893410
Questão 1
Questão
True or false? When X-rays are being taken, barium meals are used to provide a contrast medium to show soft tissues.
Responda
- True
- False
Questão 2
Questão
What does a charge-coupled device (CCD) do in X-ray imaging?
Responda
-
Create an electrical charge to start emission of X-rays
-
Convert X-rays to light to show an image
-
Create a computerised tomography, 3D, scan
Questão 3
Questão
What is the frequency of ultrasound waves?
Responda
-
Less than 20Hz
-
Between 20Hz and 20,000Hz
-
Greater than 20,000Hz
Questão 4
Questão
True or false? If an ultrasound transducer is used to measure the length of an eyeball, this is called an I-scan.
Responda
- True
- False
Questão 5
Questão
Which of these formulae is used to calculate the depth of a boundary using ultrasound?
Responda
-
depth = speed of wave * transit time
-
depth = 2 * speed of wave * transit time
-
depth = 0.5 * speed of wave * transit time
Questão 6
Questão
True or false? Snell's law states that the sine of the incident angle divided by the sine of the refractive angle is the same for each type of substance (e.g. it is the same in all glass).
Responda
- True
- False
Questão 7
Questão
Which way would the light ray refract if it entered a medium with a higher refractive index?
Responda
-
Away from the normal
-
Towards the normal
-
It would not refract
Questão 8
Questão
When will total internal reflection occur?
Responda
-
When the angle of incidence is less than the critical angle
-
When the angle of incidence is equal to the critical angle
-
When the angle of incidence is greater than the critical angle
Questão 9
Questão
True or false? The equation connecting refractive index and critical angle is n = sin c.
Responda
- True
- False
Questão 10
Questão
True or false? The principal focus of a converging lens is the point from which light rays spread out.
Responda
- True
- False
Questão 11
Questão
True or false? The formula to calculate magnification is image height/object height.
Responda
- True
- False
Questão 12
Questão
Which of these statements are true about the image formed by a converging lens where the object is beyond the principal focus?
Responda
-
Virtual
-
Real
-
Diminished
-
Magnified
-
Upright
-
Inverted
Questão 13
Questão
Which of these statements are true about the image formed by a converging lens where the object is between the lens and the principal focus?
Responda
-
Virtual
-
Real
-
Diminished
-
Magnified
-
Upright
-
Inverted
Questão 14
Questão
Which of these statements are true about the image formed by a diverging lens?
Responda
-
Virtual
-
Real
-
Diminished
-
Magnified
-
Upright
-
Inverted
Questão 15
Questão
Which part of the eye is light focused on?
Responda
-
Cornea
-
Iris
-
Retina
-
Lens
-
Ciliary muscles
-
Sclera
-
Suspensory ligaments
-
Pupil
Questão 16
Questão
Which part of the eye adjusts the thickness of the eye lens?
Responda
-
Cornea
-
Iris
-
Retina
-
Lens
-
Ciliary muscles
-
Suspensory ligaments
-
Sclera
-
Pupil
Questão 17
Questão
True or false? The range of vision is the distance between the near point and the far point; for the human eye, this is between 25cm and infinity.
Responda
- True
- False
Questão 18
Questão
What is the unit of power of a lens?
Responda
-
Watt
-
Dioptre
-
Farad
Questão 19
Questão
Which of these statements are true about myopia (short sight)?
Responda
-
The eyeball is too short
-
The eyeball is too long
-
The lens is too powerful
-
The lens is too weak
-
The image forms in front of the retina
-
The image forms behind the retina
-
A converging lens can correct it
-
A diverging lens can correct it
Questão 20
Questão
Which of these statements are true about hyperopia (long sight)?
Responda
-
The eyeball is too short
-
The eyeball is too long
-
The lens is too powerful
-
The lens is too weak
-
The image forms in front of the retina
-
The image forms behind the retina
-
A converging lens can correct it
-
A diverging lens can correct it
Quer criar seus próprios Quizzes gratuitos com a GoConqr? Saiba mais.