Description : Pick out the wrong statement. (A) Lead can creep under its own weight at room temperature (B) The electrical conductivity of gold is considerably reduced by alloying additions due to ... metal (D) With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase
Last Answer : (C) Recrystallisation temperature decreases with decrease in strain in a cold worked metal
Description : State the impurities for obtaining p-type and n-type semiconductor from intrinsic semi conductor.
Last Answer : Crystals of Silicon and Germanium are doped using two types of dopants: 1. The impurities for obtaining n-type semiconductor from intrinsic semiconductor are pentavalent impurity; like Arsenic (As), Antimony ... semiconductor are trivalent impurity; like Indium (In), Boron (B), Aluminum (Al), etc.
Description : Is bromine a compound impure substance mixture or a pure substance?
Last Answer : Need answer
Description : Which one of the following is responsible for the working of New-ton's colour disc experiment? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour
Last Answer : (3) Persistence of vision Explanation: A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.
Description : A ______ is the one in which the player selects more than one strategy with fixed probabilities before playing the game. a. Mixed strategy b. Pure strategy c. Complete strategy d. Impure strategy
Last Answer : d. Impure strategy
Description : A _______ provides a complete definition of how a player will play a game a. Mixed strategy b. Pure strategy c. Complete strategy d. Impure strategy
Last Answer : c. Complete strategy
Description : Which one of the following is responsible for the working of Newton’s colour disc experiment ? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour
Last Answer : Persistence of vision
Description : In winter an iron pipe feel colder than a wooden window . This is because wood is----? A. Conductor B. Non-Conductor (Answer) C. Semi- Conductor D. Not a solid while iron is a solid E. None of these
Last Answer : B. Non-Conductor (Answer)
Description : What is an intrinsic semiconductor or pure semiconductor?
Last Answer : A semiconductor in which the number of holes and electrons are equal is called intrinsic orpure semiconductor.
Description : Silica (pure glass) fibers are used because of their low intrinsic material absorption at the wavelengths of operation. This wavelength of operation is between two intrinsic absorption regions. What are these two regions called? What are the wavelengths of operation for these two regions?
Last Answer : Ultraviolet absorption region (below 400 nm) and infrared absorption region (above 2000 nm).
Description : Pure semiconductors silicon and germanium are a) Extrinsic b) Intrinsic c) Insulator d) Diodes
Last Answer : b) Intrinsic
Description : A doped semiconductor is called : a) Extrinsic b) Intrinsic c) Insulator d) Conductor
Description : n-type semiconductor is an example of (A) extrinsic semiconductor. (B) intrinsic semiconductor. (C) super conductor. (D) insulators..
Last Answer : (A) extrinsic semiconductor.
Description : Due to self-inductance, the coil wires are known as: a. Insulator b. Conductor c. Inductor d. Semi-conductor
Last Answer : c. Inductor
Description : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as
Last Answer : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.
Description : Impure Zinc is known as?
Last Answer : Spelter
Description : We live in a single-storey semi-detached house without a lightning conductor (it was built 60 years ago). It is a colony of semi-detached houses, built on a hill, about 20 m apart (uphill). The ... lightning. We will not agree on a joint construction with a neighbor (we do not have good relations).
Last Answer : If the semi-detached house does not have a common electrical installation, then there is no risk. It also has no effect on individual objects.
Description : Which is a semi conductor memory? A) Dynamic B) Static C) Bubble D) Both a & b
Last Answer : Answer : D
Description : Silicon is a _____. A. Superconductor B. Conductor C. Semi-conductor D. Insulator
Last Answer : ANSWER: C
Description : At low temperature, Lead behaves as a (1) Semi conductor (2) Super conductor (3) Insulator (4) Conductor
Last Answer : (2) Super conductor Explanation: Lead exhibit superconducting phase transitions at low temperatures of 7.2 Kelvin. This discovery was made in 1913. At this temperature (known as critical temperature), ... to a different phase of matter; this superconducting phase is described by the BCS theory.
Description : Solids which conduct electricity at higher temperature but not at lower temperature are called (1) super-conductor (2) metallic-conductor (3) semi-conductor (4) insulator
Last Answer : (3) semi-conductor Explanation: Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
Description : Ohm’s law obeyed in - (1) a metallic conductor (2) a semi conductor (3) an electron tube (4) in all of the above
Last Answer : (1) a metallic conductor Explanation: There are, however, components of electrical circuits which do not obey Ohm's law; that is, their relationship between current and voltage (their I–V curve) is nonlinear (or non-ohmic).
Last Answer : (2) Super conductor Explanation: Lead exhibit super conducting phase transitions at low temperatures of 7.2 Kelvin. This discovery was made in 1913.
Description : While testing a semi-conductor diode with an ohmmeter, both the forward and reverse readings are almost in the infinity range. This would indicate that the unit is _____________. A. good B. open C. grounded D. shorted
Last Answer : Answer: B
Description : You are performing an out-of-circuit test of the semi-conductor shown in the illustration. Using an ohmmeter on 'low power' position and with leads properly installed, which of the listed results would you expect the ... lead on 'B' and black lead on 'A'; and a low reading with the leads reversed.
Description : You are performing an out-of-circuit test of the semi-conductor shown in the illustration. Using an ohmmeter on 'low power' position and with leads properly installed, which of the listed results would indicate a good ... lead on 'A' and red lead on 'C'; and a high reading with the leads reversed.
Last Answer : Answer: C
Description : You are performing an out-of-circuit test on the semi-conductor shown in the illustration. Using an ohmmeter on 'low power' setting and with leads properly inserted, which of the listed results would indicate a good ... lead on 'A' and red lead on 'C'; and a high reading with the leads reversed.
Last Answer : Answer: D
Description : Why does the conductivity of a semi conductor change with the rise in temperature ?
Last Answer : When a semi conductor is heated more & more electrons get enough energy to jump across the forbidden energy gap from valence band to the conduction band, where they are free to conduct electricity. Thereby increasing the conductivity of a semi conductor.
Description : What is the order of energy gap in a conductor, semi conductor, and insulator?.
Last Answer : Conductor - no energy gap Semi Conductor - It is of the order of 1 ev. Insulator - 6 ev (or) more than 6 ev.
Description : The electrical conductivity of a __________ decreases with rise in temperature. (A) Metal/alloy (B) Semi-conductor (C) Dielectric (D) None of these
Last Answer : (A) Metal/alloy
Description : Which of the following is form of semi conductor memory in which it is possible to change the contents of selected memory locations by applying suitable electrical signals? a. CAM b. ROM c. EPROM d. Abacus
Last Answer : EPROM
Description : is a semi conductor memory. 1) Dynamic 2) Static 3) Bubble 4) Both a & b
Last Answer : 4) Both a & b
Description : Nickel is a __________ material. (A) Ferromagnetic (B) Semi-conductor (C) Paramagnetic (D) Ferroelectric
Last Answer : (A) Ferromagnetic
Description : A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons. (A) Lack of free (B) Excess of (C) Decrease in (D) None of these
Last Answer : (B) Excess of
Description : With increase in temperature, the electrical conductivity of a __________ decreases. (A) Semi-conductor (B) Metal or alloy (C) Dielectric (D) None of these
Last Answer : (A) Semi-conductor
Description : Materials having resistivity ranging from 1 to 100 ohm. cm is termed as (A) Conductor (B) Insulator (C) Semi-conductor (D) None of these
Last Answer : (C) Semi-conductor
Description : Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron
Last Answer : Option D
Description : With increase in temperature, the electrical conductivity of semiconductors (A) Increases (B) Decreases (C) Remain constant (D) Either (A) or (B), depends on the type of semi-conductor
Last Answer : Option A
Description : . With increase in temperature, the electrical conductivity of semiconductors (A) Increases (B) Decreases (C) Remain constant (D) Either (A) or (B), depends on the type of semi-conductor
Description : The electrode for a battery must be A. A semi conductor B. An insulator C. A good conductor of electricity D. A bad conductor of electricity
Last Answer : C. A good conductor of electricity
Description : _________ is a semi conductor memory. 1 Dynamic 2 Static 3 Bubble 4 Both a & b
Last Answer : 4 Both a & b
Description : IBM 7000 digital computer a. Belongs to second generation b. Uses VLSI c. Employs semi conductor memory d. Has modular constructions
Last Answer : d. Has modular constructions
Last Answer : c. EPROM
Description : What is a semi conductor?
Last Answer : Substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities
Description : Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons
Last Answer : (b) majority carriers
Description : Conductivity of semi conductor is increased by: a) Decrease of temperature b) By keeping temperature constant c) Increase of temperature d) none of above
Last Answer : d) none of above
Description : A conductor, due to sag between two supports, takes the form of (a) semi-circle (b) triangle (c) ellipse (d) catenary
Last Answer : (d) catenary