The Stefan-Boltzmann constant depends on the (A) Medium (B) Temperature (C) Surface (D) None of these

The Stefan-Boltzmann constant depends on the
(A) Medium
(B) Temperature
(C) Surface
(D) None of these
by

1 Answer

Answer :

(D) None of these
by

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The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2 . The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10 -8 W/m2 .K4 )(A) 1000(B) 727(C) 800(D) 1200

Description : The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2 . The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10 -8 W/m2 .K4 ) (A) 1000 (B) 727 (C) 800 (D) 1200

Last Answer : (A) 1000

Pick out the wrong statement: (A) With change in temperature, the radiant energy emitted by a black body remains unchanged (B) Absorptivity of a body approaches unity in case of diffuse reflection (C) Absorptivity of a perfectly black body is unity (D) Value of Stefan-Boltzmann constant is 4.876 × 10 -8 KCal/m2 .hr.°K4

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Last Answer : (A) With change in temperature, the radiant energy emitted by a black body remains unchanged

The value of Stefan-Boltzmann constant in SI unit is (A) 5.6697 × 10 -8W/m2 .°K4 (B) 0.1714 × 10 -8W/m2 .°K4 (C) 5.6697 × 10 -8kcal/m2 . °K4 (D) 0.1714 × 10 -8kcal/m2 . °K4

Description : The value of Stefan-Boltzmann constant in SI unit is (A) 5.6697 × 10 -8W/m2 .°K4 (B) 0.1714 × 10 -8W/m2 .°K4 (C) 5.6697 × 10 -8kcal/m2 . °K4 (D) 0.1714 × 10 -8kcal/m2 . °K4

Last Answer : (A) 5.6697 × 10 -8W/m2 .°K4

In Fourier's law, the proportionality constant is called the (A) Heat transfer co-efficient (B) Thermal diffusivity (C) Thermal conductivity (D) Stefan-Boltzmann constant

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Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) (A) t 4 (B) T 4 (C) 1/t 4 (D) 1/T 4

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Last Answer : (B) T

Stefan-Boltzmann law applies to __________ body. (A) Black (B) White (C) Grey (D) Any colour

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Which one gives the monochromatic emissive power for black body radiation? (A) Planck's law (B) Kirchhoff’s law (C) Wien's law (D) Stefan-Boltzmann law

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Last Answer : (A) Kirchoff’s

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Last Answer : Stefan-Boltzmann law

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Description : What is Boltzmann Constant ?

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The statement that "maximum wavelength of radiation is inversely proportional to the temperature" is __________ law. (A) Stefan-Boltzmann’s (B) Planck's (C) Wien's displacement (D) None of these

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Last Answer : (C) Wien's displacement

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

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

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The film penetration model of mass transfer was enunciated by (A) Gilliland (B) Toor and Marcello (C) Stefan (D) Fick

Description : The film penetration model of mass transfer was enunciated by (A) Gilliland (B) Toor and Marcello (C) Stefan (D) Fick

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On which of the following variables heat convected depends ? (a) Power density (b) Temperature difference between heated surface and coolant (c) Thermal resistivity, density, specific heat (d) Gravitational constant (e) All ofthe above

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Last Answer : (e) All ofthe above

“The total volume of a mixture of non-reacting gases is equal to the sum of the partial volumes.” This statement is known as ______.  A. Law of Dulong and Petit  B. Maxwell-Boltzmann law  C. Amagat’s law  D. Avogadro’s law

Description : “The total volume of a mixture of non-reacting gases is equal to the sum of the partial volumes.” This statement is known as ______.  A. Law of Dulong and Petit  B. Maxwell-Boltzmann law  C. Amagat’s law  D. Avogadro’s law

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Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the (A) State or manner of application of the crushing force (B) Ultimate strength of the material (C) Elastic constant of the material (D) All (A), (B) and (C)

Description : Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the (A) State or manner of application of the crushing force (B) Ultimate strength of the material (C) Elastic constant of the material (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Where can i find and english copy of Stefan Zweig's "World of Yesterday"?

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what is the name of the part in the vampire diaries where katherine jumps out of the church and stefan saves her?

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Last Answer : Answer : d

Temperature of the product during ultrafine grinding (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the material being ground

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At constant pressure, with increase of temperature, the dew point will (A) Increase (B) Decrease (C) Remain unchanged (D) Increase/decrease; depends on the temperature

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At constant temperature, the thermal conductivities of gases__________ with rise in pressure.(A) Decrease(B) Increase(C) Remain unchanged(D) May increase or decrease; depends on the pressure

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Last Answer : (A) Decrease

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Last Answer : (D) May increase or decrease; depends on the material

With increase in the temperature, viscosity of a liquid (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the liquid

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The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated. (A) Decreases (B) Increases (C) Remain constant (D) May increase or decrease; depends on the chemical characteristics of polluted water

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The rate constant of a first order reaction depends on the (A) Concentration of the reactant (B) Temperature (C) Concentration of the product (D) Time

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In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3 ), the value of the equilibrium constant depends on the (A) Total pressure of the system (B) Volume of the reactor (C) Temperature (D) Initial concentration of N2 and H2

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Specific rate constant for a second order reaction (A) Is independent of temperature (B) Varies with temperature (C) Depends on the nature of the reactants (D) Both (B) and (C)

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The rate constant of a reaction depends on the (A) Initial concentration of reactants (B) Time of reaction (C) Temperature of the system (D) Extent of reaction

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The rate constant of a reaction depends on the (A) Initial concentration of reactants (B) Time of reaction (C) Temperature of the system (D) Extent of reaction

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With increase in temperature, the rate constant obeying Arrhenius equation (A) Increases (B) Decreases (C) Decreases exponentially (D) Can either increase or decrease; depends on the frequency factor

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Last Answer : (C) Decreases exponentially

The equilibrium constant ‘K’ of a chemical reaction depends on (A) Temperature only (B) Pressure only (C) Temperature and pressure (D) Ratio of reactants

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The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv ), depends upon its (A) Pressure (B) Volume (C) Temperature (D) All (A), (B) & (C)

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Pick out the wrong statement. (A) The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction (B) With increase in temperature, the equilibrium constant increases for an exothermic reaction (C) The equilibrium constant of a reaction depends upon temperature only (D) The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

Description : Pick out the wrong statement. (A) The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction (B) With ... phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

Last Answer : (B) With increase in temperature, the equilibrium constant increases for an exothermic reaction

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 : 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

depends upon The Chezy’s constant C in the formula V = C A. Size of the sewer B. Shape of the sewer C. Roughness of sewer surface D. All the above

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Last Answer : ANS: D

What is the dependence of mechanical force per unit area of charged conductor on the surface charge density and the dielectric constant of the medium

Description : What is the dependence of mechanical force per unit area of charged conductor on the surface charge density and the dielectric constant of the medium

Last Answer : What is the dependence of mechanical force per unit area of charged conductor on the surface charge density and the dielectric constant of the medium

The actual temperature drop across the heating surface in an evaporator depends on the (A) Feed (B) Depth of liquid over heating surface (C) Pressure difference between steam chest and vapour space (D) All (A), (B) and (C)

Description : The actual temperature drop across the heating surface in an evaporator depends on the (A) Feed (B) Depth of liquid over heating surface (C) Pressure difference between steam chest and vapour space (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The actual temperature drop across the heating surface of an evaporator depends on the (A) Liquid depth over the heating surface (B) Solution being evaporated (C) Pressure difference between the steam chest and the vapor space above the boiling liquid (D) All (A), (B) and (C)

Description : The actual temperature drop across the heating surface of an evaporator depends on the (A) Liquid depth over the heating surface (B) Solution being evaporated (C) Pressure difference between the steam chest and the vapor space above the boiling liquid (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The heating capacity of muffle furnace depends on the (A) Surface area & emissivity of the stock (B) Properties of the muffle wall (temperature, area, and emissivity) (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : The heating capacity of muffle furnace depends on the (A) Surface area & emissivity of the stock (B) Properties of the muffle wall (temperature, area, and emissivity) (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

The heating capacity of continuous reheating furnace depends upon the (A) Hearth area and furnace temperature (B) Emissivity of the stock (C) Ratio of wall surface to stock surface (D) All (A), (B) and (C)

Description : The heating capacity of continuous reheating furnace depends upon the (A) Hearth area and furnace temperature (B) Emissivity of the stock (C) Ratio of wall surface to stock surface (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Wavelength of radiation emitted by a body depends on the __________ of its surface. (A) Temperature (B) Area (C) Nature (D) All 'a', 'b' & 'c'

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Last Answer : Option

. 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 : . 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

Extensive 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 dependent on the path followed but on the state  (d) is dependent on the path followed and not on the state  (e) is always constant.

Description : Extensive 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 ... the state  (d) is dependent on the path followed and not on the state  (e) is always constant.

Last Answer : Answer : a

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 dependent on the path followed but on the state  (d) is dependent on the path followed and not on the state  (e) remains constant.

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.

Last Answer : Answer : b

For a given liquid, the rate of evaporation depends on 1. the temperature of the liquid 2. the temperature of air 3. the surface area of the liquid Which of the above factors is/are correct? (a) 1 only (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3

Description : For a given liquid, the rate of evaporation depends on 1. the temperature of the liquid 2. the temperature of air 3. the surface area of the liquid Which of the above factors is/are correct? (a) 1 only (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3

Last Answer : Ans:(d)

Rate of cooling depends on the (1) Temperature difference between the body and the surroundings (2) Nature of the radiating surface (3) Area of the radiating surface (4) All of these

Description : Rate of cooling depends on the (1) Temperature difference between the body and the surroundings (2) Nature of the radiating surface (3) Area of the radiating surface (4) All of these

Last Answer : (4) All of these Explanation: Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the ... Specific heat of the radiating body; Temperature of radiating body and ♦ Temperature of the surrounding.