CSEE
Physics · Karatasi 1 · 2001
34 maswali 🇹🇿 NECTA
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TZS 200
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Maswali (34)
Sehemu A
1.
1 alama
A freely suspended bar magnet always comes to rest
A.
with either the N-pole or the S-pole pointing North
B.
in an East-West direction
C.
with its S-pole pointing North and its N-pole pointing South
D.
with its poles pointing in the North-South direction
E.
with its N-pole pointing North and its S-pole pointing South
2.
10 alamas
Match the items in list A with the responses in list B by writing the letter of the correct response beside the item number. Each item carries 1 mark.
(i)
Vernier calipers
1 alama
(ii)
Smell travels so quickly
1 alama
(iii)
Convection currents
1 alama
(iv)
Mars
1 alama
(v)
Levers
1 alama
(vi)
Curved mirrors
1 alama
(vii)
Refractive index
1 alama
((viii)
Vibrations
1 alama
(ix)
Combing hair in a clear dry day
1 alama
(x)
X-rays and ᵯ-rays
1 alama
Boresha ili kuona majibu ya mfano.
10.
6 alamas
(ii)
further emission of a beta (ᵯ) particle
2 alama
(iii)
further emission of a gamma radiation.
1 alama
(a)
Sketch the magnetic field patterns due to a current passing through (i) a long straight wire (ii) a circular coil (iii) a long solenoid. Indicate clearly the direction of current and magnetic field.
4 alama
(b)
Explain briefly how the domain theory of magnetism is used to differentiate a magnetic material from a magnet.
2 alama
(c)
(i) Describe how sounds are transmitted by telephones, explaining the actions of both transmitter and receiver.
(ii) What additional equipment is needed to ensure good communication over long distances?
4 alama
Boresha ili kuona majibu ya mfano.
11.
10 alamas
(a)
Define the following and give one use of each: (i) Capacitor (ii) Diode.
3 alama
(b)
Use the sketch above (Fig. 1) to answer the following:
4 alama
(c)
Draw a sketch circuit for voltage amplification and name the different components used.
3 alama
Boresha ili kuona majibu ya mfano.
Sehemu B
3.
9 alamas
Answer ALL questions in this section.
(a)
(i) Define centre of gravity
(ii) Explain why racing cars should have wide wheel tracks.
2 alama
(b)
State the conditions for stable, unstable and neutral equilibrium and give one example of each condition.
3 alama
(c)
(i) Why should a mechanic choose a long spanner to undo a tight nut?
(ii) A uniform half-metre rule is pivoted at its 30 cm mark. A mass of 50 g hung at the 45 cm mark keeps the rule horizontal. Determine the mass of the half metre rule.
4 alama
Boresha ili kuona majibu ya mfano.
4.
8 alamas
Answer ALL questions in this section.
(a)
(i) Explain the pressure of a gas in terms of the kinetic theory of gases.
(ii) How is diffusion explained by the kinetic theory of gases?
4 alama
(b)
(i) State Charles’s Law.
(ii) Sketch the graph of volume against temperature for a perfect gas.
3 alama
(c)
(i) What is the absolute zero of temperature?
(ii) 150 cm3 of dry gas at 30°C was heated until its volume became 450 cm3. What was the final temperature?
4 alama
Boresha ili kuona majibu ya mfano.
5.
9 alamas
Answer ALL questions in this section.
(a)
(i) Name, draw and mention one use of the three different types of diverging lenses.
(ii) What are the characteristics of the images formed by the diverging lens?
4 alama
(b)
Where should an object be placed such that its image as formed by a converging lens will
(i) at infinity (ii) of the same size (iii) erect?
1 alama
(c)
A nail 6.0 cm long is placed 15 cm away from a convex lens of focal length 10.0 cm. The nail is stuck perpendicular to the optical axis of the lens. Determine the position and height of the nail.
4 alama
Boresha ili kuona majibu ya mfano.
6.
4 alamas
Answer ALL questions in this section.
(a)
State four characteristics of a highly sensitive galvanometer.
2 alama
(b)
(i) What are eddy currents? .
(ii) Give two advantages of eddy currents.
2 alama
Boresha ili kuona majibu ya mfano.
7.
2 alamas
(c)
Explain how a moving-coil galvanometer can be converted into an ammeter and into a voltmeter.
2 alama
Boresha ili kuona majibu ya mfano.
8.
1 alama
(c)
What is the wavelength of these gamma rays?
2 alama
(ii)
What could be their period?
1 alama
(b)
What are ultrasonic vibrations?
1 alama
(a)
Distinguish between mechanical and electromagnetic waves.
1 alama
Boresha ili kuona majibu ya mfano.
Sehemu C
9.
3 alamas
(a)
Explain the terms potential energy and kinetic energy giving one example of each.
3 alama
(ii)
the maximum speed of the bob.
2 alama
(b)
A pendulum bob of mass 50 g is pulled aside to a vertical height of 20 cm from the horizontal and then released. Find the maximum potential energy of the bob
2 alama
(c(i))
Suppose the length of the thread of the pendulum in discussion was 1.0 m, what could its periodic time of oscillation be?
2 alama
(c(ii))
State the principle applied by the pendulum experiment.
1 alama
Boresha ili kuona majibu ya mfano.
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