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ISC Class 12 Physics Solved Question Paper 2006

Short Answer Type

1. Can 8.6 x 10^-19 coulomb of charge be given to a conductor ? Explain.

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2. What will be the nature of the electric potential at a place where the electric field E = 0 ?

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3. What is the work done in turning an electric dipole through 360° ?

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4. Why is a potentiometer preferred over a voltmeter in measuring the emf of a cell ?

A potentiometer does not draw any current from the cell whose e.m.f. is to be determined. Whereas voltmeter always draw some current. Therefore, the e.m.f measured by voltmeter is slightly less than actual value of the e.m.f. of cell.

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5. Two wires A and B of equal mass and of the same material are taken. The diameter of wire A is half the diameter of wire B. If the resistance of wire A is 24 Ω, calculate the resistance of wire B.

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6. In the circuit, the length of the wire AB = 400 cm. Where should the jockey, J be placed so that the galvanometer shows a zero deflection?

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7. The thermoelectric emf is given by,

E =

aθ space plus space 1 half βθ squared

;
where θ is the difference in temperature of the hot junction over the cold junction and α and β are constants.

Express the neutral temperature θ_n in terms of α and β.

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8. State the S.I. unit of the magnetic moment of a magnet, indicating its direction.

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9. An electron, moving with a velocity of 5 x 10⁷ ms^-1, enters a magnetic field of 1 wb m^-2 at an angle of 30°. Calculate the force on the electron.

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