Question

If energy is conserved then why there is an energy crisis?
A.Energy can be lost through heat
B.Different sources of energy can lose their efficiency with time
C.Energy can neither be created nor destroyed, but it does change its form. And not all forms D.of energy are usable and it gets dissipated as heat energy and sound energy.
E.All of the above

Answer 1

Law of conservation of energy states that it can neither be created nor be destroyed. But there are losses of energy and that occurs during the transfer or conversion process of energy. There are renewable sources as well as non-renewable sources of energy and crises occur when there is finishing of non-renewable sources of energy which are limited in number.

Complete step by step answer:
In the question, it is particularly asked about the energy crisis occurring nowadays and we will discuss all the reasons for this even if energy is conserved.
-So, energy has a number of sources like Solar energy, energy from fossil fuels like coal, nuclear material etc. and then we have energy from water (hydropower plant) and energy from wind as well. So, we see that there are energies which are either renewable (which could be used again and again) and non-renewable (which could not be used again and again). In this classification, non-renewable is limited in number and in future they might get finished up. But still renewable sources of energy may continue. The reasons for the crisis could be: -
1.Loss of energy: - It is a true fact according to the law of conservation of energy, that it can neither be created nor be destroyed but, it could be transferred from 1 form to another. So, there are cases in which there is loss of energy during this transfer which is in the form of heat or any other energy.
2.Effective use of sources: - There are a number of sources of energy available but due to human life activities, all the non-renewable sources are depleting at a very fast rate which could lead to great crisis in future.
3.Not all sources are usable: - There are sources of energy which are not effective to use and amount of energy is not released that much like kinetic energy by any natural source. It could be lost in the form of heat or sound as well which has ultimately no use at all.
4.Uses of energy: - In all aspects of life, the energy is used like from mobile phones to electricity generation, every aspect involves use of energy. In mobile phones, the energy is taken from the battery and which gets charged through electricity. In home, electricity comes by energy from thermal power plants (which use coal to produce energy). In solar panels, energy produced from sun rays.
So, we conclude that even though it cannot be created nor be destroyed, but still there is loss of energy (because during transfer there are losses in different forms) in form of either sound, heat etc. and also there is human factor is majorly involved for the crisis of energy and if not properly utilized, we may see big crisis in future.

So, the correct answer is C

Note:
Even though the other options are correct of their own but they are not the major reasons for the energy crisis. There are a number of steps that are being taken to promote the use of renewable sources of energy like use of CNG instead of petrol, use of Biogas instead of methane gas and there are many. So, it is good to go towards renewable sources of energy to avoid such a crisis in future.