{"id":204,"date":"2023-04-01T11:52:59","date_gmt":"2023-04-01T11:52:59","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=204"},"modified":"2023-04-01T12:42:18","modified_gmt":"2023-04-01T12:42:18","slug":"uace-physics-paper-1-mock-two-examinations-2019","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/uace-physics-paper-1-mock-two-examinations-2019\/","title":{"rendered":"UACE PHYSICS Paper 1 MOCK TWO EXAMINATIONS 2019"},"content":{"rendered":"

P510\/1
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PHYSICS
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Paper 1
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AUGUST 2019
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UGANDA ADVANCED CERTIFICATE OF EDUCATION
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MOCK TWO EXAMINATIONS 2019
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PHYSICS
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Paper 1
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2 hours 30 minutes.
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INSTRUCTIONS TO CANDIDATES:
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Attempt five <\/strong>questions, including at least one<\/strong>, but not more than two<\/strong> from each of the sections A, B <\/strong>and C<\/strong>.
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Non-programmable scientific electronic calculators may be used.
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Assume where necessary.
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Permittivity of free space e<\/span>o<\/sub> = 8.85 \"\"\/ 10-12<\/sup> Fm-1<\/sup>
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Acceleration due to gravity, g = 9.81 ms-2
\n<\/sup><\/span><\/p>\n

Electronic charge, e <\/em> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = 1.6 \"\"\/10-19<\/sup> C
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Mass of the earth = 5.97 \"\"\/ 1024<\/sup> kg
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Radius of the earth\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0 \"\"\/
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Planck’s constant, h <\/em> = 6.6 \"\"\/ 10-34<\/sup>Js
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Stefan’s Boltzmann’s constant, s<\/span>\u00a0\u00a0\u00a0\u00a0 = 5.7\"\"\/10-8<\/sup> Wm-2<\/sup> K-4<\/sup>
\n\t\t<\/span><\/p>\n

Wien’s displacement constant = 2.9 \"\"\/10-3<\/sup> m K
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Radius of Earth’s orbit about the sun = 1.5 \"\"\/1011<\/sup>m
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Radius of the sun = 7.0 \"\"\/108<\/sup> m
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Specific heat capacity of water = 4.2 \"\"\/103<\/sup>J kg-1<\/sup> K-1<\/sup>
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Specific latent heat of fusion of water = 3.34 \"\"\/105<\/sup>
\n\t\t\tJ kg-1<\/sup><\/em>
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Specific heat capacity of copper = 400 J kg-1<\/sup> K<\/em>-1<\/sup>
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Avogadro’s number NA<\/sub> = 6.02 \"\"\/1023<\/sup>
\n\t\t\tmol<\/em>-1<\/sup>
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Density of water = 1000 kgm-3<\/sup><\/em>
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Gas constant, R = 8.31 J mol-1<\/sup>K-1<\/sup><\/em>
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\n\n\n\n\n\n\n\n<\/colgroup>\n\n\n\n
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Questions attempted<\/span><\/p>\n<\/td>\n

\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
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Marks<\/span><\/p>\n<\/td>\n

\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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SECTION A
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1.\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define angular velocity and centripetal acceleration. (2 marks)
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(ii)\u00a0\u00a0\u00a0\u00a0Derive the expression for the centripetal force on a mass m<\/em>
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moving with uniform speed v<\/em> in a circular path of radius r<\/em>.
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(4 marks)
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(b)\u00a0\u00a0\u00a0\u00a0Explain the variation of the tension in the sting for a particle of mass m<\/em> attached to a string and whirled in a vertical circle of radius r<\/em>.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
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(4 marks)
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(c)\u00a0\u00a0\u00a0\u00a0A car travels round a bend banked at an angle of \"\"\/. If the radius of curvature of the bend is 60 m and the coefficient of friction between the tyres of the car and the road surface is 0.25, calculate the maximum speed at which the car can negotiate the bend without skidding. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4 marks)
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\u00a0\u00a0\u00a0\u00a0(d)\u00a0\u00a0\u00a0\u00a0A satellite of mass 120 kg moves in a circular orbit around the earth at
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a period of 1.9 x 108 <\/sup>s.
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\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Find its height above the earth. (3 marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0Calculate the mechanical energy of the satellite. (3 marks)
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\n\u00a0<\/p>\n

2.\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0State Archimedes’ principle. (1mark)
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(ii) \u00a0\u00a0\u00a0\u00a0A solid weighs 2.45 N when totally immersed in water and 2.06 N in a liquid of density 1800 kgm-3<\/sup>. Find the mass of the solid.
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(3 marks)
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\u00a0\u00a0\u00a0\u00a0(b) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0What is meant by simple harmonic motion? (1 mark)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0Distinguish between damped and forced oscillations. (2marks)
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(c) \u00a0\u00a0\u00a0\u00a0A cylinder of length h, cross-sectional area, A, and density \u03c3 floats in a liquid of density, r<\/span>. The cylinder is pushed down slightly and released.
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Show that the cylinder performs simple harmonic motion.
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(5marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0Derive an expression for the period of the oscillation. (2marks)
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(d) \u00a0\u00a0\u00a0\u00a0A mass of 0.1kg suspended from a spring of force constant 24.5 Nm-1<\/sup> is pulled vertically downwards through a distance of 5.0 cm and released. Find the
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0period of oscillation, (2marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0position of the mass 0.4 seconds after release. (4marks)
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\n\u00a0<\/p>\n

3.\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Account for the existence of intermolecular forces. (2 marks)
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(ii)\u00a0\u00a0\u00a0\u00a0Sketch a graph of potential energy against separation of two molecules in a substance and explain the main features of the graph. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (3 marks)
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\u00a0\u00a0\u00a0\u00a0(b) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Define surface tension in terms of surface energy. (1 mark)
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(ii)\u00a0\u00a0\u00a0\u00a0Use the molecular theory to account for the surface tension of a liquid.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (3 marks)
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(iii) \u00a0\u00a0\u00a0\u00a0Show that the excess pressure, p, in an air bubble inside a liquid over outside pressure is given by\"\"\/where r is the radius of the bubble and g<\/span> its surface tension. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4 marks)
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(c)\u00a0\u00a0\u00a0\u00a0A soap bubble of diameter 1 cm is formed at the top of a capillary tube of diameter 1 mm dipping into a beaker of water. If the surface tensions of water and soap solution are 7.0\"\"\/10-2<\/sup> and 3.0\"\"\/10-2<\/sup> Nm-1<\/sup> respectively, calculate the height of the water in the capillary tube above the water and state any assumptions you have made.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (5 marks)
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(d) \u00a0\u00a0\u00a0\u00a0Explain why large mercury drops flatten out where as small ones assume spherical shapes.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
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\n\u00a0<\/p>\n

4.\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0What is meant by the resultant<\/strong> of a system of forces? (1mark)
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(ii) \u00a0\u00a0\u00a0\u00a0Coplanar forces act on a particle of mass 2 kg as shown in figure 1.
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\"\"\/
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\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

Find the distance moved by the particle in 3 seconds from rest.
\n<\/span><\/p>\n

(6 marks)
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\u00a0\u00a0\u00a0\u00a0(b) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0State two differences between solid friction and fluid friction.
\n<\/span><\/p>\n

(2 marks)
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(ii) \u00a0\u00a0\u00a0\u00a0You are provided with a metre rule and a physics textbook placed on a flat wooden board on a table. Using only what is provided describe how you would determine the coefficient of static friction between the book and the board. \u00a0\u00a0\u00a0\u00a0 (4 marks)
\n<\/span><\/p>\n

(c) \u00a0\u00a0\u00a0\u00a0A non-uniform beam AB of weight 30N and length 2m is hinged to a vertical wall at A and supported in a horizontal position by a string fixed at a point on it at a distance of 0.5m from B connected to the same vertical wall 1.5m above A. If the tension in the string is 40N when a weight of 10N is suspended from end B, find
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0the position of the centre of gravity of the beam, (3 marks)
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\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0the magnitude and direction of the reaction at the wall.
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(4 marks)
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\n\u00a0<\/p>\n

SECTION B
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\n\u00a0<\/p>\n

5.\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Draw sketch graphs to show the variation of relative intensity
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of black body radiation with wavelength for three different temperatures. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
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(ii) \u00a0\u00a0\u00a0\u00a0Explain the appearance of a metal ball placed in a dark room when its temperature is progressively raised from room temperature to just below melting. (3 marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(iii) \u00a0\u00a0\u00a0\u00a0Explain why cavities in a fire look brighter than the rest of the
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fire. (3 marks)
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\u00a0\u00a0\u00a0\u00a0(b) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0State Wien’s and Stefan’s laws of black body radiation.
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(2 marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0The intensity of radiant energy from a black body is a
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maximum at a wavelength of 1.5 x 10-6<\/sup> m. Calculate the temperature of the black body. (2 marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(iii) \u00a0\u00a0\u00a0\u00a0Describe an experiment to compare surfaces as absorbers of
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radiation. (4 marks)
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\u00a0\u00a0\u00a0\u00a0(c) \u00a0\u00a0\u00a0\u00a0The energy intensity received by a spherical planet from a star is
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1.4 x 103<\/sup> Wm-2<\/sup>. The star is of radius 7.0 x 105<\/sup> km and is 1.4 x 108<\/sup> km from the planet from the planet.
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Calculate the surface temperature of the star. (4marks)
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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0State any assumptions you have made in (b) (i) above. (1 mark)
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\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

6.\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Explain the fact that the heat required to raise the temperature
\n<\/span><\/p>\n

of a fixed mass of gas by 1K at constant volume is different from that required when the pressure is kept constant. (2 marks)
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0Describe an experiment to verity Boyle’s law. (4 marks)
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\u00a0\u00a0\u00a0\u00a0(b) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0State the conditions necessary for a reversible isothermal
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process. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
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(ii) \u00a0\u00a0\u00a0\u00a0A fixed mass of gas at a pressure P1<\/sub> and volume V1<\/sub> expands isothermally to a pressure P2<\/sub> and volume V2<\/sub>. Derive an expression for the work done by the gas. (4 marks)
\n<\/span><\/p>\n

(c) \u00a0\u00a0\u00a0\u00a0A gas of volume 2 litres at a temperature of 27o<\/sup>C and pressure of \"\"\/Pa is heated at constant pressure until its volume doubles. It is then cooled at constant volume back to its original temperature before finally being compressed isothermally to its original volume.
\n<\/span><\/p>\n

Draw a p-V diagram of the whole cycle and find the net work done by the gas. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (5 marks)
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(d) \u00a0\u00a0\u00a0\u00a0The pressure P of an ideal gas of density \"\"\/is given by
\n<\/span><\/p>\n

where is the mean-square speed of its molecules.
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Using this expression, show Avogadro’s hypothesis. (3 marks)
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\n\u00a0<\/p>\n

7.\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Define the term specific latent heat of vapourisation. (1 mark)
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(ii)\u00a0\u00a0\u00a0\u00a0Explain briefly why temperature is constant when a solid is
\n<\/span><\/p>\n

changing into a liquid.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
\n<\/span><\/p>\n

(b)\u00a0\u00a0\u00a0\u00a0Describe with the aid of a labelled diagram, an electrical method for determination of specific latent heat of vaporization of a liquid.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
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(7 marks)
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\u00a0\u00a0\u00a0\u00a0(c) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Define the term specific heat capacity of a substance. (1mark)
\n<\/span><\/p>\n

(ii) \u00a0\u00a0\u00a0\u00a0An electrical heater rated 500W is immersed in a liquid of mass 2.0kg contained in a large thermos flask of heat capacity 840\"\"\/ at 28o<\/sup>C. Electrical power is supplied to the heater for 10 minutes. If the specific heat capacity of the liquid is 2.5 \"\"\/103 <\/sup>Jkg-1<\/sup>K-1<\/sup>, its specific latent heat of vaporization is 8.54 \"\"\/103\"\"\/<\/sup> and its boiling point is 78o<\/sup>C, estimate the amount of liquid which boils off stating any assumptions made. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (6 marks)
\n<\/span><\/p>\n

(d)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0What is boiling point of a liquid?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (1 mark)
\n<\/span><\/p>\n

(ii) \u00a0\u00a0\u00a0\u00a0Explain why extra pressure increases the boiling point of a
\n<\/span><\/p>\n

liquid.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

SECTION C
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

8.\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0What is the significance of Millikan’s oil drop experiment?
\n<\/span><\/p>\n

(1 mark)
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0Explain why a constant temperature bath is used in Millikan’s
\n<\/span><\/p>\n

oil drop experiment.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0Define the following terms as used in photo electricity.
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0work function.<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (1 mark)
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0stopping potential.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/strong>\u00a0\u00a0\u00a0\u00a0 (1 mark)
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0(c) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Describe a laboratory experiment to determine Planck’s
\n<\/span><\/p>\n

constant. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (5 marks)
\n<\/span><\/p>\n

    \n
  1. \n
    (ii)\u00a0\u00a0\u00a0\u00a0Electromagnetic radiation of frequency 8.8 \"\"\/ 1014<\/sup> Hz fall onto
    \n<\/span><\/div>\n

    a metal surface whose work function is 2.5eV. Calculate the velocity with which photoelectrons are released from the surface. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4 marks)
    \n<\/span><\/p>\n<\/li>\n<\/ol>\n

    \n\u00a0<\/p>\n

    \"\"\/ \u00a0\u00a0\u00a0\u00a0(d)
    \n<\/span><\/p>\n

    \n\u00a0<\/p>\n

    \n\u00a0<\/p>\n

    \n\u00a0<\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
    \n\u00a0<\/p>\n

    \n\u00a0<\/p>\n

    The diagram above shows two parallel metal plates P and Q each of length 4.0cm and separated by a distance of 4.0cm. A p.d. of 12V is applied between P and Q and the space between P and Q is a vacuum. A beam of electrons of speed 1.0 \"\"\/ 106<\/sup> ms-1<\/sup> is directed midway between P and Q. Find the angle with which the beam emerges from the space between P and Q to the initial direction of the beam. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (6 marks)
    \n<\/span><\/p>\n

    \n\u00a0<\/p>\n

    9.\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Outline the processes involved in the production of X-rays in a
    \n<\/span><\/p>\n

    modern X-ray tube.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0How do X-rays differ from positive rays? (2 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(iii) \u00a0\u00a0\u00a0\u00a0Distinguish between X-ray production and the photoelectric
    \n<\/span><\/p>\n

    effect. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
    \n<\/span><\/p>\n

    (b) \u00a0\u00a0\u00a0\u00a0In an x-ray tube operated at 1.5 \"\"\/ 105<\/sup>V, the target is made of material of specific heat capacity 2.5 \"\"\/ 102<\/sup> J kg-1<\/sup> K-1<\/sup> and has a mass of 0.25kg. Given that one percent of the electric power supplied is converted into x \u2013rays and the rest dissipated as heat in the target.
    \n<\/span><\/p>\n

    If the temperature of the target rises by 8Ks-1<\/sup>, Find:
    \n<\/span><\/p>\n

      \n
    1. \n
      the number of electrons which strike the target every second.
      \n<\/span><\/div>\n

      (4 marks)
      \n<\/span><\/p>\n<\/li>\n<\/ol>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0the shortest wavelength of x- rays produced. (2 marks)
      \n<\/span><\/p>\n

      (c)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define the term specific charge of an electron.\u00a0\u00a0\u00a0\u00a0 (1 mark)
      \n<\/span><\/p>\n

      (ii)\u00a0\u00a0\u00a0\u00a0Describe a laboratory experiment to determine the specific charge (e\/m) of an electron.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 (5 marks)
      \n<\/span><\/p>\n

      \n\u00a0<\/p>\n

      10.\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0Distinguish between radioactivity and nuclear fission. (2 marks)
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0Why are neutrons preferred to charged particles for inducing
      \n<\/span><\/p>\n

      nuclear reactions?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2 marks)
      \n<\/span><\/p>\n

      (b) \u00a0\u00a0\u00a0\u00a0With aid of a labeled diagram, describe the principle of action of an ionization chamber. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (6 marks)
      \n<\/span><\/p>\n

      (c) \u00a0\u00a0\u00a0\u00a01.2g of a substance form a point source of g<\/span>-rays. Only 1 in 1012<\/sup> of its atoms are radioactive and the half-life is 100 days. A Geiger-Muller tube facing the source at a distance of 10 cm gives a count rate of 11 \"\"\/. Given that the window of the tube has an area of 7 cm2<\/sup>, find:
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(i) \u00a0\u00a0\u00a0\u00a0the number of radioactive atoms present. (5 marks)
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii) \u00a0\u00a0\u00a0\u00a0the mass number of the substance. (2 marks)
      \n<\/span><\/p>\n

      \n\u00a0<\/p>\n

      \u00a0\u00a0\u00a0\u00a0(d) \u00a0\u00a0\u00a0\u00a0Determine whether the nucleus \"\"\/ is stable or it may undergo
      \n<\/span><\/p>\n

      disintegration to produce \"\"\/ and an a<\/span>-particle.
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0Mass of 210<\/sup>Po = 209.937u
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0Mass of 206<\/sup>Pb = 205.929u
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0Mass of 4<\/sup>He = 4.002u
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (3 marks)
      \n<\/span><\/p>\n

      \n\u00a0<\/p>\n

      \n\u00a0<\/p>\n

      END<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

      P510\/1 PHYSICS Paper 1 AUGUST 2019 \u00a0 UGANDA ADVANCED CERTIFICATE OF EDUCATION MOCK TWO EXAMINATIONS 2019 PHYSICS Paper 1 2<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,1],"tags":[],"class_list":["post-204","post","type-post","status-publish","format-standard","hentry","category-physics","category-uncategorized"],"yoast_head":"\nUACE PHYSICS Paper 1 MOCK TWO EXAMINATIONS 2019 - MAKTABA EDUCATION CENTER<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-1-mock-two-examinations-2019\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UACE PHYSICS Paper 1 MOCK TWO EXAMINATIONS 2019 - MAKTABA EDUCATION CENTER\" \/>\n<meta property=\"og:description\" content=\"P510\/1 PHYSICS Paper 1 AUGUST 2019 \u00a0 UGANDA ADVANCED CERTIFICATE OF EDUCATION MOCK TWO EXAMINATIONS 2019 PHYSICS Paper 1 2\" \/>\n<meta property=\"og:url\" content=\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-1-mock-two-examinations-2019\/\" \/>\n<meta property=\"og:site_name\" content=\"MAKTABA EDUCATION CENTER\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-01T11:52:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-04-01T12:42:18+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/localhost\/solvefor2\/assets\/images\/kev3\/042222_0926_UACEPHYSICS1.png\" \/>\n<meta name=\"author\" content=\"solvefor2\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"solvefor2\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-1-mock-two-examinations-2019\/\",\"url\":\"https:\/\/edu.co.tz\/notes\/uace-physics-paper-1-mock-two-examinations-2019\/\",\"name\":\"UACE PHYSICS Paper 1 MOCK TWO EXAMINATIONS 2019 - 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