UGC NET Questions (Paper – 1)

In hexadecimal notation, digits 0–9 represent their usual decimal values 0 to 9. After 9, the letters A, B, C, D, E and F represent decimal values 10 to 15. Specifically, A stands for decimal 10. Therefore, the correct mapping for 'A' in hex is 10.

Option A:
Option A gives 9, which is already represented in hexadecimal by the digit '9'. There is no need to reuse this value for 'A'. Hence 9 cannot be the value of 'A'.

Option B:
Option B assigns the value 11, which in hexadecimal is actually represented by the letter 'B'. Thus 11 corresponds to 'B' and not to 'A'. Choosing 11 would misalign the standard hex digit sequence.

Option C:
Option C is correct because in hexadecimal the sequence after 9 goes A=10, B=11, C=12, D=13, E=14 and F=15. This convention is internationally accepted and used in computing. Therefore 'A' must correspond to 10.

Option D:
Option D corresponds to 12, which is represented in hexadecimal by the letter 'C'. Confusing 'A' with this value would break the standard mapping and cause errors in conversions.