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Physics -- Heat and Thermodynamics
16.
A spherical black body with a radius of 12 cm radiates 450 W
power at 500 K. If the radius were halved and the temperature
doubled, the power radiated in watts would be
- A.225
- B.450
- C.900
- D.1800
- Answer
- Report
Answer : [D]
17.
A metal rod is shaped into a ring with a small gap. If this is heated,(Choose Multiple answers)
- A.the length of the rod will increase
- B.the gap will decrease
- C.the gap will increase
- D.the diameter of the ring will increase in the same ratio as the length of the rod
- Answer
- Report
Answer : [A,C,D]
18.
A gas may expand either adiabatically or isothermally. A
number of p–V curves are drawn for the two processes over
different ranges of pressure and volume. It will be found that (Choose Mulptiple Answers)
- A.two adiabatic curves do not intersect
- B.two isothermal curves do not intersect
- C.an adiabatic curve and an isothermal curve may intersect
- D.the magnitude of the slope of an adiabatic curve is greater than the magnitude of the slope of an isothermal curve for the same values of pressure and volume
- Answer
- Report
Answer : [A,B,C,D]
19.
A gas expands such that its initial and final temperatures are equal. Also, the process followed by the gas traces a straight line on the p–V diagram.(Choose Multiple Answers)
- A.The temperature of the gas remains constant throughout.
- B.The temperature of the gas first increases and then decreases.
- C.The temperature of the gas first decreases and then increases.
- D.The straight line has a negative slope.
- Answer
- Report
Answer : [B,D]
20.
Two gases have the same initial pressure, volume and
temperature. They expand to the same final volume, one
adiabatically and the other isothermally.(Choose Multiple Answers)
- A.The final temperature is greater for the isothermal process.
- B.The final pressure is greater for the isothermal process.
- C.The work done by the gas is greater for the isothermal process.
- D.All the above options are incorrect.
- Answer
- Report
Answer : [A,B,C]
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