CIE iGCSE Co-Ordinated Science P4.3.1 Circuit diagrams and circuit components Exam Style Questions Paper 2
Question
A student connects the circuit shown.
When the switch is closed, the fuse blows and stops the current.
What is a possible reason for this?
(A) The current rating of the fuse is too high.
(B) The current is too large.
(C) The lamp is too dim.
(D) The voltage is too small.
▶️Answer/Explanation
Ans: B
Question
A student measures the current in a resistor and the potential difference (p.d.) across it.
Which circuit shows an ammeter and a voltmeter both connected correctly?
▶️Answer/Explanation
Ans : A
Question
The series circuit shown includes a single component hidden in a box. The switch is open.
The switch is now closed and the lamp lights briefly before going off. The switch is now opened, and then closed again. This time the lamp does not light.
Which symbol represents the component in the box?
▶️Answer/Explanation
Answer: A
Explanation: The component is a capacitor. When the switch is closed, the capacitor charges and the lamp lights briefly. Once the capacitor is fully charged, no current flows, and the lamp goes off. When the switch is opened and closed again, the capacitor is already charged, so the lamp does not light.
Question
In the circuit, component X is used to control the brightness of the lamp.
What is component X?
A. an ammeter
B. a fixed resistor
C. a fuse
D. a variable resistor
▶️Answer/Explanation
Answer: D
Explanation: A variable resistor (rheostat) can control the brightness of a lamp by varying the resistance in the circuit, which changes the current flowing through the lamp. Ammeters measure current but don’t control it, fixed resistors provide constant resistance, and fuses are safety devices that don’t adjust brightness.