CSEE
Physics · Paper 1 · 2000
33 questions 🇹🇿 NECTA
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Questions (33)
Section A
1.
1 mark
(i) A vernier scale reads -0.2 mm when closed and 5.7 mm when used to measure the diameter of a piece of wire. What is the true diameter of the wire?
A.
0.2 mm
B.
5.9 mm
C.
5.5 mm
D.
5.7 mm
13.
1 mark
The main function of an electric motor is to
A.
produce motion from electric current
B.
make magnetism
C.
produce electricity from motion
D.
form an electromagnet.
14.
1 mark
A horizontal electron beam passes between two parallel horizontal plates X and Y, plate X being above Y. An electric field is set up such that plate Y is at a positive potential. What will happen to the beam? It will deflect
A.
upwards
B.
sideways to the left
C.
downwards
D.
sideways to the right
15.
1 mark
The main difference between p n p and n p n transistor is that
A.
the majority charge carriers in p n p are electrons but in n p n are holes
B.
the majority charge carrier in p n p are holes but in n p n are electrons
C.
the minority charge carriers in p n p are holes but in n p n are electrons
D.
in n p n holes are repelled from the negative terminal but in p n p the electrons are repelled.
Section B
2.
9 marks
Answer ALL questions. Each question carries 9 marks.
(a)
What is meant by the moment of a force at a point? State its SI unit.
2 mk
(b)
State the conditions for a body to be in equilibrium when subjected to a number of parallel forces.
3 mk
(c)
A uniform wooden bar AB of length 120 cm weighing 1.2 N rests on two sharp edged supports C and D placed 10 cm from its either ends. A 0.20 N load hangs from a loop of a string 3 cm from A and a 0.90 N load hangs at 40 cm from B. Find the:
4 mk
(c (i))
reaction at C
2 mk
(c (ii)
reaction at D
2 mk
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3.
0 marks
(a)
Differentiate between heat and temperature.
2 mk
(b)
Explain why water is not used as a thermometric liquid.
3 mk
(c)
Calculate the specific heat capacity of mercury, if 980 J of heat is required to raise the temperature of 7 g of mercury from 0°C to 1000°C.
3 mk
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4.
0 marks
(a)
Define an echo.
1 mk
(b)
Name any two factors that affect the speed of sound in air.
2 mk
(c)
Explain briefly why sound produced in a hall with many people is heard more clearly than when the hall has a few people.
3 mk
(d)
A person standing 99 m from the foot of a mountain claps his hands and hears an echo 0.6 seconds later. Calculate, the speed of the sound in the air.
3 mk
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5.
0 marks
(a)
Define the ampere and the potential difference.
2 mk
(b)
Derive the expression for the equivalent resistors $R_1$ and $R_2$ connected in parallel.
3 mk
(c)
Three cells each of emf 1.5 V and internal resistance 0.6 Ω are joined in series to form a battery and connected across a 5 Ω resistor. Calculate the p.d. between the terminals of the cell.
2 mk
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6.
0 marks
(a)
Define the terms: astronomy, galaxy and constellation.
3 mk
(b)
Name three heavenly bodies which are closest to the sun.
3 mk
(c)
Differentiate between a comet and a meteorite.
2 mk
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7.
6 marks
(b)
Explain (i) how the chain and ball flushing tank works. (ii) what will happen to the tank when the atmospheric pressure decreases.
3 mk
(a)
Mention any two phenomena which show that air exerts pressure.
2 mk
(c)
A tube has a flat rectangular end which measures 0.4 m by 0.3 m. Calculate the thrust exerted on this end by the atmosphere, if the atmospheric pressure is $1.01 \times 10^5 \text{ N/m}^2$.
3 mk
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8.
8 marks
(a)
What is meant by the principal focus of a converging lens?
1 mk
(b)
What happens to the image of an object placed between the principal focus and a converging lens? Illustrate your answer by using a ray diagram.
3 mk
(c)
An object 4 cm high is placed 20 cm from a converging lens of focal length 8 cm. Determine (i) the distance of the image from the lens. (ii) the magnification. (iii) the height of the image formed.
6 mk
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9.
8 marks
(a)
What is meant by (i) the angle of declination? (ii) the angle of dip? (iii) a magnetic pole?
3 mk
(b)
How can you test the polarity of a magnet? Explain briefly why is attraction not a sure test for polarity.
3 mk
(c)
(i) What is the difference between a magnetic field and an electric field? (ii) How are neutral points obtained in an electric field and in a magnetic field?
3 mk
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10.
5 marks
(a)
State Faraday’s law of electromagnetic induction.
2 mk
(b)
(i) What are the eddy currents? (ii) Mention one advantage and one disadvantage of eddy currents.
3 mk
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Section C
11.
4 marks
(b)
A radon nucleus $_ {86}^{222}Rn$ emits an ᵯ-particle followed by a ᵯ-particle. What are the atomic number and mass number of the nuclei formed after emission?
3 mk
(a)
What are (i) alpha, ᵯ-particles (ii) beta, ᵯ-particles (iii) gamma, ᵯ-rays?
1 mk
(c)
A radioactive element has a half-life of 3 minutes. If the initial count rate is 512 per minute, how long does it take to reach a count rate of 64 per minute? What fraction of the original element is left?
4 mk
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12.
6 marks
When a transistor is connected into a circuit to determine the characteristic curve, the following results are obtained.
| I_b (µA) | I_c (mA) |
|---|---|
| 20 | 1.1 |
| 40 | 2.3 |
| 60 | 3.2 |
| 80 | 4.4 |
| 100 | 5.5 |
(b)
Plot the graph of $I_c$ against $I_b$.
1 mk
(a)
How are intrinsic and extrinsic semiconductors different?
2 mk
(ii)
Draw the best straight line through the points.
1 mk
(iii)
Calculate the slope.
1 mk
(iv)
What property of a transistor does its slope represent?
1 mk
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