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.

The cooking temperature in a pressure cooker is determined by the internal pressure, which is governed by the equilibrium between the steam pressure and the downward force exerted by the weight over the area of the lid's hole ($Pressure = Force/Area$). While the flame temperature affects the rate at which the cooker reaches its operating pressure, it does not influence the maximum temperature achieved, as any excess heat simply causes more steam to escape through the valve once the pressure limit is reached. This question tests the core concept that the boiling point of a liquid increases with increasing external pressure.