CSEE
Physics · Paper 1 · 2019
25 questions 🇹🇿 NECTA
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Questions (25)
Section A
1.
1 mark
Which pairs of instruments would you use to correctly measure the diameter of a small ball bearing?
A.
Measuring tape and vernier caliper
B.
Slide rule and micrometer screw gauge
C.
Vernier caliper and slide rule
D.
Micrometer screw gauge and vernier caliper
E.
Metre rule and micrometer screw gauge
Section B
2.
5 marks
Match the properties of radiations in List A with the corresponding radiations in List B by writing the letter of the correct response beside the item number in the answer booklet provided. The responses might be used more than once.
| List A | List B |
|---|---|
| (i) Has weak-moderate ionising power. | A. Alpha particles |
| (ii) Is deflected towards south pole of the | B. Beta particles |
| magnet. | C. Gamma rays |
| (iii) Has high penetrating power but stopped | D. Ultraviolet radiation |
| by lead sheet. | E. X-rays |
| (iv) Has the least penetrating power but | |
| stopped by a sheet of paper. | |
| (v) Has a speed up to 10% times the speed | |
| of light in vacuum. |
(i)
Has weak-moderate ionising power.
1 mk
(ii)
Is deflected towards south pole of the magnet.
1 mk
(iii)
Has high penetrating power but stopped by lead sheet.
1 mk
(iv)
Has the least penetrating power but stopped by a sheet of paper.
1 mk
(v)
Has a speed up to 10% times the speed of light in vacuum.
1 mk
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3.
10 marks
SECTION B (60 Marks) Answer all questions in this section.
(a)
In a light experiment, a narrow beam of light directed onto a glass prism leaves the prism and falls on a white screen. Draw a labelled diagram to show the experimental set-up and observation seen on a screen.
5 mk
(b)
Explain two ways in which lens cameras differ from the human eye.
5 mk
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4.
10 marks
SECTION B (60 Marks) Answer all questions in this section.
(a)
Why a bubble of air increases in volume as it rises from the bottom of a pond of water to the surface? Briefly explain.
5 mk
(b)
A half meter rule AB is freely pivoted at 18 cm from end A and balances horizontally when a body of mass 35 g is hung 48 cm from end B. Calculate the mass of the rule.
5 mk
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5.
10 marks
SECTION B (60 Marks) Answer all questions in this section.
(a)
Figure 1 shows a simple machine B which has to be used to pull the packing case of 2000 N into the car by an effort of 500 N. Calculate the efficiency of machine B.
5 mk
(b)
With the aid of a clearly labelled diagram, describe an experiment to investigate the relationship between the force acting on a body and the acceleration produced.
5 mk
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6.
10 marks
SECTION B (60 Marks) Answer all questions in this section.
(a)
A beaker containing ice is heated from -5°C to 0°C and then from 0°C to 15°C. With the aid of a diagram, explain the variation of density with temperature.
5 mk
(b)
A brick at 20°C has a dimension of 30 cm, 18 cm and 10 cm for length, width and height respectively. If a brick is heated to a new temperature of 150°C, calculate the new dimensions.
5 mk
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7.
10 marks
SECTION B (60 Marks) Answer all questions in this section.
(a)
With the aid of a diagram, explain the function of a fuse in an electrical appliance.
5 mk
(b)
A circuit in a house is protected by a 10 A fuse. The circuit is connected to the 240 V mains. The following appliances are connected to the circuit:
Appliance Power rating
Bulb 1 100 W
Bulb 2 75 W
TV 300 W
Heater 1500 W
Determine whether the fuse will blow on or off if all appliances are turned on.
5 mk
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8.
10 marks
SECTION B (60 Marks) Answer all questions in this section.
(a)
Why the inner core of the earth is solid while the outer core is liquid? Briefly explain.
5 mk
(b)
The frequency obtained from a plucked string when the tension is 2 N is 400 Hz. Calculate the frequency when the tension is increased by 6 N.
5 mk
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Section C
9.
4 marks
(a)
Briefly explain three things you can do so that a heavier iron metal block can be lifted.
6 mk
(b)
Why a musician must retune a stringed instrument if its temperature changes?
2 mk
(c)
During a thunderstorm, the time between the flash of light and the thunder is 10 s. How far away is the thunderstorm?
4 mk
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10.
6 marks
(a)
A sample of carbon isotope 14C has a half-life of 5700 years. What fraction of 14C will remain after 11400 years?
6 mk
(b)
Describe the construction and mode of action of the PN junction semiconductor.
6 mk
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11.
7 marks
(a)
Electrical energy is distributed in all parts of Tanzania by the National grid system which transmits alternating current at a very high voltage. Explain why is it necessary to have a very high voltage?
5 mk
(b)
A generator producing a varying current from 0 to 10 A was allowed to flow in a coil of magnetic field. After a time interval the current was observed to be 4 A. Describe how back e.m.f. Was induced in a self-induction.
7 mk
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