(i) Draw a diagram of an illuminated p-n junction solar cell.
(ii) Explain briefly the three processes due to which generation of emf takes place in a solar cell.

State the energy conversion taking place in a solar cell.

(a) What is a solar cell ? Draw the labelled diagram of a solar cell. (b) Name the semi-conductor material which is usually used for making solar cells. (c ) Write the uses of solar cells.

Draw a neat diagram of plant cell and label any three parts which differentiate it from animal cell.

Which of the following events does not take place after the degeneration of the generative cell in pollen grain ?

(a) Draw a schematic diagram of an AC generator. Explain is working and obtain the expression for the instantaneous value of the emf in terms of the magnetic field B, number of turns N of the coil of area A rotating with angular frequency omega . Show how an alternating emf is generated by loop of wire rotating in a magnetic field. (b) A circular coil of radius 10 cm and 20 turns is rotated about its vertical diameter with angular speed of 50 rad s^(-1). in a uniform horizontal magnetic field of 3.0xx10^(-2)T . (i) Calculate the maximum and average emf induced in the coil. (ii) If the coil forms a closed loop of resistance 10 Omega , calculate the maximum current in the coil and the average power loss due to Joule heating.

Read the following four statements (i -iv) (i) Every chromosome essentially has a primary constriction or the centromere. (ii) During different stages of cell division, cells show structured chromosomes in place of the nucleus . (iii) Nuclear pores are the passages through which movement of RNA and Protein takes place in one direction between the nucleus and cytoplasm. (iv) Chromatin contains DNA, some basic proteins called histone adn RNA only . How many of the above statement are correct

In a solar cell, current is generated due to bond breakage in which region?

Draw a labelled diagram of the sectional view of a mature pollen grain of angiosperms. Explain the function of generative cell and vegetative cell

A Zener diode is fabricated by heavily doping both p- and n-sides of the junctions. Explain, why ? Briefly explain the use of zener diode as a dc voltage regulator with the help of a circuit diagram.

(a) Draw the circuit diagram of a full wave rectifier using p-n junction diole. Explain its working and show the output, input waveforms. (b) Show the output waveforms (Y) for the following inputs A and B of (i) OR gate (ii) NAND gate :