Radiology
Objective Type Questions
(Series –
48)
Q. 1. Gas filled tubes has the following
disadvantages,
(a). kV & mAs are difficult to control
independently
(b). produce blackening thus shortening its
life
(c). speed of electron will be reduced thus
energy of the x-rays would be lesser
(d). all of the above
Q. 2. Very hard x-rays have the tube voltage,
(a). 0-10kV
(b). 20-60kV
(c). 150-400kV
(d). 400-3000kV
Q. 3. In coherent scattering, the single
electron is involved in interaction in,
(a). Thomson scattering
(b). Rayleigh scattering
(c). both of the above
(d). none of the above
Q. 4. What is not true about EM waves,
(a). electrons are only allowed to be in
orbits which correspond to discrete energy levels.
(b). a uniform cloud of negative electrons
surrounds a positive nucleus whose size is about 10-12 cm
(c). electrons revolve around nucleus as
planets do around the sun
(d). electrons, protons and neutrons form a neutral
spherical gas with diameter around 10-8m
Q. 5. Rotating anode x-ray tubes were
introduced into diagnostic radiology in order to,
(a). reduce patient dose
(b). distribute heat over a larger anode area
(c). allow low kV technique
(d). trigger the bucky apparatus
Q. 6. Edison effect is related to,
(a). thermionic emission
(b). photoelectric effect
(c). chemical effect
(d). none of the above
Q. 7. In Goodge`s principle, the x-ray tube
is designed so that it have the following,
(a). angled target
(b). line focus principle to have small
effective target area
(c). dual focus
(d). all of the above
Q. 8. Heat at anode is,
(a). less than 1%
(b). less than 40%
(c). less than 90%
(d). less than 99%
Q. 9. Out of interaction of x-ray with
matter, which occur in range of diagnostic radiology?
(a). coherent scattering
(b). photoelectric absorption & Compton
scattering
(c). pair production and photodisintegration
(d). none of the above
Q. 10. A high energy Compton scattered
photon,
(a). most likely scatters at 90 degree
(b). most likely scatters in forward
direction
(c). is equally scattered in all direction
(d). most likely scattered backwards
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Answers
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|
Q.
1 -
(d)
Q.
3 -
(a)
Q.
5 -
(b)
Q.
7 -
(d)
Q.
9 -
(b)
|
Q.
2 -
(d)
Q. 4 -
(a)
Q.
6 -
(a)
Q.
8 -
(d)
Q.10 - (b)
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