Quote:
Originally Posted by mashal rana
i think u got confused because parsec is basically a unit of length but used to measure distance of stars as used in astronomy so hope it would be clear
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Well Brother
length is the measure of distance so when you say its unit of length it actually measures distance so those who opted for the option d they have scored 1 mark for their right answer.
Now come to another argued item
Work without expanditure of energy is impossible so the right option is no
because no machine is there to work wihtout consumption of energy
Input = Output means 100% efficiency
so even if we neglect the concept of energy dissipation even then we have to provide energy to get the work done. One of the member has mentioned that some jets are using solar energy so dear brother even its form of energy.