CIE iGCSE Co-Ordinated Science P4.2.4 Resistance Exam Style Questions Paper 2
Question
The current–voltage characteristic for a filament lamp is shown.
As the current increases, what happens to the temperature of the lamp filament and what happens to the resistance of the lamp filament?
As the current increases, what happens to the temperature of the lamp filament and what happens to the resistance of the lamp filament?
▶️Answer/Explanation
Ans : D
Question
A 12Ω resistor is connected in parallel with a 6.0Ω resistor.
What is the combined resistance of the two resistors?
(A) 0.25Ω
(B) 4.0Ω
(C) 9.0Ω
(D) 18Ω
▶️Answer/Explanation
Ans : B
Question
The graph shows how the resistance of a thermistor changes with temperature.
There is a potential difference (p.d.) of 6.0V across the thermistor.
What is the current in the thermistor when it is at a temperature of 50 °C?
(A) 0.0020A (B) 0.50A (C) 2.0A (D) 500A
▶️Answer/Explanation
Ans: A
Question
The diagram shows a wire of length l and diameter d.
Which pair of changes must increase the resistance of the wire?
(A) decreasing l and decreasing d
(B) decreasing l and increasing d
(C) increasing l and decreasing d
(D) increasing l and increasing d
▶Answer/Explanation
Ans :C