Lesson 3.10

3.10 Medical physics: eye, ear, ECG, imaging and radionuclides Quiz: AQA Physics, Unit 10

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.10, Medical physics: eye, ear, ECG, imaging and radionuclides: 20 multiple choice questions for the AQA Physics (7408), Unit 10: Medical physics (A-level option), written with Revision Ninja.

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The 20 questions

  1. Which photoreceptor cells in the human retina provide detailed colour vision in bright light?

    • Ganglion cells
    • Bipolar cells
    • Cones
    • Rods

  2. What unit must focal length be expressed in when calculating lens power in dioptres?

    • Kilometres
    • Millimetres
    • Metres
    • Centimetres

  3. Which type of lens is used to correct myopia?

    • Cylindrical lens
    • Bifocal lens
    • Converging lens
    • Diverging lens

  4. Which type of lens is used to correct hypermetropia?

    • Converging lens
    • Diverging lens
    • Cylindrical lens
    • Concave lens

  5. A converging lens has focal length 0.25 m. What is its power?

    • -4.0 D
    • 0.25 D
    • 2.5 D
    • 4.0 D

  6. What is the image distance for an object 0.50 m from a 0.20 m focal length lens?

    • 0.30 m
    • 0.14 m
    • 0.33 m
    • 0.70 m

  7. A sound has an intensity of 1.0 x 10^-6 W m^-2. What is its intensity level, using I0 = 1.0 x 10^-12 W m^-2?

    • 6 dB
    • 120 dB
    • 0.6 dB
    • 60 dB

  8. By how much does the intensity level of a sound rise when its intensity doubles?

    • 2 dB
    • 6 dB
    • 10 dB
    • about 3 dB

  9. A sound is 30 dB louder than a reference sound. What is the ratio of their intensities?

    • 30
    • 10
    • 1000
    • 300

  10. Two tissues have acoustic impedances in the ratio Z1 = 1.5 and Z2 = 4.5 (arbitrary units). What fraction of intensity is reflected at the boundary?

    • 0.25
    • 0.75
    • 0.125
    • 0.50

  11. A soft tissue has density 1000 kg m^-3 and speed of ultrasound 1500 m s^-1. What is its acoustic impedance?

    • 1.5 x 10^9 kg m^-2 s^-1
    • 1.5 x 10^3 kg m^-2 s^-1
    • 6.7 x 10^-7 kg m^-2 s^-1
    • 1.5 x 10^6 kg m^-2 s^-1

  12. What electrical event in the heart is represented by the P wave on an ECG?

    • Atrial repolarisation
    • Atrial depolarisation
    • Ventricular depolarisation
    • Ventricular repolarisation

  13. Which part of a normal ECG corresponds to ventricular depolarisation?

    • the PR segment
    • the T wave
    • the P wave
    • the QRS complex

  14. For total internal reflection in an optical fibre, how must the core's refractive index compare to cladding?

    • Equal
    • Zero
    • Lower
    • Higher

  15. An X-ray tube operates at 80 kV. What is the maximum photon energy produced?

    • 160 keV
    • 80 keV
    • 40 keV
    • 8 keV

  16. A material has a linear attenuation coefficient of 0.50 per cm. What is its half-value thickness?

    • 1.4 cm
    • 0.35 cm
    • 2.0 cm
    • 0.69 cm

  17. A technetium-99m tracer has half-life 6 hours. What fraction of the activity remains after 18 hours?

    • one sixth
    • one eighth
    • one quarter
    • one half

  18. A radioisotope has a physical half-life of 8 days and a biological half-life of 12 days. What is its effective half-life?

    • 10 days
    • 2.4 days
    • 4.8 days
    • 20 days

  19. What does a photomultiplier tube convert light photons into within a gamma camera?

    • Gamma rays
    • Acoustic waves
    • Electrical signal
    • X-rays

  20. Which diagnostic imaging technique provides high soft-tissue contrast without using ionising radiation?

    • CT scan
    • MRI scan
    • X-ray scan
    • PET scan

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