According to Cauchy, the Refractive index isA. Directly proportional to the wavelength of lightB. Directly proportional to the square of the wavelength of lightC. Inversely proportional to the wavelength of light D. Inversely proportional to the square of the wavelength of light

What is short circuit?

Which one of the following is non-ohmic resistance?

• A) Mercury
• B) Copper
• C) Nichrome
• D) Bulb of a torch

What is the unit of electric field intensity?

• A. Newton per metre
• B. Coulomb per newton
• C. Newton per coulomb
• D. Joule per newton

The principle of LASER action involves,

• a) Amplification of a particular frequency emitted by the system
• b) Population inversion
• c) Stimulated emission
• d) All of the above

Hysteresis loss and eddy current are used in

• A) Induction heating of steel
• B) Dielectric heating
• C) Induction heating of brass
• D) None of the above