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Define the following terms as used in reflection of light.
a. Incident ray
b. Angle of incidence
c. Reflected ray
d. Normal ray
e. Angle of reflection
Date posted:
October 30, 2017
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Define the terms:
a. Opaque
b. Translucent
c. Opaque
d. Umbra
e. Penumbra
Date posted:
October 30, 2017
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Define the terms :
a. Luminous sources
b. Non luminous sources
Date posted:
October 30, 2017
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Explain the following:
a. Two thin T-shirts are warmer than a single thick one
b. Hot flames go upwards
c. A chimney and a fire help to ventilate a room.
Date posted:
October 30, 2017
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What is thermal equilibrium?
Date posted:
October 30, 2017
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a. Define the terms heat and temperature of stating their SI units
b. How is heat measured?
Date posted:
October 30, 2017
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In designing a solar heater explain the following:
a. Why the pipe is fixed to a dark coloured collector plate.
b. Why the pipe is made of copper
c. Why the pipe is coiled several times
d. Why the collector plate is fixed to an insulator
e. Why the panel front is made of glass.
Date posted:
October 30, 2017
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A man's feet felt cold while standing on cement compare to a wooden floor. Explain.
Date posted:
October 30, 2017
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Which features of the clinical thermometer make it special?
Date posted:
October 30, 2017
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List three main feature of the common liquid-in-glass thermometer.
Date posted:
October 30, 2017
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State four properties of a liquid that is suitable for use in a thermometer.
Date posted:
October 30, 2017
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A mechanic wants to fit an iron ring tightly onto a steel rod of equal diameter to the inner diameter of the ring. Explain how this can be achieved.
Date posted:
October 30, 2017
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State and explain two disadvantages of anomalous expansion of water.
Date posted:
October 27, 2017
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Explain briefly a mechanism by which heat is conducted through a metal.
Date posted:
October 27, 2017
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Force F acts on a body of mass M such that its velocity changes from u to v in time t. Derive from first principles the equation: F=ma.
Date posted:
October 27, 2017
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Explain why water stored in an earthen jar becomes cooler than the one which is stored in a metallic jar.
Date posted:
October 27, 2017
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State and explain the effect of decrease in temperature on the surface tension.
Date posted:
October 27, 2017
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A spring extends by 2cm when a mass of 50g is hanged on it. What force is required to extend it by 2.5cm?
Date posted:
October 27, 2017
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Why is the scald from steam more hurting than that of boiling water?
Date posted:
October 27, 2017
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A driving gear wheel having 25 teeth engages with a second wheel with 100 teeth. If the gear system is 85% efficient, find the mechanical advantage.
Date posted:
October 27, 2017
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What is the purpose of the pear- shaped cross section of a clinical thermometer.
Date posted:
October 27, 2017
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Describe how microwaves are used in determining distances of objects as in the radar
Date posted:
October 27, 2017
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The element of an electric hot plate has a resistance of 80Ohms. What is the energy dissipated when the element is kept on for 20 minutes on a 240V supply
Date posted:
October 27, 2017
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A student stands at a distance 400m from a wall and claps two pieces of wood. After the first clap the student claps whenever an echo is heard from the wall. Another student starts a stopwatch at the first clap and stops it after the twentieth clap. The stopwatch records a time of 50 seconds. Find the speed of sound.
Date posted:
October 27, 2017
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Use the domain theory to explain how an unmagnetized piece of iron becomes magnetized when it is heated and then allowed to cool in a magnetized field.
Date posted:
October 27, 2017
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Explain why the e.m.f of a dry cell drops if a large current is drawn for a short time and then recovers if allowed to rest.
Date posted:
October 27, 2017
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A negatively charged rod is brought rear the cap of a leaf electroscope. The cap is then earthed momentarily by touching with the finger. Finally the rod is withdrawn. The electroscope is found to be positively charged. Explain how this is acquired
Date posted:
October 27, 2017
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State any one form of energy
b) An electric crane lifts a load of 2000kg through a vertical distance of 3.0m in 6 seconds Determine:
i) The work done
ii) The power developed by the crane
The efficiency of the crane if it is operated by an electric motor rated 12.5kw.
Date posted:
October 27, 2017
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When ice is heated, the temperature remains constant until all ice is melted. Explain this observation.
Date posted:
October 27, 2017
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Using the kinetic theory of gases, explain why air inside a tyre exerts pressure on the walls of the tyre
Date posted:
October 27, 2017