Question

Ravi was using calculator to do some calculations. While doing so his calculator stopped working. He kept the calculator near the window for some time, exposed to sunlight. After some time he could use the calculator again. His friend Mohit who was using a battery operated calculator, watched him and told him that his calculator was better in the sense that he could immediately recharge calculator, by charging battery but Ravi was not convinced. He explained to Mohit the advantages of solar calculator and convinced him to adopt it. (a) State the values exhibited by Ravi. (b) List the advantages of using a calculator driven by solar energy which convinced Mohit too to adopt it

Answer 1

a) care for environment ; encouraging people to save it

b)1. It uses conventitional energy i.e. solar energy

2.It save energy and money too

3.it reduces wastage of cell.