Physics Test - ...

The reactance of a capacitor of capacitance \(C\) is \(X\). If both the frequency and capacitance be doubled, then new reactance will be:

If collector current is 120 mA and base current is 2 mA and resistance gain is 3, what is power gain?

Determine the voltage (in V) of a battery connected to a parallel plate capacitor (filled with air) when the area of the plate is 10 square centimeters, the separation between the plates is 5 mm and the charge stored on the plates is 2 nC.

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

The angle of polarization of glass is 58° and that for water is 53° .The angle of polarization for glass in water is:

Value of forbidden energy gap for semi conductor is:

If the edge length of a cuboid are measured to be 1.2 cm, 1.5 cm and 1.8 cm, then the volume of the cuboid is:

The kinetic energy K of a particle moving along a circle of radius R depends on the distance covered is given as K = as². The force acting on the particle is:

The capacitance of a spherical capacitor which consists of two concentric spherical shells of radii a and b (a < b) as shown in Fig. is given by:

The transmission of high frequencies in a coaxial cable is determined by:

A long narrow solenoid is half filled with material of relative permeability \(\mu_1\) and half filled with another material of relative permeability \(\mu_2\). The number of turns per meter length of the solenoid is \(\mathrm n\). Calculate the magnetic field \((\mathrm B)\) on the axis of the solenoid at boundary of the two material (i.e. at point \(\mathrm P\) ). The current in solenoid coil is \(\mathrm I\).

In a pond of water, a flame is held \(2 \mathrm{~m}\) above the surface of water. A fish is at depth of \(4 \mathrm{~m}\) from water surface. Refractive index of water is \(\frac{4}{3}\). The apparent height of the flame from the eyes of fish is: