The keyboard , mouse, display and system unit are?
1.Hardware.
2.output device.
3.storage device.
4. software

The term__refers to data storage system that make it possible for a computer or electronic device to store and retrieve data.

Statement/ : I. All keyboards are mouse. II. Some mouse are printer. Conclusion/ : 1. No printer is keyboard. 2. Some printers are mouse. 3. All printers are mouse. 4. No keyboards are printer.

A: A system displaying a hysteresis loop such as a ferromagnet, is a device for stroing memory. R: Magnelisation of a ferromagnet is not a single valued fungtion of the magnetising field rather it depends both on the field and also on history of magnetization.

Statements: No hardware is software. Some software is keyboard. All mouse are software Conclusions: (I) No mouse is a hardware (II) Some hardware are mouse

A water cooler of storages capacity 120 liters can cool water at a constant rate of P watts. In a closed circulation system (as shown schematically in the figure), the water from the cooler is used to cool an external device that generates constantly 3kW of heat (thermal load). The temperature of water fed into the device cannot exceed 30^@C and the entire stored 120 liters of water is initially cooled to 10^@C. The entire system is thermally insulated. The minimum value of P ( in watts) for which the device can be operated for 3hours is (Specific heat of water is 4.2kJkg^-1K^-1 and the density of water is 1000kgm^-3 )