Physic

Question 1

What factors affect thinking dist

Answer 1

if the driver is tired, distracted by a mobile phone or under the influence of drugs or alcohol

Question 2

What factors affect braking dist

Answer 2

mass of the car, worn tyres or wet weather conditions.

Question 3

How can you identify if a spring obey hookes law with a graph

Answer 3

If the line is linear the spring obeys hookes law but when it curves it means the spring has exceeded its elastic limit

Question 4

What features are present in a domestic appliance to prevent user from getting a shock

Answer 4

Double insulation
Earthing
Fuses
Circuit breakers

Question 5

How does earthing stop user to get shock

Answer 5

you would receive an electric shock if the live wire becomes loose and touches the metal casing. An earth wire is connected to the metal case and provides a path of very low resistance for the electricity to pass through. The surge of electricity through the earth wire causes the fuse to break.

Question 6

What is current

Answer 6

Current is the rate of flow of electric charge (i.e. how many electrons are flowing through the wire in a certain amount of time). It is measured in Amps using an ammeter.

Question 7

What is voltage

Answer 7

Voltage (also referred to as potential difference) is a measure of how much energy is transferred between two points in a circuit. It is measured in Volts using a voltmeter.

Question 8

What is power

Answer 8

Power is the rate at which electrical energy is converted into other forms. For example, a washing machine with high power will convert electrical energy into kinetic energy much faster than one with low power. Power is measured in Watts.

Question 9

What is DC and what is AC

Answer 9

Direct current means that the electrons are flowing through a wire in one direction only whereas in alternating current, the electrons are constantly changing direction.

Question 10

In a series circuit what is shared voltage or current

Answer 10

Voltage

Question 11

In a parallal circuit what is shared voltage or current

Answer 11

current

Question 12

What is resistance

Answer 12

Resistance is anything which slows the current down. If you add more components to a circuit (in series), there will be a higher resistance. Resistance is measured in Ohms.

Question 13

What is a conductor

Answer 13

Any material which allows electricity to pass through it is called a conductor.

Question 14

What is a insulator

Answer 14

Materials which do not allow electricity to pass through easily are referred to as insulators

Question 15

What is a transverse wave

Answer 15

vibration are perpindicular to the direction of wave travel

Question 16

What is longitudinal wave

Answer 16

vibration are parallel to the direction of wave travel

Question 17

Examples of longitudinal waves

Answer 17

sound

Question 18

Example of transverse

Answer 18

electromagnetic spectrum
light

Question 19

What is the doppler effect

Answer 19

The Doppler Effect occurs when a wave is emitted from a moving source. It appears as if the frequency of the wave changes as the source moves past you

Question 20

When a source is moving to a person
state the size of frequency and wavelength

Answer 20

Short wavelength
Higher frequency

Question 21

When a source is moving away from you
state the size of the wavelength and frequency

Answer 21

longer wavelength
shorter frequency

Question 22

uses of radiowaves

Answer 22

radio and tv

Question 23

Uses of microwaves

Answer 23

mobile phone communication
heat up food

Question 24

What is the order of electromagnetic spectrum

Answer 24

Radio
Microwaves
Infared
Visible
Ultraviolet
X-ray
Gamma

Question 25

Uses of infared

Answer 25

electric heater night vision

Question 26

Uses of visible light

Answer 26

Photography Optical fibres

Question 27

Uses of ultraviolet

Answer 27

fluoresence detecting banknotes

Question 28

Uses of x-ray

Answer 28

see broken bones and fracture

Question 29

Uses of gamma radiation

Answer 29

killing microbes sterilise medical equipment

Question 30

Dangers of microwaves

Answer 30

internal body heating

Question 31

Dangers of infared

Answer 31

skin burn skin cancer

Question 32

Dangers of ultraviolet

Answer 32

blindness damage surface cells surface

Question 33

Dangers of gamma

Answer 33

Mutate DNA leading to cancer

Question 34

What is refraction

Answer 34

Refraction is when the light wave passes through another material of a different density and changes speed and changes direction as it passes through it.

Question 35

What effects does refraction have on light

Answer 35

it slows light down and changes direction and the wave length decreases

Question 36

What is critical angle

Answer 36

The angle of incidence for which the angle of refraction is 90 degrees is called as the critical angle

Question 37

Uses of total internal reflection

Answer 37

optical fibres and periscope

Question 38

When will total internal reflection occur

Answer 38

when angle of incident is greater than critical angle

Question 39

Why do longitudinal waves not travel in space

Answer 39

Because they need a medium

Question 40

Name the 8 energy stores

Answer 40

Nuclear, chemical, magnetic, gravitational potential, kinetic, thermal, elastic potential, electrostatic

Question 41

4 ways of energy transfer

Answer 41

mechanically electrically heating radiation

Question 42

What is conduction

Answer 42

Conduction is the transfer of thermal energy through solid materials by direct contact.

Question 43

What is convection

Answer 43

Convection occurs in fluids (liquids and gases) because their particles are free to move.

Question 44

What is radiation

Answer 44

Heat can also be transferred by infra-red radiation, which involves the transmission of thermal energy by electromagnetic waves

Question 45

Are dull surfaces good absorbers or good emitters and is shiny surfaces good absorbers or good emitters

Answer 45

Dull surfaces are good absorbers and emitters of infrared radiation whereas shiny surfaces are poor absorbers and emitters (although they easily reflect heat)

Question 46

How many kelvin is 0 celcius

Answer 46

273

Question 47

How can speed of a motor be increased

Answer 47

Increase current increase strength of magneticv current Increase number of turns in coil

Question 48

how to increase voltage produced in a generator

Answer 48

the strength of the magnet is increased the number of turns on the coil is increased the magnet is moved into the coil of wire faster

Question 49

What is an isotope

Answer 49

Isotopes are atoms of an element with the same number of protons but a different number of neutrons in their nucleus

Question 50

What is a alpha particle

Answer 50

Alpha particles are made up of two protons and two neutrons so they are identical to the nucleus of a helium atom.

Question 51

What is beta particle

Answer 51

A beta particle is an electron which is emitted from an atom when a neutron turns into a proton

Question 52

What is used to measure the activity of radioactive source

Answer 52

Geiger-Muller tube

Question 53

What is background radiation

Answer 53

Background radiation is a measure of the level of ionizing radiation present in the environment

Question 54

What is activity

Answer 54

The ‘activity’ of a radioactive source is the number of decays per unit time and is measured in becquerels.

Question 55

What is half life

Answer 55

time taken for the activitiy level to halve

Question 56

Uses of radioactivity

Answer 56

Smoke detectors: alpha Thickness monitoring: beta diagnosis: gamma

Question 57

What is contamination

Answer 57

when radioactive material is deposited on or in an object or a person

Question 58

what is irradiation

Answer 58

If a radioactive source is placed near an object and exposed to its radiation without coming into contact with it, the object is irradiated.

Question 59

What is nuclear fission

Answer 59

Nuclear fission is the process of splitting a nucleus to release energy.

Question 60

What happens during nuclear fission

Answer 60

When a uranium-235 nucleus absorbs a neutron, this alters the ratio of protons to neutrons in the nucleus making it unstable. The unstable nucleus splits into two daughter nuclei and two or three neutrons.

Question 61

What are moderator usually made of

Answer 61

graphite

Question 62

What is the function of a moderator

Answer 62

slow neutrons down so they can be absorbed by other nucleas

Question 63

What is nuclear fusion

Answer 63

Nuclear fusion is where two small, light nuclei collide at high speed and join together to make one heavy nucleus

Question 64

order this in increasing size universe, satellite, galaxy, milky way, earth

Answer 64

Earth, satellite, milky way, galaxy, universe

Question 65

How does a asteriod orbit the sun and where is it fastest and slowest and which way does the tail point

Answer 65

In a elliptical shape near sun fastest

Question 66

What colour is the highest temp

Answer 66

blue