Description : A light year is a unit of – (1) time (2) distance (3) speed of light (4) intensity of light
Last Answer : (2) distance Explanation: As defined by the International. Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. It is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).
Description : Watt is a unit of - (1) Time (2) Power (3) Light (4) intensity of light
Last Answer : (2) Power
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 : Dioptere is the unit of – (1) power of a lens (2) focal length of a lens (3) light intensity (4) sound intensity
Last Answer : (1) power of a lens
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 : Dioptere is the unit of (1) power of a lens (2) focal length of a lens (3) light intensity (4) sound intensity
Last Answer : power of a lens
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 : A light year is a unit of: (1) Time (2) Distance (3) Intencity of Light (4) Frequency
Last Answer : (2) Distance Explanation: A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
Description : Light year is a unit of – (1) Light (2) Current (3) Distance (4) Time
Last Answer : (3) Distance Explanation: A light-year is a unit of length used informally to express astronomical distances. It is equal to just under 10 trillion kilometres.
Description : Light year is a unit of (1) Light (2) Current (3) Distance (4) Time
Last Answer : Distance
Description : The mean distance from the Sun to the Earth is called: (1) Light year (2) Astronomical Unit (3) Parallactic Second (4) Angstrom
Last Answer : (2) Astronomical Unit Explanation: The distance from the Earth to the Sun on average is about 149 million km which is often referred to as Astronomical Unit. 1 AU = 149 million km.
Description : Which among the following is not a unit of distance? (1) Light year (2) Longsec (3) Astronomical unit (4) Parsec
Last Answer : (2) Longsec Explanation: Longsec is unit of parse, parse is used to allocate distance to astronomical bodies beyond the solar system.
Description : Light year is the unit of - (1) Frequency (2) Distance (3) Energy (4) Power
Description : Ondometer is a - (1) Measuring instrument for distance covered by motor wheels (2) Measuring instrument for frequency of electromagnetic waves (3) Device for measuring sound intensity (4) Measuring instrument for electric power
Last Answer : (2) Measuring instrument for frequency of electromagnetic waves
Description : Stars twinkle but planets do not twinkle because - (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away ... and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
Last Answer : (4) they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable Explanation: Eris is the most massive and second-largest ... orbiting the Sun, and the largest known body in the Solar System not visited by a spacecraft.
Description : Stars twinkle but planets do not twinkle because (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away from ... and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
Last Answer : they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
Description : At what distance form a light source of 64 cd, will the intensity of illumination because 4 flux ?
Last Answer : At what distance form a light source of 64 cd, will the intensity of illumination because 4 flux ?
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 : What is the unit of intensity of sound in Si method ?
Last Answer : The unit of sound intensity in the Si method is Wm ^ -2
Description : Curie is an unit of – (1) Radioactivity (2) energy of Gamma rays (3) intensity of Gamma rays (4) work function
Last Answer : (1) Radioactivity Explanation: The curie (symbol Ci) is a non-SI unit of radioactivity, named 'in honour of Pierre Curie. It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)".
Description : Hertz is a unit for measuring – (1) Intensity of waves (2) Frequency of waves (3) Wavelength (4) Clarity of waves
Last Answer : (2) Frequency of waves
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 : Sound energy passing per second through a unit area held perpendicular is called - (1) Intensity (2) Frequency (3) Amplitude (4) Quality
Last Answer : (1) Intensity Explanation: Sound energy passes through a unit area held perpendicular to the direction of propagation of sound waves is called intensity of sound.
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 : Curie is an unit of (1) Radioactivity (2) energy of Gamma rays (3) intensity of Gamma rays (4) work function
Last Answer : Radioactivity
Description : Hertz is a unit for measuring (1) Intensity of waves (2) Frequency of waves (3) Wavelength (4) Clarity of waves
Last Answer : Frequency of waves
Description : ‘Therm' is the unit of – (1) Power (2) Heat (3) Light (4) Distance
Last Answer : (2) Heat Explanation: Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as ... to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
Description : ‘Therm’ is the unit of (1) power (2) heat (3) light (4) distance
Last Answer : heat
Description : What is the symbol of the unit of light intensity ?
Last Answer : The symbol of the unit of light intensity Cd.
Description : The modern unit of intensity of light is ______.
Last Answer : The modern unit of intensity of light is ______. A. lumen B. candle power C. lux D. All the above.
Description : Plants adapted to low light intensity have (a) larger photosynthetic unit size than the sun plants (b) higher rate of CO2 fixation than the sun plants (c) more extended root system (d) leaves modified to spines.
Last Answer : (a) larger photosynthetic unit size than the sun plants
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 : What is the level of light intensity ?
Last Answer : H Revelation intensity level.
Description : Which of the following is a symbol of light intensity ?
Last Answer : Cd Revelation is a symbol of intensity unit.
Last Answer : Revelation intensity level J
Description : Red light is used for signals because it has – (1) long wavelength (2) high intensity (3) high frequency (4) low refraction in the medium
Last Answer : (1) long wavelength Explanation: Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is ... the colours and is able to travel the longest distance through fog, rain, and the alike.
Description : Decibel is used to measure the intensity of - (1) Magnetic field (2) Sound (3) Light (4) Heat
Last Answer : (2) Sound Explanation: The decibel (dB) is used to measure sound level, but it is also widely used in electronics, signals and communication.
Description : When a certain beam of light falls upon a metal surface, it ejects photoelectrons from it. The number of photoelectrons ejected per second by the beam of light depends upon one of the following. Is it ... the work function of the metal y) the frequency of the beam z) the intensity of the beam
Last Answer : ANSWER: Z -- THE INTENSITY OF THE BEAM
Description : The energy associated with one photon of a light beam is proportional to one of the following. Is it proportional to: w) the intensity of the light source from which it came x) the number of photons in the beam y) the frequency of the photon z) the speed of the photon
Last Answer : ANSWER: Y -- THE FREQUENCY OF THE PHOTON
Description : When a beam of ordinary white light is passed through a Polaroid plate filter, the intensity of the beam that emerges is: w) equal to that of the incident beam x) about 0.9 that of the incident beam y) about one-half that of the incident beam z) practically zero
Last Answer : ANSWER: Y -- ABOUT ONE-HALF THAT OF THE INCIDENT BEAM
Description : Red light is used for signals because it has (1) long wavelength (2) high intensity (3) high frequency (4) low refraction in the medium
Last Answer : long wavelength
Description : Which astronomical unit os distance is greater, a parsec or a light year?
Last Answer : A parsec
Description : A light year is the unit of _____. A. Light B. Distance C. Speed D. Space
Last Answer : ANSWER: B
Description : Unit of distance used in navigation is (a) Nautical mile (b) Kilometre (c) Light year (d) Yard
Last Answer : Ans:(a)
Description : The unit of astronomical distance is the (a) angstrom (b) kilometre (c) nautical mile (d) light year
Last Answer : Ans:(d)
Description : Which one of the following is not a unit of distance? A. Parsec B. Astronomical Unit C. Light Year D. Foot Candle (Answer)
Last Answer : D. Foot Candle (Answer)
Description : Which of the following is not the unit of distance? (A) Angstrom (B) Light year (C) Micron (D) Milestone
Last Answer : (D) Milestone
Description : A light year is a measure of : (1) Speed (2) Velocity (3) Distance (4) Time
Last Answer : (3) Distance Explanation: A light-year is a unit of length equal to just under 10 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (TAU), a ... lightyear is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).