Question:
In an experiment, a set of readings are obtained as follows:
\[
1.24~\text{mm},\ 1.25~\text{mm},\ 1.23~\text{mm},\ 1.21~\text{mm}.
\]
The expected least count of the instrument used in recording these readings is _______ mm.
In an experiment, a set of readings are obtained as follows:
\[
1.24~\text{mm},\ 1.25~\text{mm},\ 1.23~\text{mm},\ 1.21~\text{mm}.
\]
The expected least count of the instrument used in recording these readings is _______ mm.
Show Hint
The least count of an instrument is usually equal to the smallest decimal place shown in the measurements.
Updated On: Feb 5, 2026
- \(0.01\)
- \(0.1\)
- \(0.05\)
- \(0.001\)
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The Correct Option is A
Solution and Explanation
Concept:
The least count of an instrument is the smallest value it can reliably measure.
It is inferred from the number of decimal places in the recorded readings.
Step 1: Observe the readings All the readings are given correct up to two decimal places: \[ 1.21,\ 1.23,\ 1.24,\ 1.25 \]
Step 2: Infer the least count If readings are recorded up to two decimal places in millimetres, then: \[ \text{Least count}=0.01~\text{mm} \] Final Answer: \[ \boxed{0.01~\text{mm}} \]
Step 1: Observe the readings All the readings are given correct up to two decimal places: \[ 1.21,\ 1.23,\ 1.24,\ 1.25 \]
Step 2: Infer the least count If readings are recorded up to two decimal places in millimetres, then: \[ \text{Least count}=0.01~\text{mm} \] Final Answer: \[ \boxed{0.01~\text{mm}} \]
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