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Subject

Physics

Class

ICSE Class 12

Pre Boards

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Sample Papers

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ISC Class 12 Physics Solved Question Paper 2010

Multiple Choice Questions

1. Electric field intensity ‘E’ at a point P (Figure 1) at a perpendicular distance ‘r’ from an infinitely long line charge X’X having linear charge density X is given by:

$straight E space equals space open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses space fraction numerator 2 straight lambda over denominator straight r squared end fraction$
$straight E space equals space open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses space fraction numerator 2 straight lambda over denominator straight r end fraction$
$straight E space equals space open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses space straight lambda over straight r squared$
$straight E space equals space open parentheses fraction numerator 1 over denominator 4 πε subscript straight o end fraction close parentheses space straight lambda over straight r squared$

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2. A moving coil galvanometer can be converted into a voltmeter by connecting:

A low resistance in series with its coil.
A low resistance in parallel with its coil.
A high resistance in parallel with its coil.
A high resistance in parallel with its coil.

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3. The loss of power in a transformer can be reduced by:

Increasing the number of turns in primary
Increasing ac voltage applied to primary.
Using a solid core made of steel.
Using a solid core made of steel.

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4. Which equation represents the emission of a beta particle by a radioactive nucleus:

$straight n presubscript 0 presuperscript 1 space rightwards arrow space straight H presubscript 1 presuperscript 1 space plus space straight e presubscript negative 1 end presubscript presuperscript 0 space plus space straight nu$
$straight gamma space rightwards arrow space straight e presubscript 1 presuperscript 0 space plus space straight e presubscript negative 1 end presubscript presuperscript 0$
$4 space straight H presubscript 1 presuperscript 1 space rightwards arrow space He presubscript 2 presuperscript 4 space plus space 2 space straight e presubscript 1 presuperscript 0$
$4 space straight H presubscript 1 presuperscript 1 space rightwards arrow space He presubscript 2 presuperscript 4 space plus space 2 space straight e presubscript 1 presuperscript 0$

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5. An important component of Michelson’s method to determine speed of light is:

A NICOL prism
A bi prism
A grating
A grating

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Short Answer Type

6. In an electric dipole, what is the locus of a point of zero potential?

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What is the resistance of a carbon resistor whose coloured bands are shown below in figure below:

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8. A part of an electric circuit is shown below figure below:

Using Kirchhoffs 2^nd Law, find the current I flowing through the 4 Ω resistor.

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9. Figure below shows a graph of emf‘e’ generated by an ac generator versus time ‘t’:

What is the frequency of the emf?

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10. Arrange the three types of magnetic materials, i.e., paramagnetic, diamagnetic and ferromagnetic materials, in decreasing order of their magnetic susceptibility.

The paramagnetic, diamagnetic and ferromagnetic materials can be arranged in decreasing order of magnetic susceptibility is as follows:

Ferromagnetic > Paramagnetic > Diamagnetic

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