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A measuring cylinder contains 20cm3 of water. 10cm3 of salt is added and stirred. Explain why the volume is not 30cm3.
Date posted:
September 18, 2017
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A pipe of radius 0.4cm is connected to another pipe of radius 0.6cm. If water flows in the wider pipe
at a speed of 5ms-1. What is the speed in the narrower pipe
Date posted:
September 18, 2017
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Explain why a car feels lighter as it travels at a higher velocity.
Date posted:
September 18, 2017
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Water wets clean surfaces of glass but not waxed ones. Explain
Date posted:
September 18, 2017
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Name all the forces acting on the mass suspended from a spring balance
Date posted:
September 18, 2017
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State any three effects of force.
Date posted:
September 18, 2017
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Explain why aquatic animals are able to survive under water when the surface is already frozen.
Date posted:
September 16, 2017
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Define the following terms as applied to curved mirrors.
a) Principal axis.
b) Centre of curvature.
c) Principal focus.
Date posted:
September 16, 2017
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Differentiate between the images formed by a convex mirror and a pinhole camera
Date posted:
September 16, 2017
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State three properties of a liquid used in the thermometer
Date posted:
September 16, 2017
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Distinguish between cohesive and adhesive forces.
Date posted:
September 16, 2017
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When mercury in a glass thermometer is used to measure the temperature of hot water, it is observed
that the mercury level first drops before beginning to rise. Explain.
Date posted:
September 16, 2017
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A metal ball is cooled, state how the density of the ball will be affected
Date posted:
September 16, 2017
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Explain how air enters the barrel of a Bunsen burner when the gas supply is opened.
Date posted:
September 16, 2017
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Explain how dynamic lift of the aeroplane is caused by the wings
Date posted:
September 16, 2017
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Define the term streamline flow.
Date posted:
September 16, 2017
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Explain how heat loss by radiation is minimized in a vacuum flask.
Date posted:
September 16, 2017
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State one factor which affects stability of objects.
Date posted:
September 16, 2017
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A meter rule is balanced by masses of 18g and 12g suspended from its ends. Find the position of its pivot point.
Date posted:
September 16, 2017
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The volume of a fixed mass of gas collected at 73⁰C is 0.04m³ at normal atmospheric pressure. Determine the volume when the temperature drops to 10⁰C at the same pressure.
Date posted:
September 16, 2017
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Explain why convection currents in gases are set up much faster than convection currents in liquids.
Date posted:
September 16, 2017
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In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.24mm³ was placed on a clean water surface. The oil spread into a patch of area 4.2 x 10⁴mm². Estimate the size of a molecule of olive oil and express your answer in meters.
Date posted:
September 16, 2017
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Explain how aquatic animals and plants survive in a lake whose top layer is ice at 0oC.
Date posted:
September 16, 2017
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Explain why the smell of a rotting body is very strong when the sun is hot as compared to early in the morning.
Date posted:
September 16, 2017
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Explain how oiling still water controls the breeding of mosquitoes
Date posted:
September 16, 2017
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If the ball is spinning in the anticlockwise direction, the ball is seen to move upwards from its initial path. Explain
Date posted:
September 16, 2017
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Explain how the braking system of a car works.
Date posted:
September 15, 2017
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A magnetized bar is passed over a bunsen flame several times. When tested it is found to be demagnetized. Explain this observation.
Date posted:
September 15, 2017
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An uncharged metal rod is brought close but not touching the cap of a charged electroscope causes a decrease in the divergence of the leaf. Explain.
Date posted:
September 15, 2017
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Give a reason why an air bubble increases in volume as it ascends to the surface of the liquid in a boiler.
Date posted:
September 15, 2017