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प्रश्न
Choose the correct answer.
Windmills have been used for many centuries in
पर्याय
the USA
the Netherlands
Russia
India
उत्तर
Windmills have been used for many centuries in the Netherlands
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संबंधित प्रश्न
What is the difference between a renewable and a non-renewable source of energy? Explain with examples.
The fuel having the lowest calorific value is:
(a) coal
(b) wood
(c) charcoal
(d) kerosene
Calorific value and ignition temperature of fuel X are 75 kJ/g and 20°C respectively. These values for fuel Y are 50 kj/g and 75°C respectively. On burning, the fuel Y produces only CO2while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.
Name any one hydrocarbon fraction obtained during the fractional distillation of petroleum which is used as a domestic fuel.
Name the component which is found in natural gas well as in biogas.
State one important use of CNG these days.
Explain how, sun is considered to be the ultimate source of fossil fuels
Which fossil fuels were formed by the buried remains of small plants and animals?
Which of the following is not a fossil source of energy?
(a) kerosene oil
(b) cow-dung cakes
(c) CNG
(d) coal
Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy.
Name the element X.
The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.
Name the device
What type of nuclear reaction is responsible for the liberation of energy:
in the sun?
Which of the following is ultimately not derived from the sun's energy (or solar energy)?
(a) wind energy
(b) nuclear energy
(c) biomass energy
(d) ocean thermal energy
Which of the two is more energy efficient: filament type electric bulb or CFL? Why?
Fill in the blank
_______is the coal with the highest percentage of coal.
Can you tell?
What are the non-conventional energy resources?
Explain why is it no wise to regard wood as a renewable sources of energy.
Choose the incorrect statement regarding wind power
Fill in the blanks in the following sentence.
Coal is one of the ______ used to cook food.
Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think survival of living beings would be possible? If yes, why? If not, why not?
