Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 2
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12Section A: This section has 7 questions. Each question carries 10 marks (70 marks).
1.a. Complete the missing words by choosing the correct words from the list below:
created, diminished, destroyed, magnified, changed
The principle of conservation of energy states that energy can neither be _____________ nor
_____________, but can be _____________ from one form to another.
(3)
b.
The list below includes various forms of energy:
heat energy, electrical energy, sound energy, wind energy, light energy
Choose from the above list one form of energy for each of the following:
television
i.
energy input to the television,
________________________
ii.
useful energy output by the screen of the television, ________________________
iii.
useful energy output by the speakers of the television,________________________
iv.
energy wasted by the television.
________________________
(4)
c.
A television set uses 300 W of electrical power to produce 270 W of useful power. Calculate
the:
i.
power wasted by the television set,
___________________________________________________________________________
(1)
ii.
efficiency of the television set.
___________________________________________________________________________
(2)
2.
Matthew has four solid blocks of same size but of different materials as shown below. The
density of the material of each block is given in Table 1 below.
lead
redwood
copper
iron
a.
Calculate the:
3
3
i.
mass of the 20 cm
copper block in grams (g)
Material
Density ρ ρ ρ ρ in g/cm
copper
8.9
_____________________________________________(2)
ii.
mass of the copper block in kilograms (kg)
iron
7.9
_____________________________________________(1)
redwood
0.5
iii.
weight of the copper block.
lead
11.4
_____________________________________________(2)
Table 1
Physics – Secondary Schools – Track 2 - Form 5 – 2013
Page 2 of 12
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