Physics

ICSE Class 12

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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:

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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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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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The locus of the point of zero potential of an electric dipole is straight line drawn at the middle of the electric dipole.

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7.

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.

Using Kirchhoffs 2

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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?

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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