Section A Flashcards
State the basic unit and symbol for
Mass
length
kilogram - kg
metre - m
State the basic unit and symbol for
time
current
second - s
ampere- A
State the basic unit and symbol for
temperature
kelvin - K
State the basic unit and symbol for
Amount of substance
Luminous intensity
mole - mol
candela - cd
____ ____ is often referred to as the ‘father of modern scientific methodology’
Galileo Galilei
The variable that is kept constant
control variable
The variable that may be affected by a change in the independent variable
dependent variable
The variable that is altered or investigated
independent variable
Errors
The result of some flaw in the measuring device or the measurement technique
systematic error
An unpredictable error introduced into a measurement when you take a reading
random error
One way in which you can reduce the effect of random errors
The mean of several readings should be taken
Two ways to reduce systematic errors
The value of the error must be discovered and then added or subtracted from each reading
The instrument adjusted
A ____ can be used to measure the internal and external diameter of a cylinder
vernier calliper
A ____ can be used to measure the gauge of a wire
micrometer screw gauge
____ used to measure the height of a table , because it has the necessary range required. In most cases, accuracy to the nearest mm is sufficient
metre rule
____ used for measuring the internal diameter of a water pipe. Its sensitivity, accuracy and range are suitable, as well as its physical design of expanding jaws
vernier calliper
best used for measuring the diameter of an electrical wire because it has the required range, sensitivity and accuracy. It’s jaws also holds the wire firmly
micrometer
suitable for measuring temperatures in the school lab because the experiments generally performed are within its range.
mercury-in-glass
needs to be very sensitive and accurate for the doctor to make adequate decisions regarding the patient. It requires only a small range because the temperature for which it is used are only between 35C and 42C
clinical thermometer
