# Biophysics - Senses Test

20 Questions | Attempts: 205
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• 1.
If intensity of sound is increased 100times (100 people are talking all at once), then the intensity level of sound increases by
• A.

10 dB.

• B.

33 dB

• C.

66 dB

• D.

20 dB

• 2.
Central visual field:
• A.

Corresponds to the angle of 0? - 25? with the optical axis of an eye

• B.

Corresponds to the angle of 0? - 35? with the optical axis of an eye

• C.

Corresponds to the angle of 0? - 40? with the optical axis of an eye

• D.

Corresponds to the angle of 0? - 30? with the optical axis of an eye

• 3.
Visual sensitivity is defined as
• A.

Sensitivity (dB) = 10 x log (maximum intensity / set intensity

• B.

Sensitivity (dB) = 10 x ln (maximum intensity / set intensity

• C.

Sensitivity (dB) = 20 x log (maximum intensity / set intensity

• D.

Sensitivity (dB) = 20 x ln (maximum intensity / set intensity)

• 4.
Relative audiogram:
• A.

Expresses values of hearing improvement in decibels in comparison with the values of normal threshold of hearing

• B.

Expresses hearing loss in decibels in comparison with the values of normal threshold of hearing

• C.

Expresses hearing loss in watts per square meter in comparison with the values of normal threshold of hearing

• D.

Expresses hearing improvement in decibels in comparison with the values of normal threshold of hearing (0,5 kHz, 1 kHz, 2 kHz, 4 kHz, 8 kHz

• 5.
Perimetry is a method
• A.

For measuring distance between pupils of eyes

• B.

For examining visual field of eyes

• C.

For calculation of parameters of patient’s spectacles

• D.

For examination of accomodation abbility of lens

• 6.
Watt per square meter is the unit for
• A.

Intensity of sound

• B.

Intensity level of sound

• C.

Loudness

• D.

Loudness level

• E.

• 7.
Minimal angle of resolution (MAR) and visual acuity (V) are approx. in the relation:
• A.

V = 1/MAR

• B.

V = log MAR

• C.

Log V = - log MAR

• D.

MAR = log V

• 8.
Audiometer is an electroacoustic device which is constructed for:
• A.

Measuring an organ of hearing

• B.

Examination of function of organ of hearing

• C.

Pre-surgery measurement of an organ of hearing

• D.

Examination of middle ear functioning

• 9.
The most frequent audiometric examination is determination of thresholds of hearing for pure tones, which is conducted:
• A.

By air conduction as well as by conduction through middle ear.

• B.

By spatial conduction as well as by bone conduction

• C.

By air conduction as well as by body conduction

• D.

By air conduction as well as by bone conduction

• 10.
Normal hearing threshold for specific frequencies looks on a relative audiogram like
• A.

Vertical line

• B.

Horizontal line

• C.

Slanted at the angle of 45?

• 11.
For examining visual acuity e. g. Snellen’s optotypes are used, to more objective methods belongs:
• A.

Lagrange rings

• B.

Larousse rings

• C.

Legendre rings

• D.

Landolt rings

• 12.
Which of the series give frequencies that are one octave apart?
• A.

125 Hz, 250Hz, 500 Hz, 1000 Hz

• B.

100 Hz, 300 Hz, 900 Hz, 2700 Hz

• C.

50 Hz, 200 Hz, 800 Hz, 3200 Hz

• 13.
The unit for intensity level of a sound is
• A.

Son

• B.

Decibel

• C.

Watt per square meter

• D.

• 14.
The threshold audiogram has
• A.

Frequencies on the horizontal line

• B.

Intensity levels on the horizontal line

• C.

The horizontal line corresponds to the left ear

• 15.
The minimum separabile is used c also correct
• A.

For description of minimum distance of eyes

• B.

For determination of stereoscopic parallax

• C.

For description of angle resolution of eye

• D.

For design of glasses

• 16.
Minimal angle of resolution (MAR) and visual acuity (V) are approx. in the relation:
• A.

V = 1/MAR

• B.

V = log MAR

• C.

Log V = - log MAR

• D.

MAR = log V

• 17.
Velocity of the sound in air is 340 m/s. The vawelength of the harmonic tone of frequecy 1 kHz in air is
• A.

10 mm

• B.

34 mm

• C.

340 nm

• D.

1 mm

• E.

• 18.
Lens refraction capability is expressed by the physical quantity:
• A.

Called focal length

• B.

Called optical power

• C.

Called refractive index

• D.

• 19.
Punctum Remotum is
• A.

A point from which the eye can see sharply without accomodation

• B.

In finite distance for a normal eye

• C.

In infinite distance for a normal eye

• D.

A point from which an eye can see sharply at maximum accomodation

• 20.
Minimum separabile
• A.

Is basis of evaluation of color perception

• B.

Is basic resolution of colours

• C.

Equals 1 by human eye

• D.

Equals 5 by human eye

• E.

Is eye resolution limit

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