CSEE
Physics · Paper 1 · 2011
19 questions 🇹🇿 NECTA
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Questions (19)
Section A
3.
10 marks
For each of the items (i)-(x) fill in the blank spaces by writing the correct answer on the answer booklet provided.
(i)
___________ is an instrument which can be used in submarines to view distant objects which are out of direct vision.
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(ii)
___________ is a coil of low resistance used to control an alternating current.
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(iii)
The property of a liquid to form a layer which support a pond skater to walk on it is called ______________.
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(iv)
According to Archimedes principle upthrust is equal to ________________.
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(v)
___________ is a refreezing process which demonstrate the effect of pressure on the melting point of ice.
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(vi)
To convert a moving coil galvanometer into a voltmeter _______________ is connected in series with the coil of the galvanometer.
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(vii)
The instrument used to record ground movements caused by an earthquake is called ____________.
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((viii)
____________ is a large celestial body made up of hot gases known as plasma.
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(ix)
The process in which the emission of radiation by the atmosphere warms the earth’s surface is called ____________.
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(x)
____________ of water is the decrease in the density of water as it cooled from 4°C to 0°C.
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4.
1 mark
Which of the following sources of energy are non-renewable?
A.
Water, wind, wood and natural gas.
B.
Fossils, sun, oil and nuclear.
C.
Natural gas, water, nuclear and wood.
D.
Wind, sun, fossils and oil.
E.
Oil and all natural gas.
5.
0 marks
Heat and temperature are closely related but they are different. State how they are related and how they differ.
(a)
State how they are related and how they differ.
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(b)
What are the fixed points of a thermometer?
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(c)
The temperature of the melting point of ice and that of steam above water boiling at 760mmHg pressure are marked as 20 and 80 respectively on a certain thermometer. Calculate the thermometer reading when the temperature is 60°C.
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6.
0 marks
Figure 1 illustrates part of the displacement-time graph of a wave traveling across water at a particular place with a velocity of 2m/s. Calculate:
(a)
What is a sonometer?
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(b)
Briefly explain when resonance is said to occur?
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(c)
Two boys at 200m apart stand on one side of a high vertical cliff at the same perpendicular distance from it. When one fires a gun, the other hears the sound 0.6 seconds after the flash and the second sound 0.25 seconds after the first sound. Calculate the perpendicular distance of the two boys from the cliff.
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(d)
the amplitude.
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(e)
the frequency
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(f)
the wavelength
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7.
0 marks
.
(a)
What are sustainable energy sources?
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(b)
State four applications of energy generated from water.
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(c)
Define geothermal energy.
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(d)
Briefly explain how geothermal energy can be harnessed.
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(e)
What is a windmill?
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(f)
Mention three disadvantages of energy caused by wind.
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(g)
Does wind itself possess energy? Explain.
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8.
0 marks
If the resistances of the ammeters in Figure 2 are ignored, explain each of the following observations: Figure 2
(a)
Explain what will happen when three 1.5V – cells are connected:
(i) in series
(ii) in parallel
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(b)
when switch S is closed, the current through A is less than that through A .
1 2
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(c)
when switch S is opened, the current through A falls.
2
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(d)
when switch S is opened, the current through each ammeter is the same.
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9.
0 marks
.
(a)
Define the term earthquake.
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(b)
Briefly explain the meaning of the following terms as used on earthquake:
(i) Hypocentre
(ii) Epicentre
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(c)
What is global warming?
Name four gases that contribute to global warming and give one source of each.
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Section B
2.
10 marks
Match the items in List A with responses in List B by writing the letter of the correct response beside the item number.
(i)
Mirage
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(ii)
Refractive index
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(iii)
Critical angle
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(iv)
Floating body
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(v)
Brownian movement
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(vi)
Viscosity
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(vii)
The siphon
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((viii)
A couple
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(ix)
Capillarity
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(x)
Surface tension
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Section C
10.
10 marks
Answer one (1) question from this section.
(a)
(i) State the Law of Floatation.
(ii) Mention two conditions that can make an object float.
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(b)
(i) Draw a well-labeled diagram of a hydrometer.
(ii) Briefly explain how hydrometer can be used to measure the relative density of a liquid.
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(c)
An iron cube of mass 480g and density 8g/cm3 is suspended by a string so that it is half immersed in an oil of density 0.9g/cm3. Find the tension in the string.
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11.
10 marks
Answer one (1) question from this section.
(a)
(i) What is meant by a fuse?
(ii) Briefly explain why fuse are made of very thin wires but heaters are made of thick wires.
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(b)
(i) State how short circuit occurs in a house?
(ii) Mention two causes of electrical short-circuit.
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(c)
(i) Fuse wires are labeled 3A, 5A, 10A, 12A, 18A and 20A. Select the best fuse for a 240V; 2.856kW electric kettle.
(ii) Describe with the aid of circuit diagram, how would you determine the resistance of a conductor using the ammeter-voltmeter method.
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