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 : At low temperature, Lead behaves as a : (1) Semi conductor (2) Super conductor (3) Insulator (4) Conductor
Last Answer : Super conductor
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.
Last Answer : semi-conductor
Description : A pure semiconductor under ordinary conditions behaves like (A) a conductor. (B) an insulator. (C) a magnetic material. (D) a ferro-electric material.
Last Answer : (B) an insulator.
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 : Silicon is a _____. A. Superconductor B. Conductor C. Semi-conductor D. Insulator
Last Answer : ANSWER: C
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 : 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 : 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 : Due to self-inductance, the coil wires are known as: a. Insulator b. Conductor c. Inductor d. Semi-conductor
Last Answer : c. Inductor
Description : In a transistor, the base is _______. (1) an insulator (2) a conductor of low resistance (3) a conductor of high resistance (4) an extrinsic semiconductor
Last Answer : (2) a conductor of low resistance Explanation: A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
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.
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 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 : Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called. (1) Super conductors (2) Semi conductors (3) Dielectrics (4) Perfect conductors
Last Answer : (1) Super conductors Explanation: Superconductors are materials that carry electrical current with little or no resistance when cooled, below a certain temperature. While conventional superconductors need to ... temperature superconductors do so above the boiling point of liquid nitrogen (-196 °C).
Description : Certain substances loose their electrical resistance completely at super low temperature. Such substances are called. (1) Super conductors (2) Semi conductors (3) Dielectrics (4) Perfect conductors
Last Answer : Super conductors
Description : Why two thin shirts can keep us warmer than a single thick shirt in winter ? (1) Two thin shirts become thicker so prevent transmission of heat (2) Air layer between two shirts works as good conductor (3) Air layer between two shirts behaves like insulating media (4) No radiation of heat takes place
Last Answer : Air layer between two shirts behaves like insulating media
Description : If electrical conductivity increases with the increase of temperature of a substance, then it is a: (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator
Last Answer : (2) Semiconductor Explanation: A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects
Description : If electrical conductivity increases with the increase of temperature of a substance, then it is a (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator
Last Answer : (2) Semiconductor Explanation: A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects.
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 : Ohm's law is valid in case of – (1) semiconductor (2) conductor (3) superconductor (4) insulator
Last Answer : (2) conductor Explanation: Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. It defines the relationship between the three fundamental, electrical quantities: current, voltage, and resistance.
Description : Electricians use rubber gloves while working because - (1) rubber is an insulator (2) rubber is a good conductor (3) wearing rubber gloves is mandatory (4) rubber makes work easy
Last Answer : (1) rubber is an insulator
Description : Mud houses are cooler in summers and wanner in winters as compared to brick houses because (1) mud is a good conductor (2) mud is a bad conductor (3) mud is a poor insulator (4) evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Last Answer : (2) mud is a bad conductor Explanation: The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is ... . In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
Description : Ohm’s law is valid in case of (1) semiconductor (2) conductor (3) superconductor (4) insulator
Last Answer : conductor
Description : Mud houses are cooler in summers and warmer in winters as compared to brick houses because (1) mud is a good conductor (2) mud is a bad conductor (3) mud is a poor insulator (4) evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Last Answer : mud is a bad conductor
Description : A semiconductor is a material with a _____________. A. conductivity higher than a normal conductor B. conductivity higher than a normal insulator C. high conductivity at low temperatures D. low conductivity at high temperatures
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).
Description : The third law of thermodynamics states that the (A) Heat capacity of a crystalline solid is zero at absolute zero temperature (B) Heat transfer from low temperature to high temperature source is ... without external work (C) Gases having same reduced properties behaves similarly (D) None of these
Last Answer : (A) Heat capacity of a crystalline solid is zero at absolute zero temperature
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 : 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 : 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 : 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 : 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 : Why are Metals good conductor of heat than insulator? -General Knowledge
Last Answer : The answer is 'They contain free electrons'
Last Answer : answer:
Description : Penny conductor or insulator?
Last Answer : Copper is a conductor, so and pennies are coated in copper.
Description : Is a coin a insulator or a conductor?
Last Answer : A very good conductor.
Description : Is Rubber insulator or conductor?
Last Answer : Rubber is an insulator.
Description : Is wood a conductor or a insulator?
Last Answer : Wood is a conductor, though not a very good one.
Description : Is styrofoam insulator or conductor?
Last Answer : Styrofoam is an insulator.
Description : Is copper insulator or conductor?
Last Answer : Conductor, which is why it's used for wires.
Description : Is plastic insulator or conductor?
Last Answer : Plastic is an insulator.
Last Answer : conductor Money Conductor , guide , electrically conductive , cm _ _ _ Contactor Money Pre Director , Insulator Money Non-conductive Objects.
Description : In your own words explain the difference between a conductor and an insulator?
Last Answer : Need answer
Description : Is a brass paper fastener an insulator or conductor?
Description : Is a paper clip an insulator or an conductor?
Last Answer : Most paperclips are metal- conductor.
Description : Is a piece of fabric a conductor or insulator?
Last Answer : conducter