1
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
$${T_1}{T_2}\left( {{P_1}{V_1} + {P_2}{V_2}} \right)/\left( {{P_1}{V_1}{T_1} + {P_2}{V_2}{T_2}} \right)$$
2
AIEEE 2004
+4
-1
Which of the following statements is correct for any thermodynamic system ?
A
The change in entropy can never be zero
B
Internal energy and entropy and state functions
C
The internal energy changes in all processes
D
The work done in an adiabatic process is always zero,
3
AIEEE 2004
+4
-1
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity $$K$$ and $$2K$$ and thickness $$x$$ and $$4x,$$ respectively, are $${T_2}$$ and $${T_1}\left( {{T_2} > {T_1}} \right).$$ The rate of heat transfer through the slab, in a steady state is $$\left( {{{A\left( {{T_2} - {T_1}} \right)K} \over x}} \right)f,$$ with $$f$$ equal to
A
$${2 \over 3}$$
B
$${1 \over 2}$$
C
$$1$$
D
$${1 \over 3}$$
4
AIEEE 2004
+4
-1
Time taken by a $$836$$ $$W$$ heater to heat one litre of water from $$10{}^ \circ C$$ to $$40{}^ \circ C$$ is
A
$$150$$ $$s$$
B
$$100$$ $$s$$
C
$$50$$ $$s$$
D
$$200$$ $$s$$
EXAM MAP
Medical
NEET