January Exam

Question 1

What is the first stage of drinking water?

Answer 1

Preliminary

Question 2

What is the second stage of drinking water?

Answer 2

Sedimentation

Question 3

What is the third stage of drinking water?

Answer 3

Aerobic digestion

Question 4

What is the fourth stage of drinking water?

Answer 4

Anaerobic digestion

Question 5

What happens in the first stage of drinking water?

Answer 5

Screening is done to remove large bits like bags, twigs and grit from the sewage

Question 6

What happens in the third stage of drinking water?

REMOVED

Answer 6

Effluent is removed and mixed with bacteria in the presence of lots of oxygen, the bacteria aerobically digest organic matter in the effluent including other microbes.

Question 6

What happens in the second stage of drinking water?

Answer 6

During sedimentation heavier sewage sinks know as sludge, lighter sewage floats known as effluent

Question 6

What happens in the fourth stage of drinking water?

broken down

Answer 6

Sludge is broken down by bacteria in a different process called anaerobic digestion

Question 6

What does anaerobic digestion produce?

Answer 6

Lots of methane gas which can be used as an energy source to power the plant or neighbouring homes.

Question 6

What is ozone disinfection?

Answer 6

involves pumping an electrical current through the water that causes oxygen molecules to disassociate and combine with a free oxygen molecule forming O3(also known as ozone)

Question 7

What happens on UV disinfection?

Answer 7

the bacteria in the water aren’t killed rather there sterilised making them harmless.

Question 8

How does chlorine disinfect water?

Answer 8

Through chemical disinfection. It is added to the effluent to kill off any bacteria and organisms still living in the water. It is then removed before it can be discharged as to not kill off anything in the discharge location

Question 9

How long does the process of waste water treatment take?

Answer 9

Average 24 - 36 hours

Question 10

Where is the effluent released?

Answer 10

Stream or lake or other water source.
Discharged into another treatment plant directly.

Question 11

What are bar screens?

Answer 11

large vertical bars that stand at the inlet of nearly every waste water treatment plant

Question 12

What are grit chambers?

sift

Answer 12

As the sewage flows into the grit chamber the velocity of the sewage is adjusted to allow for particles of sand and rock to settle out.

Question 13

What are the three grit chambers?

Answer 13

Horizontal grit chambers
Aerated grit chambers
Vortex grit chambers

Question 14

What is settling velocity?

Answer 14

speed at which a particle settles

Question 15

What is scalar?

Answer 15

Quantities have magnitude only

Question 16

What is vector?

Answer 16

Quantities have magnitude and an associated direction

Question 17

What is speed?

Answer 17

How fast an object is travelling

Question 18

What is velocity?

Answer 18

Speed with direction

Question 19

What is acceleration?

Answer 19

The rate of change of velocity

Question 20

Distance

Answer 20

Scalar

Question 21

Displacement

Answer 21

Vector

Question 22

Speed

Answer 22

Scalar

Question 23

Velocity

Answer 23

vecor

Question 24

Acceleration

Answer 24

Vector

Question 25

What is displacement

Answer 25

Shortest point between the two points

Question 26

What is the SI unit of force?

Answer 26

Newton

Question 27

What is the unit for mass?

Answer 27

kg

Question 28

What is the unit for acceleration?

Answer 28

m/s 2

Question 29

What is mass?

Answer 29

How much of you there is

Question 30

What is weight?

Answer 30

Is a FORCE of gravity. It is how strongly gravity pulls an object towards Earth

Question 31

What is the centre of mass?

Answer 31

Is where gravity affects you from

Question 32

How do you calculate weight?

Answer 32

Mass x Gravitational Field Strength

Question 33

What are bar screens designed to do?

Answer 33

designed to stop larger items from getting to the plant inverting machinery like pumps

Question 34

What happens in Interphase?

Answer 34

cell organelles reproduce DNA replicated basic cell metabolism increases Nuclear membrane breaks down

Question 35

What is the purpose of mitosis?

Answer 35

Growth Repair reproduce

Question 36

How to calculate micrometres to Nano meters?

Answer 36

x 1000

Question 37

How to calculate Nano meters to micrometres?

Answer 37

/ 1000

Question 38

How to calculate micrometres to milometers?

Answer 38

/ 1000

Question 39

How to calculate milometers to micrometres?

Answer 39

x 1000

Question 40

How to calculate milometers to centimetres?

Answer 40

/ 10

Question 41

How to calculate centimetres to milometers?

Answer 41

x 10

Question 42

How to calculate metres to milometers?

Answer 42

x 1000

Question 43

How to calculate milometers to metres?

Answer 43

/ 1000

Question 44

What does homozygous mean?

Answer 44

having two identical alleles of a particular gene or genes

Question 45

What does heterozygous mean?

Answer 45

having two different alleles of a particular gene or genes.

Question 46

what is genotype?

Answer 46

combination of alleles

Question 47

What is distillation

Answer 47

separates a soluble and a non soluble substance with evaporation

Question 48

What is scalar?

Answer 48

size or magnitude ONLY

Question 49

What is vector?

Answer 49

direction and size

Question 50

Displaysment

Answer 50

Vector

Question 51

Speed

Answer 51

scalar

Question 52

upthrust

Answer 52

vector

Question 53

weight

Answer 53

vector

Question 54

mass

Answer 54

scalar

Question 55

time

Answer 55

scalar

Question 56

forces

Answer 56

vector

Question 57

acceleration

Answer 57

vector

Question 58

temperature

Answer 58

scalar

Question 59

what is a genotype?

Answer 59

the coding for your characteristics

Question 60

What is the table for dominant and recessive?

Answer 60

Punet square