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Atoms and Nuclei

126 Questions
All Exams NEET AIIMS
2004 NEET MCQ
AIPMT 2004
If M(A; Z), Mp and Mn denote the masses of the nucleus ${}_Z^AX,$ proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its bonding energy in MeV, then
A.
M(A, Z) = ZMp + (A $-$ Z)Mn $-$ BE
B.
M(A, Z) = ZMp + (A $-$ Z)Mn + BE/c2
C.
M(A, Z) = ZMp + (A $-$ Z)Mn $-$ BE/c2
D.
M(A, Z) = ZMp + (A $-$ Z)Mn + BE
2004 NEET MCQ
AIPMT 2004
The half life of radian is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after
A.
4800 years
B.
6400 years
C.
2400 years
D.
3200 years
2003 NEET MCQ
AIPMT 2003
In which of the following systems will the radius of the first orbit (n = 1) be minimum ?
A.
doubly ionized lithium
B.
singly ionized helium
C.
deuterium atom
D.
hydrogen atom
2003 NEET MCQ
AIPMT 2003
The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of ${}_2^4$ He is
(Given helium nucleus mass $ \approx $ 4.0015 u.)
A.
0.0305 J
B.
0.0305 erg
C.
28.4 MeV
D.
0.061 u
2003 NEET MCQ
AIPMT 2003
The mass number of a nucleus is
A.
always less than its atomic number
B.
always more than its atomic number
C.
sometimes equal to its atomic number
D.
sometimes less than and sometimes more than its atomic number
2003 NEET MCQ
AIPMT 2003
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force $\overrightarrow F $ between the two is
A.
$K{{{e^2}} \over {{r^2}}}\widehat r$
B.
$ - K{{{e^2}} \over {{r^3}}}\widehat r$
C.
$K{{{e^2}} \over {{r^3}}}\widehat r$
D.
$ - K{{{e^2}} \over {{r^2}}}\widehat r$
2003 NEET MCQ
AIPMT 2003
Solar energy is mainly caused due to
A.
burning of hydrogen in the oxygen
B.
fission of uranium present in the Sun
C.
fusion of protons during synthesis of heavier elements
D.
gravitational contraction
2003 NEET MCQ
AIPMT 2003
A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is
A.
1.35 g
B.
2.50 g
C.
3.70 g
D.
6.30 g
2003 NEET MCQ
AIPMT 2003
A nuclear reaction given by

ZXA $ \to $ z+1YA + $-$1e0 + $\overline v $ represents
A.
$\beta $-decay
B.
$\gamma $-decay
C.
fusion
D.
fission
2003 NEET MCQ
AIPMT 2003
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about
A.
101
B.
105
C.
1010
D.
1015
2002 NEET MCQ
AIPMT 2002
A sample of radioactive element containing 4 $ \times $ 1016 active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days
A.
0.5 $ \times $ 1016
B.
2 $ \times $ 1016
C.
3.5 $ \times $ 1016
D.
1 $ \times $ 1016
2002 NEET MCQ
AIPMT 2002
A deutron is bombarded on 8O16 nucleus then $\alpha $-particle is emitted. The product nucleus is
A.
7N13
B.
5B10
C.
4Be9
D.
7N14
2002 NEET MCQ
AIPMT 2002
Which of the following are suitable for the fusion process ?
A.
light nuclei
B.
heavy nuclei
C.
element lying in the middle of the periodic table
D.
middle elements, which are lying on binding energy curve.
2001 NEET MCQ
AIPMT 2001
Which rays contain (positive) charged particles ?
A.
$\alpha $-rays
B.
$\beta $-rays
C.
$\gamma $-rays
D.
X-rays
2001 NEET MCQ
AIPMT 2001
Mn and Mp represent the mass of neutron and proton respectively. An element having mass M has N neutrons and Z protons, then the correct relation will be
A.
M < {N $ \cdot $ Mn + Z $ \cdot $ Mp}
B.
M > {N $ \cdot $ Mn + Z $ \cdot $ Mp}
C.
M = {N $ \cdot $ Mn + Z $ \cdot $ Mp}
D.
M = N {Mn + Mp}
2001 NEET MCQ
AIPMT 2001
X(n, $\alpha $) ${}_3^7$Li, then X will be
A.
${}_5^{10}$ B
B.
${}_5^9$ B
C.
${}_5^{11}$ Be
D.
${}_2^4$ He.
2001 NEET MCQ
AIPMT 2001
Energy released in nuclear fission is due to
A.
some mass is converted into energy
B.
total binding energy of fragments is more than the binding energy of parantal element
C.
total binding energy of fragments is less than the binding energy of parental element
D.
total binding energy of fragments is equal to the binding energy of parental element.
2001 NEET MCQ
AIPMT 2001
The energy of hydrogen atom in nth orbit is En then the energy in nth orbit of singly ionised helium atom will be
A.
4En
B.
En/4
C.
2En
D.
En/2
2001 NEET MCQ
AIPMT 2001
The interplanar distance in a crystal is 2.8 $ \times $ 10$-$8 m. The value of maximum wavelength which can be diffracted
A.
2.8 $ \times $ 10$-$8 m
B.
5.6 $ \times $ 10$-$8 m
C.
1.4 $ \times $ 10$-$8 m
D.
7.6 $ \times $ 10$-$8 m
2001 NEET MCQ
AIPMT 2001
Half life of a radioactive element is 12.5 hour and its quantity is 256 g. After how much time its quantity will remain 1 g?
A.
50 hrs
B.
100 hrs
C.
150 hrs
D.
200 hrs
2000 NEET MCQ
AIPMT 2000
Maximum frequency of emission is obtained for the transition
A.
n = 2 to n = 1
B.
n = 6 to n = 2
C.
n = 1 to n = 2
D.
n = 2 to n = 6.
2000 NEET MCQ
AIPMT 2000
The relation between $\lambda $ and T1/2 as (T1/2 $ \to $ half life)
A.
T1/2 = ${{\ln 2} \over \lambda }$
B.
T1/2 ln2 = $\lambda $
C.
T1/2 = ${1 \over \lambda }$
D.
($\lambda $ + T1/2) = ln2
2000 NEET MCQ
AIPMT 2000
Nuclear fission is best explained by
A.
liquid droplet theory
B.
Yukawa $\pi $-meson theory
C.
independent particle model of the nucleus
D.
proton-proton cycle.
2000 NEET MCQ
AIPMT 2000
The life span of atomic hydrogen is
A.
fraction of one second
B.
one year
C.
one hour
D.
one day
2000 NEET MCQ
AIPMT 2000
For the given reaction, the particle X is
$_6{C^{11}} \to {}_5{B^{11}} + {\beta ^ + } + X$
A.
neutron
B.
anti neutrino
C.
neutrino
D.
proton
2000 NEET MCQ
AIPMT 2000
When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be
A.
first line of Lyman series
B.
second line of Balmer series
C.
first line of Balmer series
D.
second line of Paschen series.