Which of the following does not represent an I/O device?

1. Speaker which beeps
2. Plotter
3. Joystick
4. ALU

Which of the following is a correct definition of volatile memory?

1. It loses its contents at high temperatures
2. It is to be kept in airtight boxes
3. It loses its contents on failure of power supply
4. It does not lose its contents on failure of power supply

Large amounts of cheques are processed by using …………… .

1. OCR
2. MICR
3. OMR
4. All of the above

The concentric circles on the floppy disk are further divided into :

1. Tracks
2. Sectors
3. Cylinders
4. None of the above