1
NEET 2013 (Karnataka)
+4
-1
Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T1 and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T2. For what values of T the efficiencies of the two engines are equal
A
$${{{T_1} - {T_2}} \over 2}$$
B
$${T_1}{T_2}$$
C
$$\sqrt {{T_1}{T_2}}$$
D
$${{{T_1} + {T_2}} \over 2}$$
2
NEET 2013 (Karnataka)
+4
-1
In a vessel, the gas is at pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be
A
2P
B
P
C
P/2
D
4P
3
NEET 2013
+4
-1
The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T1K to T2K is
A
$${3 \over 4}{N_a}{k_B}\left( {{T_2} - {T_1}} \right)$$
B
$${3 \over 4}{N_a}{k_B}\left( {{{{T_2}} \over {{T_1}}}} \right)$$
C
$${3 \over 8}{N_a}{k_B}\left( {{T_2} - {T_1}} \right)$$
D
$${3 \over 2}{N_a}{k_B}\left( {{T_2} - {T_1}} \right)$$
4
NEET 2013
+4
-1
During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $${{{C_p}} \over {{C_p}}}$$ for the gas is
A
$${5 \over 3}$$
B
$${3 \over 2}$$
C
$${4 \over 3}$$
D
2
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Medical
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