What is Energy ?

• Energy— Carbohydrate, protein and fat are main energy producing food substances. Oxygenationof these provides energy. This energy is used for various functions and processes of the body. Energy is required for voluntary activities like running, walking, sleeping, cooking etc. and for involuntary activities like breathing, blood circulation, heart beating, etc. Calorie is the unit of heat energy.

Energy —

• Kilocalorie is the energy needed to raise the temperature of 1 kilogram of water through 1 °C, equal to one thousand small calories.
• Oxygenation of 1 gram carbohydrate and protein gives 4 kilocalories of energy and that of 1 gram fat gives 9 kilocalories of energy.
• The excess of energy in food causes obesity, increase in weight, other diseases such as diabetes, high blood pressure, heart diseases, etc. Working capacity is also adversery affected.
• Deficiency of energy causes weight loss, loss of activity, effect on physical growth, etc.

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Energy Questions and Answers :-

1. Energy can neither be created nor destroyed but still everybody discuss about the energy crisis because
(a) Energy transform into different form continuously.
(b) Usable form of energy is dissipated to the surroundings in less usable forms.
(c) Energy is consumed and cannot be used again.
(d) All of these

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2. An ideal source of energy should have
(a) higher calorific value
(b) easy transportability
(c) easy accessibility
(d) All of these

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3. Fossile fuels are
(a) non-renewable source of energy
(b) renewable source of energy
(c) both (a) and (b)
(d) Neither (a) nor (b)

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4. Dead organisms are transformed into petroleum and natural gas in
(a) presence of air
(b) absence of air
(c) presence of sunlight
(d) none of the above

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5. Which of the following problem is associated with a burning of coal?
(а) Carbon-dioxide emission
(b) acid rain
(c) ash with toxic metal supurity
(d) all of these.
Ans. ⇒ ????