Description : The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law. (A) Kirchoff’s (B) Planck's (C) Wien's displacement (D) Stefan-Boltzmann
Last Answer : (A) Kirchoff’s
Description : When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called A. Zeroth law of thermodynamics B. First law of thermodynamics C. Second law of thermodynamics D. Kelvin Planck’s law
Last Answer : A. Zeroth law of thermodynamics
Description : Planck's constant was first introduced in order to obtain a correct theoretical prediction of: w) the distribution of frequencies occurring in black body radiation. x) the energy produced by the transformation of mass into energy. y) the speed of light. z) lifetime of the neutron.
Last Answer : ANSWER: W -- THE DISTRIBUTION OF FREQUENCIES OCCURRING IN BLACK BODY RADIATION
Description : 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
Last Answer : (A) Planck's law
Description : 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
Last Answer : (C) Wien's displacement
Description : Stefan's block body radiation law can also be derived from __________ law. (A) Kirchoff’s (B) Planck's (C) Fourier's (D) None of these
Last Answer : (B) Planck's
Description : A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun? (A) Yellow paint (B) White paint (C) Black paint (D) Grey paint
Last Answer : (C) Black paint
Description : All the six faces of a cube of a cube are coloured with six different colours - black, brown, green, red, white and blue. 1. Red face is opposite to the black face. 2. Green face is between red and black ... face is in the bottom. Which face is opposite to green ? (a)Red (b)white (c) blue (d)brown
Last Answer : (c) blue
Description : All the six faces of a cube of a cube are coloured with six different colours - black, brown, green, red, white and blue. 1. Red face is opposite to the black face. 2. Green face is between red and black faces ... , brown, red (b) Blue, black, red, white (c) Red, black, blue, white (d) None of these
Last Answer : (a) Black, white, brown, red
Description : Bohr's theory of fixed orbits contradicts (a) Coulomb's law (b) Planck's theory (c) de Broglie relation (d) Uncertainty principle
Last Answer : Ans:(d)
Description : At Equilibrium, the radiation emitted must equal the radiation absorbed. a. Boyle’s Law b. Planck’s Law c. Kirchoff’s Law d. Joule’s Law
Last Answer : Kirchoff’s Law
Description : Kelvin-Planck’s law deals with A. conservation of work B. conservation of heat C. conversion of heat into work D. conversion of work into heat
Last Answer : Answer: C
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 : Kelvin Planck’s law deals with (a) conservation of heat (b) conservation of work (c) conversion of heat into work (d) conversion fo work into heat (e) conservation of mass.
Last Answer : Answer : c
Description : The unity of Planck's constant 'h' in the equation, E = hv is (A) J/s (B) J.S (C) J/kmol (D) kmol/J
Last Answer : (B) J.S
Description : Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials. (A) Adsorbs (B) Oxidises (C) Reduces (D) Converts
Last Answer : (A) Adsorbs
Description : Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass. (A) Chromium (B) Arsenic (C) Copper (D) Manganese
Last Answer : (C) Copper
Description : Stefan-Boltzmann law applies to __________ body. (A) Black (B) White (C) Grey (D) Any colour
Last Answer : (A) Black
Description : The expression for entropy change, ΔS = n Cp. ln (T2/T1), is valid for the __________ of a substance. (A) Simultaneous pressure & temperature change (B) Heating (C) Cooling (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : Infrared rays are absorbed best by which one of the following. Is it: w) bodies of air x) white bodies with rough surfaces y) mirrors z) black bodies with rough surfaces
Last Answer : ANSWER: Z -- BLACK BODIES WITH ROUGH SURFACES
Description : Is there a design format that allows you to place a logo in Word on a coloured background, without a white box around the logo?
Last Answer : I was going to recommend .gif or .png, until I realized you had tried that. I'm not sure why .gif and .png don't work, because they do for me. Are you sure transparency exists in the ... format picture tools and set a transparent color (note that it will take out that color everywhere in the logo).
Description : I am a window, I am a lamp, I am clouded, I am shining, and I am coloured; set in white, I fill with water and overflow. I say much, but I have no words. What am I? -Riddles
Last Answer : I am an eye.
Description : Before X-ray examination (coloured Xray) of the stomach, patients are given suitable salt of barium because. (1) barium is a good absorber of X-rays and helps stomach to appear clearly (2) barium ... clearly (3) barium allows X-rays to pass through the stomach (4) barium salts are easily available
Last Answer : (1) barium is a good absorber of X-rays and helps stomach to appear clearly
Description : A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them? (a) Mutated (b) Embolised (c) Etiolated (d) Defoliated
Last Answer : (c) Etiolated
Description : The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as (A) Chromatic aberration (B) Spherical aberration (C) Astigmatism (D) Coma
Last Answer : (A) Chromatic aberration
Description : The commercial name of white and coloured cement in India, is (A) Colorcrete (B) Silvicrete (C) Snowcem (D) All the above
Last Answer : Answer: Option D
Description : In the case of peppered moth (Biston betularia) the black-coloured from became dominant over the light-coloured form in England during industrial revo
Last Answer : In the case of peppered moth (Biston betularia) the black-coloured from became dominant over the ... due to very poor sunlight D. Protective mimicry
Description : In the case of peppered moth (Biston betularia) the black-coloured form became dominant over the light-coloured form in England during industrial revolution. This is an example of (a) ... acquired due to the darker environment (d) natural selection whereby the darker forms were selected.
Last Answer : (d) natural selection whereby the darker forms were selected.
Description : A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height. 17. Two faces measuring 4 cm x 1 cm are coloured in black. 18. Two faces measuring 6 cm x 1 cm are coloured in red. 19. Two faces ... colour on two sides and rest of the four sides having no colour ? (a)12 (b)10 (c)8 (d)4
Last Answer : Answer key : (c)
Description : A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height. 12. Two faces measuring 4 cm x 1 cm are coloured in black. 13. Two faces measuring 6 cm x 1 cm are coloured in red. 14. Two ... How many cubes will have 4 coloured sides and two non-coloured sides ? (a)8 (b)4 (c)16 (d)10
Last Answer : Answer key : (b)
Description : A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height. 7. Two faces measuring 4 cm x 1 cm are coloured in black. 8. Two faces measuring 6 cm x 1 cm are coloured in red. 9. Two faces measuring ... 1 cm(from 4 cm side). How many small cubes will be formed? (a)6 (b)12 (c)16 (d)24
Last Answer : Answer key : (d)
Description : A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height. 2. Two faces measuring 4 cm x 1 cm are coloured in black. 3. Two faces measuring 6 cm x 1 cm are coloured in red. 4. Two faces ... and black colours on at least one side of the cube will be formed? (a)16 (b)12 (c)10 (d)4
Description : Planck's universe, cube or sphere?
Last Answer : The problem with spheres is they don’t pack tightly together; they leave odd spaces in between which presumably cannot be smaller than the Planck length.
Description : What is Planck's equation?
Last Answer : The relation between the energy (E) of a photon and the frequency (v) of its associated electromagnetic wave is called the Planck relation or the Planck--Einstein equation:E = hvh is the Planck constant which as a value of about 6.626 * 10-34 J*s (a very very small number)
Description : What is Planck's constant?
Last Answer : Planck's constant describes the ratio between the energy of an electromagnetic wave and the frequency of that wave.
Description : What is the physical significance of Planck's constant?
Last Answer : Planck's Constant signifies the Photon Charge, and the Aether of "free space'. Photon energy is E=hf =hc/r = Q2zc/r and Q is the photon charge in Coulombs.. Planck's Constant is also related to the free space impedance ... 4)2= 1/2(.12)2= 1/2 (.0144)=7.2E-3. I believe that the electron is an effect
Description : Out of the following pairs, which one does not have identical dimension? (1) Moment of inertia and moment of a force (2) Work and Torque (3) Angular momentum and Planck's constant (4) Impulse and Momentum
Last Answer : (1) Moment of inertia and moment of a force
Description : The unit of Planck's constant is – (1) Js (2) Js⁻² (3) J/s (4) Js²
Last Answer : (1) Js Explanation: The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
Description : The energy of the photon is ∙ a. Directly proportional to its bandwidth ∙ b. Directly proportional to the Planck’s constant ∙ c. Directly proportional to Boltzmann’s constant ∙ d. Inversely proportional to the Planck’s constant
Last Answer : Directly proportional to the Planck’s constant
Description : The product of uncertainties of two physical observables must be approximately equal to a)Coulomb’s constant K b) Rydberg’s constant R c)Planck’s constant d)All of the above
Last Answer : c)Planck’s constant
Description : The SI unit of Planck’s constant is a) Joule – Sec-1 b) Joule – Sec-2 c) Joule – Sec d) Joule – Sec2
Last Answer : c) Joule – Sec
Description : he dipole magnetic moment (μ) is directly proportional to nuclear spin (I), connected by a constant called the A. Gyromagnetic ratio (γ) B. Planck's constant (h) C. Nuclear susceptibility (χ) D. Chemical shift (δ)
Last Answer : Gyromagnetic ratio (γ)
Description : What is the DeBroglie wavelength of a 1,200 kilogram corvette traveling at a rate of 25 meters per second? Planck's constant is equal to 6.62 x 10-34 Joule-seconds. w) 5.3 x 10-32 meters x) 5.9 x 10-34 meters y) 2.1 x 10-38 meters z) 1.6 x 10-40 meters
Last Answer : ANSWER: Y -- 2.1 x 10-38 METERS
Description : A __________ surface has the maximum thermal emissivity out of the following. (A) Black & smooth (B) Black & rough (C) White & smooth (D) White & rough
Last Answer : (B) Black & rough
Description : The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law. (A) Exponential (B) Parabolic (C) Linear (D) Cubic
Last Answer : (A) Exponential
Description : If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ ... (A) Hyperbolic (B) Parabolic (C) Linear (D) Logarithmic
Last Answer : (C) Linear
Description : If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law. (A) Parabolic (B) Hyperbolic (C) Linear (D) Logarithmic
Last Answer : (A) Parabolic
Description : Pascal's law is valid, only when the fluid is (A) Frictionless and at rest (B) At rest (C) At rest and when the frictionless fluid is in motion (D) None of these
Last Answer : (B) At rest
Description : Stoke's law is valid, when NRe, p is less than (A) 2 (B) 100 (C) 2100 (D) 700
Last Answer : (A) 2