IB DP Physics Mock Exam SL Paper 1B Set 3 - 2025 Syllabus
IB DP Physics Mock Exam SL Paper 1B Set 3
Prepare for the IB DP Physics Mock Exam SL Paper 1B Set 3 with our comprehensive mock exam set 3. 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
A fixed mass of an ideal gas is contained in a cylinder closed with a frictionless piston.
The volume of the gas is 2.5 × 10−3m3 when the temperature of the gas is 37°C and the
pressure of the gas is 4.0 × 105Pa.
(a) Calculate the number of gas particles in the cylinder. [2]
(b) Energy is now supplied to the gas and the piston moves to allow the gas to expand.
The temperature is held constant.
Discuss, for this process, the changes that occur in the
(i) density of the gas. [2]
(ii) internal energy of the gas. [2]
Answer/Explanation
Ans.
(a) Correct conversion of T: $\mathrm{T}=310 \mathrm{~K}$ seen $\checkmark$
” use of $N=\frac{p V}{k T}$ to get $» 2.3 \times 10^{23} \checkmark$
(b) (i) density decreases $\checkmark$
volume is increased AND mass/number of particles remains constant
(b) (ii) internal energy is constant
internal energy depends on kinetic energy/temperature “only”
OR