Biophysics Sample test (1. LF UK)

Below you can try a sample credit test for biophysics:

1 Blood pressure of 160 mmHg:

	is referred to as mean pressure
	is considered pathological
	is the normal physiological value of systolic pressure
	is the normal physiological value of diastolic pressure

2 The digital tonometer is based on:

	oscillometric principle
	on changes in the resistance of the strain gauge wire
	on changes in the capacity of the strain gauge wire
	none of the above options are correct

3 Where will the speed of sound be the highest?

	in air at a temperature of 0°C
	in water at a temperature of 0°C
	in air at a temperature of 20°C
	in steel

4 Sample activity

	grows linearly with time
	decreases exponentially with time
	decreases linearly with time
	grows exponentially with time

5 What are the units of absorbed dose?

	Gy
	Bq
	J.kg-1
	this quantity is dimensionless

6 A laser device is a current of:

	photons
	electrons
	positrons
	helium nuclei

7 Reynolds number

	gives the critical speed in [m.s-1]
	is a quantity with the sign R
	determines the limit value when turbulent flow turns into laminar flow
	depends only on the viscosity and speed of the liquid and on the lumen of the vessel

8 Hypoxic tissue:

	sensitivity to radiotherapy does not depend on oxygen content
	is radioresistant
	is radiosensitive
	has a normal sensitivity to radiotherapy

9 Positive contrast agents:

	absorb radiation more than the examined organ
	on the X-ray image they cause a saturated shadow
	cause clarification on the X-ray image
	are substances with low absorption capacity

10 Betatron uses the acceleration principle

	positrons and electrons
	protons and neutrons
	electrons
	heavy charged particles

11 The rheobase is:

	current frequency that is needed for irritation
	current value at which tissue damage occurs
	the highest current that can still be used safely
	the smallest current that causes irritation

12 Bipolar limb lead II:

	connects right leg and right hand
	connects left arm and left leg
	connects right leg and left hand
	connects right arm and left leg

13 Applies to the audiogram:

	is used to record audiometry results
	has a curve for the right and left ear separately
	the pain threshold is recorded in it
	the curve that is marked in the audiogram is called an isophone

14 Where does periosteal pain occur?

	at the interface of soft tissue and bone
	at the interface of two soft tissues
	at the interface of two tissues with similar bioimpedance to ultrasound
	anywhere in the organism that is affected by ultrasound

15 Cannot be measured by spirometry

	resting tidal volume
	vital capacity
	residual volume
	inspiratory capacity

16 Effective half time

	is always shorter than the biological half-life
	is always longer than the biological half-life
	is longer in real conditions than in physical conditions
	does not match any of the above definitions

17 Quantum physics attributes to microworld objects:

	particle and wave character
	only wave character
	only particle character
	none of the listed options

18 What electrical properties does the cell membrane have if a high current passes through the tissues? frequencies?

	the current flows only through the extracellular space
	for electric current becomes through
	represents an infinite resistance to electric current
	bioimpedance is proportional to the weight of the extracellular fluid

19 Doppler effect in sonography enables:

	distance measurement
	measurement of acoustic resistance
	detection of speed and direction of flow
	measurement of tissue echogenicity

20 Applies to wavelength

	λ = c.f
	λ = c/f
	λ = f/c
	λ = 1/f

21 The cones are in different areas of the retina:

	of the same shape
	same shape but different core
	of different shape and do not have a nucleus on the periphery of the retina
	different shape

22 Astigmatism is corrected:

	distractions
	toric glasses
	couplings
	bifocal glasses

23 Low power laser can damage

	internal organs
	the skin
	mucous membrane
	sight

24 Close point

	is the closest point that the eye can see sharply with maximum accommodation
	moves away from the eye with increasing age
	is the closest point that the eye can see clearly without accommodation
	gets closer to the eye with increasing age

25 For X-ray imaging methods, we use:

	of the current of electrons emitted from the cathode and accelerated by the high voltage between the cathode and the anode
	fluorescence, which is caused by a stream of electrons after passing through the examined object
	braking radiation caused by the impact of a current of positively charged electrons emitted from the anode and accelerated by the high voltage between the cathode and the anode
	beta-radiation emitted by cobalt emitters

26 State quantities do not include:

	pressure
	internal energy
	work
	temperature

27 Indicate the correct unit of the Boltzmann constant

	J
	J.K-1
	J.K
	J.K. kg

28 Brassoid X-rays:

	has a continuous spectrum
	can have a continuous or line spectrum
	is created by the transition of electrons on the levels
	no answer is correct

29 The Doppler effect does not occur

	in a situation where the transmitter and receiver move at the same speed in different directions
	in a situation where the transmitter and receiver are at rest
	in a situation where the transmitter and receiver are moving at the same speed in the same directions
	no answer is correct