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ISC Class 12 Physics Solved Question Paper 2007

Short Answer Type

1. State Gauss’s theorem.

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2. What will be the net electric force acting on an electric dipole placed in a uniform electric field ?

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3. Calculate the electric current density in a uniform wire connected to a battery of emf 3.5 V and negligible internal resistance. The resistance of the wire is 2.0 Ω and its area of cross section is 0.70 x 10^-6 m.

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4. Name the two conservation laws implied in Kirchoffs laws for electric circuits.

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5. Write in vector form, the defining equation for a magnetic field B at a point.

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6. Calculate the magnetic field (in SI unit) at the centre of a tangent galvanometer coil of 50 turns and radius 10 cm when a current of 1.0 A passes through it.

Magnetic field at the centre of the tangent galvanometer is given by,

straight B space equals space fraction numerator μN space straight I over denominator 2 straight a end fraction Here comma space straight N space equals space 50 space straight a space equals space 10 space cm space equals space 0.1 space straight m straight I space equals space 1.0 space straight A straight B space equals space straight mu subscript straight o space straight x space fraction numerator NI over denominator 2 straight a end fraction straight B space equals space fraction numerator 4 straight pi space straight x space 10 to the power of negative 7 end exponent space straight x space 50 space straight x space 1 over denominator 2 space straight x space 0.1 end fraction straight B space equals space fraction numerator 4 space straight x space 3.14 space straight x space 10 to the power of negative 7 end exponent space straight x space 50 space straight x space 10 over denominator 2 end fraction straight B space equals space 3.14 space straight x space 10 to the power of negative 4 end exponent space straight T

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7. The SI unit of coefficient of inductance is henry. Using any defining equation for L or M show that 1 henery = 1 ohm second.

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8. In a graphical variation of emf induced with time for the output of an AC generator, mark the peak value of emf induced and the time period.

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9. Mention any two uses of geostationary satellites.

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10.

The refractive indices of water, diamond and glass are 1.33, 2.0 and 1.5 respectively. In which of these will the speed of light be the maximum ? Justify your answer with a suitable reason.

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