{"id":212,"date":"2023-04-01T12:15:31","date_gmt":"2023-04-01T12:15:31","guid":{"rendered":"http:\/\/localhost\/solvefor2\/?p=212"},"modified":"2023-04-01T11:54:11","modified_gmt":"2023-04-01T11:54:11","slug":"uace-physics-paper-2-mock-2020-jinja-joint-examinations-board","status":"publish","type":"post","link":"https:\/\/edu.co.tz\/notes\/uace-physics-paper-2-mock-2020-jinja-joint-examinations-board\/","title":{"rendered":"UACE PHYSICS Paper 2 MOCK 2020 JINJA JOINT EXAMINATIONS BOARD"},"content":{"rendered":"

\"\"\/P510\/2
\n<\/strong><\/span><\/p>\n

PHYSICS
\n<\/strong><\/span><\/p>\n

Paper 2
\n<\/span><\/p>\n

Nov\/Dec, 2020
\n<\/span><\/p>\n

2\u00bd hours
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

JINJA JOINT EXAMINATIONS BOARD
\n<\/strong><\/span><\/p>\n

Uganda Advanced Certificate of Education
\n<\/em><\/strong><\/span><\/p>\n

MOCK EXAMINATIONS \u2013 NOVEMBER 2020
\n<\/strong><\/span><\/p>\n

PHYSICS
\n<\/strong><\/span><\/p>\n

Paper 2
\n<\/strong><\/span><\/p>\n

(Principal Subject)
\n<\/span><\/p>\n

2 hours 30 minutes
\n<\/span><\/p>\n

INSTRUCTIONS TO CANDIDATES:
\n<\/strong><\/span><\/p>\n

Answer only five <\/strong>questions, taking at least one<\/strong> question from each of the sections A<\/strong>, B<\/strong>, C<\/strong> and D<\/strong>, but not<\/strong> more than one <\/strong>question should be chosen from either<\/strong> section A<\/strong> or section B<\/strong>.
\n<\/em><\/span><\/p>\n

Any additional question(s) answered will not<\/strong> be marked.
\n<\/em><\/span><\/p>\n

Mathematical tables and squared paper may be provided.
\n<\/em><\/span><\/p>\n

Non-programmable silent scientific calculators may be used.
\n<\/em><\/span><\/p>\n

Assume where necessary;
\n<\/strong><\/span><\/p>\n

Acceleration due gravity, g \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a09.81m s\u2013 2<\/strong><\/sup>
\n\t\t\t<\/em><\/span><\/p>\n

Speed of light in vacuum, c \u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a03.0 \u00d7 10 8<\/sup> m s \u2013 1<\/strong>
\n\t\t\t\t<\/sup><\/em><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Speed of sound in air \u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a0330 m s \u2013 1<\/sup><\/strong>
\n\t\t\t<\/em><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Electronic charge, e \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0\u00a0\u00a0\u00a01.60 \u00d7 10 \u2013 19 <\/sup>C
\n<\/em><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Electronic mass, me<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a09.11 \u00d7 10 \u2013 31 <\/sup>kg
\n<\/em><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Permeability of free space, \u00b5o<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a04.0\u03c0 \u00d7 10 \u2013 7 <\/sup>H m\u2013 1
\n<\/sup><\/em><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Permittivity of free space, \"\"\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a08.85 \u00d7 10 \u2013 12 <\/sup>Fm \u2013 1 <\/sup>
\n\t\t\t<\/em><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0The Constant, \"\"\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0= \u00a0\u00a0\u00a0\u00a09.0 \u00d7 10 9 <\/sup>F \u2013 1 <\/sup>m
\n<\/em><\/span><\/p>\n

SECTION A<\/strong><\/span>
\n\t\t\t<\/span><\/span><\/p>\n

1.<\/strong>\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define the term reflection of light.<\/em><\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
\n<\/span><\/p>\n

(ii)\u00a0\u00a0\u00a0\u00a0Distinguish between images of real objects formed by convex mirrors and by plane mirrors.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
\n<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0State the laws of refraction of light.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(02 marks)
\n<\/span><\/p>\n

(ii)\u00a0\u00a0\u00a0\u00a0The diagram in figure 1 shows three optical media, A, B and C with parallel boundaries and absolute refractive indices n1<\/sub>, n2<\/sub> and n3<\/sub>
\n\t\t<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0respectively.
\n<\/span><\/p>\n

\"\"\/
\n\t\t<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Use the definition of absolute refractive index of a material medium, to derive Snell’s law.\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(04 marks)
\n<\/span><\/p>\n

(c)\u00a0\u00a0\u00a0\u00a0A ray of monochromatic light is incident from air at 30<\/span>\u00b0<\/span> into a glass slab of refractive index, 1.52. The sides AB and DC of the slab are parallel to a plane mirror placed below the slab as shown in figure 2.
\n<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\"\"\/\u00a0\u00a0\u00a0\u00a0
\n<\/span><\/p>\n

    \n
  1. Draw a diagram showing the whole path of the light ray.\u00a0\u00a0\u00a0\u00a0(01 mark)\u00a0\u00a0\u00a0\u00a0
    \n<\/span><\/li>\n
  2. Determine the angle <\/span>\u03b8<\/span>that the ray makes with the normal to the mirror.\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(04 marks)
    \n<\/span><\/span><\/li>\n<\/ol>\n

    (d)\u00a0\u00a0\u00a0\u00a0Describe an experiment to determine the focal length of a convex mirror, using \u00a0\u00a0\u00a0\u00a0a converging lens of known focal length.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(05 marks)
    \n<\/span><\/p>\n

    2.\u00a0\u00a0\u00a0\u00a0<\/strong>(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0What is meant be the term aperture<\/em><\/strong> of a convex lens.\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0Rays from a distant axial object, incident onto a convex lens form a point image, that subtends an angle of 74<\/span>\u00b0<\/span> at the lensaperture and is a distance of 12.0 cm from the lens. Calculate the size of the lens aperture.\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(03 marks)
    \n<\/span><\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0State the preliminary adjustments of an optical spectrometer.
    \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\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0Describe how an adjusted spectrometer can be used to measure the refractive index of the material of a triangular glass prism of known refracting angle, A.\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(04 marks)
    \n<\/span><\/p>\n

    (c)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Draw a ray diagram of a terrestrial telescope in normal adjustment and
    \n<\/span><\/p>\n

    use it to derive the angular magnification.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(05 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0The erecting lens of the telescope in (i) above has a focal length of
    \n<\/span><\/p>\n

    10.0 cm and an eyepiece lens of focal length 5.0 cm. If its angular magnification is 4.0, how long is the telescope?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    (d)\u00a0\u00a0\u00a0\u00a0State how you can design of a simple microscope with a bigger magnifying power.\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(01 mark)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
    \n<\/span><\/p>\n

    SECTION B
    \n<\/strong><\/span><\/p>\n

    3.<\/strong>\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0Distinguish between;
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Pitch and loudness of a soundnote.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0Fundamental frequency and overtones of a musical instrument.\u00a0\u00a0\u00a0\u00a0
    \n<\/span><\/p>\n

    (02 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0An open-ended pipe of length 0.530 m is sounded at its first overtone. A metal wire of a guitar of length 0.810 m, having 9.0 \u00d7 10 \u2013 4 <\/sup>kg m \u2013 1 <\/sup>is under tension of 100 N. When the wire is plucked in the middle to generate its third harmonic, it resonates with the output of the piped instrument. If the speed of sound in air is 330 m s \u2013 1<\/sup>, determine the end correction for the pipe.\u00a0\u00a0\u00a0\u00a0(04 marks)
    \n<\/span><\/p>\n

    (c)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0What are beats<\/em><\/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\u00a0\u00a0\u00a0\u00a0(02 marks)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0Describe how beats can be used to measure frequency of a given source of sound.\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(05 marks)
    \n<\/span><\/p>\n

    (d) \u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define the termDoppler effect<\/em><\/strong>.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0A bat flying at 10 m s \u2013 1<\/sup> emits waves of frequency 78 kHz as if flies away from a tall building. Calculate the apparent frequency of the reflected waves from the wall that are received by the bat.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    4.<\/strong>\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0What is plane polarized light?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0Calculate the polarizing angle light incident from air into glass of refractive index 1.52\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(02 marks)
    \n<\/span><\/p>\n

    (b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0State Huygens’s principle.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0The incident wave front of plane progressive waves is travelling from deep water to shallow waterand makesan angle of 30\u00b0 with the normal to the interface. The wave front is refracted at an angle of 19.5\u00b0. If the wavelength of the waves in deep water is 0.527 m, determine the wavelength of the refracted waves in the shallow water.\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    (c)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Using well defined symbols, write down an expression for the fringe
    \n<\/span><\/p>\n

    separation in Young’s double slit experiment. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0State the effect of reducing the slits separation on the fringe separation.\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(01 mark)
    \n<\/span><\/p>\n

    (d)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Distinguish between constructive and destructive interference.\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\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0Explain how interference fringes are formed,in an air wedge film between the two glass slides.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(04 marks)
    \n<\/span><\/p>\n

    (e)\u00a0\u00a0\u00a0\u00a0An air \u2013 wedge is formed by two glass slides placed in contact at one end and separated by a razorblade at a position a distance of 15.0 cm from their line of contact. The air \u2013 wedge is illuminated normally from above by light of wavelength 6.0 \u00d7 10 \u2013 7 <\/sup>m. The interference fringes formed by reflection have a separation 1.8 mm. Find the thickness of the razor blade.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(04 marks)
    \n<\/span><\/p>\n

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

    5.<\/strong>\u00a0\u00a0\u00a0\u00a0(a) \u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define the term magnetic flux and state its SI unit.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(02 marks)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0A coil of 10 turns and mean radius 5.0 cm lies with its plane on a flat horizontal table. The plane of the coil is threaded by a magnetic field of 0.85 T making an angle of 60\u00b0 with the horizontal. Calculate the magnetic flux linking the coil.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    (b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Two parallel wires each of length, L<\/strong>, carry currents of the same
    \n<\/span><\/p>\n

    magnitude, I<\/strong>, in opposite directions in free space. The two wires are separated by a distance, d<\/strong>. Derive an expression for the magnetic force exerted on any one of the wires.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    (ii)\u00a0\u00a0\u00a0\u00a0The diagram figure 3 shows three parallel wires P<\/strong>, Q<\/strong> and R<\/strong> each of length 0.500 m carrying currents of 6A<\/strong>, 5A<\/strong> and 2A<\/strong> respectively.
    \n<\/span><\/p>\n

    The distance between P<\/strong> and Q<\/strong> is 2.0 cm while that between Q<\/strong> and R<\/strong> is
    \n<\/span><\/p>\n

    3.0 cm.
    \n<\/span><\/p>\n

    \"\"\/
    \n\t\t<\/span><\/p>\n

    Calculate the resultant force exerted on wire Q.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(05 marks)\u00a0\u00a0\u00a0\u00a0
    \n<\/span><\/p>\n

    (c)\u00a0\u00a0\u00a0\u00a0Describe how a simple current balance is used to investigate the effect of the number of turns of a coil, on the magnetic flux density at the centre of the same plane circular coil.\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(06 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0(d)\u00a0\u00a0\u00a0\u00a0Give one industrial application of magnets.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/p>\n

    6.\u00a0\u00a0\u00a0\u00a0<\/strong><\/span>(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0State Lenz’s law of electromagnetic induction.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
    \n<\/span><\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0Explain why Lenz’s law obeys the principle of conservation of energy.\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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
    \n<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0Describe an experiment for the absolute measurement resistance.
    \n<\/span><\/p>\n

    (06 marks)
    \n<\/span><\/p>\n

    (c)\u00a0\u00a0\u00a0\u00a0A rectangular loop of wire WXYZ <\/strong>measuring 35 cm by 75 cm, has one part inside a uniform magnetic field of flux density, 0.45 T perpendicularly out of the plane of the loop that has a total resistance of 0.23 \u2126 as shown in figure 4
    \n<\/span><\/p>\n

    \"\"\/
    \n\t\t<\/span><\/p>\n

    \u00a0\u00a0\u00a0\u00a0Calculate the size of the;
    \n<\/span><\/p>\n

      \n
    1. E.m.f. induced in the loop when the loop attains a velocity of 3.4 m s \u2013 1<\/sup>.\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(02 marks)\u00a0\u00a0\u00a0\u00a0
      \n<\/span><\/li>\n
    2. Force required to pull the loop from the magnetic field at a constant velocity of 3.4 m s \u2013 1<\/sup>.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
      \n<\/span><\/li>\n<\/ol>\n

      \u00a0\u00a0\u00a0\u00a0(d)\u00a0\u00a0\u00a0\u00a0A circular coil of wire of wire of 3 turns is placed near one open end of a solenoid as shown in figure 5.
      \n<\/span><\/p>\n

      \"\"\/
      \n\t\t<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0When the current flowing in the solenoid is 550 mA, the magnetic flux linking the circular coil is 2.7 \u00d7 10 \u2013 5 <\/sup>Wb. When the current in the solenoid changes at a rate of 6.0 A s \u2013 1<\/sup>, the induced current in the circular loop is 3.6 \u00d710\u2013 4 <\/sup>A.
      \n<\/span><\/p>\n

      \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Determine the;
      \n<\/span><\/p>\n

        \n
      1. Mutual inductance of the solenoid \u2013 coil magnetic linkage.(02 marks)
        \n<\/span><\/li>\n
      2. Resistance of the circular loop. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/li>\n<\/ol>\n

        7.<\/strong>\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define the term root mean square <\/em><\/strong>value of alternating current.\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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
        \n<\/span><\/p>\n

        (ii)\u00a0\u00a0\u00a0\u00a0Derive an expression for the average power dissipated in a resistor when an alternating current is passed through it.\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(03 marks)
        \n<\/span><\/p>\n

        (b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0What is meant by capacitive reactance<\/em><\/strong>?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0An alternating current is connected across a
        \n<\/span><\/p>\n

        capacitor of 16\u00b5F. Determine the maximum value of charge induced on each plate of the capacitor.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(04 marks)\u00a0\u00a0\u00a0\u00a0
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0(c)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Describe the structure and mode of operation of a repulsion type of a
        \n<\/span><\/p>\n

        hot iron ammeter.\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(05 marks)
        \n<\/span><\/p>\n

        (ii)\u00a0\u00a0\u00a0\u00a0Distinguish between a moving coil ammeter and a moving iron ammeter.\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(03 marks)
        \n<\/span><\/p>\n

        (d)\u00a0\u00a0\u00a0\u00a0A pure inductor having a self-inductance of 2.0 H, is connected in series with a resistor of resistance, 5.0 \u2126 and to an a.c. source of 240 V, 50 Hz. Calculate the root mean square value of current flowing in the circuit. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/p>\n

        \n\u00a0<\/p>\n

        \n\u00a0<\/p>\n

        \n\u00a0<\/p>\n

        \n\u00a0<\/p>\n

        SECTION D
        \n<\/strong><\/span><\/p>\n

        8.<\/strong>\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0What is an electric field?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(01 mark)
        \n<\/span><\/p>\n

        (ii)\u00a0\u00a0\u00a0\u00a0Sketch an electric field pattern due to two positive point charges Q1<\/sub><\/strong> and Q2<\/sub><\/strong>, placed a small distance apart and equidistant from a negatively charged metal plate, with Q2<\/sub><\/strong> having a larger charge than Q1<\/sub><\/strong>.
        \n<\/span><\/p>\n

        (03 marks)
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Explain the term corona discharge.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0Describe the structure and action of a Van \u2013 de \u2013 Graaff generator.
        \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\u00a0\u00a0\u00a0\u00a0(06 marks)
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0(c)\u00a0\u00a0\u00a0\u00a0Derive an expression for the electric potential at a point in an electric field.
        \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\u00a0\u00a0\u00a0\u00a0(04 marks)
        \n<\/span><\/p>\n

        (d)\u00a0\u00a0\u00a0\u00a0Sketch using the same axes, graphs of electric potential and electric field intensity against distance from the centre of a positively charged metal sphere.\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(03 marks)
        \n<\/span><\/p>\n

        \n\u00a0<\/p>\n

        9.\u00a0\u00a0\u00a0\u00a0<\/strong>(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Distinguish between dielectric field strength and dielectric constant.
        \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\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/p>\n

        (ii)\u00a0\u00a0\u00a0\u00a0Explain the effect of inserting a dielectric material to fill all the space between the plates of a parallel plate capacitor.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(04 marks)
        \n<\/span><\/p>\n

        (b)\u00a0\u00a0\u00a0\u00a0Four capacitors of equivalent capacitances of 6 \u00b5F are to be connected across a 12 V d.c. supply.
        \n<\/span><\/p>\n

        (i)\u00a0\u00a0\u00a0\u00a0Draw an arrangement that you would set up in order to provide the maximum capacitance in the circuit.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(02 marks)
        \n<\/span><\/p>\n

        (ii)\u00a0\u00a0\u00a0\u00a0Calculate the energy stored in the arrangement in (i) above.
        \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(03 marks)
        \n<\/span><\/p>\n

        (c)\u00a0\u00a0\u00a0\u00a0A fully charged capacitor is disconnected from the source and isolated in air. The space between its plates is then doubled while the other factors are kept constant. Explain the change in the energy stored in the capacitor as a result of doubling the distance between the plates.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/p>\n

        (d)\u00a0\u00a0\u00a0\u00a0A charged parallel plate capacitor with a plate separation, d<\/strong>, and area of overlap A<\/strong>, is filled with a dielectric material, of dielectric constant <\/span>
        \n\t\t\t\t<\/strong><\/span><\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0The dielectric has one third of it pulled out of the plates. Show that the capacitance, C<\/strong>, of the resultant capacitor is given by,<\/span>
        \n\t\t\t<\/span><\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0where, is the permittivity of free space or air.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/p>\n

        (e)\u00a0\u00a0\u00a0\u00a0State two industrial applications of capacitors.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(02 marks)\u00a0\u00a0\u00a0\u00a0
        \n<\/span><\/p>\n

        \n\u00a0<\/p>\n

        10.<\/strong>\u00a0\u00a0\u00a0\u00a0(a)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Define the term electrical resistance<\/em><\/strong> of a conductor.\u00a0\u00a0\u00a0\u00a0(01 mark)
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(ii)\u00a0\u00a0\u00a0\u00a0Explain the effect of increase in length on the resistance of a conductor.\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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0(b)\u00a0\u00a0\u00a0\u00a0(i)\u00a0\u00a0\u00a0\u00a0Derive the balance condition of a metre bridge.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(04 marks)
        \n<\/span><\/p>\n

        (ii)\u00a0\u00a0\u00a0\u00a0Describe the graphical method of the investigating the effect of the cross sectional area of a metal wire on its resistance,using a metre bridge.\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(06 marks)
        \n<\/span><\/p>\n

        (c)\u00a0\u00a0\u00a0\u00a0In figure 6, AB<\/strong> is a uniform resistance wire, 100 cm long and having a resistance of 4 \u2126. E1<\/sub><\/strong> is a driver cell of 2.00 V and internal resistance 1<\/strong>\u2126, while E2<\/sub><\/strong> is a source of e.m.f. of 1.50 V and internal, r<\/strong>.
        \n<\/span><\/p>\n

        \u00a0\u00a0\u00a0\u00a0\"\"\/\u00a0\u00a0\u00a0\u00a0
        \n\t\t\t<\/strong><\/span><\/p>\n

        When switch K1<\/sub> is closed while switch K2 <\/sub>is open, the centre zero galvanometer, G shows no deflection when the balance length, AC = 57.7 cm.
        \n<\/span><\/p>\n

        Determine the,
        \n<\/span><\/p>\n

          \n
        1. Internal resistance, r, of cell E2<\/sub>.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(03 marks)
          \n<\/span><\/li>\n
        2. Balance length AC, when both switches K1<\/sub> and K2<\/sub> are closed.\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(03 marks)
          \n<\/span><\/li>\n<\/ol>\n

          \n\u00a0<\/p>\n

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

          P510\/2 PHYSICS Paper 2 Nov\/Dec, 2020 2\u00bd hours \u00a0 \u00a0 JINJA JOINT EXAMINATIONS BOARD Uganda Advanced Certificate of Education MOCK<\/p>\n","protected":false},"author":1,"featured_media":323,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,1],"tags":[],"class_list":["post-212","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-physics","category-uncategorized"],"yoast_head":"\nUACE PHYSICS Paper 2 MOCK 2020 JINJA JOINT EXAMINATIONS BOARD - 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-2-mock-2020-jinja-joint-examinations-board\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UACE PHYSICS Paper 2 MOCK 2020 JINJA JOINT EXAMINATIONS BOARD - 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