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ISC Class 12 Physics Solved Question Paper 2009

Short Answer Type

41.

A sinusoidal voltage e = e₀ Sin (wt) is fed to a common emitter amplifier. Draw neatly labelled diagrams to show:

(i) Signal voltage

(ii) Output voltage of the amplifier.

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42. Make a truth table showing inputs at A and B and outputs at X, Y and Z for the combination of gates shown in figure below:

The truth table for the logic gate is as shown below:

1. When A and B are 0, we get X and Y as 1 and 1 respectively. When 1 and 1 is given as input we get output Z as 0.

2. When A is 0 and B is 1, we get X as 1 and Y as 0. We get Z as 1.

3. When A is 1 and B is 0, X is 0 and Y is 1 and Z is 1.

4. When A and B both are 1, then X and Y both will be zero and Z will be 1.

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Long Answer Type

43. With the help of a labelled diagram, obtain an expression for the electric field intensity ‘E’ at a point P in broad side position (i.e., equatorial plane) of an electric dipole.

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44. What is meant by ‘Chromatic aberration’? A thin convex lens of focal length 30 cm and made of flint glass (dispersive power = 0.03) is kept in contact with a thin concave lens of focal length 20 cm and made of crown glass. Calculate the dispersive power of crown glass if the above said combination acts as an achromatic doublet.

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