CSEE
Physics · Paper 1 · 2015
18 questions 🇹🇿 NECTA ✓ Official NECTA answers
CSEE
🇹🇿 NECTA
✓ Official NECTA answers
Physics · Paper 1 · 2015
18 questions
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200 TZS
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Questions (18)
Section A
1.
2 marks
A spiral spring of natural length 1.50m is extended to 1.505m by a force of 0.80N What will be its extension when the applied force is 3.20N?
A.
0.005m
B.
6.020m
C.
0.020m
D.
4.520m
E.
1.57
3.
0 marks
For each of the items (i)-(x), fill in the blank spaces by writing the correct answer in the answer booklet provided.
(a(i))
The region nearest the earth of which most weather phenomenon occur.
1 mk
(i)
The rate of change of displacement is called __________.
0 mk
(ii)
The process whereby the eye can alter its focal length in order to form images of objects at different distances is known as __________.
0 mk
(a(ii))
The layer in which the ozone layer is found.
1 mk
(a(iii)
The boundary which separates stratosphere and other layers.
1 mk
(iii)
The rule used to deduce the direction of the magnetic field lines due to solenoid or a circular coil is called __________.
0 mk
(iv)
The function of an induction coil is to produce ____________.
0 mk
(a(iv))
The boundary which separates troposphere and stratosphere.
1 mk
(v)
The wheatstone bridge is an electric device used to measure ____________.
0 mk
(a(v))
The region found in exosphere where satellites orbit the earth.
1 mk
(vi)
A force which causes anticlockwise rotation is said to have a positive ____________.
0 mk
(a(vi))
The outermost region of the atmosphere.
1 mk
(vii)
The kinetic theory of matter has been used to account for elasticity, surface tension and ____________.
0 mk
((viii)
The quality of a note produced by a musical instrument depends on its fundamental frequency and __________.
0 mk
(a(vii)
The collective name given to troposphere and stratosphere.
1 mk
(a(ix))
The layer just above the stratosphere in which most meteors burn while entering the earth’s atmosphere.
1 mk
(ix)
The name given to the collection of heavenly bodies that revolve around the sun is ____________.
0 mk
(a(x))
The layer of gases containing numerous small suspended solid and liquid particles that surrounds the earth.
1 mk
(x)
The increase in the average temperature of the world’s atmosphere refers to ____________.
0 mk
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5.
2 marks
What will be the size of the image formed if an object 4cm tall is placed 20cm in front of a concave mirror of focal length 15cm?
A.
60cm
B.
40cm
C.
24cm
D.
12cm
E.
3cm
6.
2 marks
What is the main function of step up transformer?
A.
To change a.c to d.c current
B.
To decrease resistance in a circuit
C.
To increase a.c voltage
D.
To decrease a.c voltage
E.
To increase a.c current
7.
2 marks
The most probable radiation forming a well-defined track when passed in a cloud chamber is called
A.
gamma-rays
B.
beta rays
C.
cathode rays
D.
alpha rays
E.
x-rays
Section B
2.
10 marks
Match the times in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
(i)
The region nearest the earth of which most weather phenomenon occur.
1 mk
(ii)
The layer in which the ozone layer is found.
1 mk
(iii)
The boundary which separates stratosphere and other layers.
1 mk
(iv)
The boundary which separates troposphere and stratosphere.
1 mk
(v)
The region found in exosphere where satellites orbit the earth.
1 mk
(vi)
The outermost region of the atmosphere.
1 mk
(vii)
The layer which is also known as the upper atmosphere.
1 mk
((viii)
The collective name given to troposphere and stratosphere.
1 mk
(ix)
The layer just above the stratosphere in which most meteors burn while entering the earth’s atmosphere.
1 mk
(x)
The layer of gases containing numerous small suspended solid and liquid particles that surrounds the earth.
1 mk
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4.
0 marks
Answer all questions in this section.
(a(i))
What effect does an increase in temperature have on the density of most liquids?
1 mk
((a)(i)
Explain the procedure of using methylated spirit, water and a pendulum bob to find the relative density of spirit.
0 mk
(a(ii))
Explain the procedure of using methylated spirit, water and a pendulum bob to find the relative density of spirit.
3 mk
(a(iii)
The rule used to deduce the direction of the magnetic field lines due to solenoid or a circular coil is called __________.
1 mk
(b(i))
State Archimedes’ Principle.
1 mk
(b(ii))
Briefly explain why does a ship sink deeper in fresh water than in sea water?
2 mk
((b)(i)
Briefly explain why does a ship sink deeper in fresh water than in sea water?
0 mk
(a(iv))
The function of an induction coil is to produce ____________.
1 mk
(a(v))
The wheatstone bridge is an electric device used to measure ____________.
1 mk
(c(i))
Calculate the mass of a piece of wood.
1 mk
((c)(i)
Total volume of a piece of wood given that its relative density is 0.60.
0 mk
(a(vi))
A force which causes anticlockwise rotation is said to have a positive ____________.
1 mk
(c(ii))
Calculate the total volume of a piece of wood given that its relative density is 0.60.
2 mk
(a(vii)
The quality of a note produced by a musical instrument depends on its fundamental frequency and ___________.
1 mk
(a(ix))
The name given to the collection of heavenly bodies that revolve around the sun is ____________.
1 mk
(a(x))
The increase in the average temperature of the world’s atmosphere refers to ____________.
1 mk
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8.
15 marks
Figure 1 shows a comparison of the penetrating power of three types of radiations. Figure 1
(i)
226Ra →_________ + 222Rn.
0 mk
(a(i))
Define nuclear fission.
2 mk
(ii)
222Rn →2 0e +_________.
0 mk
(a(ii))
Mention two products of nuclear fission.
1 mk
((b)(i)
What effect does the radiation B has on the nucleus of an atom?
2 mk
(iii)
What effect does the radiation B has on the nucleus of an atom?
0 mk
((c)(i)
Complete the following equations and for each name the type of decay.
$$^{222}_{86}Rn \rightarrow 2^{0}_{-1}e +_________$$
2 mk
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9.
15 marks
((a)(i)
What is meant by the following terms?
Astronomy.
2 mk
((b)(i)
Distinguish between:
Meteor and meteorites.
3 mk
((c)(i)
With the aid of diagram, describe how ocean tides are formed.
3 mk
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Section C
10.
10 marks
Answer one (1) question from this section.
((a)(i)
What role does a stroboscope play in a ripple tank experiment?
2 mk
((b)(i)
What does a violinist do to change the note emitted by a particular string?
2 mk
((c)(i)
Calculate the frequency of vibration in a resonance tube of shortest length of 0.22m when the next resonance length is 0.47m.
6 mk
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11.
10 marks
Answer one (1) question from this section.
((a)(i)
Explain why moving coil galvanometer is unsuitable for measuring alternating currents.
3 mk
((b)(i)
What would happen on the pattern if a.c were used instead of d.c?
2 mk
((c)(i)
An electric motor is connected by cable to a generator and produce a current of 10A at 240V. Calculate the resistance of the cable.
4 mk
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