SAMPLE QUESTIONS
1. In similar calorimeters, equal volumes of water and alcohols , when poured , take 100 and 74s, respectively, to cool from 50
^{0}C to 40
^{0}C. If the thermal capacity of each calorimeter is numericall equal to volume of either liquid, the calculate the speciifc heat capacity of alcohol (given : the relative density of alcohol as 0.8 and specific heat capacity of water as 1 cal/g/
^{0}C).
a) 0.8 cal/g
^{0}C
b) 0.6 cal/g
^{0}C
c) 0.9 cal/g
^{0}C
d) 1 cal/g
^{0}C
2. Three rods of same dimensions are arranged as shown in Fig. They have thermal conductivities K
_{1}, K
_{2} and K
_{3}. The point P and Q are maintained at different temperatures for the heat to flow at the same rate along PRQ and PQ. Which of the following options is correct?
a) $K_{3}$ = $\frac{1}{2}\left (K_{1} + K_{2} \right )$
b) $K_{3}$ = $K_{1} + K_{2}$
c) $K_{3}$ = $\frac{k_{1}K_{2}}{K_{1} + K_{2}}$
d) $K_{3}$ = $2\left (K_{1} + K_{2} \right )$