CSEE
Physics · Karatasi 1 · 2010
22 maswali 🇹🇿 NECTA ✓ Majibu rasmi ya NECTA
CSEE
🇹🇿 NECTA
✓ Majibu rasmi ya NECTA
Physics · Karatasi 1 · 2010
22 maswali
💰 Fanya mtihani kamili
TZS 200
Mtihani wa saa 3 wa muda · husahihishwa kiotomatiki · huhesabiwa kwenye nafasi
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Maswali (22)
Sehemu A
1.
0 alamas
Which one of the following statements about alpha and beta particles is correct?
A.
They carry the same charge.
B.
Each alpha particle has four times the mass of the beta particle.
C.
Alpha particles have a larger range in air than beta particles.
D.
When in motion, they are deflected in opposite directions by a magnetic field.
E.
Alpha particles cause ionization while beta particles do not.
7.
8 alamas
(a)
What is meant by the terms solenoid and electromagnetic induction?
2 alama
((a)(i)
List down two applications of electromagnetics.
1 alama
(b)
Describe the structure and mode of action of a simple d.c. motor.
3 alama
(b)
Describe the structure and mode of action of a simple d.c. motor.
3 alama
(c)
Draw a diagram of an electric bell showing the polarity of the electromagnet, the direction of the current, the core, the yoke, spring and the armature.
3 alama
((c)(i)
Explain what will happen to the mode of action of the electric bell if the core and yoke are made of steel instead of soft iron.
2 alama
(ii)
Explain what will happen to the mode of action of the electric bell if the core and yoke are made of steel instead of soft iron.
2 alama
Boresha ili kuona majibu ya mfano.
8.
9 alamas
(a)
What particle are emitted in thermionic emission? Explain why they are emitted.
2 alama
((a)(i)
What do you understand by the term transistor?
1 alama
(b)
How a common emitter arrangement of a transistor is stabilized for temperature changes?
2 alama
(ii)
Show the circuit symbol for pnptransistor and npntransistor.
2 alama
((b)(i)
Show the circuit symbol for pnptransistor and npntransistor.
2 alama
(c)
Draw a simple common emitter amplifier circuit using npntransistor as a current amplifier.
3 alama
(c)
Draw a simple common emitter amplifier circuit using npntransistor as a current amplifier.
3 alama
Boresha ili kuona majibu ya mfano.
Sehemu B
2.
10 alamas
Match the times in List A with responses in List B by writing the letter of the correct response beside the item number.
| List A | List B | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (i) Newton’s 3rd Law of motion | A Cells with conducting materials used in electrolysis | ||||||||||
| (ii) Kelvin | B Used in forming thick and real images | ||||||||||
| (iii) Proton | C A measure of electrical work | ||||||||||
| (iv) Voltameters | D Can be detected by means of scintillation counter | ||||||||||
| (v) Kwhr | E The moon is in penumbra of the shadow of the Earth | ||||||||||
| (vi) Radiation | F The moon is in the umbra of the shadow of the Earth | ||||||||||
| (vii) Intrinsic semiconductor | G Action equals reaction | ||||||||||
| (viii) γ-radiation | H Thermodynamic temperature | ||||||||||
| (ix) Venus | I The moon is in the umbra of the shadow of the Earth | ||||||||||
| (x) Total Lunar eclipse | J Rate of change of momentum | ||||||||||
| K Degrees centigrade | |||||||||||
| L Measure of power generated | |||||||||||
| M Heat transfer which requires material medium | |||||||||||
| N Applied in construction for reinforcing concrete structures | |||||||||||
| O A morning star | |||||||||||
Onyesha safu 20 zote
| |||||||||||
(i)
Newton’s 3rd Law of motion
1 alama
(ii)
Kelvin
1 alama
(iii)
Proton
1 alama
(iv)
Voltameters
1 alama
(v)
Kwhr
1 alama
(vi)
Radiation
1 alama
(vii)
Intrinsic semiconductor
1 alama
((viii)
γ-radiation
1 alama
(ix)
Venus
1 alama
(x)
Total Lunar eclipse
1 alama
Boresha ili kuona majibu ya mfano.
3.
9 alamas
Answer all questions in this section.
(a)
What is meant by the terms heat capacity and specific heat capacity? State how they are related.
3 alama
(a)
What is meant by the terms heat capacity and specific heat capacity? State how they are related.
3 alama
(b)
Explain briefly how heat losses have been prevented in a vacuum flask.
3 alama
(b)
Explain briefly how heat losses have been prevented in a vacuum flask.
3 alama
(c)
A heater of 500W is used to raise the temperature of 50 kg of material of specific heat capacity of 960J/kg K, from 18°C to 38°C. Assume that all of the heat from the heater is given to the material. Calculate:
4 alama
(c (i))
heat capacity of the material
2 alama
((c)(i)
the time taken in seconds.
2 alama
(c (ii)
the time taken in seconds.
2 alama
Boresha ili kuona majibu ya mfano.
4.
7 alamas
Answer all questions in this section.
(a)
(i) Explain the terms opaque and translucent and give an example of each.
2 alama
(a (ii)
Danger signs along the road as well as tail and brake lamps of motor vehicles rear are painted red. Briefly explain the reason behind.
1 alama
((a)(i)
Danger signs along the road as well as tail and brake lamps of motor vehicles rear are painted red. Briefly explain the reason behind.
1 alama
(b)
What is the basic difference between real and virtual image as formed by curved surfaces.
2 alama
(b)
What is the basic difference between real and virtual image as formed by curved surfaces.
2 alama
(c (i))
Give two reasons why convex mirror are used as driving mirror?
2 alama
((c)(i)
A convex mirror of focal length 18cm produces an image on its axis 6cm away from the mirror. Calculate the position of the object.
3 alama
(c (ii)
A convex mirror of focal length 18cm produces an image on its axis 6cm away from the mirror. Calculate the position of the object.
3 alama
Boresha ili kuona majibu ya mfano.
5.
7 alamas
Answer all questions in this section.
(a (i))
Define the terms astronomy and asteroids.
2 alama
((a)(i)
Is scorpion a galaxy or a constellation? Give reason for your answer.
1 alama
(a (ii)
Is scorpion a galaxy or a constellation? Give reason for your answer.
1 alama
(b (i))
Distinguish between a planet and a star
1 alama
(b (ii)
Distinguish between a comet and a meteor
1 alama
((b)(i)
Distinguish between a comet and a meteor.
1 alama
(c (i))
Which planet in the solar system is closest to the Sun?
1 alama
(c (ii)
Which planet in the solar system is closest to the earth?
1 alama
(c (iv)
Which planet in the solar system is surrounded by rings?
1 alama
((c)(i)
surrounded by rings?
1 alama
((c)(v)
the second largest planet?
1 alama
(c (v))
Which planet in the solar system is the second largest planet?
1 alama
Boresha ili kuona majibu ya mfano.
Sehemu C
6.
4 alamas
(a (i))
State Ohm’s Law.
1 alama
(c)
State briefly the variation of the potential over a pear-shaped conductor and the variation of density of the charge.
2 alama
(a (ii)
Explain briefly, with the aid of a circuit diagram, how you would verify Ohm’s law in the laboratory.
3 alama
((c)(i)
An electron passes between two plates, one of which A, carries a positive charge and the other B a negative charge. What is the effect on the electron?
2 alama
((a)(i)
Explain briefly, with the aid of a circuit diagram, how you would verify Ohm’s law in the laboratory.
3 alama
(ii)
An electron passes between two plates, one of which A, carries a positive charge and the other B a negative charge. What is the effect on the electron?
2 alama
(b)
How would you know when is necessary to recharge an accumulator?
2 alama
(b)
How would you know when is necessary to recharge an accumulator?
2 alama
Boresha ili kuona majibu ya mfano.
9.
6 alamas
An object is seen to fall from an aeroplane and observed to take 15 seconds in reaching the ground. Assuming that air resistance is negligible, calculate:
(a)
Define acceleration due to gravity and state Newton’s first Law of motion.
2 alama
(a)
Define acceleration due to gravity and state Newton’s first Law of motion.
2 alama
(b)
(ii) the velocity with which the object strikes the ground.
2 alama
((b)(i)
the velocity with which the object strikes the ground.
2 alama
((c)(i)
What distance will the train travel in that time?
4 alama
(c)
(ii) What distance will the train travel in that time?
4 alama
Boresha ili kuona majibu ya mfano.
10.
7 alamas
A light wave is refracted into an optically less dense medium. What change will occur in:
(a)
(ii) Explain how beats are formed.
2 alama
((a)(i)
Explain how beats are formed.
2 alama
((b)(i)
the wavelength.
1 alama
(b)
(iii) the wavelength.
1 alama
((c)(i)
A sound is sent out from the ship and its reflection from the floor of the ocean returns one second later. Assuming that the velocity of sound in water is 1500 m/s, how deep is the ocean?
3 alama
(c)
(ii) A sound is sent out from the ship and its reflection from the floor of the ocean returns one second later. Assuming that the velocity of sound in water is 1500 m/s, how deep is the ocean?
3 alama
Boresha ili kuona majibu ya mfano.
11.
8 alamas
(a)
(ii) Show electromagnetic field lines pattern due to a solenoid.
1 alama
((a)(i)
Show electromagnetic field lines pattern due to a solenoid.
1 alama
(b)
With the aid of a well labeled diagram, explain how an electric bell operates.
4 alama
(b)
With the aid of a well labeled diagram, explain how an electric bell operates.
4 alama
((c)(i)
How can you make a galvanometer read higher voltage values?
2 alama
(c)
(ii) How can you make a galvanometer read higher voltage values?
2 alama
Boresha ili kuona majibu ya mfano.
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