RRB ALP-Heat and Temperature

Stefan's law

✘

Newton's law of cooling

✘

Planck's law

✘ All of these ✔

conduction ✘ convection ✘ radiation ✘ None of these ✔

0.9 ✘ 0.98 ✘ 1 ✘ 0.5 ✔

e1=a1

✘

e1>a1

✘

 e1<a1

✘ there will not be any definite relation between e1 and a1 ✔

any excess of temperature over the surrounding. ✘ small excess of temperature over the surrounding. ✘ large excess of temperature over the surrounding. ✘ very large excess of temperature over the surrounding. ✔

convection losses. ✘ natural convection losses. ✘ forced convection losses. ✘ conduction losses. ✔

move more faster than the cooler object ✘ move more slower than the cooler object ✘ move at the same rate as the cooler object ✘ May move faster it slower than the cooler object. ✔

insulators of heat ✘ conductors of heat ✘ sharers of heat ✘ insulators of electricity ✔

paper ✘ cloth ✘ air ✘ aluminum ✔

change in temperature ✘ Mass of body ✘ Nature of substance ✘ All the above ✔