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प्रश्न
Fill in the blank
Coal, petroleum, and natural gas are _________fuels.
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उत्तर
Coal, petroleum, and natural gas are fossil fuels.
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संबंधित प्रश्न
What are the disadvantages of fossil fuels?
Fill in the following blank with a suitable word:
The amount of heat produce by burning a unit mass of a fuel completely is known as its ............ value.
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
Explain why, natural gas is considered to be a good fuel.
Fill in the following blank with suitable word:
Biomass is another form in which ........... energy manifests itself.
Name the biomass which is still widely used as a source of heat energy in many household of our country.
What are the two ways in which cow-dung can be used as a fuel? Which of them is better and why?
The gravitational pull of the moon cause the sea-water to rise periodically.
(a) What name is given to the condition of the sea when water to rise periodically.
(b) What name is given to the condition of the sea when its raised water recedes?
(c) What name is given to the energy which can be harnessed from this natural phenomenon?
(d) Draw labelled diagram to show how this energy can be harnessed from this natural
The world's known coal reserves are expected to last for about:
(a) 200 years
(b) 400 years
(c) 500 years
(d) 100 years
State whether the following is True or False.
Coal and petroleum are renewable energy resources.
State whether the following is True or False.
Renewable energy resources have limited supply in nature.
State whether the following is True or False.
Coal takes millions of years to form.
State whether the following is True or False.
The Sardar Sarovar Dam is built on the river Narmada.
What are fossil fuels?
Who is the odd one out?
Why should we conserve the non-renewable sources of energy?
Explain why is it no wise to regard wood as a renewable sources of energy.
Sunlight and air are inexhaustible natural resources. Comment.
Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.
