Heat flows from one body to other when they have Different atomic structure Different heat contents Different temperatures Different specific heat TRUE ANSWER : ? YOUR ANSWER : ?
Cork is a good insulator because it has Low density Atoms colliding frequency Free electrons Porous body TRUE ANSWER : ? YOUR ANSWER : ?
Temperature of steam at around 540°C can be measured by Thermocouple Thermometer None of these Thermistor TRUE ANSWER : ? YOUR ANSWER : ?
Absorptivity of a body will be equal to its emissivity When system is under thermal equilibrium At critical temperature At all temperatures At one particular temperature TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is expected to have highest thermal conductivity? Solid ice Steam Melting ice Water TRUE ANSWER : ? YOUR ANSWER : ?
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a Black body Grey body Red hot body Brilliant white polished body TRUE ANSWER : ? YOUR ANSWER : ?
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the Grashoff's number Reynold's number, Grashoff's number Reynold's number Prandtl number, Grashoff's number TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following would lead to a reduction in thermal resistance? In conduction, reduction in the thickness of the material and an increase in thermal conductivity. All of these In radiation, increasing the temperature and reducing the emissivity. In convection, stirring of the fluid and cleaning the heating surface. TRUE ANSWER : ? YOUR ANSWER : ?
Unit of thermal conductivity in S.I. units is W/m °K J/m² sec Option (B) and (C) above J/m °K sec TRUE ANSWER : ? YOUR ANSWER : ?
The energy distribution of an ideal reflector at higher temperatures is largely in the range of Longer wavelength Shorter wavelength Remain same at all wavelengths Wavelength has nothing to do with it TRUE ANSWER : ? YOUR ANSWER : ?