Temperature

A new liquid is tested to decide whether it is suitable for use in a liquid-in-glass thermometer.
It is found that the liquid does not expand uniformly with temperature.
What will be the effect of this on the scale of the thermometer?
1. It has a short range.
2. It is not linear.
3. The markings are too close together.
4. The markings are too far apart
Four bars, all exactly the same size, are placed with one end in boiling water.
The time taken for the temperature of the other end to increase by 2 ^oC are measured.

material of bar time for 2 ^oC rise / s
aluminium 10
copper 5
cork 800
foam 1 200

To make a large metal tank with the least heat loss, which materials whould be used for the tank and its insulation?
1. tank: aluminium ; insulation: cork
2. tank: aluminium ; insulation: foam
3. tank: copper ; insulation: cork
4. tank: copper ; insulation: foam
In an unmarked mercury thermometer, the lengths of the mercury thread in melting ice, boiling water and at room temperature are 10 cm, 60 cm and 8 cm respectively.
What is the temperature of the room on the Centigrade scale?
1. 4 ^oC
2. 16 ^oC
3. 13 ^oC
4. - 4 ^oC
The mercury column in a clinical thermometer does not go back into the bulb when it is taken out from the mouth of a patient.

This is because ...........................
1. there is a constriction between the bulb and the stem
2. the thermometer is too short
3. the bulb is too small
4. there is air in the thermometer
On the Kelvin scale, what will be our body temperature of 37 ^oC be?
1. 410 K
2. 236 K
3. 310 K
4. 336 K
Which of the following is not commonly used in the calibration of a thermometer?
1. Resistance of a piece of wire
2. Volume of a fixed mass of solid conductor
3. Pressure of a fixed mass of gas at constant volume
4. Electromotive force of thermocouple
The diagram shows the positions of a mercury thread in a thermometer.

What is the distance between each 1^oC mark on the thermometer?
1. 0.22 cm
2. 0.24 cm
3. 2.0 cm
4. 2.2 cm
When water is heated steadily, its temperature stops rising when the water starts to ..............
1. boil
2. condense
3. evaporate
4. release air bubbles
Why is the straight bore in a clinical thermometer narrow?
1. To give a linear scale.
2. To improve the sensitivity of the thermometer.
3. To increase the thermometer's range.
4. To prevent the mercury returning to the bulb.
What helps a mercury-in-glass thermometer respond quickly to a change in temperature?
1. A large bulb
2. A narrow bore
3. A thin bulb wall
4. A thin stem wall
A clinical thermometer is designed to respond quickly to a change in temperature and to have a high sensitivity.

Which design features should the clinical thermometer have?
1. Bulb: thick glass ; Bore: narrow
2. Bulb: thick glass ; Bore: wide
3. Bulb: thin glass ; Bore: narrow
4. Bulb: thin glass ; Bore: wide
What is special about a mercury-in-glass thermometer that has a high sensitivity?
1. The scale is uniform.
2. The thermometer measures high temperatures.
3. The thermometer measures low temperatures.
4. The thermometer measures small changes in temperature.
The diagram shows a clinical thermometer.

Why does the stem have a very narrow bore?
1. To increase the temperature range measured
2. To improve its sensitivity
3. To prevent mercury returning to the bulb
4. To reduce the amount of mercury used
To enable a mercury-in-glass thermometer to respond quickly to a change in temperature, .................
1. the bore should be narrow
2. the bulb should be large
3. the bulb wall should be thin
4. the stem wall should be thin
The diagram shows a mercury-in-glass laboratory thermometer.

The distance between -10 ^oC and 110 ^oC is 25 cm.
At what temperature will the mercury thread be 15 cm long?
1. 50 ^oC
2. 60 ^oC
3. 62 ^oC
4. 72 ^oC
Why is mercury used in thermometers?
1. It is not poisonous.
2. It has a melting point of 0 ^oC.
3. It is cheap and readily available.
4. It is liquid over a convenient range.
How can liquid-in-glass thermometers be made to respond quickly to changes in temperature?
1. Make the bore narrower.
2. Make the bulb from thinner glass.
3. Make the stem longer.
4. Make the stem from thicker glass.
Four mercury-in-glass thermometers are made with different dimensions.
Which will have the greatest sensitivity?
1. 10 cm long and bore 0.75 mm wide
2. 15 cm long and bore 0.50 mm wide
3. 25 cm long and bore 0.10 mm wide
4. 30 cm long and bore 0.25 mm wide

*material of bar*	*time for 2 ^oC rise / s*
aluminium	10
copper	5
cork	800
foam	1 200

Temperature

Multiple Choice Questions