1
AIEEE 2005
+4
-1
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is
A
$${1 \over 4}$$
B
$${1 \over 2}$$
C
$${2 \over 3}$$
D
$${1 \over 3}$$
2
AIEEE 2004
+4
-1
If the temperature of the sun were to increase from $$T$$ to $$2T$$ and its radius from $$R$$ to $$2R$$, then the ratio of the radiant energy received on earth to what it was previously will be
A
$$32$$
B
$$16$$
C
$$4$$
D
$$64$$
3
AIEEE 2004
+4
-1
One mole of ideal monatomic gas $$\left( {\gamma = 5/3} \right)$$ is mixed with one mole of diatomic gas $$\left( {\gamma = 7/5} \right)$$. What is $$\gamma$$ for the mixture? $$\gamma$$ Denotes the ratio of specific heat at constant pressure, to that at constant volume
A
$$35/23$$
B
$$23/15$$
C
$$3/2$$
D
$$4/3$$
4
AIEEE 2004
+4
-1
Two thermally insulated vessels $$1$$ and $$2$$ are filled with air at temperatures $$\left( {{T_1},{T_2}} \right),$$ volume $$\left( {{V_1},{V_2}} \right)$$ and pressure $$\left( {{P_1},{P_2}} \right)$$ respectively. If the value joining the two vessels is opened, the temperature inside the vessel at equilibrium will be
A
$${T_1}{T_2}\left( {{P_1}{V_1} + {P_2}{V_2}} \right)/\left( {{P_1}{V_1}{T_2} + {P_2}{V_2}{T_1}} \right)$$
B
$$\left( {{T_1} + {T_2}} \right)/2$$
C
$${{T_1} + {T_2}}$$
D
$${T_1}{T_2}\left( {{P_1}{V_1} + {P_2}{V_2}} \right)/\left( {{P_1}{V_1}{T_1} + {P_2}{V_2}{T_2}} \right)$$
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