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.

For the mesh ACBA:

–12+4I+6=0

$rightwards double arrow$ 4I=6

$rightwards double arrow$ I = 3/2

$rightwards double arrow$ I =1.5A

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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.

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