Advertisements
Advertisements
Question
An energy efficient devices for producing light is:
(a) DLF
(b) CFL
(c) FCL
(d) LPG
Solution
CFL
A compact fluorescent lamp (CFL) is an energy-efficient device. It consumes much less electrical energy than other devices that provide light.
APPEARS IN
RELATED QUESTIONS
Compare and contrast fossil fuels and the Sun as direct sources of energy
Classify the following
Coal, Wind, Tides, Petroleum,Wood, Natural gas
What is the basis of above classification?
The main constituent of petroleum gas is:
(a) methane
(b) ethane
(c) butane
(d) propane
What should be the minimum wind speed for the satisfactory working of a wind-powered electric generator?
Suggest a safe and efficient method for the disposal of biowastes and sewage materials. How is this method advantageous to us?
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
The fuel which is not obtained from biomass is:
(a) firewood
(b) cow-dung cakes
(c) coke
(d) charcoal
Choose the correct answer.
Windmills have been used for many centuries in
State whether the following is True or False.
Coal takes millions of years to form.
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.