Choose Correct
Answers
1. X-rays
are:
(a) stream
of electrons (b)
stream of neutral particles
(c) stream
of positive ions (d)
electromagnetic radiations
2. What happens when fast moving electrons are stopped and fall on a
metallic target in an evacuated glass bulb?
(a) X-rays
are produced (b)
g–rays
are produced
(c) b–particles are
produced (d)
reflected back
3. Bragg’s equation, 2d sin q = nl will have no solution if:
(a) l < 2d (b) l > 2d (c) l < d (d) l > d
4. When objects placed in a room are exposed to X-rays, they appear:
(a)
invisible (b) blue (c) yellow (d) red
5. A direct X-ray photograph of the intestines not generally taken by
the radiologistics because:
(a)
intestines would burst on exposure to X-rays
(b) the
X-rays would not pass through the intestines
(c) the
X-rays will pass through the intestines without casting a good shadow for any
useful diagnosis
(d) a very
small exposure of X-rays causes cancer in the intestines
6. If li, lx and lu are the wavelengths of the infrared, X-rays
and ultraviolet rays respectively, then which of the following is correct:
(a) li < lu < lx (b) li = lu = lx (c) lx > li > lu (d) li > lu > lx
7. X-rays can be diffracted from crystals as the diffraction of light
from a grating. The crystal grating for X-rays has a grating element:
(a) equal
to the distance between any two nearest atoms
(b) equal
to the size of the crystal
(c) that
is, an integral multiple of the wavelength of X-rays.
(d) about 1/1000
of wavelength of X-rays.
