Test
P2-quiz
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Preguntas del test (26)
1What are the 'packets' of energy in a beam of electromagnetic radiation called?
- AElectrons
- BPhotons
- CProtons
2where on the electromagnetic spectrum is visible light?
- Aright
- Bcentre
- Cleft
3Which part of the electromagnetic spectrum has the highest energy photons?
- Aleft (radio waves)
- Bcentre (visible light)
- Cright (gamma rays)
4Which of these is an ionising radiation?
- AMicrowaves
- BVisible light
- CUltra violet
5What speed does electromagnetic radiation travel at in a vacuum?
- A300 000 km/s
- B300 m/s
- C300 km/s
6Materials are heated when they absorb:
- Aelectromagnetic radiation of any type
- Binfrared radiation only
- Cmicrowaves and infrared only
7If a detector is moved away from the source, what happens to the intensity detected?
- AIt decreases
- BIt increases
- CIt is the same
8
The intensity of microwaves in an oven is given by its power in watts. Which microwave oven will result in the hottest potato?- A500 watts for 5 minutes
- B600 watts for 4 minutes
- C800 watts for 3 minutes
9Why does ionising radiation cause chemical reactions when it is absorbed?
- A
The radiation heats the absorber.
- BRadiation is made up of photons.
- CMolecules in the absorber are broken into bits
- A
10
Which of these radiations is totally absorbed by the atmosphere?- AMicrowaves
- BInfrared
- CGamma rays
11
Which electromagnetic radiation provides the energy for photosynthesis?- AInfrared
- BLight
- CUltraviolet
12
Ultraviolet
3.
Why are microwave ovens safe to use?- AMicrowaves are reflected by the metal sides and door screen
- BMicrowaves cannot damage cells.
- CMicrowaves are non-ionising.
13
Which of these is a benefit of sunbathing?- ASkin cancer.
- BSunburn.
- CVitamin D produced in the skin.
14
Which of these is a risk of sunbathing?- A A sun tan.
- BSkin cancer.
- CVitamin D produced in the skin.
15
What is the difference between perceived and real risk?- APerceived risk is people's opinion, real risk is statistically calculated
- BReal risk is people's opinion, perceived risk is statistically calculated
- CThere is no difference
16
Which of these is the percentage of carbon dioxide in the atmosphere?- ALess than 0.1 %
- BAbout 20 %
- CAbout 70 %
17
Which process removes carbon dioxide from the atmosphere?- ACombustion
- BPhotosynthesis
- CRespiration
18
Which process returns carbon dioxide to the atmosphere?- ACombustion
- BDissolving in the oceans
- CPhotosynthesis
19
Which is a possible result of global warming?- AThe weather becomes less changeable
- B
Falling sea levels - CRising sea levels
20
Which of these sentences is the best example of correlation?- ABurning forests leads to more carbon dioxide in the atmosphere
- BCarbon dioxide contains carbon and oxygen
- C The carbon dioxide in the atmosphere is very small
21
If there is a correlation between a factor and an outcome, what is needed to show that the factor causes the outcome?- AA larger sample size in the study
- BA scientific explanation for the way in which the factor can cause the outcome
- CMore experiments testing the factor and the outcome
22
Infrared signals can be transmitted by:- Athe internet
- Boptical fibres
- Cmorse code
23
Some signals are made of a series of pulses which are just off or on. These are called:- Aanalogue signals
- Bdigital signals
- Cwave signals
24
Which sort of signal can transmit information with higher quality?- Aanalogue
- Bdigital
- Cthey are both the same
25
The amount of information needed to store information is measured in:- Avolts
- Bbytes
- Cvolume
26
Signals can pick up random additions on their way to the receiver, making the quality poorer. What word is used for these 'random additions'?- Adirt
- B noise
- Crubbish
Información
- Descripción
- Radiation and life
- Autor
- Holly Hutchings
- Idioma
- English
- Visitas
- 25
- Historial
- Creado el 26 abr 2014 · actualizado el 6 abr 2018
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test