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BIOPHYSICS EXAM 10 QUESTION AND ANSWER
Which of the following is heavier than a proton? - Neutron What is the photoelectric effect? - Total energy transformation into an ejected electron
- Haigen -Pouiselle Law is: - Volume flow rate Q directly proportional to πr4 and pressure drop indirectly proportionally to liquid viscosity and tube length. Hooke's Law is - Elasticity of a medium Viscosity is - Internal Friction What are the units of grays per second - J.kg-1.s- The normal blood pressure is - 120mmHg/80mmHg What treatment can be given to a deep sea diver - Hyperbaric chamber and oxygen What is a colposcope used for? - Vagina and cervix uteri Brachytherapy is not used for tumours deep in the body because - the radiation deviates in all directions A patient with cochlear implants is not allowed in - MRI Which of the following are not methods of electrotherapy? - Electrophoresis
What kind of barrier is needed to separate the anode and cathode in a galvanic cell? - Semi- permeable What is the main function of the ciliary muscle? - Changing the curvature of the lens Which of the following can be used as an output device? - Earphones How do you measure bloodstream? - Doppler method What does 'D' stand for in an EKG? - Nothing. X-ray contrast agent - BaSO4, iodine, oxygen/CO Chromatic abberation - Caused by light dispersion Weber-Fechner's Law - Used in audiometry Kinematic viscosity depends on - Liquid density, temperature, dynamic viscosity Which particles are made of quarks? - Neutrons and protons Beer-Lambert's Law: - I = Io.10log-ecx (absorption spectrophotometry) Unsharpness of x-ray image can't induce - Beta rays and gamma rays Unit of Watts - Js-
Surface tension - Cannot explain the capillary elevation Scintillation counters cannot consist of a - Source of ionising radiation Doppler methods cannot be used for: - Study of brain activity High frequency ultrasound can be produced by - Piezoelectric transducers The P wave in the electrocardiogram (EKG) occurs during: - Atrial depolarisation Viscosity cannot be measured with - Piezoelectric viscometers We can hear - 0.1 W.m- Velocity of the sound depends on - Medium Hadrons are always the particles - Formed by combinations of quarks Physical half-life - Cannot be expressed by the equation Tp = Nλ Can be expressed by the equation Tp = 0.693/λ Photon energy cannot be expressed as - E = mgh or E = hλ What could not be used for measuring the concentration of different substances - Viscometry Dynamic viscosity is independent of - Liquid density
X-rays positive contrast agent cannot be - Protein suspension Thermistors are - Semiconductor components with thermal dependence of resistance Blood pressure - cannot be measured by the thermocouple, and it produces the Korotkoff's sounds Blood pressure cannot be measured by the - Ergometer and the Kropotkin method We cannot hear - -0.1 Wm- Spherical abberation is caused by - Thick lenses Refractometry - Is based on Snell's Law Dimension of the sound intensity is - Wm- Absorption coefficient depends on: - Solvent and wavelength What cannot be used for ultrasound imaging? - Hyperbolic and concave probes Acoustic impedance is independent of - Body temperature Chronaxy is - The time factor of the double value of the rheobase
Which principle states that electrons cant have the same quantum number at the same time? - Pauli's exclusion principle Temperature is always proportional to - Kinetic energy of electrons Toric lenses are used for - Mixed astigmatism What is correct during inspiration? - Plural pressure is lower than expiration pressure Xenon in lasers are used as? - Energy source If 10% is absorbed in spectrophotometry, what is the transmittance? - 90% Which probe is used during ultrasonography of the eye? - High frequency probe What is the Hounsfield unit of compact bone? - 1000 What is the Hounsfield unit of air? - - Formula for work done by the heart? - W = P x V Where are rod cells mostly found? - Yellow space How many dB is equal to 1 W/m-2? - 120 dB
DNA molecule breaking bonds are hard due to? - C-G What is the unit of Greys? - J.kg- Advantages of a scanning electron microscope over a transmission electron microscope? - TEM has better resoution What is the concentration after 9 hours of a radionuclide with half life of 3 hours? - 1/8 of initial concentration C-14 and N-14 are? - Isobars Which particles do not form colloids? - Glutamic acid Which of these does not use biosignals? - Pacemaker Which bonds form NaCl? - Ionic How many bytes are in the binary number of 1000 - 4 bytes Unit of candela indicates? - Intensity of light Whats the formula for the concentration gradient? - dc/dx What is the main problem of ESWL (Extracorporeal Shockwave Lithotripsy)? - Direction of waves What is the graphic relation of EKG? - Myocardiac voltage and time
The first source of energy in the galvanic cell is? - The reaction in the electrodes What is the best protection for neutron radiation? - Water If a substance presents 10 curies, it means? - 10 decays per second What is the biggest advantage of MRI? - The use of non-ionising radiation Heat transfer is only possible from one body to another if: - The bodies are of different temperatures Wavelength of UV radiation of electromagnetic spectrum: - Less than 400 nm Contrast agents in MRI - Gadolinium Gaseous microtubules are used as contrast agents for observation of: - None (can be used for observation of arterial blood pools) Audiogram is a graphic description of: - Loudness on frequency Which method cannot measure blood pressure? - Doppler method in children Which law is used for refraction? - Snell's Law Formula of an oscilloscope - U = Y.S or F = N/X.T Viscosity cannot be measured by - Calorimetry viscometer
Surface tension: - Cannot be expressed by the equation σ = F/l Kinematic viscosity is independent of: - Shape of the capillary Dimensions of the sound intensity is: - W.m- Fermions are always the particles with - Non integer spin number Scintillation counters must consist of a: - Photomultiplier and a photocathode
