Which of the following statements are correct?

1.One KB has 1024 bytes.

2.Cache memory is a secondary storage.

3.Operating system is not an application software.

4.Hub is a network device.

5.ALU is a control unit.

A1, 4 & 5 only

B1, 2 & 3 only

C1, 3 & 4 only ✓ Correct

D3, 4 & 5 only

Correct answer: (C) 1, 3 & 4 only

Explanation

Statement 1 is correct because one kilobyte equals 1024 bytes.

Statement 3 is correct because an operating system is system software, not application software.

Statement 4 is correct because a hub is a network device that connects computers.

Statement 2 is wrong because cache memory is fast primary memory, not secondary storage.

Statement 5 is wrong because the ALU performs arithmetic and logic, while the control unit is separate.

The CPU contains both the arithmetic logic unit and the control unit working together.

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