Civil Services Prep

Prelims 2021 · Science and Technology · Question 68

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.

  1. 1 and 2 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3

Answer

1 and 3 only

1. Area of the hole in the lid — Correct. The vent/hole helps regulate how much steam escapes; along with the regulator, it affects the pressure maintained inside, and hence the cooking temperature.

2. Temperature of the flame — Incorrect. A hotter flame mainly increases the rate of heating, but the cooking temperature in a pressure cooker is determined chiefly by the pressure inside once steam pressure is established.

3. Weight of the lid — Correct. In practice, the weighted valve/regulator determines the pressure at which steam is released; higher maintained pressure means higher boiling point and higher cooking temperature.

Therefore, the correct answer is 1 and 3 only.

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