Subject

Physics

Class

ICSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

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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.


Common emitter n-p-n transistor Amplifier:

Signal voltage

 

Common emitter p-n-p transitor Amplifier:

Output voltage of the ampifier:


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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:


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 Multiple Choice QuestionsLong 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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45.

Electrons, initially at rest, are passed through a potential difference of 2 kV. Calculate their:  

(i) Final velocity and

(ii) de Broglie wavelength.

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