Which of the following statements about a refrigerator is/are correct?
1.It converts electrical energy into heat energy.
2.It converts electrical energy into mechanical energy.
3.It transfers heat from a high temperature to a low temperature.
4.It transfers heat from a low temperature to a high temperature.

A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?

Consider the following statements:
In a nuclear reactor, self-sustained chain reaction is possible, because
1.more neutrons are released in each of the fission reactions.
2.the neutrons immediately take part in the fission process.
3.the fast neutrons are slowed down by graphite.
4.every neutron released in the fission reaction initiates further fission.Which of these statements are correct?

When water is heated form 0°C to 10° C. Its volume

It S denotes sound energy, E denotes electrical energy and M denotes magnetic energy, the correct representation of recording and reproduction in an audio tape recorder is

When light waves pass from air to glass, the variables affected are

Consider the following features of newer models of motor cars
1.Radial tyres
2.Streamlined body
3.Multipoint fuel injection
4.Catalytic converter with exhaust 
Which of these features make the new models of motor cars more fuel efficient?

When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of

Which one of the following does a TV remote control unit use to operate a TV set?

Which of the following waves can propagate in a vacuum?
1.Radio waves
2.Light waves
3.X-rays
4.Ultrasonic waves
Select the correct answer using the codes given below