biomass can be converted to convenient energy-containing substances in three different ways: thermal conversion, chemical conversion, and biochemical conversion. This biomass conversion can result in fuel in solid, liquid, or gas form. This new biomass can also be used directly for biofuels.

Energy can be extracted by creating a reservoir or basin behind a barrage and then passing tidal waters through turbines in the barrage to generate electricity. This form of energy is known as

  1. solar energy

  2. wind energy

  3. hydro energy

  4. tidal energy

Correct Option: D

Tidal power, also called tidal energy, is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity.

The average annual wind density is $3\ kW/m^2/day$ along the coastal lines of Gujarat, western ghat and central parts of India which may show a seasonal variation (i.e., in winter it may go up to $10\ kW/m^2/day$ ). This can be harnessed as

  1. non-conventional energy

  2. coastal energy

  3. wind energy

  4. None of these

Correct Option: A,C

The heat energy obtainable from hot rocks present inside the earth crust is termed as

  1. Nuclear energy

  2. Tidal energy

  3. Geothermal energy

  4. None of these

Correct Option: C

Geothermal energy is thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The geothermal energy of the Earth's crust originates from the original formation of the planet and from radioactive decay of materials