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A narrow parallel beam of light is incident paraxially on a solid transparent sphere of radius r kept in air. What should be the refractive index if the beam is to be focused at the farther surface of the sphere.

The charge q on a capacitor varies with voltage as shown in figure. The area of the triangle AOB represents:

Two rods of same length and material transfer a given amount of heat in 12 seconds, when they are joined end to end. But when they are joined lengthwise, then whey will transfer same heat in same conditions in:

A block ‘A’ of mass M moving with speed u collides elastically with block B of mass m which is connected to block C of mass m with a spring. When the compression in spring is maximum the velocity of block C with respect to block A is (neglect friction):

A boat is moving in direction of vector `-4veci+30vecj` with a speed of 10 m/sec. velocity vector of boat can be expressed as:

Identify, the property which is not characteristic for a semiconductor?

Carbon, silicon, and germanium have four valence electrons each. At room temperature, which one of the following statements is most appropriate?

The relation between number of fee electrons (n) in a semiconductor and temperature (T) is given by

An electrically neutral semi conductor has

Carbon, Silicon, and Germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy baud gap respectively equal to `(E_g)_c ,(E_g)_(si)` and `(E_g)_(Ge)`. which of the following statement is true?

The valency of impurity element for making p-type semiconductor is

In n-type semiconductors the electron concentration is equal to

p-type semi conductor is

An n-type and p-type silicon can be obtained by doping pure silicon with

With increase in temperature in au intrinsic semiconductor the ratio of conduction electrons and holes is

When the conductivity of a semi conductor is only due to breaking of covalent bonds, the semi conductor is called

In Fig assuming the diodes to be ideal:

When a p-n junction diode is forward-biased, energy is released at the junction due to the recombination of electrons and holes. This energy is in

When a transistor amplifier having current gain of 75 is given an input signal, `V_1 =2sin(157 +pi/2)`, the output signal is found to be `V_o =200sin(157t+(3pi)/ 2)`. The transistor is connected as:

In which of the transistor configurations, the voltage gain is highest?

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