MODEL PAPER 6 — Physics STD 12 Science — Question

The resistance of a wire of uniform diameter d and length L is R. The  resistance of another wire of the same material but diameter 2d  and length 4L will be(a) 2R(b) R(c) R/2(d) R/4

In an insulator, the energy gap between conduction band and valence band is about:

Out of radioactive radiation which has highest penetrating power ?

In an electrical circuit, which of the following quantities is analogous to temperature?

When the current changes from +2A to -2A in 0.05 second, an e.m.f. of 8V is induced in a coil. The coefficient of self-induction of the coil is:

In conductor when electrons move between two collisions, their paths are ... A... when external fields are absent and ... B...when external filed is present. Here, A and B refer to:

The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth. The dipole axis makes an angle of 11.3° with the axis of the earth. At Mumbai, declination is nearly zero. Then,

Which of the following is conserved when light waves interfere(a) Intensity(b) Energy(c) Amplitude(d) Momentum

The product of resistivity and conductivity of a cylindrical conductor depends on: