Super conductors are substances that – (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current

Super conductors are substances that – (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current
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(1) offer minimum resistance to flow of electric current Explanation: A superconductor is a material that can conduct electricity or transport electrons from one atom to another with no resisttance. No heat, sound or any other form of energy is released from the material when it reaches the temperature at which it becomes superconductive.
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Super conductors are substances that (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current

Description : Super conductors are substances that (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current

Last Answer : offer minimum resistance to flow of electric current

Super conductors are those substances, which (A) Offer no resistance to current flow (B) Conduct electricity at low temperature (C) Offer high resistance to current flow (D) Conduct electricity at high temperature

Description : Super conductors are those substances, which (A) Offer no resistance to current flow (B) Conduct electricity at low temperature (C) Offer high resistance to current flow (D) Conduct electricity at high temperature

Last Answer : (A) Offer no resistance to current flow

Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures

Description : Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures

Last Answer : (2) Whose resistance falls almost to zero at very low temperature Explanation: Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in ... lines from the interior of the superconductor as it transitions into the superconducting state.

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

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).

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

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

Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Description : Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Last Answer : Whose resistance falls almost to zero at very low temperatures

The substances which have a large number of free electrons and offer a low resistance are called (a) insulators (b) inductors (c) semi-conductors (d) conductors

Description : The substances which have a large number of free electrons and offer a low resistance are called (a) insulators (b) inductors (c) semi-conductors (d) conductors

Last Answer : (d) conductors

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

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.

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

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 : semi-conductor

How do electrolytic conductors conduct electricity ?

Description : How do electrolytic conductors conduct electricity ?

Last Answer : Compounds that conduct electricity in solution or in molten state are called electrolytic conductors. These compounds can conduct electricity in molten state and in aqueous solution as they are ... the positive and negative ions receive and reject electrons, respectively, so that electricity flows.

Substances of conductivity between 10–10  10–20 (n m )–1 are: a) Insulators b) Semiconductors c)Super conductors d)Good conductors

Description : Substances of conductivity between 10–10  10–20 (n m )–1 are: a) Insulators b) Semiconductors c)Super conductors d)Good conductors

Last Answer : a) Insulators

The substances of conductivity of the order of 10–6 – 10–4 (m)–1 are : a) Insulators b) Super conductors c) Semiconductors d)Good conductors

Description : he substances of conductivity of the order of 10–6 – 10–4 (m)–1 are : a) Insulators b) Super conductors c) Semiconductors d)Good conductors

Last Answer : d)Good conductors

Metals are good conductors of electricity because - (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above

Description : Metals are good conductors of electricity because - (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above

Last Answer : (1) they contain free electrons Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.

Metals are good conductors of electricity because – (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above

Description : Metals are good conductors of electricity because – (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above

Last Answer : (1) they contain free electrons Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.

The substances which conduct electric- ity with the help of the ions present in them are called?

Description : The substances which conduct electric- ity with the help of the ions present in them are called?

Last Answer : Electrolytes

In a DC series circuit, all the conductors have the same ____________. A. power expended in them B. voltage drop across them C. resistance to current flow D. current passing through them

Description : In a DC series circuit, all the conductors have the same ____________. A. power expended in them B. voltage drop across them C. resistance to current flow D. current passing through them

Last Answer : Answer: D

A bird sitting on a high tension electric wire does not get electrocuted because – (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators

Description : A bird sitting on a high tension electric wire does not get electrocuted because – (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators

Last Answer : (3) it does not form a closed path for the flow of current Explanation: Electricity travels from a place of high voltage to low voltage, just as water travels from high elevation to low ... When electricity travels through a body in this fashion, electrocution takes place, and the bird can die.

A bird sitting on a high tension electric wire does not get electrocuted because (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators

Description : A bird sitting on a high tension electric wire does not get electrocuted because (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators 

Last Answer : it does not form a closed path for the flow of current

The substances which have a large number of free electrons and offer a low resistance are called?

Description : The substances which have a large number of free electrons and offer a low resistance are called?

Last Answer : The substances which have a large number of free electrons and offer a low resistance are called conductors.

Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to a very high temperature (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Description : Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to ... D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Last Answer : (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

What is the difference between the Earth’s electric field and the electric field used to conduct electricity in my home?

Description : What is the difference between the Earth’s electric field and the electric field used to conduct electricity in my home?

Last Answer : The Earth's electric field is A. The Earth's electric field is mainly a continuous mainly a continuous direct current (DC) producing fi direct current (DC) producing field. Throughout eld. Throughout history, ... on the job) and higher rates of Back to Top job) and higher rates of health problems.

Which of the following is false? (1) Most carbon compounds are poor conductors of electricity. (2) The force of attraction between carbon molecules is not very strong. (3) The atomic number of carbon is 6. (4) The earth’s crust has about 2% carbon in the form of minerals.

Description : Which of the following is false? (1) Most carbon compounds are poor conductors of electricity. (2) The force of attraction between carbon molecules is not very strong. (3) The atomic number of carbon is 6. (4) The earth’s crust has about 2% carbon in the form of minerals.

Last Answer : (4) The earth’s crust has about 2% carbon in the form of minerals.

Why are covalent compounds poor conductors of electricity? (1) Due to the presence of charged particles. (2) Due to the absence of charged particles. (3) Due to the presence of a triple bond. (4) None of the above

Description : Why are covalent compounds poor conductors of electricity? (1) Due to the presence of charged particles. (2) Due to the absence of charged particles. (3) Due to the presence of a triple bond. (4) None of the above

Last Answer : (2) Due to the absence of charged particles. Explanation: In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.

Which of the following are bad conductors of electricity? (1) Mica and Quartz (2) Metals and Rubber (3) Metals and Mica (4) Mica and Rubber

Description : Which of the following are bad conductors of electricity? (1) Mica and Quartz (2) Metals and Rubber (3) Metals and Mica (4) Mica and Rubber

Last Answer : (1) Mica and Quartz Explanation: Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.

When insulation failure produces a low resistance current path between two conductors, the resulting condition is known as ____________. A. an open B. a short circuit C. a ground D. a surge

Description : When insulation failure produces a low resistance current path between two conductors, the resulting condition is known as ____________. A. an open B. a short circuit C. a ground D. a surge

Last Answer : Answer: B

Which of the following is not a characteristic of organic compounds? (a) They usually have low melting points. (b) They usually are only slightly soluble or insoluble in water. (c) If water soluble they seldom conduct an electric current. (d) Bonds which bind the atoms together are nearly always ionic.

Description : Which of the following is not a characteristic of organic compounds? (a) They usually have low melting points. (b) They usually are only slightly soluble or insoluble in water. (c) If water ... they seldom conduct an electric current. (d) Bonds which bind the atoms together are nearly always ionic.

Last Answer : Bonds which bind the atoms together are nearly always ionic.

The temperature of boiling water in a steam engine may be high because - (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the lire is at very high temperature

Description : The temperature of boiling water in a steam engine may be high because - (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the lire is at very high temperature

Last Answer : (3) there is high pressure inside the boiler Explanation: In the boiler of a steam engine, there is a firebox where coal is shoveled into. The coal is kept burning at a very high temperature, and ... reservoir; the steam is then controlled by a slide valve to move into a cylinder to push the piston.

The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature

Description : The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature

Last Answer :  there is high pressure inside the boiler

Heat flux, as defined in heat flow is analogous to __________ in electricity flow. (A) Current (B) Voltage (C) Resistance (D) None of these

Description : Heat flux, as defined in heat flow is analogous to __________ in electricity flow. (A) Current (B) Voltage (C) Resistance (D) None of these

Last Answer : (A) Current

For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Description : For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Last Answer : (3) Nichrome Explanation: Nichrome has high resistance and it is called a resistor.

For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Description : For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Last Answer : Nichrome

Metals are good conductors of electricity because (a) The contain free electrons (b) The atoms are lightly packed (c) They have high melting point (d) All of the above

Description : Metals are good conductors of electricity because (a) The contain free electrons (b) The atoms are lightly packed (c) They have high melting point (d) All of the above

Last Answer : Ans:(b)

Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.

Description : Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.

Last Answer : (C) Bad conductors of electricity.

Substances whose specific resistance abruptly decreases at very low temperature are called

Last Answer : Substances whose specific resistance abruptly decreases at very low temperature are called superconductors.

Photoelectric electricity is produced directly from solar energy when which of the following are absorbed in a semiconductor to create an electric current? w) protons x) electrons y) neutrons z) photons

Description : Photoelectric electricity is produced directly from solar energy when which of the following are absorbed in a semiconductor to create an electric current? w) protons x) electrons y) neutrons z) photons

Last Answer : ANSWER: Z -- PHOTONS

Diamond has each of the following properties except: w) extreme hardness x) ability to conduct electricity y) high melting point z) tendency to burn in air

Description : Diamond has each of the following properties except: w) extreme hardness x) ability to conduct electricity y) high melting point z) tendency to burn in air

Last Answer : ANSWER: X -- ABILITY TO CONDUCT ELECTRICITY 

Which one of the following laws best describes the operation of an electric generator? w) Ampere's Law x) Gauss' Law y) Ohm's Law for Conductors z) Faraday's Law of Induction

Description : Which one of the following laws best describes the operation of an electric generator? w) Ampere's Law x) Gauss' Law y) Ohm's Law for Conductors z) Faraday's Law of Induction

Last Answer : ANSWER: Z -- FARADAY'S LAW OF INDUCTION 

What substances are used as conductors ?

Description : What substances are used as conductors ?

Last Answer : Answer : Copper , Aluminum , Peel Leah , Phosphor Prange , Silver , Cheap Tungsten , Nickel etc.

Which of the following principle is used to produce low-temperatures'? (1) Super conductivity (2) Joule-Kelvin effect (3) Thermo-electric effect (4) Adiabatic demagnetization

Description : Which of the following principle is used to produce low-temperatures'? (1) Super conductivity (2) Joule-Kelvin effect (3) Thermo-electric effect (4) Adiabatic demagnetization

Last Answer : (4) Adiabatic demagnetization Explanation: Magnetic refrigeration is a cooling technology based on the magnetocaloiic effect. This technique can be used to attain extremely low temperatures, as well as the ... of a suitable material is caused by exposing the material to a changing magnetic field.

Which of the following principle is used to produce ‘low-temperatures’ ? (1) Super conductivity (2) Joule-Kelvin effect (3) Thermo-electric effect (4) Adiabatic demagneti-sation

Description : Which of the following principle is used to produce ‘low-temperatures’ ? (1) Super conductivity (2) Joule-Kelvin effect (3) Thermo-electric effect (4) Adiabatic demagneti-sation

Last Answer : Adiabatic demagneti-sation

Line losses in a distribution circuit are kept to a minimum by __________. A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage C. increasing the number of thermal relays in the circuit D. using higher voltage and lower current

Description : Line losses in a distribution circuit are kept to a minimum by __________. A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage C. increasing the number of thermal relays in the circuit D. using higher voltage and lower current

Last Answer : Answer: D

Substances; that do not conduct elec- tricity are called?

Description : Substances; that do not conduct elec- tricity are called?

Last Answer : Insulators

The insulation of electric generators during short idle periods should be _____________. A. allowed to cool slowly to ambient temperatures B. flashed with direct current to remove any residual magnetism C. kept warm by using strip or space heaters D. relieved of all capacitive charge by grounding the conductors

Description : The insulation of electric generators during short idle periods should be _____________. A. allowed to cool slowly to ambient temperatures B. flashed with direct current to remove any residual ... using strip or space heaters D. relieved of all capacitive charge by grounding the conductors

Last Answer : Answer: C

In electronic conductors, what is the reason for flow of current ?

Description : In electronic conductors, what is the reason for flow of current ?

Last Answer : Reason for flow of current is that moment of free electrons from higher negative potential to a lower positive potential region.

Nichrome wire is used in an electric heater because _______. (1) It has high resistance (2) It has high melting point (3) It can resist a current upto approx 5 amperes (4) For all of the above reasons

Description : Nichrome wire is used in an electric heater because _______. (1) It has high resistance (2) It has high melting point (3) It can resist a current upto approx 5 amperes (4) For all of the above reasons

Last Answer : (4) For all of the above reasons

The fuse in our domestic electric circuit melts when there is a high rise in – (1) Inductance (2) Current (3) Resistance (4) Capacitance

Description : The fuse in our domestic electric circuit melts when there is a high rise in – (1) Inductance (2) Current (3) Resistance (4) Capacitance

Last Answer : (2) Current Explanation: In electronics and electrical engineering, a fuse is a type of low resistance resistor that acts as a sacrificial device to provide over protection, of either the load ... fuse interrupts excessive current (blows) so that further damage by overheating or fire is prevented.

Which property of metals make them good conductors of electricity?

Description : Which property of metals make them good conductors of electricity?

Last Answer : Their mobile electrons

Generally Non-metals are not conductors of electricity. Which of the given is a good conductor of electricity? a) Diamond b) Graphite c) Sulphur d) Fullerene

Description : Generally Non-metals are not conductors of electricity. Which of the given is a good conductor of electricity? a) Diamond b) Graphite c) Sulphur d) Fullerene

Last Answer : b) Graphite

Metals are good conductors of electricity because they have: (a) Large number of bounded electrons (b) Small number of electrons (c) Large number of free electrons (d) Small number of free electrons

Description : Metals are good conductors of electricity because they have: (a) Large number of bounded electrons (b) Small number of electrons (c) Large number of free electrons (d) Small number of free electrons

Last Answer : (c) Large number of free electrons

Which of the following statement is correct: (a) Similar charges attract each other (b) Similar charges attract and repel each other (c) Similar charges repel each other (d) Similar charges neither attract nor repel 9. Metals are good conductors of electricity because they have:

Description : Which of the following statement is correct: (a) Similar charges attract each other (b) Similar charges attract and repel each other (c) Similar charges repel each other (d) Similar charges neither attract nor repel 9. Metals are good conductors of electricity because they have:

Last Answer : (c) Similar charges repel each other