In the depletion region of a diode :
(A) There are no mobile charges
(B) Equal number of holes and electrons exist, making the region neutral
(C) recombination of holes and electrons has taken place
(D) Immobile charged ions exist
(E) There are mobile charges
Choose the correct answer from the options given below :

The S.I. unit of electron mobility is :

As the frequency of an ac circuit increases, the current first increases till it becomes maximum at resonance and then decreases. Which one of the following combinations of circuit elements are likely to comprise the circuit ?

When a potential difference is applied across a copper wire, the drift velocity of the electrons is v. If the same potential difference is applied across another copper wire of the same length but twice the diameter, the drift velocity of electrons will be

Five different waves travelling in the same direction are represented by: Choose the correct answer from the options given below for interference to take place:

If the wavelength of an electromagnetic radiation is doubled, the energy of the photons would be

When a transistor is used as an Amplifier, the phase difference between the input and the output signal voltage is

Read the passage carefully and answer the questions
The osmotic pressure is one of the four colligative properties which depends on the number of particles of solute in the solution, irrespective of their nature. The osmotic pressure is equal to the product of concentration, gas constant and temperature. It is the most commonly used property for the determination of the molar mass of biomolecules. In many situations, the molecules get dissociated or
associated when they are dissolved in a solvent, thereby changing the number of molecules in the solution. As a result, an abnormal molecular mass is obtained. The extent of dissociation or association is given by van't Hoff factor (i), which is the ratio of normal molar mass to abnormal molar mass. It is related with the degree of association or ionization. The introduction of van't Hoff factor in the osmotic pressure equation modifies the equation.
What is the value of the van't Hoff factor for\(NaCl , K _2 SO _4\) and KCl,respectively?

The corner points of the feasible region of a LPP with the constraints \(x+2 y \leq 40,3 x+y \geq 30,4 x+3 y \geq 60, x, y \geq 0\) are

Let \(f: R \rightarrow R\) be defined as \(f(x)=100 x+1\) where \(R\) is a set of real numbers, then

For what value of \(k\), the following system of equations has infinitely many solutions?
\(x+2 y=5\), \(3 x+k y=15\)

The Medical Termination of Pregnancy (Amendment) Act, 2017 was enacted by the government of India with the intension of __________.

A conducting sphere of radius R is given a charge Q. What is the electric field and the electric potential at the centre of the sphere?