Measurements

Question 1

Systemic error

Answer 1

Causes measurements to have a constant magnitude above or below the true value of the measured quantity

Question 2

Random error

Answer 2

Causes measurements to be varying, have an equal chance of being above or below true value of the measured quantity

Question 3

Accruacy

Answer 3

How closely a measured value agrees with the “true” value

Question 4

Absolute uncertainty

Answer 4

∆x

Question 5

Fractional uncertainty

Answer 5

(∆x)/x

Question 6

Percentage uncertainty

Answer 6

[∆x/x]/100%

Question 7

Fractional uncertainty for z=x^n

Answer 7

Ln(∆x/x)

Question 8

Fractional uncertainty for multiplication and division

Answer 8

(∆z/z) = (∆x/x) + (∆y/y)

Question 9

Precision

Answer 9

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

Question 10

What are the SI base units?

Answer 10

Kilogram

Metre

Second

Kelvin

Ampere

Mole

Candela

Question 11

Derive SI units for force.

Answer 11

kg m s^-2

Question 12

Derive SI units for pressure.

Answer 12

kg m^-1 s^-2