Measurement

Question 1

What are the seven base SI quantities?

Answer 1

Mass, Time, Length, Electric Current, Temperature, Amount of substance and Luminous Intensity

Question 2

What are the prefixes and symbols for 10^-1, 10^-2, 10^-3, 10^-6, 10^-9, 10^-12,

Answer 2

deci (d), centi (c), milli (m), micro (µ), nano (n), pico (p)

Question 3

What is a systematic error?

Answer 3

A systematic error is an error that occurs due to some fixed rule or pattern such that they yield a general overestimation or underestimation of the true value of the measured quanitity.

Question 4

What is a random error?

Answer 4

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

Question 5

What is accuracy?

Answer 5

Accuracy refers to how closely a measured quantitiy agrees with a ‘true’ value

Question 6

What is precision?

Answer 6

Precision refers to how closely individual measurements agree with each other without reference to any ‘true’ value.

Question 7

What are scalar quantities?

Answer 7

Scalar quantities are quanitities with magnitude only

Question 8

What are vector quantities?

Answer 8

A vector is a quanitity which has both magnitude and direction