Section A

Question 1

State the basic unit and symbol for

Mass
length

Answer 1

kilogram - kg

metre - m

Question 2

State the basic unit and symbol for

time
current

Answer 2

second - s

ampere- A

Question 3

State the basic unit and symbol for

temperature

Answer 3

kelvin - K

Question 4

State the basic unit and symbol for

Amount of substance

Luminous intensity

Answer 4

mole - mol

candela - cd

Question 5

____ ____ is often referred to as the ‘father of modern scientific methodology’

Answer 5

Galileo Galilei

Question 6

The variable that is kept constant

Answer 6

control variable

Question 7

The variable that may be affected by a change in the independent variable

Answer 7

dependent variable

Question 8

The variable that is altered or investigated

Answer 8

independent variable

Question 9

Errors

The result of some flaw in the measuring device or the measurement technique

Answer 9

systematic error

Question 10

An unpredictable error introduced into a measurement when you take a reading

Answer 10

random error

Question 11

One way in which you can reduce the effect of random errors

Answer 11

The mean of several readings should be taken

Question 12

Two ways to reduce systematic errors

Answer 12

The value of the error must be discovered and then added or subtracted from each reading

The instrument adjusted

Question 13

A ____ can be used to measure the internal and external diameter of a cylinder

Answer 13

vernier calliper

Question 14

A ____ can be used to measure the gauge of a wire

Answer 14

micrometer screw gauge

Question 15

____ 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

Answer 15

metre rule

Question 16

____ 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

Answer 16

vernier calliper

Question 17

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

Answer 17

micrometer

Question 18

suitable for measuring temperatures in the school lab because the experiments generally performed are within its range.

Answer 18

mercury-in-glass

Question 19

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

Answer 19

clinical thermometer