CBSE Class 12 (Science) Semiconductors — practice questions
46 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Semiconductors in the app →A p-n junction diode is forward biased when:The output of an AND gate is HIGH only when:At absolute zero ($T = 0\,\text{K}$), a pure intrinsic semiconductor behaves like a(n)The barrier (built-in) potential of an unbiased silicon p-n junction at room temperature is approximatelyThe band holding the valence electrons is called the:The band just above the valence band is the:The energy separation between the two bands is called the:Deliberate addition of an impurity to a semiconductor is called:A doped semiconductor is described as:In an intrinsic semiconductor, electrons and holes are:Doping with a pentavalent atom gives which type?Doping with a trivalent atom gives which type?A pentavalent impurity is known as a:A trivalent impurity is known as an:In an n-type semiconductor, the majority carriers are:In a p-type semiconductor, the majority carriers are:One acceptor atom gives how many holes?Conductivity of an intrinsic semiconductor depends on its:A material with a band gap above three electron volts is an:A material with a band gap below three electron volts is a:A material behaves as a metal when the two bands:In an n-type semiconductor, the minority carriers are:A junction diode is described as a device with how many electrodes?Holes exist as vacant levels created in the:The two elemental semiconductors studied here are germanium and:In an isolated atom, an electron's energy is fixed by its:Inside a crystal, no two electrons see the same pattern of:Closely spaced energy levels in a solid form what are called:Which band contains the energy levels of valence electrons:The band lying above the valence band is called the:With no external energy supplied, the valence electrons all sit in the:In the absence of excitation, the conduction band is normally:When the conduction band overlaps the valence band, the material is a:If a gap leaves the valence electrons all bound, the material is an:At room temperature, the conductivity of an intrinsic semiconductor is:The conductivity of a semiconductor is improved by adding:The impurity added to a semiconductor is measured in parts per:A semiconductor with added impurity is called:The deliberate addition of an impurity is called:Atoms of the added impurity go by which name:A dopant must be chosen so that it does not distort the:For a dopant not to distort the lattice, its atoms must be of nearly the same:Silicon and germanium are described as elements that are:How many types of dopant are used with silicon or germanium?Arsenic, antimony and phosphorus are dopants that are:Indium, boron and aluminium are dopants that are: