Current Electricity — Physics STD 12 Science — Question

To obtain a P-type germanium semiconductor, it must be doped with(a) Arsenic(b) Antimony(c) Indium(d) Phosphorus

Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is(a) Einstein mass - energy relation(b) Einstein theory of relativity(c) Photoelectric effect(d) None of these

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow more brightly(a) 25 watt bulb(b) 100 watt bulb(c) First 25 watt and then 100 watt(d) Both with same brightness

A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.

If a diamagnetic substance is brought near north or south pole of a bar magnet, it is:

Tangent galvanometer is used to measure(a) Steady currents(b) Current impulses(c) Magnetic moments of bar magnets(d) Earth's magnetic field

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866u. The energy liberated per u is (Given 1 u = 931MeV)

The magnetic susceptibility is