To what use sonar is put? Explain clearly.

What is a sonar?

(i) Figure shows the input waveform which is converted by a device .X. into an output wavefrom. Mane the device and explain its working using the proper circuit. (ii) Draw the forward bias and reverse blas circuit for the basic component of the device and draw the characterstics. Explain clearly which region of the curve is used in an amplifier.

Draw the labelled circuit diagram of a common-emitter transistor amplifier : Explain clearly how the input and output signals are in opposite phase.

Draw the tramsfer characteristic curve of a base biased transistor in CE configuration. Explain clearly how the active region of the V_o" versus " V_i curve in a transistor is used as an amplifier.

DNA and RNA are the information molecules of the cell. Explain clearly the differences in the basic structure of these two molecules.

What is somatic hybridisation? Explain the various steps involved in the process. Mention any two uses of somatic hybridisation

In the contact process for industrial manufacture of sulphuric acid, some amount of sulphuric acid is used a starting material. Explain briefly. What is the catalyst used in the process?

LiOH has been used by astronauts. Explain the use with the help of reaction.

Explain what is chemical energy. To what uses is this energy put ?

If we put a cardboard (say 20 cm xx 20 cm) between a light source and our eyes, we can't see the light. But when we put the same cardboard between a sound source and our ear, we hear the sound almost clearly, Explain.