Science Summer Test

Question 1

What is the unit of power

Answer 1

The unit of power is the watt (symbol for the watt is W)

Question 2

What is power

Answer 2

Power is a measure of how quickly energy is converted from one form to another

Question 3

An example of power

Answer 3

If a light-bulb has a power has a power rating of 40 watts, then it is converting 40 joules of electrical energy into other types of energy. (Mostly heat with only about 5% to light)

Question 4

What is universal indicator paper

Answer 4

Universal indicator papers are used to show how strong or weak acids and bases are

Question 5

What is the ph scale

Answer 5

The scale shows the ph values from the strongest acid (ph1) to the weakest base (ph14)

Question 6

What do the colours represent on the ph scale

Answer 6

Each colour represents a different ph value on the scale

Question 7

What is neutralisation

Answer 7

The reaction between an acid and a base to produce a salt and water

Question 8

What is a fuel

Answer 8

A fuel is a substance that burns in oxygen to produce heat

Question 9

What are fossil fuels

Answer 9

Fossil fuels are fuels that were formed from the remains of plants and animals that lived millions of years ago

Question 10

Examples of fossil fuels

Answer 10

• peat
• coal
• oil
• gasnatural

Question 11

What do fossil fuels have in common

Answer 11

Hydrocarbon

Question 12

What are Hydrocarbons

Answer 12

Hydrocarbons are compounds that contain hydrogen (H) and carbon (C) only

Question 13

Name a source of hydrocarbons

Answer 13

Fossil fuels

Question 14

What happens when fossil fuels are burned

Answer 14

When fossil fuels are burned they produce carbon dioxide (co2) and water (h2o)

Question 15

What is sulphuric acid

Answer 15

When sulphuric dioxide (so2) dissolves in water it forms sulphuric acid, which is corrosive

Question 16

What is acid rain

Answer 16

Acid rain is rain water with a ph of less then 5.5

Question 17

Where can methane be produced

Answer 17

• coal mines
• slurry pits
• waste dumps
• digestive tracks of animals

Question 18

What is a magnetic force

Answer 18

The attraction and repulsion of magnets

Question 19

What is light

Answer 19

Light is a form of energy

Question 20

Name other forms light is converted into

Answer 20

Light energy is often converted into other forms. E.g. Solar cells, day light timing on devices like watches

Question 21

What way does light travel

Answer 21

Light travels in straight lines

Question 22

Define the unit of power

Answer 22

Power is defined as the rate at which work is done

Question 23

what are genetics

Answer 23

inheritable and non-inheritable characteristics

Question 24

name some examples of inheritable characteristics

Answer 24

arm fold preference
“hitch hicker’s thumb”
pinkie finger alignment
tongue rolling

Question 25

what does DNA stand for?

Answer 25

DNA stands for deoxyribonucleic acid

Question 26

what is DNA

Answer 26

DNA is a molecule built in a particular code

Question 27

what is the DNA code for each separate gene

Answer 27

it's called a gene

Question 28

what is the newton

Answer 28

the newton (symbol N) is the unit of force

Question 29

what is force

Answer 29

a force causes a stationary object to move (push/pull)

Question 30

name some examples of forces

Answer 30

gravity, magnetic, electric, friction

Question 31

what is friction

Answer 31

friction is a force that opposes motion between two objects in contact

Question 32

how can you cause friction

Answer 32

friction can be caused by nuisance by something rubbing against another thing very fast (e.g. when you are riding a bike and you pull the brakes)

Question 33

don't forget!!!!!!!!

Answer 33

weight (in newtons) = mass (in kilograms) x 10

Question 34

give an example of weight into mass

Answer 34

e.g. a student of mass 60 kg has a weight of 600N

Question 35

what is hookes law

Answer 35

the extension of a stretched string is directing proportional to the force that is stretching it

Question 36

what does hookes law mean

Answer 36

hookes law means that if the force of the string doubles so will the extension (length of the spring); if the force then the extension will also triple, etc.

Question 37

What two things does pressure depend on

Answer 37

``` The force (in newtons) The area it is pressing on (in square metres) ```

Question 38

What is the unit of pressure

Answer 38

The unit of pressure is known as pascal (Pa)

Question 39

Name everything in the male reproductive system.

Answer 39

Sperm duct - sperm travels along it Urethra - sperm and urine released through it Testes - produces sperm Penis - for placing sperm into female

Question 40

Name the female reproductive system

Answer 40

Ovary - produces eggs Uterus - where fertilised egg implants Vagina - sperm deposited here Oviduct (egg tube) - egg released into it, site of fertilisation

Question 41

What is reproduction

Answer 41

Reproduction is the production of new members of a species, replacing those who die due to old age, disiese, competition etc.

Question 42

What is sexual reproduction

Answer 42

Sexual reproduction involves two parents who have sex organs which produce sex cells

Question 43

What is asexual reproduction

Answer 43

Asexual reproduction involved one parent and no sex cells