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प्रश्न
Who is the odd one out?
विकल्प
Leaving the fan on in a vacant room
Leaving the TV on while working
Using AC during winter
Putting off the light when going out
उत्तर
Putting off the light when going out
Explanation:
Putting off the light when going out is the odd one out as it is one of the measures of saving energy. The rest involves waste of energy.
संबंधित प्रश्न
What is meant by a renewable source of energy? Give two examples of renewable sources of energy.
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
The natural gas consists mainly of:
(a) methane
(b) ethane
(c) propane
(d) butane
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 is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?
The constituent of biogas which makes it an excellent fuel is:
(a) butane
(b) methane
(c) propane
(d) ethane
Can you tell?
Which forms of energy from the sun are used in solar energy devices?
What is non-renewable resources?
Why petrol is exhaustible natural resource whereas sunlight is not? Explain.
Complete the crossword in figure with the help of the clues :
Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
5. The substance obtained by carbonisation. (4)
6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
