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Q.

What is the least count of a laboratory thermometer?


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a

1 ℃ or 0.5 ℃

b

2 ℃ or 0.5 ℃

c

3 ℃ or 0.5 ℃

d

All of the above  

answer is A.

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Detailed Solution

The least count of a laboratory thermometer is 1 ℃ or 0.5 ℃.
The least count of a measuring device is the least value of a physical quantity that can be measured accurately using the instrument. Generally, thermometers having the least count of 1 ℃ or 0.5 ℃ are used in the laboratory.     
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What is the least count of a laboratory thermometer?