Description : SI unit of luminous intensity is ______. (1) lumen (2) lux (3) candela (4) watt
Last Answer : (3) candela Explanation: Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a ... the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd).
Description : A 60W lamp is rated at 0.8 watt/candela. Calculate (i) luminous intensity of the lamp, (ii) luminous flux of the lamp, and (iii) illuminance at a dist
Last Answer : A 60W lamp is rated at 0.8 watt/candela. Calculate (i) luminous intensity of the lamp, (ii) ... iii) illuminance at a distance of 2m from the lamp.
Description : The SI unit of luminous emittance is - (1) Lux (2) Candela (3) Lumen (4) Lumen second
Last Answer : (1) Lux Explanation: The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a ... of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
Description : The SI unit of luminous emittance is : (1) Lux (2) Candela (3) Lumen (4) Lumen second
Last Answer : Lux
Description : Lux is the SI unit of - (1) intensity of illumination (2) luminous efficiency (3) luminous flux (4) luminous intensity
Last Answer : (1) intensity of illumination Explanation: The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m2.
Description : Unit of luminous intensity is A. m B. kg C. cd D. mol
Last Answer : . m
Description : Light intensity is generally described in terms of __________ and measured in _________. ∙ A. Luminous flux density; Lumens per unit area ∙ B. Luminous flux intensity; Lumens per unit area ∙ C. Luminous flux density; Lumens per unit volume ∙ D. Luminous flux intensity; Lumens per unit volume
Last Answer : Luminous flux density; Lumens per unit area
Description : Calculate the intensity of illumination at a distance of 0.5m from a source of light of power 200 candela assuming normal incidence.
Last Answer : Calculate the intensity of illumination at a distance of 0.5m from a source of light of power 200 candela assuming normal incidence.
Description : Planets do not twinkle because they (a) emit light continuously (b) are luminous sources of light (c) are nearer to us and therefore their light does not pass through the atmosphere (d) are nearer to us and therefore minor variations in their intensity are not noticeable
Last Answer : Ans:(d)
Description : Calculate the illuminance at a surface distance 0.5m from a ligth source of luminous intensity 200 cd, assuming normal incidence. If the area of the s
Last Answer : Calculate the illuminance at a surface distance 0.5m from a ligth source of luminous intensity 200 cd, ... , what is the luminous flux on this area ?
Description : The luminous effeciency of a lamp is `51mW^(-1)` and its luminous intensity is 35 cd. Determine the power of the lamp.
Last Answer : The luminous effeciency of a lamp is `51mW^(-1)` and its luminous intensity is 35 cd. Determine the power of the lamp.
Description : Define the following terms and state their units: (i) Luminous intensity, (ii) Luminous flux
Last Answer : i) Luminous intensity: This is defined as the luminous flux emitted into a solid angle of space in a specific direction. Its unit is the candela. OR The luminous flux per unit solid angle ( ... energy radiated by the light source in all direction. The unit of luminous flux is lumen (lm)
Description : Combustion of pulverised coal as compared to that of lump coal (A) Develops a non-luminous flame (B) Develops a low temperature flame (C) Can be done with less excess air (D) Provides a lower rate of heat release
Last Answer : (C) Can be done with less excess ai
Description : The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that (a) carnot cycle can't work with saturated steam (b) heat is supplied to water at temperature ... heat at two places (d) rankine cycle is hypothetical (e) none of the above.
Last Answer : Answer : b
Description : Entropy change depends on (a) heat transfer (b) mass transfer (c) change of temperature (d) thermodynamic state (e) change of pressure and volume.
Last Answer : Answer : a
Description : Energy can neither be created nor destroyed but can be converted from one form to other is inferred from (a) zeroth low of thermodynamic (b) first law of thermodynamics (c) second law to thermodynamics (d) basic law of thermodynamics (e) claussius statement.
Description : What is the unit of luminous efficiency of an electric bulb? -Do You Know?
Last Answer : answer:
Description : What is the unit of luminous efficiency of an electric bulb?
Last Answer : Lumen / watt
Description : Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C ... in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod
Last Answer : (C) Enzymes help in increasing the activation energy of the reaction
Description : 1 What is Candela ?
Last Answer : At the pressure of 101325 pascals in the freezing point of platinum (2042 Kelvin) the illuminating power along the perpendicular to the surface of a measured area of ' 1/600000 ' square meter of a black object is called 1 Candela .
Description : What is Candela ?
Last Answer : : If a steroidian emits a radiation intensity of 683 parts per watt from a light source in a cube, then the intensity of that light is a Candela.
Description : What is the symbol of Candela ?
Last Answer : candela symbol cd
Description : What is the level of Candela ?
Last Answer : Candela Dimensions J.
Last Answer : Candela is the unit of radiant intensity.
Description : Classify the following units into fundamental, supplementary and derived units: newton, metre, candela
Last Answer : Classify the following units into fundamental, supplementary and derived units: newton, metre, candela, ... , volt, mol, coulomb, farad, steradian.
Description : A good photographic print is obtained by an exposure of 2s at a distance of 1m from a 60 candela lamp. What time of exposure must be given to get equa
Last Answer : A good photographic print is obtained by an exposure of 2s at a distance of 1m from a 60 candela lamp ... at a distance of 2m from a 200 cadela lamp ?
Description : Which term is not associated with sound wave? (1) Hertz (2) Decibel (3) Candela (4) Mach
Last Answer : (3) Candela Explanation: Candela is the standard unit of luminous intensity, the luminous power per unit solid angle emitted by a point light source in a particular direction, in the International System of Units. The word candela means candle in Latin.
Last Answer : Candela
Description : Temperature of distant luminous bodies can be determined by (1) Mercury thermometers (2) Gas thermometers (3) Pyrometers (4) Colour thermometers
Last Answer : Pyrometers
Description : In case of a close thermodynamic system, there is __________ across the boundaries. (A) No heat and mass transfer (B) No mass transfer but heat transfer (C) Mass and energy transfer (D) None of these
Last Answer : (B) No mass transfer but heat transfer
Description : When an isolated thermodynamic system executes a process, (A) Work is done (B) Heat transfer takes place (C) Mass flow occurs across the boundary of the system (D) No chemical reaction takes place within the system
Last Answer : D) No chemical reaction takes place within the system
Description : Which of the following thermodynamic devices operates the reverse of the heat engine? a. Thermal pump b. Thermal evaporator c. Thermal condenser d. Thermal equilibrant
Last Answer : Thermal pump
Description : Is a thermodynamic system that operates continuously with only energy (heat and work) crossing its boundaries? a. Heat Engine b. Heat Reservoir c. Heat Source d. Heat Sink
Last Answer : Heat Engine
Description : The area under the temperatureentropy curve (T – s curve) of any thermodynamic process represents A. heat absorbed B. heat rejected C. either (a) or (b) D. none of these
Last Answer : C. either (a) or (b)
Description : First law of thermodynamics furnishes the relationship between (a) heat and work (b) heat, work and properties of the system (c) various properties of the system (d) various thermodynamic processes (e) heat and internal energy.
Last Answer : (b) heat, work and properties of the system
Description : What is the thermodynamic STATE function that is directly associated with a constant pressure process in which heat is exchanged between system and surroundings?
Last Answer : ANSWER: DELTA H
Description : Decibel is the unit of ______. (1) Speed of light (2) Intensity of sound (3) Intensity of heat (4) None of these
Last Answer : (2) Intensity of sound Explanation: Decibel (dB) unit is used for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.
Description : Decibel is the unit used for – (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency
Last Answer : (3) Intensity of sound Explanation: The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly ... of a physical quantity (usually power or intensity) relative to a specified or implied reference level.
Description : Decibel is the unit used for (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency
Last Answer : Intensity of sound
Description : The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system. A. is equal to B. is not equal to
Last Answer : Answer: B
Description : Thermodynamic equilibrium constant in a system is affected by (A) Inerts (B) Pressure (C) Temperature (D) All (A), (B) & (C)
Last Answer : (C) Temperature
Description : Extensive properties of a thermodynamic system depend upon the __________ of the system. (A) Specific volume (B) Temperature (C) Mass (D) Pressure
Last Answer : (C) Mass
Description : Which of the following is a thermodynamic property of a system? (A) Concentration (B) Mass (C) Temperature (D) Entropy
Last Answer : (D) Entropy
Description : Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics. (A) 1st (B) Zeroth (C) 3rd (D) None of these
Last Answer : B) Zeroth
Description : For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot? (A) Temperature - entropy (B) Temperature - pressure (C) Enthalpy - entropy
Last Answer : (A) Temperature - entropy
Description : The state of a thermodynamic system is always defined by its: a. Absolute temperature b. process c. properties d. temperature and pressure
Last Answer : properties
Description : Which of the following is not a thermodynamic property? a. Pressure b. Temperature c. Volume d. Phase
Last Answer : Phase
Description : The Law of Thermodynamics that provides the basis for measuring the thermodynamic property of temperature. a. Charle’s Law b. Boyle’s Law c. Zeroth Law d. Gas Law
Last Answer : Zeroth Law
Description : What is the thermodynamic temperature scale in the English system? A. Kelvin scale B. Celsius scale C. Fahrenheit scale D. Rankine scale
Last Answer : Rankine scale
Description : What is the thermodynamic temperature scale in the SI system? A. Kelvin scale B. Celsius scale C. Fahrenheit scale D. Rankine scale
Last Answer : Kelvin scale