Current Electricity — Physics STD 12 Science — Question

White light is passed through a prism whose angle is 5°. If the refractive indices for rays of red and blue colour are respectively 1.64 and 1.66, the angle of deviation between the two colours will be(a) 0.1 degree(b) 0.2 degree(c) 0.3 degree(d) 0.4 degree

In a streamline flow:

1. The speed of a particle always remains same.
2. The velocity of a particle always remains same.
3. The kinetic energies of all the particles arriving at a given point are the same.
4. The momenta of all the particles arriving at a given point are the same.

The unit of focal power of a lens is (a) Watt (b) Horse power(c) Dioptre(d) Lux

Assertio : Hydrogen atom consists of only one electron but its emission spectrum has many lines.  
Reason  : Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

If velocity of electron becomes equal to the velocity of light, then mass of electron will be:

Susceptibility is positive for:

A logic gate is an electronic circuit which(a) Makes logic decisions(b) Allows electrons flow only in one direction(c) Works binary algebra(d) Alternates between 0 and 1 values

Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential.

1. Continuously increases.
2. Continuously decreases.
3. Increases then decreases.
4. Decreases then increases.