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Biophysics 1 > 1st Midterm 1st Semester > Flashcards

1st Midterm 1st Semester Flashcards

1
Q

The eyepiece of a microscope forms a… A) Diminished, erect, virtual picture/image. B) Magnified, erect, virtual picture/image. C)Diminished, inverted, real picture/image. D)Magnified, inverted, real picture/image.

A

D) Magnified,inverted, real picture/image

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2
Q

Which kind of calibration line did you plot at the “Refractometer” practise? A) Refractive index versus wavelength B) Refractive index versus concentration C) Refractive index versus density D)Refractive index versus the angle of the incident light

A

B)Refractive Index versus concentration

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3
Q

Using a convex lens, if the object distance is shorter then the focal distance the image is…

A) real, magnified and upright

B) real, magnified and inverted

C) virtual, magnified and upright

D) virtual, reduced and inverted

A

C) virtual, magnified and upright.

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4
Q

The dual nature of light means that

A) The light has an electric and magnetic component

B)The light has wave and particle character as well

C) The light wave has phase and amplitude

D)The light can be charactrized with frequency and wavelentgh

A

B) The light has wave and particle character as well

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5
Q

In the optical fibre the refractive index of the core

A) Is smaller than the refractive index of the coating

B) Is bigger then the refractive index of the coating

C) Is equal to the refractive index of the coating

D) Can be smaller and bigger as well, than the refractive index of the coating

A

B) Is bigger then the refractive index of the coating

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6
Q

Which radiation is not electromagnetic radiation?

A) Ultrasound

B) Gamma radiation

C) X-radiation

D) Light

A

A) Ultrasound

Why: it is a mechanical wave not electromagnetic wave - needs to travel through a medium.

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7
Q

The irradiance in the case of thermal radiation

A) Inversely depends on the temperature of the body and the environment

B) Depends on the 4th power of the temperature

C) Linearly depends on the temperature of the body

D) Depends only on the temperature of the body

A

D) Depends only on the temperature of the body

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8
Q

22) What is the unit of conductance?

A) Ohm

B) Volt

C) Simens

D) Ampere

A

C) Simens

(Remember: Always Simens!)

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9
Q

The distance in microscope…

A) is less than the focal length of the object

B) is greater than the image distance of the object lens

C) is greater than focal length of the objective lens

D) is greater than two times the focal length of the objective lens

A

C) is greater that the focal length of the objective lens

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10
Q

Why is it necessary to use a compensating prism in the abbe Refractometer?

A) So light arriving at greater then the critical angle will not reach the field of vision

B) Because the refractive index depends on the wavelength and the dispersed spectrum would appear in the field of vision.

C) so scattered light will not reach the field of vision

D) because it is used to set the measuring limit of the appliance

A

B) because the refractive index depends on the wavelength and the dispersed spectrum would appear in the field of vision.

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11
Q

Pick the right statement on thermal radiation

A) The temperature of the black body can be determined of the maximum point if its emission spectrum

B) The maximum of the emission spectrum depends on the mass of the emitting body

C) The maximum of the emission sepctrum depends on the temperature of the environment

D) Mercury vapour lamp is based on thermal radiation

A

A) The temperature of the absolute black body can be determined of the maximum point if its emission spectrum is know

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12
Q

What does the maximum point of the spectrum of the thermal radiation emitted by the absolute black body radiation depends on?

A) The temperature of the emitting body

B) The atomic composition of the emitting body

C) The colour of the emitting body

D) The thickness of the emitting body

A

A) The temperature of the emitting body

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13
Q

The refractive index of the oprical fibre..

A) Is less than that of its coating

B) Is greater then that of its coating

C) Is equal to that of its coating

D) Can be either less or greater then that of its coating.

A

B) Is greater then that of its coating

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14
Q

Light has a dual nature, because…

A) There are alternating electric and magnetic fields spreading in it

B) It has both wave and particle characters

C) It is able to do both constructive and deconstructive interference

D) It can be characterized both by wavelength and frequency

A

B) it has both wave and particle characters

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15
Q

If we want to measure 9V direct voltage by the digital multimeter. Which is the correct setting?

A) DCV 2V

B) DCV 20V

C) ACV 2V

D) ACV 20V

A

B) DCV 20V

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16
Q

The distance between the intermediate image of a microscope and the eyepiece…

A) Is greater then the tube length

B) Is less than the focal length of the eyepiece

C) Is greater than the focal length of the objective lens

D) Is greater then two times the focal length of the object lens

A

B) Is less than the focal length of the eyepiece

17
Q

What does the refractive index of the solution depend on?

A) Only on the concentration of the solution

B) Only on the quality and concentration of the solution

C) Only on the quality and concentration of the solution, and wavelentgh of the illuminating light

D) On the quantity and concentration of the solution, the wavelength of the illuminating light and the temperature

A

D) On the quantity and concentration of the solutio, the wavelength of the illuminating light and the temperature.

18
Q

According to Wien’s displacement law, the maximum point of the thermal radiation emitted by a black body…

A) Doesn’t depend on its temperature.

B) Is directly proportional to the thermodynamic temperature.

C) Is inversely proportional to the thermodynamic temperature.

D) Is directly proportional to the 4th power of the absolute temperature.

A

D) Is directly proportional to the 4th power of the absolute temperature.

19
Q

How does the radiant emittance of a body chage if its thermodynamic temperature decreases to the 9-fold?

A) Decreases 9-fold

B) Decreases 81-fold

C) Increases 81-fold

D) Increases 9-fold

A

B) Decreases 81-fold

20
Q

Which is the correct order of electromagnetic radiation according to photon energies?

A) Radio waves - UV radiation- Gamma radiation

B)Microwaves- UV radiation- infrared light - x-radiation

C)Visble light- radio waves-x-radiation- Gamma radiation

D) Microwaves- X-radiation- visible light

A

A)Radio waves - UV radiation- Gamma radiation

Radiowaves, microwaves, infrared, visble light, ultraviolet light, X-radiation, gamma radiation

21
Q

What doesn’t influence the refractive index?

A) The intensity of the illumination (illuminating) light

B) The wavelength of the illuminating light

C) The quality of the adjacent media

D) the concentration of the adjacent media

A

A) The intensity of the illumination (illuminating) light

22
Q

If we want to measure 4.5 V direct Voltage by the digital multimeter, which is the correct range setting?

A) DCV 2V

B)DCV 20V

C)DCV 200V

D)DCV 1000V

A

B) DCV 20 V

*always is this value for a digital multimeter

23
Q

The refractive index of the optical fiber:

A) Is less than that of its coating

B) Is greater than that of its coating

C) Is equal to that of its coating

D) Can be either greater or lesser than that of its coating

A

B) Is greater than that of its coating

24
Q

Which of the following quantities is not extensive?

A) Mass

B) Volume

C) Temperature

D) Charge

A

C) Temperature

25
Q

The radiant emittance of the absolute black body:

A) Does not depend on temperature

B) Is inversely proportional to its temperature

C) Is inversely proportional to the fourth power of its temperature

D) Is directly proportional to the fourth power of its temperature

A

D) Is directly proportional to the fourth power of its temperature.

26
Q

The de Broglie’s equation defines

A) The relationship between the moment and the wavelength of a particle

B)The relationship between the kinetic energy and wavelength

C) The relationship between the moment and the velocity

D) The relationship between the moment and the kinetic energy

A

A) The relationship between the moment and the wavelength of a particle

27
Q

A system is open:

A) If the value of the intensive variable is independent from the space and time

B) If the mass is constant

C) If only energy exchange is possible

D) If both material and energy exchange is possible

A

D) If both material and energy exchange is possible

28
Q

Which is not an extensive variable?

A) Volume

B) Mass

C) Energy

D) Density

A

D) Density

29
Q

Select the correct statement:

A) US is high frequency electromagnetic radiation

B) US is a mechanical wave with wavelength much longer than that of the audible sound range

C) US is a mechanical wave with frequencies much less than that of the audible sound range

D)US is a mechanical wave with frequencies many times ten-thousand Hz or even more

A

D) US is a mechanical wave with frequencies many times ten-thousand Hz or even more

30
Q

The eyepiece of a microscope froms a…

A) Diminished, erect,virtual picture/image

B) Magnified,erect, vitual picture/image

C) Diminished, inverted,real picture/image

D) Magnified, inverted, real picture/image

A

D) Magnified, inverted, real picture/image

Biophysics 1 (5 decks)

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