Physics · Chapter 6 of 11
Thermo: BPSC & UPPCS Prelims PYQs
17 previous-year questions on Thermo. Each one opens to its answer and explanation.
Assertion (A): Evaporation of sweat from human skin dissipates body heat. Reason (R): High humidity on a hot day increases discomfort.
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- B(A) is true, but (R) is false
- C(A) is false, but (R) is true
- DBoth (A) and (R) are true, but (R) is not the correct explanation of (A)
Heat transfer that does not require a medium is called:
- ARadiation
- BReflection
- CConduction
- DConvection
Compared to a burn due to air at 100°C, the burn due to steam at 100°C is
- ALess dangerous due to high latent heat of evaporation
- BMore dangerous due to high latent heat of evaporation
- CLess dangerous due to low latent heat of evaporation
- DMore dangerous due to low latent heat of evaporation
Assertion (A): Relative humidity decreases with increasing air temperature. Reason (R): Absolute humidity increases with increasing evaporation.
- A(A) is false, but (R) is true
- BBoth (A) and (R) are true and (R) is the correct explanation of (A)
- CBoth (A) and (R) are true, but (R) is not the correct explanation of (A)
- D(A) is true, but (R) is false
A fan produces a feeling of comfort during the hot weather because
- Afan supplies cool air
- Bour body radiates more heat in air
- Cconductivity of air increases
- Dour perspiration evaporates rapidly
- ENone of the above/More than one of the above
Food gets cooked faster in a pressure cooker because
- Awater starts boiling at low temperature due to high pressure
- Bwater starts boiling at high temperature due to high pressure
- Cwater starts boiling at low temperature due to low pressure
- Dwater starts boiling at high temperature due to low pressure
- ENone of the above/More than one of the above
If the doors of a refrigerator are left open for few hours, then the room temperature will
- Adecrease
- Bincrease
- Cremain the same
- Ddecrease only in the area in the vicinity of the refrigerator
- ENone of the above/More than one of the above
In which of the following types of heat engines carburetor is used?
- ABoth diesel and petrol engines
- BSteam engine
- CPetrol engine
- DDiesel engine
The poorest conductor of heat among the following is
- Acopper
- Blead
- Cmercury
- Dzinc
- ENone of the above / More than one of the above
Which of the following is used in a fire alarm?
- APhoto cell
- BWater
- CSolar cell
- DNone of the above
The value of 50 °C in Fahrenheit scale is -
- A104 °F
- B122 °F
- C100 °F
- D75 °F
- ENone of the above / More than one of the above
Which one of the following is associated with 'Albedo'?
- ATransmitting power
- BAbsorbing power
- CEmissive power
- DReflecting power
A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by
- AConduction
- BConvection and radiation
- CBoth (a) and (b)
- DNone of the above
Which one of the following thermometers is known as a pyrometer?
- AThermo-electric thermometers
- BRadiation thermometers
- CGas thermometers
- DLiquid thermometers
Normal temperature of human body is 98.4 °F. Its equivalent temperature in °C is
- A40.16
- B36.89
- C35.72
- D32.36
In an earthen pitcher, the water remains cold due to the process of
- ACondensation
- BEvaporation
- CSublimation
- DNone of the above
Pendulum clocks become slow in summer because
- ADays in summer are large.
- BOf the friction in the coil.
- CThe length of the pendulum increases.
- DThe weight of the pendulum changes.
All 11 chapters of Physics
- Units12 questions
- Motion11 questions
- Gravitation3 questions
- Energy4 questions
- Fluids7 questions
- Thermo17 questions
- Waves16 questions
- Optics26 questions
- Electricity20 questions
- Magnetism9 questions
- Modern Physics19 questions