6. If the iceberg in the above question is floating on the ocean, how much water will it displace, according to Archimedes principle? (take the density of water as 1000 kg/m3)
2m3
2.17m3
3.45m3
1000m3
7. In waves in deep water, the water particles beneath the waves travel in circles as the wave goes past. For a particle at the surface, at what speed will it move round the circle if the wave height is 2 metres and the wave period is 10 seconds?
63 centimetres per second
63 metres per second
1 metre per second
0.1 metre per second
8. Why is there an inflow of surface water through the Strait of Gibraltar to the Mediterranean Sea?
It replaces water lost from the Med by evaporation
It is driven by the prevailing westerly winds
It replaces water lost from the Med through the Suez canal
It replaces water lost by the Med through a small crack in the sea floor
9. What is the pressure in the ocean (in atmospheres) at a depth of 200 metres?
2000 atm
21 atm
201 atm
1 atm
10. Which of the following best describes a water mass?
A body of water formed at the same place in the ocean with a characteristic temperature and salinity
The mass of water in a particular ocean. E.g Indian
A particularly heavy piece of water
Temperature divided by salinity
11. 8) Densest water is found at the bottom of the ocean. If cold water lies on top of warm it will sink – a process called convection. The atmosphere actually gets colder as you go up, so cold air lies on top of warm. Why doesn’t the cold air sink?
The air is too light so it cannot sink
Because of the spin of the earth - the Coriolis effect
As you go up, the air becomes less dense because the pressure decreases. This counteracts the effect of the cooling
The pressure of the air below holds it up
12. You are standing in the centre of a Merry-go-round which is turning in an anticlockwise sense. If you walk away from the centre, which sort of deflecting force will you feel?
Towards the centre
One towards the left
One towards the right
Towards the edge
13. Which way would you expect air to circulate in a region of low pressure in the northern hemisphere?
Anti-clockwise
Clockwise
Upwards
Towards the centre
14. In deep water, waves with long period go faster. What name do we give to this effect?
dispersion
refraction
diffraction
convection
15. What volume of the iceberg will therefore be visible above the ocean surface?