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प्रश्न
Fill in the blank
Solar cells use the power supplied by the ______.
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उत्तर
Solar cells use the power supplied by the Sunlight.
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संबंधित प्रश्न
Why are fossil fuels classified as non-renewable source of energy?
Classify the following into renewable and non-renewable sources of energy:
Coal, Wind, Tides, Petroleum,Wood, Natural gas
An examples of a renewable source of energy is:
(a) petrol
(b) natural gas
(c) biogas
(d) kerosene
Which of the following is not a renewable source of energy?
(a) wind
(b) flowing water
(c) fossil fuels
(d) fuel wood
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
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.
What are the various fuels which are used to generate electricity in a thermal power plant?
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Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy.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.
Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy.
Name another element which is usually found in combination with X in fossil fuels.
How long are the energy resources of the earth like coal, petroleum and natural gas expected to last?
Name a few major producers of petroleum in the world.
Describe the four major types of coal.
Who is the odd one out?
Choose the incorrect statement regarding wind power
What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non-conventional sources of energy.
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
Write True/False against the following statement.
Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
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.
