Tag: physics
Questions Related to physics
A heat engine takes steam at $200^oC$ and after doing work exhausts it directly into air at $100^oC$. Calculate the percentage of heat which is wasted.
Which of the following material is most suitable for cooking utensil ?
Two angular blocks A and B different metal have same length and same area of cross-section . they are kept in such a way that their cross-sectional area touch each other. the temperature at one end of A is $ 100^0 $ C and that of B at the other end is $0^0 C $ C . if the ratio of their conductivity is 1:3 then under steady state, the temperature of the junction in contact will be:-
On heating one end of a rod, the temperature of the whole rod will be uniform when the :
A slab consists of two parallel layers of two difference materials of same thickness and having thermal conductivities $K _1$ and $K _2$. The equivalent thermal conductivity K of the slab is-
Which of the following represent practical uses each of good conductors of heat?
On a cold morning, a metal surface in touching is felt colder than a wooden surface, because the metal has:
On a cold morning, a metal surface will feel colder to touch than a wooden surface, because:
Statement-1
On a chilly day, the metallic cap of a pen feels much colder than the plastic body although both are at the same (room) temperature.
Statement-2
Metal has a higher coefficient of thermal conductivity than plastic.
Metals are good conductors of heat because.