Biophysics Questions PDF
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University of Veterinary Medicine
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This document contains a set of biophysics questions, covering topics like radioactive counting, light interaction with the eye, and properties of liquids. The questions are presented without any context or further explanation.
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Biophysics questions 1. How does the absolute error of the result of radioactive counting change, if we measure it for 4 times longer with constant activity? - Doubles 2. Which is NOT an SI unit? - Speed - Weight 3. The stochastic biological effect is... - Heritable - In its case, the frequ...
Biophysics questions 1. How does the absolute error of the result of radioactive counting change, if we measure it for 4 times longer with constant activity? - Doubles 2. Which is NOT an SI unit? - Speed - Weight 3. The stochastic biological effect is... - Heritable - In its case, the frequency of the effect increases as the dose increases 4. Where does the direction of the light ray passing through the human eye change the most? - Entering the cornea 5. How does the volume velocity of a viscous liquid depend on the pressure difference? - Directly proportional to the pressure difference 6. Which statements are true? - If the sound source approaches the detector, the detected frequency is higher than the emitted frequency - If Stokes' law applies, the diffusion constant is inversely proportional to the viscosity of the medium 7. What isotopes are used to measure the dilution volume of blood? - 51Cr - 131I 8. Which statements are true? - The transmission speed of higher sounds is lower than that of deeper sounds - Mediated diffusion is faster than simple diffusion 9. The decay constant of a radioactive isotope with a half-life of 1 second is approximately: - 0,7/s 10. What kind of EEG waves does the resting brain emit? - Alpha 11. A biconcave lens is a diverging lens,... - If the refractive index of the lens is greater than the refractive index of the medium 12. In which imaging equipment does the absorption caused by the skull impair the resolution of the images of the brain? - CT 13. The Laplace law states: - In the wall of a pipe with a circular cross-section, the tension created by the pressure in the pipe 14. How does blood pressure change in the brain of a person who stands up suddenly? - Decreases 15. If everything else remains the same, how does the volume velocity of the laminar blood flowing in the tube change in the event of a 19% increase in the radius of a blood vessel? - Doubles in size (about) 16. Which imaging procedure uses ionizing radiation to create the image? - CT - PET 17. Which statement is correct? - The dark-adapted eye is the most sensitive 18. When do two meeting light waves cause permanently observable interference? - If they are coherent - If their phase difference is constant 19. Which quantities SI unit is 1/s? - Frequency - Decay constant 20. The Korotkoff noise… - Occurs when the pressure of the air bag is already lower than that created by the heart’s peak pressure 21. If a truly upright object is located within the focal length of the diverging lens, the image is... - Virtual - Erect 22. With the same transmitted energy, which ionizing radiation has the greatest biological effect? - 3 MeV energy alpha radiation 23. In ultracentrifugation, if everything else remains the same... - The lower the frictional coefficient, the faster the movement - The smaller the diffusion constant, the slower the movement 24. In positron beta decay… - The atomic number increases by one - The mass number does not change 25. The effective half-life of a radioactive isotope introduced into the body... - Less than its biological half-life - It is equal to the reciprocal of the sum of the reciprocals of the two half-lives 26. Which of the following statements is NOT true? Alpha particles are… - Protons - High energy photons 27. The amplitude of which EEG wave falls in the range of 50 - 100 µV? - Delta 28. After twenty minutes, what percentage of the isotope 13N with a half-life of 10 minutes has already decayed? - 75 29. After 40 minutes, what % of the 14-N isotope with a half-life of 10 minutes has not yet decayed? - 6.25 30. Refractive index of a lens system consisting of two thin lenses in contact with each other is… - The sum of the refractive index of the two lenses 31. Activity of a radioactive source is… - The number of radioactive decays per second 32. Stokes' law gives… - The magnitude of the medium resistance force acting on a spherical body moving in a viscous liquid 33. Which imaging procedure does NOT use electromagnetic radiation to create the image? - Echoencephalography 34. The SI unit of which quantity is kg/ms? - Viscosity 35. What does the degree of refraction at the boundary of two media depend on? - The density of the two media - The relative refractive index of the second medium to the first medium 36. What happens when two light waves meet? - Their evasions add up 37. If a virtual and erect object is outside the focal length of the converging lens, the image is... - Virtual and inverted 38. Frequency used for field diathermy of the coil is… - 0.03 GHz 39. Ultrasound frequency band used in medical applications: - 2 - 18 MHz 40. How does the pressure of an ideal fluid flowing in a pipe change if the diameter of the pipe increases? - Increases 41. How does the pressure of an ideal fluid flowing in a pipe change if the diameter of the pipe decreases? - Decreases 42. What does the diffusion constant D depend on? - The shape of the diffusing particle - The temperature 43. Which imaging equipment is able to demarcate cancerous tumors most accurately? - The MRI 44. Braking radiation’s… - Performance depends on the accelerating voltage 45. The patch-clamp technique… - Greatly narrows the surface of the membrane to be tested 46. Which EEG wave has a frequency between 4 Hz and 7 Hz? - Teta 47. Which infusion solution causes hemolysis? - The hypotonic 48. The magnitude of the peak of the QRS complex of the two-lead ECG signal: - 1-2 mV 49. Lambert's law states: - The decrease in the intensity of the light passing through the material depends on the thickness of the material 50. Where is the blood pressure of a standing person the highest? - In the heart 51. How does the volume velocity of a viscous liquid depend on the viscosity? - Inversely proportional to viscosity 52. What is the concentration of Na in the isotonic NaCl salt solution? - 0.9% 53. Amount of the effective dose - J/kg 54. Which quantity decreases as the number of measurements increases? - The error of the average 55. Which is NOT a basic SI quantity? - The speed of light in a vacuum - The weight 56. Which unit is NOT an official SI unit? - firm - eV 57. Which statement is FALSE? - The dark-adapted state develops within minutes after moving from a light to a dark room 58. A small cat weighing 2 kg sits on a wall 1 m high and then runs on the ground at a speed of 4 m/s. When is its mechanical energy greater? - When sitting on the wall 59. Which of the following statements are true? - The transmission capacity of higher sounds is lower than that of deeper sounds - Thermography poses no danger to the fetus 60. After one hour, what percentage of the inhaled 11C isotope with a half-life of 20 minutes has not yet decayed? - 12.5% 61. Which statements are true? - The diffusion constant is proportional to the mass of the diffusing particle - The diffusion constant increases when the temperature rises 62. Which unit is NOT an official SI unit? - rad - keV 63. After forty minutes, what percentage of the 13N isotope with a half-life of 10 minutes has not yet decayed? - 6.25% 64. If an electron is accelerated in a vacuum with a 1.5 V pencil cell, approximately what will its wavelength be? - 1 sqm 65. When do two meeting light waves cause permanently observable interference? - If they are coherent - If their phase difference is constant 66. The SI unit of which quantity is the second? - Period time - Sedimentation coefficient 67. What is the usual activity of the 131I source used in thyroid examinations? - 0.4 MBq 68. Which of the following statements are true? Beta particles are… - Positrons - Electrons 69. The voltage-clamp technique - Keeps the membrane voltage at the pre-set artificial value 70. The maximum amplitude of which EEG wave is less than 20µV? - Beta 71. Absolute error of the difference of two quantities with error is… - The square root subtracted from the sum of the squares of the two absolute errors 72. The radioactive decay constant is… - Inversely proportional to half-life 73. The frequency used for the microwave diaterminal: - 2540 MHz 74. Which infusion solution causes plasmolysis? - The hypertonic 75. Which of the following statements are FALSE? Beta particles are... - Hydrogen nuclei - High energy photons 76. SI unit of radiation dose: - C/kg 77. The frequency used for condenser space diathermy: - 0.03 GHz 78. If a real object is located within the focal length of the converging lens it is… - Straight and virtual 79. What does the diffusion constant D NOT depend on? - The density of the medium - The pH value of the medium 80. Which of the following statements are true? Alpha particles are... - Doubly ionized He atoms - He nuclei 81. Which of the following statements are true? - The penetrating ability of higher sounds is lower than that of low sounds - Mediated diffusion is faster than simple diffusion 82. What does the degree of refraction at the boundary of two media depend on? - The density of two media 83. Wavelength of an electron in a vacuum: - 0.3 µm 84. Which statement is FALSE? - The visual acuity of the light-adapted eye is poor - The light-adapted eye is the most sensitive Which statement about Bremsstrahlung is true? - Its power depends on the acceleration voltage The dimension of impulse is… - kg x m/s The light atomic nucleus is about... - 10-15 meters big How is the performance defined? - Energy/time A half radian is... - Approximately 28.672° Beta radiation... - Has a continuous spectrum with maximum energy Properties of the mesophases... - Anisotropy Applies to the sine function... - sin(t) is the same sin(t+2*pi) - sin(a+pi) is the same sin(a) Remain after three times the half-life… - 12.5% the kernels Lambert-Bert's law applies to... - Light reflection for thin solutions One type of torque is... - Bending - Twist A thermodynamically isolated system is... - A system with an exchange of energy and matter In mechanical equilibrium what adds up? - All the forces Isotherm thermodynamic is when... - The temperature is constant Ionization is when electrons are... - Freely dispersed A bird is 1 kg and flies with 36 km per hour. What is the kinetic energy? - 50 J Which dimension corresponds to sound? - Ground frequency Elementary process of attenuation of x-rays: - Photoeffect - Pair formation - Compton scattering Abbe theory is valid for... - Light refraction Extensive dimensions are... - Additive - Mass and volume Ionized radiations are… - Beta radiating - Gamma radiating Lens error are… - Chromatic aberration - Spherical aberration Range of beta radiation: - In the air 10 cm ~ a few meters - In soft tissue a few mm Boltzmann distribution does NOT describe: - Effective half-time - Bound state of electrons Transport of heat processes are... - Conduction - Convection