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Q. No.Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this?
| 1. | the coefficient of thermal expansion is large. |
| 2. | it is shiny. |
| 3. | it is a liquid at room temperature. |
| 4. | it has a high density. |
Subtopic: Â Temperature and Heat |
From NCERT
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A heater supplying constant power \(P\) watts is switched on at time \(t=0\) minutes to raise the temperature of a liquid kept in a calorimeter of negligible heat capacity. A student records the temperature of the liquid \(T(t)\) at equal time intervals. A graph is plotted with \(T(t)\) on the \(y\)-axis versus \(t\) on the \(x\)-axis. Assume that there is no heat loss to the surroundings during heating. Then:
| 1. | The graph is a straight line parallel to the time axis. |
| 2. | The heat capacity of the liquid is inversely proportional to the slope of the graph. |
| 3. | If some heat were lost at a constant rate to the surroundings during heating, the graph would be a straight line but with a larger slope. |
| 4. | The internal energy of the liquid increases quadratically with time. |
Subtopic: Â Temperature and Heat |
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From NCERT
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