Introduction/ back to basics

Question 1

What is the repsective unit for Mass?

Answer 1

Dimensional symbol - M
Unit - kilogram (Kg)

Question 2

What is the repsective unit for Length?

Answer 2

DImensional symbol - L
Unit - metre (m)

Question 3

What is the repsective unit for Time?

Answer 3

Dimensional symbol - S
Unit- Second (s)

Question 4

What is the repsective unit for force?

Answer 4

Dimensional symbol - F
Unit - Newton (N = m kg s-2)

Question 5

How is force calculated?

Answer 5

Mass (m) x acceleration (a)

Question 6

How many places will prefixes move the decimal point?

Answer 6

3 places

Apart from - deca, hecto, centi and deci

Question 7

Is the symbol ever written as plural i.e., seconds?

Answer 7

NO

Question 8

Are symbols lower case or upper case?

Answer 8

Lower case unless named after individual or larger than prefix of kilo (k)

Question 9

How are units that are multiples of each shown?

Answer 9

Seperated by a space
m s = metres a second
ms = milliseconds

Question 10

What does the expotent of unit with a prefix refer to?

Answer 10

Unit and prefix
KN2 = (KN)2 = KN x KN

Question 11

How should physical constant and numbers with several digits on either side of the decimal point be written?

Answer 11

with a space between every 3 digits
95 959.599 995

Question 12

How should numbers used in calculations interms of based or derived be expressed?

Answer 12

In terms of powers of 10 with expression as a final prefix

Question 13

What is the exponentional of tera?

Answer 13

10*12

Question 14

What is the exponentional of giga?

Answer 14

10*9

Question 15

What is the exponentional of mega?

Answer 15

10*6

Question 16

What is the exponentional of kilo?

Answer 16

10*3

Question 17

What is the exponentional of deca?

Answer 17

10*1

Question 18

What is the exponentional of deci, centi, milli, micro, nano and pico?

Answer 18

deci - 10-1
centi - 10-2
milli - 10-3
micro - 10-6
nano - 10-9
pico - 10-12

Question 19

How are plane angular measuremenst expressed?

Answer 19

Radian (rad)
180* = pie rad

Question 20

How should you convert units from smaller to larger and vice versa?

Answer 20

Going smaller multiply (m to cm multiply by 100)
Going larger (divide by conversion factor cm to m divide by 100)

Question 21

What are natural number?

Answer 21

Counting number 1 2 3 4

Question 22

WHat are integers?

Answer 22

positive and negative whole number
-5 -4 -3
5 4 3

Question 23

What are rationals?

Answer 23

numbers that can be expressed as a ratio of 2 integers but can also be written as terminating or recurring decimals

Question 24

What are some examples of rationals?

Answer 24

2/5= 0.4

Question 25

What are irrationals?

Answer 25

numbers which cannot be expressed as either the ratio of 2 integers or recurring decimal

Question 26

What is an example of an irrational?

Answer 26

square root 2 = 1.1442...

Question 27

what is a + b?

Answer 27

sum of

Question 28

what is a - b ?

Answer 28

difference between

Question 29

What happens with a + a?

Answer 29

= 2a

Question 30

What happens with a x a and a x a x a?

Answer 30

a*2 a*3

Question 31

What happens with a x b?

Answer 31

ab (product of a and b)

Question 32

What happens with -1 x a?

Answer 32

-a

Question 33

What happens with 1/a?

Answer 33

a*-1 (reciprocal)

Question 34

What are the numerator and denominator?

Answer 34

Num = top Den = bottom

Question 35

What is an example of cancelling a fraction to its simplest form?

Answer 35

2/6 = 1/3

Question 36

What is needed to add/ subtract fractions?

Answer 36

denominator must be the same so must find the lowest common denomiator

Question 37

What do you do if the denominator is different for adding?

Answer 37

7/16 = 3/8 double 3/8 =6/16

Question 38

How do you multiply fractions?

Answer 38

Multiply numerators to give new numerator Multiply denominators to give a new denominator 1/5 x 3/4 = 3/20

Question 39

How do you divide a fraction?

Answer 39

flip the second fraction and multiply 1/2 / 3/4 = 1/2 x 4/3 =4/6