The student shines light on the LDR through a circular hole in a piece of black card,
as shown in the diagram.
The student repeats the experiment using cards with holes of different diameter.
The distance from the card to the LDR is always 5 cm.
The student varies the current in the circuit by adjusting the variable resistor.
(i) The independent variable in this experiment is
A the brightness of the light source
B the diameter of the hole
C the distance from the card to the LDR
D the resistance of the LDR
(ii) A controlled variable in this experiment is
A the current in the circuit
B the diameter of the hole
C the distance from the card to the LDR
D the resistance of the LDR
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Answer:
option b the diameter of the hole
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