On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
(a)That source of energy that replenishes in nature is known as a renewable source of energy. Sun, wind, moving water, biomass, etc. The source of energy that does not replenish in nature is known as a non-renewable source of energy. Coal, petroleum, natural gas, etc. are some of the examples of non-renewable sources of energy.
(b)those sources of energy, which will deplete and exhaust after a few hundred years are exhaustible . Coal, petroleum, etc. are the exhaustible sources of energy.Inexhaustible resources of energy are those sources, which will not exhaust in future. These are unlimited. Biomass is one of the inexhaustible sources of energy.
Yes. The options given in (a) and (b) are the same.
Can any source of energy be pollution-free? Why or why not?
What are the limitations of the energy that can be obtained from the oceans?
If you could use any source of energy for heating your food, which one would you use and why?
What is a good source of energy?
Which of the following is not an example of a bio-mass energy source?
(a) wood (b) gobar-gas
(c) nuclear energy (d) coal
What are the disadvantages of fossil fuels?
Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?
Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.
What are the qualities of an ideal source of energy?
Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?
(a) geothermal energy (b) wind energy
(c) nuclear energy (d) bio-mass.
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
What is the importance of DNA copying in reproduction?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
What is ozone and how does it affect any ecosystem?
State two ways to prevent the rusting of iron.
If all the waste we generate is biodegradable, will this have no impact on the environment?
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
When does an electric short circuit occur?
What is meant by saying that the potential difference between two points is 1 V?
What criteria do we use to decide whether something is alive?
How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
Why is vegetative propagation practised for growing some types of plants?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.