Measurement

Question 1

What is a systematic error?

Answer 1

A systematic error is one that occurs according to some fixed rule or pattern such that they yield a consistent over-estimation or under-estimation of the true value of the measured quantity.

Question 2

What is a random error?

Answer 2

A random error is one that occurs without a fixed pattern such that a set of measurements done under the same conditions have an equally likely chance of being greater or smaller than the true value.

Question 3

What does Accuracy refers to?

Answer 3

It refers to how closely a measured value agrees with the “true” value. It is a measure of correctness.

Question 4

What does precision refers to?

Answer 4

It refers to how closely individual measurements agree with each other without reference to any “true” value. It is a measure of reproducibility.

Question 5

Estimation of power of electric kettle.

Answer 5

2000W

Question 6

Estimation of the radius of nucleus.

Answer 6

10E-15

Question 7

Estimation of power of a filament bulb.

Answer 7

60W

Question 8

Estimation of current in the filament of a bulb.

Answer 8

0.3A

Question 9

Estimation of the resistance of the filament.

Answer 9

700 Ohms

Question 10

Estimation of the separation between two atoms in solid.

Answer 10

10E-19