Skills

Question 1

Name 7 S.I base units and their symbols?

Answer 1

length- m
mass - kg
time- s
electric current- A
temperature- K
amount of substance - mol
luminous intensity- cd

Question 2

Rule of rounding off in calculations?

Answer 2

never round off until end

Question 3

Name all scientific notation figures?

Answer 3

giga	10 9	        G
mega 106	M
kilo	103  	k
deci	10-1	        d
centi 10-2	c
milli 10-3	        m
micro 10-6	mu
nano 10-9	n
pico	10-12	p

Question 4

How to find d and e?

Answer 4

d- how many places decimal must go to make number between 0 and 10

e- how many places after decimal comma

Question 5

if e is bigger or smaller than 0?

Answer 5

bigger- move to right

smaller - move to left

Question 6

What are significant figures?

Answer 6

non zero numbers

• besides zeros in between non zero
• only 0 if non zero number at end of decimal part

Question 7

from km.h -1 to m.s -1?

Answer 7

/3.6

Question 8

celcius to Kelvin?

Answer 8

+273

Question 9

what is rate

Answer 9

change per time unit

Question 10

directly proportional? (4)

Answer 10

• Increase in one variable leads to increase in other variable with same factor
• straight line graph through origin
• y=kx
• straight line not thru origin- linear relationship- variable increase/ decrease together

Question 11

inversely proportional? (2)

Answer 11

• Value change leads to opposite change in other value

- Curve never cuts thru axis

Question 12

Accuracy VS precision

Answer 12

aCcurate is how Close to real value

pRecision is Repeatable (consistent)

Question 13

Variables?

Answer 13

Independent- manipulated by investigator
dependent- Measurable results of independent variable changing
Fixed- Variables kept constant