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Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-9702-MP1-0011 markL1 FoundationCalculatorAcoustic impedance
Muscle has density 10801080 kg m⁻³ and speed of sound 15801580 m s⁻¹. Calculate its acoustic impedance, in units of 10610^6 kg m⁻² s⁻¹.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0031 markL1 FoundationCalculatorUltrasound imaging
An echo returns 6565 μs after the pulse is sent. The speed of ultrasound in tissue is 15401540 m s⁻¹. Calculate the depth of the boundary, in cm.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0041 markL1 FoundationCalculatorUltrasound imaging
A coupling gel is used in ultrasound scanning because
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0051 markL1 FoundationCalculatorUltrasound imaging
A piezoelectric crystal
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0101 markL1 FoundationCalculatorAcoustic impedance
The specific acoustic impedance of a medium is defined as
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0121 markL1 FoundationCalculatorUltrasound imaging
Ultrasound is sound with a frequency
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0022 marksL2 StandardCalculatorAcoustic impedance
Fat has Z=1.38×106Z=1.38\times10^6 and muscle has Z=1.71×106Z=1.71\times10^6 kg m⁻² s⁻¹. Calculate the percentage of ultrasound intensity reflected at a fat–muscle boundary.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0062 marksL2 StandardCalculatorUltrasound imaging
Ultrasound has an attenuation coefficient of 2323 m⁻¹ in a tissue. Calculate the fraction of intensity remaining after 4.04.0 cm.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0071 markL2 StandardCalculatorAcoustic impedance
At a boundary between two media with very different acoustic impedances
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0081 markL2 StandardCalculatorUltrasound imaging
Increasing the frequency of medical ultrasound
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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0091 markL2 StandardCalculatorAcoustic impedance
Air has Z=430Z=430 and skin has Z=1.7×106Z=1.7\times10^6 kg m⁻² s⁻¹. Calculate the percentage of intensity reflected at an air–skin boundary.

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Salam Academy Original Practice · Proposed mark scheme
SA-9702-MP1-0113 marksL3 ExamCalculatorUltrasound imaging
Ultrasound of intensity I0I_0 travels 3.03.0 cm through tissue (μ=23\mu=23 m⁻¹) to a boundary reflecting 1.1%1.1\%, then returns 3.03.0 cm. Calculate the returning intensity as a percentage of I0I_0.

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Salam Academy Original Practice · Proposed mark scheme