Materials, whose resistivity at very low temperatures plunges from a finite value to zero and remains there upon further cooling, are known as

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Materials, whose resistivity at very low temperatures plunges from a finite value to zero and remains there upon further cooling, are known as Superconductors

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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.

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

Description : Materials exhibiting zero value of resistivity are known as ______ . (a) conductors (b) semiconductors (c) insulators (d) superconductors

Last Answer : (d) superconductors

Description : A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part a. remains the same b. is doubled c. is halved d. becomes zero

Last Answer : a. remains the same

Description : Gold and silver are (A) dielectric materials (B) low resistivity conducting materials. (C) magnetic materials. (D) insulating materials.

Last Answer : (B) low resistivity conducting materials.

Last Answer : Low resistivity materials are used in transformer, motor and generator windings, transmission and distribution lines, house wiring.

Description : What is the correct sequence of the following materials in ascending order of their resistivity ?  1. Iron  2. Silver  3. Constantan  4. Mica  5. Aluminium  Select the correct answer using the codes given below :  (a) 2, 5, 1, 3 ... 5, 3, 1 and 2  (c) 2, 3, 1, 5 and 4  (d) 4, 5, 1, 3 and 2

Last Answer : What is the correct sequence of the following materials in ascending order of their resistivity ?  1. Iron  2. Silver  3. Constantan  4. Mica  5. Aluminium  Select the correct answer using the codes given below :  ... 1 and 2  (c) 2, 3, 1, 5 and 4  (d) 4, 5, 1, 3 and 2

Description : Which of the following statements is correct for any closed loop system ? (a) All the co-efficients can have zero value (6) All the co-efficients are always non-zero (c) Only one of the static error co-efficients has a finite non-zero value (d) None of the above

Last Answer : Ans: C

Description : The materials having very small susceptibility at all temperatures are a) Antiferromagnetic b) Diamagnetic c) Ferromagnetic d) Paramagnetic

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Description : Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the ... ) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Last Answer : (C) The intercept of the Arrhenius plot is called the 'activation energy

Description : Which of the following conditions indicates a short circuited capacitor when checking its condition with an ohmmeter? A. The capacitor shows charging, but the final resistance reading is appreciably less ... moves quickly to the low resistance side of the scale, then slowly recedes toward infinity.

Last Answer : Answer: B

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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

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Description : High resistivity materials are used in?

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Description : Which material has low resistivity?

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Description : In a free vortex motion, the radial component of velocity everywhere is (A) Maximum (B) Minimum (C) Zero (D) Nonzero and finite

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Description : In a forced vortex, the velocity of flow everywhere within the fluid is (A) Maximum (B) Minimum (C) Zero (D) Nonzero finite

Last Answer : Answer: Option D

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Last Answer : d. D. Both A and B

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Description : Zero permeability/permittivity implies which state? a) No ions are allowed in the medium b) No current is generated in the medium c) No magnetic or electric energy is permitted in the medium d) No resistivity

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Description : A material with zero resistivity is said to have a) Zero conductance b) Infinite conductance c) Zero resistance d) Infinite resistance

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Description : In free space, which of the following will be zero? a) Permittivity b) Permeability c) Conductivity d) Resistivity

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Description : At lower temperatures and pressures, the latent heat of vaporization of a refrigerant (a) decreases (b) increases (c) remains same (d) depends on other factors

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Description : Which law states that the specific heat of a gas remains constant at all temperatures and pressures  (a) Charles’ Law  (b) Joule’s Law  (c) Regnault’s Law  (d) Boyle’s Law  (e) there is no such law.

Last Answer : Answer : c

Description : What ice melt will be effective on my driveway at very low temperatures, while doing very little damge to my lawn.

Last Answer : Kitty litter works but it is expensive.

Description : The science dealing with the study of phenomena at very low temperatures is known as (a) refrigenics (b) cytogenics (c) frozenics (d) cryogenics

Last Answer : Ans:(d)

Description : The study of phenomena at very low temperatures is called - (1) heat transfer (2) morphology (3) crystallography (4) cryogenics

Last Answer : (4) cryogenics Explanation: A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist.

Description : Thermocouple is suitable for measuring (A) Liquid temperatures only (B) Very high temperatures only (C) Very low temperatures only (D) Both high and low temperatures

Last Answer : (D) Both high and low temperatures

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Last Answer : a) temperatures between 80^o-122^0

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Last Answer : Scientific study of very low temperatures

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Description : Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures ... strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

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Description : High-temperature superconductors have been in the news lately. These materials become superconductive at temperatures around w) 200 degrees Fahrenheit x) 100 degrees Fahrenheit y) -150 degrees Fahrenheit z) -350 degrees Fahrenheit

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Description : Intensive property of a system is one whose value  (a) depends on the mass of the system, like volume  (b) does not depend on the mass of the system, like temperature, pressure, etc.  (c) is not ... on the state  (d) is dependent on the path followed and not on the state  (e) remains constant.

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Description : The material used for a fuse wire should have (a) high resistivity (b) high ductility (c) high melting point (d) low melting point

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Description : Coke used for the production of calcium carbide should have (A) Low ash content (B) Low ignition temperature (C) High electrical resistivity (D) All (A), (B) and (C)

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Description : Dielectric (A) Is an electrical insulating material (B) Of low resistivity is preferred (C) Should have high thermal conductivity (D) Need not defy the corrosive action of chemicals

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Description : At temperatures above a limiting value, the energy of lattice vibrations, in a conductor, increases linearly with temperature so that resistivity increases linearly with temperature. In this region, this limiting value of temperature is called

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Description : Define resistivity. State its unit.

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Description : Problems on resistance and resistivity

Last Answer : Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY