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In an experiment to demonstrate atmospheric pressure, a plastic bottle is partially filled with hot water and the bottle is then tightly corked. After some time the bottle starts to get deformed.
i) State the purpose of the hot water
ii) State the reason why the bottle gets deformed
iii) Explain your answer in (ii)
Date posted:
February 6, 2017
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When a bicycle pump was sealed at the nozzle and the handle slowly pushed towards the nozzle, the pressure of the air inside increased. Explain this observation.
Date posted:
February 6, 2017
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Some water in a tin can was boiled for some time. The tin can was then sealed and cooled. After some time it collapsed. Explain this observation
Date posted:
February 6, 2017
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The total weight of a car with passengers is 25, 000 N. The area of contact of each of the four tyres with the ground is 0.025m2. Determine the minimum car tyre pressure
Date posted:
February 6, 2017
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State one advantage of fitting wide tyre on a vehicle that moves on earth roads.
Date posted:
February 6, 2017
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The height of the mercury column in a barometer at a place is 64 cm. What would be the height of a column of paraffin in barometer at the same place?
(Density of paraffin = 8.0 X 102kgm-3)
Date posted:
February 6, 2017
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A small nail may pierce an inflated car tyre and remain there without pressure reduction in the tyre. Explain this observation.
Date posted:
February 6, 2017
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A solid weighs 16.5 N on the surface of the moon. The force of gravity on the moon is 1.7NKg-1. Determine the mass of the solid.
Date posted:
February 6, 2017
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A steel needle when placed carefully on water can be made to float. When a detergent is added to the water it sinks. Explain this observation
Date posted:
February 6, 2017
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State ways of reducing surface tension in water.
Date posted:
February 6, 2017
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A bag of sugar is found to have the same weight on planet earth as an identical bag of dry sawdust on planet Jupiter. Explain why the masses of the two bags must be different.
Date posted:
February 6, 2017
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A metal pin was observed to float on the surface of pure water. However the pin sank when a few drops of soap solution were carefully added to the water. Explain this observation
Date posted:
February 6, 2017
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State the reason why water spilled on a glass surface wets the surface.
Date posted:
February 6, 2017
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A butcher has a beam balance and masses 0.5 kg and 2 kg. How would he measure 1.5 kg of meat on the balance at once?
Date posted:
February 6, 2017
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Give reason why the weight of the body varies from place to place.
Date posted:
February 6, 2017
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A student measured the length of a wire four times using a metre rule and obtained the following readings: 18.6 cm; 18.5 cm and 18.6 cm. Determine the length the length the student should record
Date posted:
February 6, 2017
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State the reason why it is not correct to quote the weight of solid objects in kilograms
Date posted:
February 6, 2017
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A stopwatch started 0.50s after the start button was pressed. The time recorded using the stopwatch for a ball bearing falling through a liquid was 2.53s. Determine the time of fall.
Date posted:
February 6, 2017
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A drug manufacturer gives the mass of the active ingredient in a tablet as 5 mg. Express this quantity in kilogramme and in standard form.
Date posted:
February 6, 2017
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Give reasons why a safety seat belt used in a vehicle;should have a wide surface area and should be slightly extensible.
Date posted:
January 16, 2017
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A girl throws tennis ball vertically upwards from a truck moving at a constant velocity. Give the reason why the ball lands back exactly the same point where it was projected.
Date posted:
January 16, 2017
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When a steel ball bearing is dropped into a tall jar full of glycerine, it falls to reach a point when it attains a steady velocity. State the force that varies to make this possible.
Date posted:
January 16, 2017
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Milk in a bottle cools faster when the bottle is wrapped with a wet towel than when it is immersed in a bucket of cold water. Explain
Date posted:
January 16, 2017
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State samples of bromine vapour are allowed to diffuse separately under different conditions; one in vacuum and the other in air. State and explain the observation made.
Date posted:
January 16, 2017
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It is easier to stop a saloon car than a bus moving at the same velocity. What is the reason?
Date posted:
January 14, 2017