Heat And Thermodynamics QUESTIONS AND ANSWERS

IIT JEE : Heat And Thermodynamics QUESTIONS AND ANSWERS :: part3 : 11 to 15

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

11.When the filament of a light bulb is heated slowly, its colour changes from red to orange to yellow and eventually to white. It never appears green or blue. This is because

the maximum temperature attainable gives maximum intensity of emission in the ultraviolet part of the spectrum

the temperature range in which green and blue light predominate is too narrow

the glass bulb cannot transmit green or blue light

any green and blue light emitted is always accompanied by more intense red and orange emission.

12.A Carnot engine takes 300 cal of heat at 500 K and rejects 150 cal of heat to the sink. The temperature of sink is

1000 K

250 K

750 K

125 K

13.Latent heat of vaporization is the energy required to

separate the molecules of the liquid

force back the atmosphere to make space for the vapour

increase the average molecules speed in the liquid phase to that in the gas phase

separate the molecules and to force back the atmosphere

14.Which one of the following thermometers would be most suitable for monitoring the temperatures of gases in a factory chimney if the temperature can very over a range of 200 K in a minute ?

alcohol in glass

mercury in glass

constant-volume gas

thermoelectric

15.A monoatomic ideal gas expands at constant pressure, with heat Q supplied. The fraction of Q which goes as work done by the gas is

2 / 3

3 / 5

2 / 5

More Heat And Thermodynamics QUESTIONS AND ANSWERS available in next pages