Practice MCQ Questions and answers on Physics-GK

p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increases and resistivity remains the same.

When two semiconductor of p-type and n- type are brought in contact, they form p-n junction which act like a rectifier.

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

Integrated circuits are compact, and cheap and fast and more efficient than conventional circuits, and hence they are preferred over them.

Instability due to negative resistance of a tunnel diode is its drawback.

Keeping in view that; the distance between node and adjacent antinode is 30 cm. The wavelength is 60cm. A node is a point on a standing wave where the amplitude is minimum while antinode is the point of maximum displacement.

A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. The first transistors were made from germanium (Ge). Silicon (Si) types currently predominate but certain advanced microwave and high performance versions now employ the compound semiconductor material gallium arsenide (GaAs) and the semiconductor alloy silicon germanium (SiGe).

The most common function of a diode is to allow an electric current to pass in one direction (called the diode’s forward direction), while blocking current in the opposite direction (the reverse direction).This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers— these diodes are forms of rectifiers diode is a two terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.

IC stands for Integrated Circuit. It is a set of electronic circuits on one small plate (“chip”) of semiconductor material, normally silicon. Also known as chip or microchip, ICs are the heart and brains of most circuits and are are a keystone of modern electronics.

An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, consists of an inductor, represented by the letter L, and a capacitor, represented by the letter C. When connected together, they can act as an electrical resonator, an electrical analogue of a tuning fork, storing energy oscillating at the circuit’s resonant frequency. When connected together, they can act as an electrical resonator; an electrical analogue of a tuning fork, storing energy oscillating at the circuit’s resonant frequency. An LC circuit is an idealized model since it assumes there is no dissipation of energy due to resistance.