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4. Which of the following has a scroll wheel?

(i) (ii)

(iii) (iv)

5. Choose the device that is used for typing letters and numbers.

(i) (ii)

(iii) (iv)

B. Fill in the blanks using the given hints:

1. CPU is the of a computer.
Hints
2. is used to type letters, numbers and symbols. Mouse

Keyboard
3. A mouse has buttons. Two

4. Monitor everything you do on the computer. Displays
Brain
5. is used to point and select items on the monitor

screen.

Building Blocks of a Computer 27