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1.  
1.5 GB is equal to how many KB?

Correct Answer: A [15,72,864]

Explanation:

1.5 × 1,024 × 1,024 = 15,72,864 KB.

2.  
Three files are 512 KB, 1.5 MB and 2,048 KB. Their total size is:

Correct Answer: C [4 MB]

Explanation:

0.5 MB + 1.5 MB + 2 MB = 4 MB.

3.  
How many photos of 256 KB each can be stored in 64 MB?

Correct Answer: D [256]

Explanation:

64 × 1,024 = 65,536 KB; ÷ 256 = 256 photos.

4.  
Consider the following statements about the memory hierarchy:
I. Cache is faster than RAM.
II. Magnetic tape is faster than a hard disk.
III. Registers are the fastest memory in a computer.
Which of the statements given above is/are correct?

Correct Answer: C [Only I and III]

Explanation:

I true; II false – tape is the slowest; III true.

5.  
Reverse question: a byte-addressable memory of 4 GB is fully addressed by an address bus of how many bits?

Correct Answer: E [32]

Explanation:

4 GB = 2² × 2³⁰ = 2³² bytes → 32 address lines.

6.  
Arrange in increasing order of speed: Cache, Magnetic tape, RAM, Registers, Hard disk

Correct Answer: B [Magnetic tape < Hard disk < RAM < Cache < Registers]

Explanation:

Slowest tape → disk → RAM → cache → registers (Closer is Quicker).

7.  
Odd one out:

Correct Answer: C [RJ-45]

Explanation:

RJ-45 is a network connector; the others carry video to a display.

8.  
Spot My Mistake: "A 32 GB pen drive holds 32 × 1,000 × 1,000 × 1,000 bytes, so it holds 32 × 1,024 MB exactly." What is wrong?

Correct Answer: B [The first part uses decimal units but the second uses binary units, so they do not agree]

Explanation:

32 × 10⁹ bytes ≠ 32 × 1,024 MB (= 32 × 2³⁰ bytes); mixing decimal and binary prefixes is the error.

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