CIE Physics Paper-1: Specimen Questions 29 - 30 of 109
Question number: 29
Why a person takes time to feel hot if he fills glass beaker with hot water?
Glass is a poor conductor of heat.
Water is a good conductor of heat.
Water is a poor conductor of heat.
Glass is a good conductor of heat.
Conductor means is allowed to flow something. We can also say that it allowed to passing something from heat. The water is good conductor of heat but in above case takes several seconds before his hand starts to feel the heat. Because glass is poor conductor of heat, so it takes time to passing the heat of water to his hand.
Question number: 30
Consider sound travels at 340m/s. Find time between shouting of the boy at cliff 500 m away and hearing back his echo.
Distance between boy and cliff is 500 m, and he shouted for help but its voice back as echo. So distance travel by voice is 2 ⨯ 500
And the sound travels with speed 340 m/s