# Electronics and Communication Engineering - Microprocessors

### Exercise :: Microprocessors - Section 3

46.

Which of the following is not a valid real constant?

 A. -73.1 B. 10251,3 C. 10.23 D. -5.7381

Explanation:

Comma is not allowed in real constant.

47.

Consider the expression b = acd (xz). The correct C statement for above expression is

 A. a c d (x * z) B. a* c* d* (x z) C. a * c * d (x * z) D. None of the above

Explanation:

All operators must be written explicity in C.

48.

Which is a valid Java variable?

 A. 1 a b B. 56 a C. a 56 D. 5 a 6

Explanation:

In all others first letter is not lower case.

49.

When we use `RRC` instruction once in 8085, the number is

 A. multiplied by 2 B. divided by 2 C. multiplied by 4 D. divided by 4

Explanation:

When RRC is used once the number is divided by 2.

50.

1. If A and B are sets then A + B denotes union of sets A and B.
2. The union of A and B is that set whose elements are in either A or B or both.
3. If A and B are sets, then difference of sets A and B is denoted by A - B.
4. A - B in the set obtained by removing elements of A from B.
Which of the above are true?

 A. All B. 1, 2 and 3 only C. 2 and 3 only D. 1 and 4 only