Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 4
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4.a. The figure represents a ray diagram for an
I
object O placed in front of a converging lens
RS. A ray of light from the top of the object O
O
is drawn to indicate the position of the image I.
i.
Draw another ray of light from the top of
the object O to show how the position of
the image I is formed.
(1)
S
ii.
Is the image real or virtual?
_____________________
(1)
iii.
Name one other property of the image
_____________________
(1)
iv.
The ray diagram shows the converging lens RS being used as a ___________________
(1)
Use the ray diagram (one square represents 1 cm) to determine the approximate:
b.
i.
object distance, u
____________________
(1)
ii.
height of the image, h
____________________
i
(1)
iii.
magnification of the converging lens RS
___________________________________________________________________________
(2)
iv.
focal length of the lens RS.
___________________
(2)
5.
The list below includes a set of electrical components that can form part of an electric circuit:
switch, diode, rheostat, light dependent resistor (LDR), thermistor, connecting wire
a.
State which component from the above list:
i.
is used to allow current to flow in one direction only,
_______________
ii.
causes a break in the circuit, stopping the current flow,
_______________
iii.
has a high resistance at low temperature,
_______________
iv.
has its resistance dependent on the light intensity.
_______________
(4)
b.
In the circuit diagram shown, calculate the:
12 V
• •
i.
total resistance of the circuit,
__________________________________________(2)
ii.
total current flowing through the circuit,
R
= 3 Ω Ω Ω Ω
R
= 3 Ω Ω Ω Ω
1
2
__________________________________________(2)
iii.
power P of the circuit.
___________________________________________________________________________
(2)
Physics – Secondary Schools – Track 2 - Form 5 – 2013
Page 4 of 12
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