THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA ADVANCED CERTIFICATE OF SECONDARY EDUCATION EXAMINATIONS
131/1 PHYSICS 1
(For Both School and Private Candidates)
Time 3 Hours Year: 2018
1. This paper consists of sections A and B with a total of ten (10) questions.
2. Answer all questions in section A and two (2) questions from section B.
3. Section A carries seventy (70) marks and Section B carries thirty (30) marks.
4. Marks for each question or part thereof are indicated.
5. Mathematical tables and non-programmable calculators may be used.
6. Cellular phones and any unauthorized materials are not allowed in the examination room.
7. Write your Examination Number on every page of your answer booklet(s).
8. The following information may be useful:
Density of water = 1000 kg/m3
Density of air = 1.3 kg/m 3
Radius of Earth = 6.4 x 10 6 m
Stefan's constant = 5.67 x 10-8 Wm-2 K -4
Solar constant 1.4 kWm -2
Specific heat capacity of water = 4200 Jkg-l
Acceleration due to gravity = 10 m/s2
One gram of water = lcm3
1 atmosphere = 1.013 x 10 5 Pa
Pi, = 3.14
1. (a) (i)How can random and systematic errors be minimized during an experiment?
(ii) Estimate the precision to which the Young's modulus, of the wire can be determined by the formula
given that the applied tension F = 500 N, the length of the loaded wire, I = 3 m, the diameter of the wire, d = 1 mm, the extension of the wire, e = 5 mm and the error associated with these quantities are 0.5N, 2 mm, 0.01 mm and 0.1 mm respectively.
(b) (i)The rotating blades of a hovering helicopter swept out an area of radius 2 m imparting a downward velocity of 8 m/s of the air displaced. Find the mass of the helicopter.
(ii) Compute the mass of water striking the wall per second when a jet of water with a velocity of 5 m/s and cross-sectional area of 3 x 10 -2 m 2 striked the wall at the right angle losing its velocity to zero.
(b) (i) What would happen if gravity suddenly disappears?
(ii) Two bases of a mountain are at sea level where the gravitational field strength is 9.81N/kg. If the value of gravitational field at the top of the mountain is 9.7N/kg, calculate the height of the mountain above the sea level.
(c ) (i) Estimate the maximum power available from 10m2 of solar panels.
(ii) Calculate the volume of water per second which must pass through if the inlet and outlet temperature of the panels are at IO O C and 60 0 C respectively. (Assume the wave carries away energy at the same rate as the maximum power available).