ANS:A - have been waiting

No answer description is available. 

ANS:A - 6

Here argv[1], argv[2] and argv[3] are string type. We have to convert the string to integer type before perform arithmetic operation. Example: j = atoi(argv[1]) + atoi(argv[2]) + atoi(argv[3]);

ANS:E - both (b) and (c).

The given answer is absolutely right, first reading means the back sight-reading, so when the first reading (back sight-reading) is more than the second reading (foresight reading) it represents a rise and vice versa for fall. For the same set up of instrument, staff reading is more at a lower point (depression) and less for a higher point (hill). Thus, staff reading provides information regarding the relative rise and fall of ground points. This provides the basics behind rising and fall method for finding out the elevation of unknown points.

In above given all options explain wrongly:

* Second reading more than first -fall.
* First reading is more than second-fall.
* First reading is less than second-rise.
* Second reading is less than first-rise. For example:

You took Back sight reading on staff A (imagine it was 1. 6 m) then you took foresight reading on staff B (Imagin it was 1. 8m). It means your staff B is in depression area because it shows more reading as compared Staff A through the instrument.

So if B. S level is less than F. S it means RISE.

And if B. S level is more than F. S it means FALL. B and C are correct because if the instrument is sighted to A and B from the same position then if the staff reading of A is higher than B then it shows that A is in lower elevation because the staff at A will be at the position lower than that of B.

So from the same instrument, the reading of A will be higher.

ANS:A - nickel

Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray solid that is lightweight and relatively strong. In terms of its applications in steel, magnesium is not typically added as an alloying element to enhance the strength of steel at elevated temperatures. Magnesium is more commonly used in aluminum alloys, where it contributes to the alloy's strength and corrosion resistance. In steelmaking, the most common alloying elements for enhancing strength at elevated temperatures include nickel, chromium, molybdenum, and vanadium. These elements form various intermetallic compounds and solid solutions within the steel matrix, improving its mechanical properties at high temperatures. While magnesium can be added to certain steel grades for specific purposes, such as deoxidation or grain refinement, it does not significantly contribute to the high-temperature strength of steel. Therefore, it is not typically used for this purpose in steel manufacturing processes.