UGC NET Questions (Paper – 1)

In computer systems, data is stored and measured in binary-based units. The smallest unit is a bit, and eight bits form a byte. Traditionally, one kilobyte is taken as 1024 bytes because it corresponds to 2¹⁰ in binary, which is convenient for addressing. Therefore, the relationship given in this option correctly reflects the typical ICT convention.

Option A:
This option drastically underestimates the size of a kilobyte by stating only 10 bytes. Such a small value does not align with any standard in data measurement. It ignores the binary nature of computer memory and is mathematically incorrect.

Option B:
This option uses 100 bytes for a kilobyte, which might imitate decimal scaling but does not match computer architecture. In ICT, kilobyte is not defined as 10² bytes in most contexts. Hence, the value is inaccurate for understanding real storage capacities.

Option C:
This option confuses kilobytes with megabytes and gigabytes by assigning an extremely large value of 1024 megabytes to one kilobyte. In reality, 1024 megabytes equal one gigabyte, not one kilobyte. Thus, it completely misrepresents the storage hierarchy.

Option D:

Statements A, C and D correctly describe data storage units in the binary system used in many ICT contexts. Kilobyte is commonly approximated as 1024 bytes when referring to memory, and a gigabyte is conventionally treated as 1024 megabytes in the same binary sense. A bit is indeed the smallest unit of data in a computer. Statement B is wrong because one megabyte is smaller, not larger, than one gigabyte, so the correct set of true statements is A, C and D only.

Option A:
Option A is incorrect because it includes only statements A and C while omitting D. Statement D is also true, as one gigabyte is usually taken as 1024 megabytes when using binary-based measurement. Excluding a true statement leads to an incomplete identification of correct statements.

Option B:
Option B is correct because it groups exactly the true statements A, C and D. Together they explain the hierarchical relationship between bit, byte, kilobyte, megabyte and gigabyte in ICT. No false statement is included in this combination, which matches the requirement to select all correct statements.

Option C:
Option C is incorrect because it includes B, C and D as correct. While C and D are true, statement B is false since an MB is smaller than a GB. Incorporating a false statement into the combination means this option cannot be accepted.

Option D:
Option D is incorrect because it assumes that all four statements are correct. Statement B incorrectly reverses the size relationship between megabyte and gigabyte. Since a single false statement is enough to disqualify the combination, this option is not correct.

Statements A, B and D are correct descriptions of how data is represented in binary form in ICT. The binary system does use only the digits 0 and 1, each digit is called a bit, and a byte is generally made up of eight bits. Statement C is wrong because the decimal system is base 10, not base 2. Therefore, the combination that includes A, B and D but excludes C is the correct answer.

Option A:
Option A is correct because it contains exactly the true statements A, B and D. It correctly identifies the digits of the binary system, the term for each binary digit and the usual size of a byte. By excluding the false statement about the decimal system being base 2, it reflects proper understanding of number systems.

Option B:
Option B is incorrect because it omits statement D while including only A and B. Although A and B are true, D is also correct regarding a byte being 8 bits. Since one correct statement is left out, this option does not capture the full set of true statements.

Option C:
Option C is incorrect because it includes statement C along with B and D. Statement C incorrectly labels the decimal system as base 2, so including it mixes true and false information. A valid combination must exclude this incorrect statement.

Option D:
Option D is incorrect because it assumes all four statements are correct. By including statement C, which misrepresents the base of the decimal system, this option fails to meet the requirement of containing only accurate statements.