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Indian Navy 10+2 B.Tech Cadet Sources of Energy — practice questions

Explore 5 free Sources of Energy questions in Indian Navy 10+2 B.Tech Cadet Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Sources of Energy questions and exercises with answers

Showing questions 1–5 of 5.

Which is a fossil fuel?Read the answer and worked solution →Biogas is mainly composed of:Read the answer and worked solution →Why are reflectors used in a solar cooker?Read the answer and worked solution →Which of the following is NOT a non-conventional source?Read the answer and worked solution →Wind farms require all of the following EXCEPT:Read the answer and worked solution →

Worked practice questions

Which is a fossil fuel?

  1. Wood
  2. Coal
  3. Hydrogen
  4. Biogas
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Correct answer: B. Coal

1. Fossil fuels formed from buried organic matter under heat and pressure. 2. Coal, petroleum and natural gas are the classic fossil fuels. 3. Wood is a biomass fuel; hydrogen and biogas are not fossil fuels. 4. So coal is the fossil fuel here. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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Biogas is mainly composed of:

  1. Acetylene
  2. Ethanol
  3. Hydrogen
  4. Methane
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Correct answer: D. Methane

1. Biogas is produced by anaerobic decomposition of organic matter. 2. The dominant gas formed is methane (CH4). 3. Smaller amounts of CO2 and hydrogen sulphide are also present. 4. So biogas is mainly methane. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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Why are reflectors used in a solar cooker?

  1. To absorb infrared rays
  2. To focus sunlight onto the cooker
  3. To cool the cooker
  4. To prevent dust accumulation
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Correct answer: B. To focus sunlight onto the cooker

1. The cooker receives more solar energy than the direct overhead beam alone. 2. Reflectors are mirrors mounted around the cooker. 3. They catch sunlight from angles and reflect it onto the cooker. 4. The cooker therefore receives a more intense beam. 5. So reflectors concentrate sunlight onto the cooker. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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