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.
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 : The principle applied in liquefaction of gases is (A) Adiabatic expansion (B) Joule-Thomson effect (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : The temperature at which material show super conductivity is a) Super temperature b) Critical temperature c)Kelvin temperature d)Absolute
Last Answer : d)Absolute
Description : Who coined the word energy? a. James Joule b. Thomas Young c. Rudolf Diesel d. Kelvin
Last Answer : Thomas Young
Description : What is defined as the ratio of the change in temperature to the change in pressure when a real gas is throttled? A. Rankine coefficient B. Kelvin coefficient C. Maxwell-Boltzmann coefficient D. Joule-Thomson coefficient
Last Answer : Joule-Thomson coefficient
Description : Entropy is measured in ______. A. Joule/Kelvin B. Joule-Meter/Kelvin C. Meter/Kelvin D. Newton/Kelvin
Last Answer : Joule/Kelvin
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
Last Answer : Answer: B
Description : 6. Liquefaction of gases cannot be done by (A) Exchange of heat with colder stream (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion) (C) Merely compressing it beyond critical pressure (D) Adiabatic expansion against a piston or in a turbine
Last Answer : (C) Merely compressing it beyond critical pressure
Description : Claude process of gas liquefaction employs (A) Merely compression of gas beyond its critical pressure (B) Joule-Thomson expansion cooling (C) Heat exchange with colder stream (D) Adiabatic expansion against a piston or in a turbine
Last Answer : (D) Adiabatic expansion against a piston or in a turbine
Description : Linde process of gas liquefaction employs (A) Exchange of heat with colder stream (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion) (C) Adiabatic expansion against a piston or in a turbine (D) Merely compressing the gas beyond its critical pressure
Last Answer : (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Description : Joule-Thomson experiment is (A) Isobaric (B) Adiabatic (C) Isenthalpic (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C)
Description : Joule-Thomson co-efficient is the ratio of (A) Pressure change to temperature change occuring during adiabatic compression of a gas (B) Pressure change to temperature change occuring during adiabatic ... a gas (D) Temperature change to pressure change occuring during adiabatic throttling of a gas
Last Answer : (D) Temperature change to pressure change occuring during adiabatic throttling of a gas
Description : Convert the following temperatures from degree celcius to kelvin.
Last Answer : Convert the following temperatures from degree celcius to kelvin. a. -15°C b. 25°C c. -197°C d. 273°C
Description : Which one is true for a throttling process? (A) A gas may have more than one inversion temperatures (B) The inversion temperature is different for different gases (C) The inversion ... gases (D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Last Answer : (B) The inversion temperature is different for different gases
Description : Hydraulic machines work under the principle of – (1) Newton’s law (2) Joule law (3) Pascal’s law (4) Floatation law
Last Answer : (3) Pascal’s law Explanation: Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
Description : The S.I. unit of electric charge is – (1) ampere (2) coulomb (3) e.s.u (4) Kelvin
Last Answer : (2) coulomb Explanation: The SI unit of quantity of electric charge is the coulomb, which is equivalent to about 6.242x10^18 e (e is the charge of a proton). Hence, the charge of ... of charge that has passed through the cross section of an electrical conductor canying one ampere within one second.
Description : The S.I. unit of electric charge is : (1) ampere (2) coulomb (3) e.s.u (4) kelvin
Last Answer : coulomb
Description : Pick out the wrong statement. (A) Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat (B) ... flame temperature (D) Adiabatic flame temperatures of actual combustions are always less than the maximum values
Last Answer : (C) Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature
Description : With increase in calorific value of fuels, their adiabatic flame temperatures (A) Increase (B) Decrease (C) Remain unchanged (D) May increase or decrease; depends on the quantity of products of combustion
Last Answer : (D) May increase or decrease; depends on the quantity of products of combustion
Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid ... pressure at temperature above 430° C. (4) It is a thermo chemical decomposition of organic waste
Last Answer : (2) The process occurs at a temperature above 430°C at atmospheric pressure. Explanation: Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the ... . Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
Description : When was the comprehensive reorganisation of Indian States completed in accordance with the recommendations of States Reorgani-sation Commission? (1) 1953 (2) 1956 (3) 1960 (4) 1966
Last Answer : (2) 1956 Explanation: The States Reorganisation Commission (SRC) was a body constituted by the Central Government of India in 1953 to recommend the reorganization of state boundaries along the ... the single most extensive change in. state boundaries since the independence of India in 1947.
Description : The standard audible capacity of a healthy human being as per World Health Organi-sation is in the range of - (1) 45-50 decibels (2) 200-250 decibels (3) 5-10 decibels (4) 2000-2500 decibels
Last Answer : (3) 5-10 decibels Explanation: Hearing range usually describes the range of frequencies that can be heard by an animal or human, though it can also refer to the range of levels. In humans the audible ... as low as 12 Hz under ideal laboratory conditions, to 20 kHz in most children and some adults.
Description : The standard audible capacity of a healthy human being as per World Health Organi-sation is in the range of (1) 45-50 decibels (2) 200-250 decibels (3) 5-10 decibels (4) 2000-2500 decibels
Last Answer : 5-10 decibels
Description : The data collection for national income estimation is conducted in India by— (1) The Finance Ministry of the Government of India (2) The RBI (3) The NSSO (National Sample Survey Organi-sation) (4) None of these
Last Answer : The NSSO (National Sample Survey Organi-sation)
Description : When does Super conductivity result?
Last Answer : – When matter is cooled to very low temperature
Description : Which of the following was the first theory of super conductivity? (1) Ginzburg Landau theory (2) London theory (3) Resonating valence bond theory (4) Quantum field theory
Last Answer : (2) London theory Explanation: The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly ... wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold.
Last Answer : London theory
Description : When a gas is expanded from high pressure region to low pressure region; temperature change occurs". This phenomenon is related to the (A) Gibbs-Duhem equation (B) Gibbs-Helmholtz equation (C) Third law of thermodynamics (D) Joule-Thomson effect
Last Answer : (D) Joule-Thomson effect
Description : Evaporation by thermo compression results in the (A) Saving of steam (B) Realisation of multiple effect economy in a single effect (C) Both (A) and (B) (D) None of these
Description : First super conductor was discovered by a) Kelvin b) Hertz c)Einstein d) Kamerlingh Ornes
Last Answer : d) Kamerlingh Ornes
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 : (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 ... is released from the material when it reaches the temperature at which it becomes superconductive.
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
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 : Cryogenic is a science deals with - (1) High Temperatures (2) Low Pressure (3) High Pressure (4) Low Temperature
Last Answer : (4) Low Temperature Explanation: Cryogenics is the branch of physics that deals with the production and effects of very low temperatures.
Description : 'Cryogenics' is a science dealing with – (1) high temperatures (2) low temperatures (3) friction and wear (4) growth of crystals
Last Answer : (2) low temperatures Explanation: Cryogenics is the study of how to get to low temperatures and of how materials behave when they get there. Besides the familiar temperature scales of Fahrenheit and ... modern processes being used to treat metals (as well as other materials) is cryogenic tempering.
Description : ‘Cryogenics’ is a science dealing with (1) high temperatures (2) low temperatures (3) friction and wear (4) growth of crystals
Last Answer : low temperatures
Description : The ambient air is stable when the ambient lapse rate is – (1) Neutrally stable (2) Hyper-adiabatic (3) Sub-adiabatic (4) Super-adiabatic
Last Answer : (3) Sub-adiabatic
Description : The ambient air is stable when the ambient lapse rate is (1) Neutrally stable (2) Hyper-adiabatic (3) Sub-adiabatic (4) Super-adiabatic
Last Answer : Sub-adiabatic
Description : An electric field is given as E = 6y 2 z i + 12xyz j + 6xy 2 k. An incremental path is given by dl = -3 i + 5 j – 2 k mm. The work done in moving a 2mC charge along the path if the location of the path is at p(0,2,5) is (in Joule) a) 0.64 b) 0.72 c) 0.78 d) 0.80
Last Answer : b) 0.72
Description : Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity
Last Answer : ANSWER: Y -- HIGH MELTING POINT
Description : What statement of the second law of thermodynamics states that it is impossible to build a device that operates in a cycle and produces no effect other than the transfer of heat from a lower- ... A. Kelvin-Planck statement B. Clausius statement C. Kelvin statement D. Rankine statement
Last Answer : Clausius statement
Description : According to Kelvin-Planck's statement of second law of thermodynamics, A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work B. it ... other than the transfer of heat from a cold body to a hot body D. none of the above
Last Answer : Answer: A
Description : The ability of tool steel to resist softening at high temperatures is termed as __________ hardness. (A) Red (B) Extended (C) Super (D) Extreme
Last Answer : (C) Super
Description : What is the body temperature of a healthy person in Kelvin ?
Last Answer : The body temperature of a healthy person is 309.88 Kelvin .
Description : What is the Kelvin Scale ?
Last Answer : The Kelvin scale is a temperature scale that does not depend on the physical properties of the substance .
Description : What is the ideal efficiency of a reversible heat engine cyclically operating between a source temperature of 600 degrees Kelvin and a sink temperature of 150 degrees Kelvin?
Last Answer : ANSWER: 75 PERCENT
Description : Zero degrees Kelvin is equal to what temperature on the Celsius scale?
Last Answer : ANSWER: - 273 DEGREES CELSIUS or -273.15 DEGREES CELSIUS
Description : What is the SI unit for pressure? w) Torr x) pounds per square inch y) Pascal z) Kelvin
Last Answer : ANSWER: Y -- PASCAL