Olympiad Test: Winds, Storms And Cyclones
20 Questions MCQ Test Science Olympiad Class 7 | Olympiad Test: Winds, Storms And Cyclones
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Which of the following will rises the highest?
Warmer air rises higher. This is because gases expand when they are heated.
An anemometer is an instrument that is most similar to a
Cold winds usually show ______ movements, while warm winds usually show ______ movements.
When a vehicle moves very fast, a/an ______ is created temporarily behind it.
When a wind flows very fast, a low pressure is produced temporarily which is filled by the rushing wind nearby.
Which of the following statements is incorrect?
On heating, gases become ______ because the molecules ______.
Upon heating, the molecules in the gases go further away from each other and thus become lighter.
The monsoon winds that carry a lot of water to India come from the
The winds coming from the southwest blow over the Indian ocean and bring lots of rains.
During the formation of rain, when water vapour changes back to liquid in the form of rain drops:
The energy contained in the gaseous form (vapour) is more than the energy contained in the liquid form (water), therefore when vapour changes to water it loses some heat.
Which of the following is the best thing to do during heavy lightning?
How do cyclones decrease the fertility of the soil in the coastal areas?
Salinity is harmful to the plants. During cyclones, the sea waves rise high and flood the land making the soil saline (infertile).
Which of the following is the first sign of an approaching cyclone?
Even when the cyclone is very far, strong winds push water towards the shore causing huge water waves.
The winds on the earth do not flow in the exact “north to south” or “south to north” directions because
Sea and land breezes are caused because of
Sea and land breezes are caused because of an uneven heating of the earth and through convection currents.
Which of the following doesn’t show that air has pressure?
A ball falls down to the ground because of gravity.
During the take-off of an aeroplane there is a ______ pressure on the top and a ______ pressure below.
Because of the curved upper surface of the aeroplane more air flows in the same time as compared to the lower surface. Therefore, the pressure over the aeroplane is less when compared to the lower surface.
Which condition is necessary for the development of cyclonic storm?
Which country is most likely to be affected by cyclones?
While drinking a soft drink with the help of a straw, the pressure in the straw is ______ and the pressure in the bottle is ______.
When we suck into the straw, a low pressure is created in it, which makes the higher pressure in the bottle to push the drink into the straw.
Which of the following is most likely to be in the ‘eye’ of a cyclone?
What is the best thing to do when strong winds are blowing over a hut having a weak thatched roof?
When winds blow over a weak roof, it creates a low pressure over it and a high pressure inside causing the roof to be blown off.
Opening the doors and windows reduces this pressure difference and avoids the roof from being blown off.
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