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प्रश्न
Choose the correct answer.
Windmills have been used for many centuries in
विकल्प
the USA
the Netherlands
Russia
India
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उत्तर
Windmills have been used for many centuries in the Netherlands
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संबंधित प्रश्न
What are the disadvantages of fossil fuels?
"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean?
A good fuel is one which possesses:
(a) high calorific value and low ignition temperature
(b) high calorific value and high ignition temperature
(c) high calorific value and moderate ignition temperature
(d) low calorific value and moderate ignition temperature
Which of the following fuels has the highest calorific value?
(a) natural gas
(b) methane gas
(c) hydrogen gas
(d) biogas
What are the disadvantages of burning fossil fuels?
Write a short note on the pollution caused by burning fossil fuels.
Why is LPG considered a good fuel?
LPG consists mainly of:
(a) butane
(b) ethane
(c) butanone
(d) methane
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
Which of the following sources of energy are not derived from the sun?
Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy
Describe the construction and working of a biogas plant with the help of a labelled diagram.
The non-renewable source of energy among the following is:
(a) hydroelectricity
(b) sewage gas
(c) natural gas
(d) gobar gas
Which produced of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?
Name five renewable and three non-renewable sources of energy.
Renewable source of energy is :
State whether the following is True or False.
Renewable energy resources have limited supply in nature.
State whether the following is True or False.
The Sardar Sarovar Dam is built on the river Narmada.
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ______ in low lying wetland areas. Due to natural processes like ______, these forests got buried under the ______. As more ______ deposited over them, they were compressed. The ______ also rose as they sank deeper and deeper. Under high ______ and high ______, dead plants got slowly converted into coal.
