Biophysics Quiz m

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Questions and Answers

How does the absolute error of the radioactive counting result change if it is measured for four times as long at essentially constant activity?

Halved

Does not change

Reduced to a quarter

Doubles in size (correct)

Which quantity is not an SI base unit?

Speed (correct)

Luminous intensity

Weight (correct)

Temperature

The stochastic biological effect is...

In its case, with increasing dose, the frequency of action increases (correct)

For it to occur, the dose must be greater than a threshold

Its threshold dose strongly depends on the type of ionizing radiation

Inheritable (correct)

Where does the direction of the light beam passing through the human eye change the most?

At entry into the cornea Signup and view all the answers

How does the volumetric velocity of a viscous liquid depend on the pressure difference?

Directly proportional to the pressure difference Signup and view all the answers

Which statements are true?

If the sound source approaches the detector, the detected frequency is greater than the emitted frequency Signup and view all the answers

What isotopes are used to measure blood dilution volume?

131I Signup and view all the answers

Which of the following statements are true?

Mediated diffusion is faster than simple diffusion Signup and view all the answers

The decay constant of a radioactive isotope with a half-life of 1 second is approximately:

0.7/s Signup and view all the answers

What EEG waves does a resting brain emit?

Alpha Signup and view all the answers

A biconcave lens is then a spray lens, ...

If the refractive index of the lens is greater than the refractive index of the medium Signup and view all the answers

Which imaging equipment significantly worsens the resolution of brain images due to absorption from the skull bone?

CT Signup and view all the answers

The Laplace Law gives...

The tension created by the pressure in the pipe in the wall of a circular pipe Signup and view all the answers

How does blood pressure change in the brain of a person who suddenly stands up?

Decrease Signup and view all the answers

All else being equal, how does the volume rate of blood flowing laminally through the tube change if the radius of a vessel increases by 19%?

Doubles Signup and view all the answers

Which imaging method uses ionizing radiation to create the image?

A PET Signup and view all the answers

Which statement is correct?

The dark adapted eye is the most sensitive Signup and view all the answers

When do two light waves that meet each other cause persistent interference?

If their phase difference is constant Signup and view all the answers

The SI unit of which quantity is 1/s?

The decay constant Signup and view all the answers

The Korotkoff noise...

It occurs when the pressure in the air sac is already less than the peak pressure generated by the heart Signup and view all the answers

If a truly upright object is located within the focal length of the diverging lens, the image...

Virtual and erect Signup and view all the answers

Which ionizing radiation has the greatest biological effect for the same energy transferred? (3 MeV energy)

Alpha radiation Signup and view all the answers

In ultracentrifugation, if everything else remains the same…

The smaller the diffusion constant, the slower the movement Signup and view all the answers

In positron beta decay...

The mass number does not change Signup and view all the answers

The effective half-life of a radioactive isotope administered to the body is...

Less than its biological half-life Signup and view all the answers

Which of the following statements are NOT true? Alpha particles...

High-energy photons Signup and view all the answers

Which EEG wave amplitude falls in the range of 50 - 100 µV?

Delta Signup and view all the answers

After twenty minutes, what percentage of the 10-minute half-life isotope 13N introduced into the body has already decayed?

75 Signup and view all the answers

After 40 minutes, what % of the isotope 14N with a half-life of 10 minutes has not decayed?

6,25 Signup and view all the answers

Refractive power of a lens system consisting of two thin lenses in contact with each other is...

Sum of the refractive power of the two lenses Signup and view all the answers

Activity of a radioactive source is...

Number of radioactive decays per second Signup and view all the answers

The Stokes’ law gives...

The magnitude of the medium resistance force acting on a spherical body moving in a viscous liquid Signup and view all the answers

Which imaging method does NOT use electromagnetic radiation to create the image?

Echoencephalography Signup and view all the answers

What determines the degree of refraction at the border of two media?

From the density of the two media Signup and view all the answers

When two light waves meet, what happens?

Their evasions add up Signup and view all the answers

If a real and erect object is outside the focal length of the collector lens, the image...

Real and reverse Signup and view all the answers

Frequency used for field diathermy of the coil is...

0.03 GHz Signup and view all the answers

Ultrasound frequency band used in medical applications is...

2- 18 MHz Signup and view all the answers

How does the pressure of an ideal fluid flowing in a pipe change when the diameter of the pipe increases?

Increases Signup and view all the answers

What does the diffusion constant D depend on?

From temperature Signup and view all the answers

Which imaging equipment can most accurately pinpoint cancerous tumors?

MRI Signup and view all the answers

Braking radiation is...

Performance depends on the accelerating voltage Signup and view all the answers

The patch-clamp technique...

It greatly narrows the surface area of the membrane to be tested Signup and view all the answers

Which EEG wave frequency falls in the frequency range from 4 Hz to 7 Hz?

Teta Signup and view all the answers

Which infusion solution causes haemolysis?

Hypotonic Signup and view all the answers

The magnitude of the QRS complex of the two-lead ECG signal is ...

1-2 mV Signup and view all the answers

Where is the blood pressure of a standing person highest?

In the foot Signup and view all the answers

How does the volumetric rate of a viscous liquid depend on viscosity?

Inversely proportional to viscosity Signup and view all the answers

What is the concentration of Na in isotonic NaCl saline?

0,9% Signup and view all the answers

Amount of effective dose is...

J/kg Signup and view all the answers

Which quantity decreases with increasing the number of measurements?

Error of the average Signup and view all the answers

Which is not a SI basic quantity?

The speed of light in vacuum Signup and view all the answers

Which unit of measurement is NOT an official SI unit?

Ev Signup and view all the answers

Which statement is WRONG? The dark-adapted eye...

The dark-adapted state develops within minutes when entering a dark room Signup and view all the answers

A kitten weighing 2 kg sits on a wall 1 m high and then runs on the ground at a speed of 4 m/s. When is its mechanical energy higher?

When sitting on the wall Signup and view all the answers

After one hour, what percentage of the inhaled isotope 11C with a half-life of 20 minutes has not yet decayed?

12,5% Signup and view all the answers

The stochastic biological effect

Its threshold dose strongly depends on the type of ionizing radiation Signup and view all the answers

Study Notes

Biophysics Questions and Answers

Question 1: Absolute error of radioactive counting reduces to a quarter if measured four times as long with constant activity.
Question 2: Weight is not an SI base unit. Luminous intensity is.
Question 3: Stochastic biological effects are inheritable, and their frequency increases with increasing dose. The effect does not require a threshold dose.
Question 4: The most significant change in light beam direction within the human eye occurs at the border between the lens and the vitreous body.
Question 5: Volumetric velocity of a viscous liquid is directly proportional to the pressure difference.
Question 6: Osmotic pressure is not equal to the partial pressure of the solvent. If a sound source approaches a detector, the detected frequency is higher than the emitted frequency. Stokes' law shows that the diffusion constant is inversely proportional to viscosity.
Question 7: Isotopes used for measuring blood dilution volume include 51Cr.
Question 8: When light travels from higher to lower refractive index, the refraction angle is less than the incidence angle. Higher notes have more penetrating power compared to lower notes. Thermography uses electromagnetic radiation. Mediated diffusion is usually faster than simple diffusion.
Question 9: The decay constant of a 1-second half-life radioactive isotope is approximately 0.7/s.
Question 10: A resting brain emits alpha waves.
Question 11: A biconcave lens acts as a spray lens when the refractive index of the lens is greater than the refractive index of the medium.
Question 12: CT scanning significantly reduces brain image resolution due to absorption from the skull.
Question 13: The Laplace Law describes the tension in the wall of a circular pipe created by the pressure inside.
Question 14: Blood pressure in the brain of a person suddenly standing up may decrease.
Question 15: If the radius of a blood vessel increases by 19%, the volume rate of blood flow increases by roughly twice.
Question 16: CT and PET imaging use ionizing radiation to create images.
Question 17: The dark-adapted eye is the most sensitive.
Question 18: Persistent interference of light waves occurs when the waves are coherent.
Question 19: The SI unit 1/s is used for the decay constant and frequency.
Question 20: Korotkov noise occurs when the flow in the artery changes from turbulent to laminar.
Question 21: A real, upright object within the focal length of the lens produces an image that's also real and upright.
Question 22: Alpha radiation has the greatest biological effect for the same energy transfer.
Question 23: In ultracentrifuging, heavier particles settle slower. A higher density medium results in a higher sedimentation rate.
Question 24: Beta decay reduces the mass number by one.
Question 25: Effective half-life of an administered radioactive isotope is less than its biological half-life.
Question 26: Alpha particles are helium nuclei (doubly ionized helium atoms).
Question 27: Beta waves have an amplitude of 50-100µV.
Question 28: Approximately 75% of a 10-minute half-life isotope 13N has decayed after 20 minutes.
Question 29: 6.25% of 14N isotope remains after 40 minutes, given its 10-minute half-life.
Question 30: The sum of the two thin lenses' refractive power determines the combined refractive power when in contact.
Question 31: Activity of a radioactive source is the number of radioactive decays per second.
Question 32: The Stokes' Law describes the resistance force on a spherical body moving in a viscous liquid.
Question 33: Echoencephalography does not involve using electromagnetic radiation.
Question 34: The sedimentation coefficient has a unit of kg/ms.
Question 35: The relative refractive index of the second medium to the first medium determines the extent of refraction at the boundary of two media.
Question 36: Coherent light waves will have their amplitudes add constructively.
Question 37: If a real object is beyond the focal length of a converging lens, the image formed will be real and inverted.
Question 38: Diathermy uses 2570 MHz.
Question 39: Medical ultrasound applications use a 2-18 MHz frequency band.
Question 40: Pressure of an ideal fluid flowing within a pipe does not change with an increase in the pipe's diameter.
Question 41: Pressure of an ideal fluid flowing within a pipe decreases as the diameter of the pipe decreases.
Question 42: Diffusion constant depends on temperature, the shape of diffusing particles, and the density of the medium.
Question 43: MRI is better than a CT for pinpointing cancerous tumors.
Question 44: Braking radiation's minimum wavelength depends only on the anode's material, and its total energy is roughly 60% of the electron beam's energy.
Question 45: Patch-clamp techniques keep membrane voltage at a preset value. This greatly narrows the area to be measured.
Question 46: Delta waves have a frequency range of 4-7 Hz.
Question 47: Hypotonic solutions cause hemolysis.
Question 48: 1-2 mV defines the QRS complex peak magnitude in a two-lead ECG signal.
Question 49: Lambert's Law describes light intensity lessening with material thickness.
Question 50: Blood pressure in a standing person is highest at the feet.
Question 51: Volumetric flow rate of viscous liquid is inversely proportional to viscosity.
Question 52: Isotonic saline solution has a sodium concentration of 0.9%.
Question 53: Effective dose is measured in J/kg.
Question 54: The error of the mean is reduced with increased measurements.
Question 55: Weight is not a base SI unit.
Question 56: Fermi is a non-SI unit.
Question 57: Dark-adapted eye visual acuity is good, not poor. The dark-adapted state develops quickly.
Question 58: Mechanical energy is higher when the kitten is running.
Question 59: Thermography uses electromagnetic radiation; photoelectron energy depends on light frequency, not intensity; mediated diffusion moves from lower to higher concentration.
Question 60: Approximately 12.5% of the 11C isotope remains after one hour (given its 20-minute half-life).
Question 61: Diffusion constants for globular proteins are smaller, increasing with temperature, and are inversely proportional to viscosity.
Question 62: Rad is a non-SI unit.
Question 63: 6.25% of the 13N remains after 40 minutes if its half-life is 10 minutes.
Question 64: Electron wavelength in a vacuum, accelerated by 1.5 V, is approximately 90nm.
Question 65: Persistent interference occurs with coherent light waves having a constant phase difference.
Question 66: The SI unit for a decay constant is 1/s.
Question 67: Typical activity for thyroid 131I is 2 mCi.
Question 68: Beta particles are high-energy electrons.
Question 69: Voltage-clamp technique keeps the membrane potential constant.
Question 70: Delta waves have an amplitude less than 20µV.
Question 71: Absolute error of the difference of values is found by the square root of the sum of the squares of each individual value's absolute error.
Question 72: The radioactive decay constant is inversely proportional to the half-life.
Question 73: Microwave slide terminals use 2540 MHz.
Question 74: Hypertonic solutions cause plasmolysis.
Question 75: Beta particles are not hydrogen nuclei.
Question 76: Irradiation dose is measured in Gray (Gy) or Sieverts (Sv).
Question 77: 2570 kHz is frequency for capacitor field diathermy.
Question 78: If a real object is located within the focal length of a converging lens, the virtual image is upright.
Question 79: The diffusion constant is not affected by the pH value of the medium.
Question 80: Alpha particles are doubly ionized helium nuclei.
Question 81: A light beam traveling through mediums of different refractive indices will refract with an angle of incidence. Higher notes have more penetrating power compared to lower notes; thermography uses electromagnetic radiation; mediated diffusion is faster than simple diffusion.
Question 82: The relative refractive index between two media determines the degree of refraction.
Question 83: Electron wavelength in a vacuum, accelerated by 1.5 V, is ~0.3µm.
Question 84: The light-adapted eye is the most sensitive, not the least sensitive; visual acuity is good, not poor.

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Description

Test your knowledge on various biophysics concepts, including radioactive counting, SI base units, and osmotic pressure. This quiz covers fundamental principles that are crucial for understanding biophysics and its applications in science. Challenge yourself with questions designed for students delving into the complexities of biological systems and their physical properties.