Which one of the Following is a universal gate?

50) Which one of the following is an advantage of forging?

51) 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