Chapter 14

āĻ…āϧ্āϝাāϝ় ā§§ā§Ē

 Sources of Energy

āĻļāĻ•্āϤিā§° āĻ‰ā§ŽāϏ

EXERCISES 

āĻŦ্āϝাāϝ়াāĻŽ 

1. A solar water heater cannot be uses to get hot water on 

ā§§/ āĻ—ā§°āĻŽ āĻĒাāύী āϞāĻ—াāĻŦāϞৈ āϏৌā§° ā§ąাāϟাā§° āĻšিāϟাā§° āĻŦ্āĻ¯ā§ąāĻšাā§° āϕ⧰িāĻŦ āύোā§ąাā§°ি

(a) a sunny day.                 (b) a cloudy day. 

(āĻ•) āĻāϟা ā§°’āĻĻāϘাāχ āĻĻিāύ।      (āĻ–) āĻāϟা āĻĄাā§ąā§°ীāϝ়া āĻĻিāύ।

(c) a hot day.                     (d) a windy day.

(āĻ—) āĻāϟা āĻ—ā§°āĻŽ āĻĻিāύ।          (āϘ) āĻŦāϤাāĻšā§° āĻĻিāύ।

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2. Which of the following is not an example of a bio-mass energy source?

⧍) āϤāϞ⧰ āĻ•োāύāϟো āϜৈā§ą-āĻ­ā§° āĻļāĻ•্āϤিā§° āĻ‰ā§ŽāϏ⧰ āωāĻĻাāĻšā§°āĻŖ āύāĻšāϝ়?

 (a) wood                                   (b) gobar-gas

(āĻ•) āĻ•াāĻ                                     (āĻ–) āĻ—োāĻŦā§°-āĻ—েāĻ›

 (c) nuclear energy                    (d) coal

(āĻ—) āĻĒাā§°āĻŽাāĻŖā§ąিāĻ• āĻļāĻ•্āϤি              (āϘ) āĻ•āϝ়āϞা

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3. Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun's energy?

ā§Š/ āφāĻŽি āĻŦ্āĻ¯ā§ąāĻšাā§° āϕ⧰া āĻļāĻ•্āϤিā§° āĻŦেāĻ›িāĻ­াāĻ— āĻ‰ā§ŽāϏāχ āϏংā§°āĻ•্āώিāϤ āϏৌā§°āĻļāĻ•্āϤিāĻ• āĻĒ্ā§°āϤিāύিāϧিāϤ্āĻŦ āϕ⧰ে। āϤāϞ⧰ āĻ•োāύāϟো āĻļেāώāϤ āϏূā§°্āϝ্āϝ⧰ āĻļāĻ•্āϤিā§° āĻĒā§°া āφāĻšā§°āĻŖ āϕ⧰া āύāĻšāϝ়?

 (a) geothermal energy           (b)wind energy

(āĻ•) āĻ­ূāϤাāĻĒীāϝ় āĻļāĻ•্āϤি                 (āĻ–)āĻŦাāϝ়ু āĻļāĻ•্āϤি

 (c) nuclear energy                (d) bio-mass.

(āĻ—) āĻĒাā§°āĻŽাāĻŖā§ąিāĻ• āĻļāĻ•্āϤি           (āϘ) āϜৈā§ąāĻŦāϏ্āϤু।

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4. Compare and contrast fossil fuels and the Sun as direct sources of energy.

ā§Ē) āϜীā§ąাāĻļ্āĻŽ āχāύ্āϧāύ āφ⧰ু āϏূā§°্āϝ্āϝāĻ• āĻļāĻ•্āϤিā§° āĻĒ্ā§°āϤ্āϝāĻ•্āώ āĻ‰ā§ŽāϏ āĻšিāϚাāĻĒে āϤুāϞāύা āφ⧰ু āĻŦিāĻĒā§°ীāϤāĻŽুāĻ–ী āϕ⧰া।

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5. Compare and contrast bio-mass and hydro electricity as sources of energy.

ā§Ģ) āϜৈā§ą-āĻ­ā§° āφ⧰ু āϜāϞāĻŦিāĻĻ্āϝুā§Ž āĻļāĻ•্āϤিā§° āĻ‰ā§ŽāϏ āĻšিāϚাāĻĒে āϤুāϞāύা āφ⧰ু āĻŦিāĻĒā§°ীāϤāĻŽুāĻ–ী āϕ⧰া।

 Ans-


 6. What are the limitations of extracting energy from

ā§Ŧ/ āĻļāĻ•্āϤি āφāĻšā§°āĻŖ āϕ⧰াā§° āĻ•ি āĻ•ি āϏীāĻŽাāĻŦāĻĻ্āϧāϤা āφāĻ›ে

 (a) the wind?        (b) waves?

(āĻ•) āĻŦāϤাāĻš?            (āĻ–) āϤ⧰ংāĻ—?

(c) tides?

(āĻ—) āϜোā§ąাā§°-āĻ­াāϟা?

  Ans-


7. On what basis would you classify energy sources as

ā§­) āφāĻĒুāύি āĻļāĻ•্āϤিā§° āĻ‰ā§ŽāϏāϏāĻŽূāĻšāĻ• āĻ•ি āĻ­িāϤ্āϤিāϤ āĻļ্ā§°েāĻŖীāĻ­ুāĻ•্āϤ āϕ⧰িāĻŦ

 (a) renewable and non-renewable?

(āĻ•) āύāĻŦীāϕ⧰āĻŖāϝোāĻ—্āϝ āφ⧰ু āĻ…āύāĻŦীāϕ⧰āĻŖāϝোāĻ—্āϝ?

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(b) exhaustible and inexhaustible?

(āĻ–) āĻ•্āώāϝ় āφ⧰ু āĻ…āĻ•্āώāϝ়?

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Are the options given in (a) and (b) the same?

(āĻ•) āφ⧰ু (āĻ–)āϤ āĻĻিāϝ়া āĻŦিāĻ•āϞ্āĻĒāϏāĻŽূāĻš āĻāĻ•ে āύেāĻ•ি?

 8. What are the qualities of an ideal source of energy?

ā§Ž) āĻļāĻ•্āϤিā§° āφāĻĻā§°্āĻļ āĻ‰ā§ŽāϏ⧰ āĻ—ুāĻŖ āĻ•ি āĻ•ি?

  Ans-


9. What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

⧝/ āϏৌā§° āĻ•ুāĻ•াā§° āĻŦ্āĻ¯ā§ąāĻšাā§° āϕ⧰াā§° āϏুāĻŦিāϧা āφ⧰ু āĻ…āϏুāĻŦিāϧা āĻ•ি āĻ•ি? āĻāύেāĻ•ুā§ąা āĻ াāχ āφāĻ›েāύে āϝ’āϤ āϏৌā§° āĻ•ুāĻ•াā§°ā§° āωāĻĒāϝোāĻ—িāϤা āϏীāĻŽিāϤ āĻš’āϞāĻšেঁāϤেāύ?

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10. What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?

ā§§ā§Ļ) āĻļāĻ•্āϤিā§° āĻŦā§°্āϧিāϤ āϚাāĻšিāĻĻাā§° āĻĒā§°িā§ąেāĻļā§° āĻ“āĻĒā§°āϤ āĻ•ি āĻ•ি āĻĒā§°িāĻŖāϤি āĻš’āĻŦ? āĻļāĻ•্āϤিā§° āĻŦ্āĻ¯ā§ąāĻšাā§° āĻš্ā§°াāϏ āϕ⧰িāĻŦāϞৈ āφāĻĒুāύি āĻ•ি āĻ•ি āĻĒāĻĻāĻ•্āώেāĻĒ āϞ’āĻŦāϞৈ āĻĒā§°াāĻŽā§°্āĻļ āĻĻিāĻŦ?

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