PC3 Revision

Question 1

What are the differences between light and sound?

Answer 1

Light is a transverse wave and sound is a longitudinal wave. Light travels at 300,000,00m/s and sound travels at 330m/s

Question 2

What is reflection ?

Answer 2

When light bounces off a surface back to the medium it came from

Question 3

Why does refraction occur?

Answer 3

The speed of light Changes as it moves from one medium to another

Question 4

What are the primary colours of light

Answer 4

Blue, Green and Red

Question 5

DESCRIBE THE STRUCTURE OF THE EYE- NOTEBOOK

Question 6

DESCRIBE THE STRUCTURE OF THE EAR- NOTEBOOK

Question 7

What is ultrasound.?

Answer 7

ultrasounds use sound waves to make pictures of the body.

Question 8

State a property of a solid

Answer 8

Any answers from the following:

It cannot be compressed
It cannot change shape easily
It cannot flow
It has a fixed volume

Question 9

State a property of a liquid

Answer 9

Any answer from the following:
It cannot be compressed
It can change shape easily
It can flow
It has a fixed volume

Question 10

State of property of a gas

Answer 10

Any answer from the following:
It can be compressed easily
It can easily change shape
It can flow
It will spread out in a container to fill all available space
It has a volume that can change

Question 11

Stay at the four changes of state

Answer 11

Melting
Evaporating
Condensing
Freezing

Question 12

In which state do the particles have the highest density?

Answer 12

Solid

Question 13

What is the definition of diffusion?

Answer 13

Diffusion is the movement of gas particles or particles in a solution from a high concentration to a lower concentration

Question 14

What is Brownian motion?

Answer 14

The random movement displayed by small particles that are suspended in fluids

Question 15

What causes gas pressure?

Answer 15

Gas pressure is caused by particles colliding with the walls of the container 

Question 16

What is a cell

Answer 16

The smallest unit that can live on its own, and that makes up all living organisms

Question 17

What is a tissue?

Answer 17

A group of cells that are similar and work together to perform a certain function

Question 18

What is an organ?

Answer 18

Many different tissues working together

Question 19

Describe the skeletal system

Answer 19

The organ system that supports the body, gives it shape, protects internal organs , allows movement and produces broad blood cells

Question 20

Describe the muscular system

Answer 20

An organ system consisting of skeletal smooth, cardiac muscle. It permit movement of the body.

Question 21

Name the parts of the respiratory system

Answer 21

Nose/mouth, trachea., bronchi, lungs, bronchioles, alveoli

Question 22

Explain how gas exchange occurs

Answer 22

Oxygen moves from the lungs to the bloodstream at the same time carbon dioxide passes from the blood to the lungs

Question 23

What is a drug?

Answer 23

Chemical substance that has an effect on the body

Question 24

What is asthma?

Answer 24

A disease in which the bronchial airways in the lungs become narrowed and swollen, making it difficult to breathe

Question 25

What are the harmful effects of smoking?

Answer 25

Smoking can cause lung diseases by damaging your airways, and the alveoli are found in your lungs

Question 26

What is the difference between mass and weight?

Answer 26

Maths is the amount of matter in an object and weight is the force of gravity acting on a mass

Question 27

What is an orbit?

Answer 27

The curved path of one object around another 

Question 28

List the planets in the Solar System in order.

Answer 28

Mercury, Venus Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Question 29

What causes days and nights

Answer 29

The Earth rotates once every 24 hours on its axis

Question 30

Why do we experience seasons?

Answer 30

The earths axis is tilted as it travels around the Sun some parts receive more sunlight each day than others

Question 31

What is an eclipse?

Answer 31

Eclipses caused when an object in space, obscures the light from another object in space

Question 32

What is the difference between an acid and an alkali

Answer 32

An acid will turn red, orange, yellow and have a ph level less than 7 and an alkali will turn blue, purple and have a ph level of greater than 7

Question 33

What is an indicator

Answer 33

A substance that will change colour specific pH value

Question 34

What is neutralisation?

Answer 34

The process of removing acidity or alkalinity by reacting an acid and an alkali together

Question 35

What gas is made when a metal reacts with an acid?

Answer 35

Hydrogen

Question 36

What are the contents of a healthy human diet?

Answer 36

Carbohydrates
Lipids
Proteins
Vitamins
Minerals
Fibre
Water

Question 37

What is malnutrition?

Answer 37

Lacking in a specific nutrient

Question 38

How do we test for starch?

Answer 38

Add two drops of iodine to the sample if starch is present, it will turn black/blue

Question 39

Name in order that organs that food passes through

Answer 39

Mouth, oesophagus, stomach, small intestine, large intestine, rectum and anus

Question 40

What do enzymes do?

Answer 40

Enzymes help speed up the chemical reactions in our body

Question 41

What happens in the intestines?

Answer 41

In the small intestine digested food is absorbed into the blood.

The large intestine absorbs water and changes the waste from liquid into stool

Question 42

How many loops does a series circuit contain?

Answer 42

One

Question 43

How many loops does a parallel circuit contain?

Answer 43

More than one

Question 44

What does resistance do?

Answer 44

Slows down current in a circuit

Question 45

What is resistance measured in?

Answer 45

Ohms

Question 46

What is ohms law?

Answer 46

Voltage= Current x Resistance