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Indian Navy SSR Sources of Energy — practice questions

Explore 4 free Sources of Energy questions in Indian Navy SSR 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 1–4 of 4.

The role of the glass sheet in a solar cooker is to:Read the answer and worked solution →Why are reflectors used in a solar cooker?Read the answer and worked solution →Compared with a fossil-fuel plant of the same output, a hydroelectric plant has:Read the answer and worked solution →Which is the ultimate source of energy in the wind?Read the answer and worked solution →

Worked practice questions

The role of the glass sheet in a solar cooker is to:

  1. Trap heat by greenhouse effect
  2. Reflect sunlight away
  3. Reduce dust
  4. Make the cooker waterproof
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Correct answer: A. Trap heat by greenhouse effect

1. The glass sheet covers the top of the solar cooker. 2. Sunlight passes through the glass and is absorbed inside. 3. The absorbed energy is re-emitted as longer-wavelength infrared radiation. 4. The glass blocks the outgoing infrared, trapping the heat (greenhouse effect). 5. So the glass sheet retains heat inside the cooker. _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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Compared with a fossil-fuel plant of the same output, a hydroelectric plant has:

  1. Higher pollution
  2. No moving parts by common convention
  3. Higher fuel cost
  4. Lower fuel cost and lower air pollution
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Correct answer: D. Lower fuel cost and lower air pollution

1. A hydroelectric plant uses falling water, which is free and continuously replenished. 2. There is no combustion, so no CO2 or other air pollutants are emitted. 3. Fossil plants must buy fuel and release pollutants. 4. So hydroelectric plants have lower fuel cost and far less air pollution. 5. The main hydro drawback is ecological disruption from large dams. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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