CBSE
At 27°C, a motor car tyre has a pressure of 2 atmospheres. The temperature at which the tyre suddenly burst will be : (Given: γair = 1.4)
246.1 K
250 K
246 K
248 K
In an isochoric process:
ΔV = 0
Δw = 0
Δa = 0
ΔT = 0
The figure shows a P-V diagram. How does the work done in the process change with time?
First decreases and then increases
First increases and then decreases
Continuously decreases
Continuously increases
Two gases A and B at same pressure contain a number of moles n1 and n2. Their volume temperature graphs are shown in the figure. Then the ratio n1/n2
1
1/2
1/3
3
A Carnot engine takes heat from a reservoir at 627° C and rejects heat to a sink at 27° C. Its efficiency will be
3/5
1/3
2/3
200/209
The velocity of sound in air at NTP is 330 m/s. What will be its value when the temperature is doubled and pressure is halved?
330 m/s
165 m/s
330 m/s
Which of the following parameters does not characterize the thermodynamic state of matter?
Volume
Temperature
Pressure
Work
An ideal gas is taken through the cycle A ➔ B ➔ C ➔ A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5J, the work done by the gas in the process. C ➔ A is :
-5 J
-10 J
-15 J
-20 J
Anatomy and Bismuth are usually used in thermocouple, because
a constant e..m.f is produced
higher thermo e.m.f is produced
a negative e.m.f is produced
lower thermo e.m.f is produced
A Carnot's engine operates with source at 127°C and sink at 27°C. If the source supplies· 40 kJ of heat energy, the work done by the engine is
30 kJ
10 kJ
4 kJ
1 kJ