The least count of an instrument is
inversely proportional to the precision of the instrument
. For example, a sundial may only have scale marks representing the hours of daylight; it would have a least count of one hour. A stopwatch used to time a race might resolve down to a hundredth of a second, its least count.
What is least count give example?
In the simplest manner, we can define the least count of an instrument as the minimum value that we can measure from it. For example, the smallest distance that we can measure from a meter scale is
1mm
, therefore the least count of meter scale is 1mm.
How do you calculate least count?
Least count of a Vernier scale is calculated using the following formula,
Least count = Smallest reading on main scaleNumber of divisions on Vernier scale=1mm10
= This is the least count for Vernier Callipers. Hence, the least count for Vernier Callipers is 0.1mm.
How do you find the least count of a stopwatch?
Furthermore, the least count is the most accurate and smallest value measured by the instrument. The smallest yet the most accurate measure we can make is
0.01 second
in the digital stopwatch. Therefore the least count of a digital stopwatch is 0.01 second.
What is least count of an object?
Least count of a measuring instrument is the smallest measurement that can be made accurately with the given measuring instrument. A metre scale normally has graduations at
1 mm
(or 0.1 cm) spacing, as the smallest division on its scale.
What is least count of vernier scale?
A Vernier scale on a caliper may have a least count of
0.1 mm
while a micrometer may have a least count of 0.01 mm. The least count error occurs with both systematic and random errors. Instruments of higher precision can reduce the least count error.
What is height gauge least count?
The graduated scale has least count of
0.02 mm
like Vernier Caliper has. And the way of taking a reading of measurement in Vernier Height Gauge is same as in Vernier gauge.
What is the least count answer?
Define least count. Answer: The smallest value up to which an instrument can measure is called least count. For example least count of meter rule is up to 1 mm and least count of Vernier caliper is
0.01 cm
.
What is LC of vernier caliper?
The LC of vernier calliper is
the difference between one smallest main scale reading and one smallest vernier
scale reading of 0.1 mm 0r 0.01 cm. … The Least Count measuring instrument is determined mathematically by calculating the main scale reading by the cumulative number of divisions on the main scale.
What is a zero error?
zero error
Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero
, eg the needle on an ammeter failing to return to zero when no current flows. A zero error may result in a systematic uncertainty.
Why do we take 20 oscillations?
Answer: The short answer is
to reduce the uncertainty in your measurement of the period
. … … If the period of the pendulum is about 1 second then 0.2 s uncertainty corresponds to about 20% .
How do you find the least count of a pendulum?
The time of 20 oscillations of a pendulum is measured to be 25 s.
What is the least count of simple pendulum?
The least count of a stop watch is
0.4 second
. The time of 30 oscillations of a pendulum is measured to be 50 seconds. The maximum percentage error in this measurement is found to be 0.
What is least count of steel rule?
- It is a straightedge with equally spaced markings along its length.
- It is used to measure distances or to rule straight lines.
- It is available in different lengths, the common sizes being 150 mm, 300 mm, and 600 mm.
- Its reading accuracy (least count) is 0.5 mm.
What is the least count of protractor?
A simple protractor is a basic device used for measuring angles with a least count of
1° or 1⁄2°
. Bevel Protractor is an angular measuring instrument capable of measuring angles with a least count of 5′. The protractor dial is graduated in degrees with every tenth degree numbered.
What is the least count of 15 cm scale?
2)
1cm
.
