Thermal Properties of Matter questions
823 published questions with worked solutions.
- Three discs x, y and z having radii 2 m, 3 m and 6 m respectively are coated on outer surfaces. The wavelength corresponding to...
- About a black body radiation, which one of the following is the WRONG statement?
- Two metal slabs of same cross-sectional area have thickness 'd_ 1 ' and 'd_ 2 ' and thermal conductivities 'K_ 1 ' and 'K_ 2 '...
- Compare the rate of loss of heat from a metal sphere at 627^ with the rate of loss of heat from the same sphere at 327^ , if the...
- The volume of a metal block increases by 0.225% when its temperature is increased by 30^ . Hence the coefficient of linear...
- A composite slab consists of two materials having coefficient of thermal conductivity K and 2K, thickness x and 4x respectively....
- A black rectangular surface of area A emits energy E per unit time at 27^ C. If length and breadth is reduced to ( 1 4 )th of...
- Rate of radiation by a black body is 'R' at temperature 'T'. Another body has same area but emissivity is 0.2 and temperature 3T....
- Which one of the following is based on convection?
- A black body at temperature 127^ radiates heat at the rate of 5 cal/cm^2s. At a temperature 927^ , its rate of emission in units...
- A body is said to be opaque to the radiation if (a, r and t are coefficient of absorption, reflection and transmission...
- A sphere, a cube and a thin circular plate all made of same material and having the same mass are heated to same temperature of...
- The energy spectrum of a black body exhibits a maximum around a wavelength . The temperature of a black body is now changed such...
- A black rectangular surface of area A emits energy E per second at 127^o C. If length and breadth is reduced to half of initial...
- About black body radiation, which one of the following is a WRONG statement?
- A black disc has a radius 'R' and wavelength corresponding to the maximum intensity is ' '. The emissive power (E) for the...
- An ordinary body cools from 4 to 3 in 't' minutes. The temperature of the body after next 't' minutes is (Assume Newton's law of...
- A sheet of steel is 40 cm long and 5 cm broad at 0^ . The surface area of the sheet increases by 1.4 cm ^2 at 100^ . Coefficient...
- A bowl filled with very hot water cools from 98^ to 86^ in 2 minutes when the room temperature is 22^ . How long it will take to...
- The energy' spectrum of a black body exhibits a maximum around a wavelength ' '. The temperature of the black body is now changed...
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