List of top Physics Questions on thermal properties of matter asked in EAMCET

A lead bullet of unknown mass is fired with a speed of 180 ms-1 into a tree in which it stops. Assuming that in this process two-third of heat produced goes into the bullet and one- third into wood. The temperature of the bullet rises by (Specific heat of lead $ =\text{ }0.120\text{ }J{{g}^{-1}}{{C}^{-1}} $ )

A two litre glass flask contains some mercury. It is found that at all temperatures the volume of the air inside the flask remains the same. The volume of the mercury inside the flask is ( $ \alpha $ for glass $ =9\times {{10}^{-6}}/C,\gamma $ for mercury $ =\text{ }1.8\times {{10}^{-4}}/{}^\circ C $ )

A body cools from $ 70{}^\circ C $ to $ 50{}^\circ C $ in 5 min. Temperature of surroundings is $ 20{}^\circ C $ . Its temperature after next 10 min is

Two uniform metal rods of lengths $ {{l}_{1}} $ and $ {{l}_{2}} $ and linear coefficients of expansion $ {{\alpha }_{1}} $ and $ {{\alpha }_{2}} $ respectively are connected to form a single rod of length $ ({{l}_{1}}+{{l}_{2}}). $ When the temperature of the combined rod is raised by t ?C, the length of each rod increases by the same amount. Then $ \left( \frac{{{\alpha }_{2}}}{{{\alpha }_{1}}+{{\alpha }_{2}}} \right) $ is:

At $ 0{}^\circ C $ , the densities of a cork and a liquid, in which the cork floats are $ {{S}_{1}} $ and $ {{S}_{2}} $ respectively. The coefficients of expansion of the material of the cork and the liquid are 100r and respectively. If the cork sinks when temperature of the liquid is t $ {}^\circ C $ , then the $ \left( \frac{{{P}_{2}}}{{{P}_{1}}} \right) $ is: