8) Out of four numbers, the average of first three is 16 and that of the last three is 15. If the last number is 18, then the first number is

9) Two elements that are frequently used in making transistors are

10) Harmonic distortion in amplifiers is due to

11) Which disease is often referred as "Royal Disease"?

12) In the third battle of Panipat, the Marthas were defeated by the