IB DP Physics Mock Exam SL Paper 1B Set 5 - 2025 Syllabus
IB DP Physics Mock Exam SL Paper 1B Set 5
Prepare for the IB DP Physics Mock Exam SL Paper 1B Set 5 with our comprehensive mock exam set 5. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam
Question
Three identical light bulbs, X, Y and Z, each of resistance 4.0Ω are connected to a cell of emf 12 V. The cell has negligible internal resistance.
(a) The switch S is initially open. Calculate the total power dissipated in the circuit. [2]
(b) The switch is now closed.
(i) State, without calculation, why the current in the cell will increase. [1]
(ii) Deduce the ratio 
Answer/Explanation
Ans: a total resistance of circuit is 8.0 «Ω» P = \(\frac{12^2}{8.0}\) = 18 «W»
b i «a resistor is now connected in parallel» reducing the total resistance OR current through YZ unchanged and additional current flows through X
b ii