Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

The desirable properties for making permanent magnets are:

How will  the force between the two poles change if the two poles are connected by an iron rod keeping the distance between two magnetic poles constant ?

The frequency and intensity of a light source are both doubled. Consider the following statements.

• The saturation photocurrent remains almost the same.
• The maximum kinetic energy of the photoelectrons is doubled.

Vibration magnetometer works on the principle of(a) Torque acting on the bar magnet(b) Force acting on the bar magnet(c) Both the force and the torque acting on the bar magnet(d) None of these

The process of superimposing signal frequency (i.e. audio wave) on the carrier wave is known as (a) Transmission(b) Reception(c) Modulation(d) Detection

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on(a) ω and q(b) ω q and m(c) q and m(d)  ω and m

In Young's double slit experiment, if the widths of the slits are in the ratio 4 : 9, the ratio of the intensity at maxima to the intensity at minima will be(a) 169 : 25(b) 81 : 16(c) 25 : 1 (d) 9 : 4

In an LCR circuit the potential difference between the terminal of the inductance is 60V, between the terminals of the capacitor is 30V and that between the terminals of the resistance is 40V. The supply voltage will be equal to:

At the surface of a charged conductor electrostatic field must be _____ to the surface at every point.