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Bolyai Institute
Department of Medical Physics and Medical Informatics
Department of Mathematics and Informatics,UNS PMF
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Physics test
Interactive Tests in Medical Physics
Anthropometry (Laboratory practical)
1/1. The range of normal BMI values is:
18.5-24.99
<16
>40
9.5-13.99
32-43.99
Clench force (Laboratory practical)
2/1. When measuring clench force with a manual dynamometer and exerting maximum clench force for a given time period, ...
we do work in the biological sense but not in the physical sense.
we do work in the physical sense but not in the biological sense.
we do work both in the physical sense and in the biological sense.
we do not do work either in the physical sense or in the biological sense.
it depends on the magnitude of the clench force whether we do physical work or not.
Electromyography (Laboratory practical)
3/1. The electro-miography (EMG)...
is the recording of changes in skin voltage produced by underlying skeletal muscle constriction.
is the recording of changes in skin voltage produced by heart function.
is the recording of action potential of the nerves.
is the Fourier-transform of acoustic signals.
is the monitoring of signals derived from blood pressure measurements.
Acoustics (Laboratory practical)
4/1. The sound level for pain threshold is about:
120 dB
0 dB
1 dB
10^-12 dB
10 dB
Blood pressure measurement (Laboratory practical)
5/1. Which mechanisms are involved in the generation of Korotkov sounds?
cavitation, heart sounds, noise
wall detachment, turbulent blood flow, cavitation
turbulent blood flow, noise, heart sounds
heart sounds, turbulent blood flow, cavitation
noise, heart sounds, wall detachment
SI: SI units and prefixes.
6/1. Which unit does NOT mean energy?
1 J
2 N∙m
3 V∙A∙s
4 Ω∙A
4 kg∙m^-2∙s^-2
Calculation 1
7/1. A stone is thrown up with initial speed of 19.5 m/s from 0 level. What is the highest point of its path? (g = 10 m/s^2)
4,9 m
9,8 m
19,0 m
38,8 m
none
Calculation 2
8/1. Three branches meet in a junction of a circuit. If 10 mA flows into the junction from the first branch and 20 mA flows out of the junction into the second branch, what is the magnitude and direction of the current in the third branch?
10 mA, into the junction
30 mA, into the junction
10 mA, out of the junction
30 mA, out of the junction
no current flows
Motion
9/1. The vector "-A" is:
greater than A in magnitude
less than A in magnitude
in the same direction as A
in the direction opposite to A
perpendicular to A
Force, work, power
10/1. A high diver jumps from a height of 10 m. If the air resistance is negligible, during the fall the following quantity will decrease: the diver's...
gravitational potential energy.
total mechanical energy.
kinetic energy.
speed.
linear momentum.
Vibrations
11/1. How can we obtain the angular frequency of an object oscillating on a spring?
the square root of the ratio of the spring constant to the mass
the ratio of the spring constant to the mass
the product of the spring constant and the mass
the square root of the ratio of Botzmann's constant to the mass
the square root of the product of Botzmann's constant and the mass
Optics
12/1. Which of the following statements is CORRECT?
Temperature
13/1. Which is the most important heat transport process by which the human body gives off heat at room temperature?
radiation
convection
conduction
perspiration (via breathing)
perspiration through skin
Flow
14/1. According to the Bernoulli’s law,...
the sum of the static, dynamic and hydrostatic pressures is constant in a tube.
the vectorial product of the velocity and the area of cross-section is constant.
the ratio of the velocity and the area of cross-section is constant.
the hydrostatic pressure is equal to the dynamic pressure.
the product of the area of cross-section and the density is constant.
Diffusion
15/1. Which one of the following statements is CORRECT?
The larger the mass of a particle is, the smaller is the rate of the diffusion.
At lower temperature the diffusion coefficient is higher.
The diffusion coefficient is independent of the radius of the particle.
The rate of the diffusion is higher if the viscosity of the solution is higher.
The rate of the diffusion is independent of the viscosity of the solution.
Thermodynamics
16/1. Complete the following sentence! „Thermodynamics, in the classical sense, is dealing with…”
volume change processes.
decreasing the pressure processes.
increasing temperature processes.
heat exchange processes.
concentration change processes.
Bioelectricity
17/1. The electric field within an enclosure formed by conducting material...
is zero, according to the Faraday-cage principle.
only depends on the total charge within the enclosure, according to Coulomb’s law.
is infinite.
changes in a harmonic fashion with time.
is circularly symmetric due to the Lorentzian force.
Electricity and magnetism
18/1. The total resistance of the resistors in series is...
the sum of the individual resistances.
the reciprocal value of the sum of the reciprocals of the individual resistances.
the vectorial sum of the individual resistances.
the product of the individual resistances.
the difference of the individual resistances.
Signal processing
19/1. What is the sampling rate required for the proper reconstruction of a signal from its sample sequence?
at least twice in a period
at least four times in a period
the frequency of the fastest signal component
at least twice the frequency of the fastest signal component
the frequency of the slowest signal component
Waves
20/1. From Doppler's law it follows that...
if the source of a sound approaches to the resting receiver, the observed frequency is lower than that of the source.
if the source of a sound moves away from the resting receiver, the observed frequency is higher than that of the source.
the frequency shift depends on the ratio of the speed of source to the speed of sound in the medium.
the observed frequency is independent of the relative speed of the source and the observer.
the frequency shift depends on the product of the speed of source and the speed of sound in the medium.
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