Air pollution effects on plants are mostly found on

52) A worker is engaged for 30 days on the condition that he will be paid Rs. 75 for each day he works but if he is absent, he will not get daily wages but also be fined Rs. 22.50 for that day. At the end of 30 days, the employee paid the worker Rs. 1275 in al

53) Advantages of D.C. over A.C. is

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