57) Pyrometer is used to measure

58) A pre-Stressed concrete pile is

59) A candidate who get 20 % marks in the examination fails by 30 marks but another candidate gets 32% marks gets 42 marks more than the minimum pass marks. The pass percentage is

60) Aruna cuts a cake into two halves and cuts one half into smaller pieces of equal size. Each of the small pieces is twenty grams in weight. If she has seven pieces of the cake in all with her, how heavy was the original cake?

61) Deforestation has an alarming effect on