CIE Physics Paper-1: Specimen Questions 20 - 21 of 109
Question number: 20
Find most stable arrangement to hold a flask of liquid.
In all others choices, the flask is keeping at some height. Thus they are not so stable.
Question number: 21
Find average speed of molecules in 2 boxes if they are filled with air and one is on heater and the other is on bench.
Box X – Zero, Box Y – Fast
Box X – Fast, Box Y – Zero
Box X – Slow, Box Y – Fast
Box X – Fast, Box Y – Slow
Here box X is on heater and the box Y is on bench.
Then molecule in box x is moving faster than box Y because of heat. And so molecule in box Y is moving slowly.