Question

Measurement is the foundation for all experimental science. All the great

technological development could not have been possible without ever-

increasing levels of accuracy of measurements. The measurement of an

amount is based on some international standards which are completely

accurate compared with others. Just like your vegetable vendors,

measurements are taken by comparing an unknown amount of weight with a

known weight. Every measurement carries a level of uncertainty which is

known as an error. This error may arise in the process or due to a mistake in

the experiment. So, 100% accurate measurement is not possible with any

method. The ability of the instrument to measure the accurate value is known

as accuracy. In other words, the closeness of the measured value to a

standard or true value. Accuracy is obtained by taking small readings. The

small reading reduces the error of the calculation. The closeness of two or

more measurements to each other is known as the precision of a substance. If

you weigh a given substance five times and get 3.2 kg each time, then your

measurement is very precise but not necessarily accurate.

1. Which of the following devices is most precise?

a) Vernier caliper

b) Meter scale

c) screw gauge

d) measuring tape

2. Precision is

a) Independent of accuracy

b) Independent of resolution

c) Depends upon accuracy

d) None of the above

3. We Can reduce error in a measurement by

a) Using different equipments for same experiment

b) Using indirect measurement techniques

c) Taking mean values of readings

d) All of the above
4. More precise is more accurate

a) Always

b) Never

c) Maybe

d) None of the above

5. Every measurement contains

a) Some uncertainty

b) Precision depending upon device

c) Some Error

d) All of the above​

Answer 1

Answer:

the physical quantity which is constant during

Answer 2

Answer:

every measure ment contains