NUST Medical Chapter 20 and Chapter 21
NUST(Medical)
CHAPTER 20+21
(1)
In the
nuclear reaction 6C11 ®
5B11 + +1b0
+ X X stands for
(a) energy released (b) neutrino (c)
1H1 (d)
g-ray
(2)
One
sixteenth of the initial amount of radioactive isotopes remains unchanged after
two hours. The half life of isotope is
(a) 15 min (b)
45 min (c) 30 min (d)
60 min
(3)
The most
stable nuclei is
(a) Helium (b)
iron (c) uranium (d) krypton
(4)
Rest mass energy
of an electron
(a) 511 KeV (b)
0.5 KeV (c) 931 MeV (d) 510 meV
(5)
The working
a nuclear radiation detector depends upon
(a) voltage applied (b) ionization of charged
particle
(c) gas used in a detector (d)
all of these
(6)
Interaction
of nuclear radiation with matter depends upon
(a) mass of the particle (b) energy
of the particle
(c) charge of the particle (d) all of these
(7)
Range of a,b and g particle in matter is
(a) a > b >
g
(b) b >a >
g
(c) g >
b
> a (d)
a>
g
>b
(8)
Solid state
detector is operated on
(a) forward biased (b) reverse biased
(c) may be forward may be reversed (d) no biasing at all
(9)
The magnitude of pulse in a solid state
detector depends upon
(a) energy of charged particle (b)
charge of charged particle
(c) mass of charged particle (d) none of these
(10)
The best place to store nuclear waste is
(a) oceans (b)
canals (c) old salt
mines (d) Coal mine
(11)
Which of the
series is more energetic
(a) K series (b) L series (c)
M series (d) N series
(12)
An atom X is
excited to an energy E2 from the ground state Eo by
collision with an atom which of the following statements is correct the
electron in X lose energy just after collision (II) the excited atom X emits a
photon given by hf=Eo-E2 (III) the colliding atom must have lost
energy to excite X
(a) all are correct (b) II and III (c) I and III (d)
III only
(13)
The spacing
of an atomic layers in a crystal can be measured using x-rays wavelength in
meter of the order of
(a) 10-6 (b) 10-7 (c) 10-9 (d) 10-10
(14)
X-rays are
produced by energy changes in
(a) the nucleus (b)
electron close to the nucleolus
(c) electrons far from nucleus (d) electrons and
protons
(15)
The half life of radon gas is 60 sec. This can be
changed by
(a) mixing with another radioactive
gas (b) heating radon
(c) increasing pressure (d) none of
these
(16)
Which is of
the following is good nuclear fuel
(a) neptunium 239 (b) uranium 236 (c) plutonium 239 (d) thorium 236
(17)
Starting
with a sample of pure
of it decays into Zn
in 15 minutes the corresponding half life is
(a) 10 min (b)
15 min (c) 5 min (d)
min
(18)
An a-particle incident on a nuclide X produces nuclide Y and
two b-particles
which is correct?
(a) x=90, y=39 (b) x=92, y=39 (c) x=92, y=41 (d) x=90, y=38
(19)
Freshly
prepared radioactive sample of half life 1 hour emits radiations that are 128
times as intense as the permissible safe limit. The minimum time after which
the sample can be safely used is
(a) 14 h (b)
7 h (c)
128 h (d) 256 h
(20)
The source
of energy in sun and star is
(a) fission (b)
Fusion (c)
chemical reaction (d) combustion
(21)
Nuclear
forces arises from continuous exchange of particles known as
(a) mesons (b)
baryons (c) positrons (d) leptons
(22)
Two protons
attract each other when the distance between them is nearly
(a) 10-1m (b) 10-10m (c) 10-15m (d) statement is wrong
(23)
The emission
of b-rays is followed by the
emission of a
(a) a-ray (b) neutrino (c) antineutrino (d) neutron
(24)
What are the
values of a and z in the following nuclear reaction
(a) 17, 7 (b)
7, 17 (c) 13, 6 (d) 6, 13
(25)
In which sequence the radioactive radiations are
emitted in the following nuclear reaction.
(a)
a,b,g (b) b,a,g (c)
g,a, b (d) g, b, a
(26)
What is the
missing nuclei in the following reaction
(a) 2He4 (b) 1H1
(c) on1
(d) 1H3
(27)
Number of
electrons in the nucleus of 92U235 are
(a) 235 (b)
92 (c) 91 (d) none of these
(28)
Electrons
are
(a) Hardons (b)
Leptons (c) Baryons (d) Photons
(29)
When an animal dies each gram of carbon in its
body emits about 16b particles each minute. Each gram of carbon from
some animal remains is found to emit 4b
particles per minute. How old is the animal (Half life of radioactive carbon is
6000 years)
(a) 3000 years (b)
6000 years (c) 12000 years (d) 18000 years
(30)
Which of the
following nuclides has equal number of neutrons and protons
(a) 1H1 (b) 4Be9 (c) 2He4
(d) 3Li7
(31)
In proton–proton
cycle number of neutrinos emitted are
(a) one (b)
two (c) three (d) no neutron is emitted
(32)
The damage
of ozone layer is mainly due to release of
(a) carbon mono oxide (b) chloroflouro carbons
(c) methane (d) ethane
(33)
Which
radiation should be used for treatment of infection in the interior
(a) a-rays (b) b-rays (c) g-rays (d) all of these
(34)
An electron
in a hydrogen like atom is in excited state. It has a total energy of –3.4eV. Its kinetic energy is
(a) 3.4eV
(b) 6.8 eV (c) –3.4eV (d) –6.8 eV
(35)
In helium
neon laser active medium
(a) helium (b)
neon (c) argon (d) none of these
(36)
Positive
rays are
(a)
electromagnetic waves (b) ions (c)
electron (d) neutrons
(37)
Number of
series of Bohr’s atom lies in ultraviolet region are
(a) one
(b) two (c) three (d) four
(38)
X-ray region
lies between
(a) g-rays and visible region (b) g-rays
and ultraviolet
(c) radio waves and visible region (d) both “b” and “c”
(39)
Life time of
metastable excited states is
(a) 10-8sec (b) 10-3sec (c) 10-5 sec (d) 10-2 sec
(40)
In Bohar
model of hydrogen atom. In going from
lower to higher orbit
(a) P.E decrease, T.E decreases (b) P.E decrease, T.E
increase
(c) P.E increases T.E increases (d) P.E increases T.E
remains constant
(41)
The diagram
shows a narrow beam of charged particles entering a uniform magnetic field.
What type of radiations does the beam contain
(a) a-particles and b particles (b)a-particles
and g-particles
(c) a-particles only (d)
b-particles
only
(42)
The uranium
atom 92U238 emits an a
particle to become thorium, which then emits a b-particles
to become protactinium. What is the proton number of protactinium
(a) 89 (b)
91 (c) 95 (d) 85
(43)
Nuclide 90X225 decays to
nuclide Y with the emission of two a
particles and one b-particle. What is the composition of Y?
(a) 89Y221 (b) 85Y217 (c) 87Y217
(d) 86Y216
(44)
a
Particle is bombarded on
as a result
is formed. The particle emitted is
(a) neutron
(b) proton (c) electron (d)
positron
(45)
Which of the
following is a fusion reaction
(a)
(b)
(c)
(d)
none of these
(46)
Curie is a
unit of
(a) energy of b-rays (b) half life (c) radioactivity (d)
intensity of g-rays
(47)
S.I unit of
absorbed does of radiation are
(a)
Curic (b) Gray (c) Rad (d) None of these
(48)
To cure
thyroid cancer we use
(a) Na–24 (b)
Iodine–131 (c) N–14 (d) Co-60
(49)
In a nuclear
reactor cadmium rods are used to
(a) slow down neutrons (b) absorb
neutrons
(c) speed up neutrons (d) produce neutrons
(50)
A free
proton is
(a) stable (b)
unstable
(c) some times stable and some time unstable
(d) All of these
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