Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Physics

Which of the following statements about bar magnet is correct?

When iron filings are sprinkled on a sheet of glass placed over a short bar magnet then, the iron filings form a pattern suggesting that the magnet has ______.

Which of the following statement about magnetic field lines is true?

In which case of comparing solenoid and bar magnet there is no exact similarity?

Magnetic field at far axial point due to solenoid as well as bar magnet varies ______.

According to the dipole analogy 1/ε₀ corresponds to ______.

Effective voltage V_rms is related to peak voltage V_o by ______.

In an a.c. circuit, with phase voltage V and current I, the power dissipated is ______.

If V_m and I_m are peak voltage and current, impedance Z in an AC circuit is ______.

According to Huygens principle, ______.

According to Huygen's construction, relation between old and new wavefront is ______.

Relation between ray and wavefront is ______.

In which case is electron emission from a metal not known?

Alpha particles used in Geiger-Marsden experiment were obtained from ______.

In Geiger-Marsden experiment prediction was that ______.

The basic force acting on the alpha particles using Coulomb's law is ______.

In Geiger-Marsden experiment, actual results were ______.

The model that best explains the results of Geiger-Marsden experiment is ______.

In the case of metals, the valence and conduction bands ______.

In the case of semiconductors, the valence and conduction bands ______.