This set of Physics Multiple Choice Questions & Answers (MCQs) focuses on “Temperature and Heat”.
1. An aluminium piece and a wooden piece have been left in a room for a few hours. When you go and touch them the aluminium seems colder than wood. Select the correct option. Assume room temperature to be 25°.
a) Both have the same temperature greater than 25°
b) Aluminium has a greater temperature than wooden piece
c) Aluminium has a lower temperature than wooden piece
d) Both have the same temperature equal to 25°
Explanation: Both have been left in a room for a few hours, so both will have the same temperature as that of the room. The only reason aluminium feels colder is because it conducts heat away from our body faster than wood.
2. An ice cube is kept on the surface of an aluminium block and another ice cube on the surface of a plastic block. Both blocks have the same temperature. Select the correct statement.
a) Ice will melt faster on the aluminium block
b) Ice will melt faster on the plastic block
c) Ice will melt equally fast on both the blocks
d) Ice will not melt on the plastic block
Explanation: Ice will melt faster on the aluminium block because it has a higher thermal conductivity than plastic and hence conducts heat more rapidly than plastic. Which is why ice melts faster on aluminium.
3. When an object is heated its temperature definitely increases?
Explanation: When we supply heat to a body it’s not necessary for its temperature to increase. The heat may increase temperature, it may expand or change state. For eg: when ice is melting, we provide heat but conversion from ice to water takes place at constant temperature.
Sanfoundry Global Education & Learning Series – Physics – Class 11.
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