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GHS
S.5 PHYSICS PAPER 2
TIME:1HR
HOLIDAY WORK
aug 2012
1.(a)Define refractive index.
(1)
(b) (i) Describe how to determine the refractive index of a liquid using a
concave mirror.
(4)
(ii)Derive the expression used to obtain the refractive index in (i) above.
(4)
(c ) A glass prism of refractive angle 60o is immersed in a liquid of
refractive index 1.40.When light is incident on the prism at an angle of
32.4o,the angle of deviation is a minimum.
Find (i) the refractive index of the prism.
(ii)the angle of minimum deviation
(d) (i)Explain the terms critical angle and total internal reflection.
(ii)Give three applications of total internal reflection.
2.(a)Define a
(3)
(2)
(3)
(3)
(1)
(b)A capacitor consists of two concentric , conducting spheres. The of
radii of the inner and outer spheres are
respectively. The inner sphere
is given charge
and the outer sphere is earthed with air between them.
Derive an expression for the capacitance of the spheres.
Hence determine the capacitance if
.
(5)
(c) A parallel –plate capacitor has the space between the plates filled with
a slab of dielectric with constant
and one with dielectric with constant
, each of thickness , where is the plate separation. Show that the
capacitance
(4)
(d)A parallel plate capacitor consists of two plates of area
placed a distance
apart in air. The capacitor is charged so that
the potential difference between the plates is 1000V.
Calculate:
(i) the electric field between the plates.
(2)
(ii) the capacitance of the capacitor,
(1)
(iii) the energy stored in the capacitor.
(2)
(e) Describe an experiment to determine capacitance of a capacitor using
the vibrating reed switch method.
(5)