Basic Computer: Memory Units MCQ — 15 Practice Questions with Answers

Explanation

In basic computer memory units, the commonly taught binary-based chain is 1 KB = 1024 bytes, 1 MB = 1024 KB and 1 GB = 1024 MB. The cue in the stem is the usual memory-unit conversion, so the immediate step from byte to kilobyte is required. Option A states that relationship exactly. Options C and D wrongly skip levels by comparing MB or GB directly with bytes.

Explanation

Binary numbers use powers of 2 from right to left: 1, 2, 4, 8 and so on. To represent decimal 13, select the values 8, 4 and 1, because 8 + 4 + 1 = 13. The 2's place is not needed. Therefore the bits from the 8's place to the 1's place are 1, 1, 0 and 1, giving 1101. The other options represent 11, 14 or 9, so they do not match the decimal number in the stem.

Explanation

Computers work internally with electrical states, which are represented logically as binary 0 and 1. Therefore, Statement I is correct. Characters such as letters, digits and symbols also need representation inside the computer. ASCII is a standard character coding system that assigns numeric codes to such characters. Therefore, Statement II is also correct. Since both statements are independently true, the correct option is both Statement I and Statement II.

Explanation

The assertion says that 4 GB can be expressed as 4096 MB. In the memory-unit convention used in basic computer courses, 1 GB equals 1024 MB. Applying that conversion, 4 GB = 4 × 1024 MB = 4096 MB. Thus the assertion is true. The reason is also true and gives the exact rule used to derive the assertion. Therefore, both A and R are true, and R correctly explains A.

Explanation

Hexadecimal is a base-16 number system. Four binary bits can make 16 different patterns, from 0000 to 1111. A single hexadecimal digit also has 16 possible values, so each group of 4 bits can be written as one hexadecimal digit. This is why hexadecimal is useful for showing binary data in a shorter form, especially in memory addresses and machine-level values. Therefore the assertion is true, the reason is true, and the reason correctly explains the assertion.