Advertisements
Advertisements
प्रश्न
The mean diameter of a thin brass rod is to be measured by vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only?
Advertisements
उत्तर
- Due to random errors, a large number of observations (say, 100) will give a more reliable result than a smaller number of observations (say, 5).
- This is due to the fact that the probability (chance) of making a positive random error of a given magnitude is equal to that of making a negative random error of the same magnitude.
- Thus, in a large number of observations, positive and negative errors are likely to cancel each other. Hence, a more reliable result can be obtained.
APPEARS IN
संबंधित प्रश्न
How many significant figures are present in the 208?
Round up the following upto three significant figures:
34.216
Round up the following upto three significant figures:
0.04597
Round up the following upto three significant figures:
2808
The relative density of lead is 11.3. Its density is ______ g cm–3or ______ kg m–3.
It is a well known fact that during a total solar eclipse the disk of the moon almost completely covers the disk of the Sun. From this fact and from the information you can gather from examples 2.3 and 2.4, determine the approximate diameter of the moon.
State the number of significant figures in the following:
0.007 m2
State the number of significant figures in the following:
2.64 × 1024 kg
State the number of significant figures in the following:
0.2370 g cm–3
State the number of significant figures in the following:
0.0006032 m2
Describe what is meant by significant figures.
Which of the following has the highest number of significant figures?
Taking into account of the significant figures, what is the value of 9.99 m – 0.0099 m?
If the density of a solution is 3.12 g mL–1, the mass of 1.5 mL solution in significant figures is ______.
The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is ______.
The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is ______.
Why do we have different units for the same physical quantity?
Significant figures in a measurement include which of the following?
Which of the following measurements contains exactly two significant figures?
