In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
- 1.Area of the hole in the lid
- 2.Temperature of the flame
- 3.Weight of the lid
Select the correct answer using the code given below.
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Answer: C. Food cooks at the boiling point of the water inside, and that depends on the pressure inside. The pressure is set by the weight (the whistle) sitting on the vent and the area of the vent hole: pressure equals weight divided by area. A hotter flame only makes the cooker reach that pressure sooner. So 1 and 3.
Watch for: A hotter flame feels like it should cook hotter, but it only reaches the set pressure sooner.
Why the other options are wrong
- A. Wrong because flame temperature does not set the cooking temperature.
- B. Wrong because flame temperature does not set the cooking temperature.
- D. Wrong because flame temperature does not set the cooking temperature.
Source to check: NCERT Class 11 Physics Part 2, Chapter 11 Thermal Properties of Matter (boiling point and pressure)
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.