Biophysique Preparation (Mr. Chhoeurt Koeurn)

/30

1 / 30

1) How do hair cells convert mechanical vibrations into neural signals?

a. . By creating turbulence in the fluid

b. . By moving ossicles

c. . Through hormone secretion

d. . By opening ion channels on stereocilia

e. . By reflecting sound

2 / 30

2) Where are sound vibrations converted into electrical signals?

a. . Auditory Nerve

b. . Eardrum

c. . Cochlea

d. . Ear Canal

e. . Pinna

3 / 30

3) In which frequency range is the ear most sensitive, having the widest dynamic range?

a. . 1–2 kHz

b. . 100–500 Hz

c. . Above 10 kHz

d. . 20–50 Hz

e. . 5–8 kHz

4 / 30

4) Why is volume flow rate important in the respiratory system?

a. . It determines how much oxygen enters the blood

b. . It controls your breath

c. . It produces energy directly

d. . It maintains body temperature

e. . It controls your heartbeat

5 / 30

5) Which principle explains how different frequencies affect different parts of the cochlea?

a. . Hooke’s law

b. . Laplace’s law

c. . Tonotopic organization

d. . Poiseuille's law

e. . Bernoulli principle

6 / 30

6) How do spiders primarily detect sounds?

a. . Through eardrums like humans

b. . Using antennae

c. . By hearing with their eyes

d. . Through their webs acting like ears

e. . Using specialized sensory hairs called trichobothria

7 / 30

7) What happens to the dynamic range at very low or very high frequencies?

a. . It narrows

b. . It becomes infinite

c. . It becomes negative

d. . It remains unchanged

e. . It increases

8 / 30

8) Why does ear pressure often occur during altitude changes?

a. . Blockage from earwax

b. . Inner ear swelling

c. . Unequal pressure between the middle ear and the outside environment

d. . Fluid buildup behind the eardrum

e. . Cold air entering the ear canal

9 / 30

9) Which organs are most affected if blood flow rate drops too low?

a. . Lungs and Spinal cord

b. . Bones and cartilage

c. . Brain and heart

d. . Skin and muscles

e. . Hair and nails

10 / 30

10) What can happen if the volume flow rate of blood or air is too low?

a. . Stronger muscles

b. . Oxygen shortage in tissues

c. . weaker muscles

d. . Improved digestion

e. . Higher blood sugar levels

11 / 30

11) What is the main biophysical role of the ossicles in hearing?

a. . Convert sound waves into electrical signals

b. . Transmit sound directly to the brain

c. . Detect high-frequency sound

d. . Amplify mechanical vibrations from the eardrum to the inner ear

e. . Equalize air pressure

12 / 30

12) What happens when the pressure inside the middle ear is lower than the external air pressure?

a. . Eardrum is pulled inward

b. . Eardrum pushes outward

c. . No effect unless temperature changes

d. . Eardrum ruptures immediately

e. . Hearing improves

13 / 30

13) What does a sound intensity of 120-130 dB correspond to?

a. . Soft whisper

b. . Whisper

c. . Silence

d. . Normal conversation

e. . Threshold of pain (very loud)

14 / 30

14) Which of the following is not true about sound waves?

a. . They can travel in a vacuum

b. . They are longitudinal in air

c. . They carry mass of particles

d. . They need a medium to travel

e. . They are mechanical waves

15 / 30

15) What does the volume flow rate (Q) measure?

a. . The volume of fluid passing through a point per unit time

b. . The area of flow per volume

c. . The weight of fluid per time

d. . The area of flow per unit time

e. . The speed of a moving object

16 / 30

16) What is the approximate dynamic range of the human ear in the 1–2 kHz frequency range?

a. . 20–200 dB

b. . 0–120 to 130 dB

c. . 0–80 dB

d. . 10–50 dB

e. . 0–100 dB

17 / 30

17) In laminar flow, how does vessel radius affect flow rate?

a. . Flow rate decreases linearly with radius

b. . Flow rate is proportional to the fourth power of radius

c. . Flow rate is directly proportional to radius

d. . It has no effect

e. . Flow rate is proportional to the square of radius

18 / 30

18) What type of wave is sound when traveling through air?

a. . Electromagnetic wave

b. . Longitudinal wave

c. . Sound wave

d. . Transverse wave

e. . Light wave

19 / 30

19) What does “dynamic range” in human hearing refer to?

a. . Bone conduction capacity

b. . Auditory nerve firing rate

c. . Range of hair cell movement

d. . Frequency range of hearing

e. . Loudness range between threshold and pain

20 / 30

20) What is the primary function of the cochlear hair cells?

a. . To generate pressure waves

b. . To protect the eardrum

c. . To produce perilymph

d. . To move the ossicles

e. . To convert mechanical vibrations into electrical signals

21 / 30

21) What is the role of the ossicles (malleus, incus, stapes)?

a. . They convert sound into chemical energy.

b. . They amplify and transmit vibrations to the inner ear.

c. . They detect electrical signals.

d. . They carry signal out from the brain

e. . They carry sound directly to the brain.

22 / 30

22) What part of the ear captures sound from the environment?

a. . Ear canal

b. . Pinna (Outer Ear)

c. . Auditory Nerve

d. . Eardrum

e. . Cochlea

23 / 30

23) Why does the flow rate increase more slowly in turbulent flow compared to laminar flow?

a. . Because turbulent flow causes vessel dilation

b. . Because turbulent flow eliminates resistance

c. . Because flow rate in turbulence is proportional to the square of pressure gradient

d. . Because blood viscosity is reduced in turbulence

e. . Because flow rate in turbulence is proportional to the square root of pressure gradient

24 / 30

24) Where in the ear does the amplification of sound primarily occur?

a. . Pinna

b. . Outer ear (pinna)

c. . Auditory nerve

d. . Inner ear (cochlea)

e. . Middle ear (ossicles)

25 / 30

25) What is the term for the volume flow rate of blood pumped by the heart?

a. . Blood pressure

b. . Tidal volume

c. . Cardiac output

d. . Stroke rate

e. . Air Volume

26 / 30

26) Which part of the ear sends sound information to the brain?

a. . Auditory Nerve

b. . Ossicles

c. . Pinna

d. . Ear Canal

e. . Cochlea

27 / 30

27) The function of outer hair cells in the cochlea is to

a. . Produce earwax

b. . Amplify and fine-tune mechanical vibrations

c. . Transmit signals to the auditory cortex

d. . Detect high-frequency tones only

e. . Convert electrical signals into mechanical motion

28 / 30

28) Why do hair cells fail to recover after damage?

a. . They are protected by immune cells

b. . They are post-mitotic and do not regenerate

c. . They regenerate slowly over time

d. . They are replaced by fluid

e. . They only respond to low frequencies

29 / 30

29) What is the correct order of how sound travels through the ear?

a. . Ear Canal → Cochlea → Ossicles → Eardrum → Brain

b. . Ear Canal → Cochlea → Ossicles → Eardrum → Auditory Nerve

c. . Ear Canal → Eardrum → Ossicles → Cochlea → Auditory Nerve

d. . Cochlea → Eardrum → Ossicles → Auditory Nerve

e. . Eardrum → Cochlea → Ossicles → Auditory Nerve

30 / 30

30) What is the role of the basilar membrane in hearing?

a. . To vibrate in response to fluid movement and stimulate hair cells

b. . To amplify sound using ossicle action

c. . To convert sound waves directly into nerve impulses

d. . To protect the cochlea from excessive fluid pressure

e. . To equalize air pressure in the inner ear

Your score is

The average score is 0%

Any comments?

Any problems/errors or mistakes found while testing, please let us know for modification!

និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត