54) Two electric bulbs of 50 watts and 100 watts are given. Which one of the two bulbs will be brighter when they are connected in series to the mains

55) Full wave Rectifier has theoretical maximum efficiency of

56) Smita, Monica and Reema can type a 50 page document in 4 hrs, if they work together Smita herself can type it in 12 hrs and Reema can do it in 10 Hours. Monica alone can type it in

57) Pyrometer is used to measure

58) A pre-Stressed concrete pile is