Q.1.
The first emission line in the atomic spectrum of hydrogen in the Balmer series appears at ... [ pb. PMT 1996]
-
25%
a)
-
75%
b)
-
0%
c)
-
0%
d)
Q.2.
Which of the following statements is incorrect? [ AMU 1997]
-
20%
a) Cathode rays carry negative charge
-
40%
b) frequency of X-ray is higher than that of microwaves
-
0%
c)Unit for wave number is m-1
-
40%
d)Threshold frequency is the same for all metals
Explanation
Q.3.
Number of nodal plane 'd' orbital has .... [ KCET 1996]
-
33%
a) 1
-
50%
b) 2
-
17%
c)3
-
0%
d)0
Q.4.
The charge of the atom having 17 protons, 18 neutrons and 18 electrons is [ KCET 1994]
-
40%
a) +1
-
40%
b) -1
-
20%
c) -2
-
0%
d) Zero
Q.5.
The maximum number of electrons in an atom with l=2 and n=3 is ..[PMP PET 1998]
-
0%
a)2
-
33%
b) 6
-
33%
c)12
-
33%
d)10
Q.6.
When the value of azimuthal quantum number , l=2, value of 'n' will be .... [ CPMT 1995]
-
40%
a) 3
-
20%
b) 4
-
20%
c)5
-
20%
d)any one of these
Q.7.
The heaviest particle is ....[ DPMT 1994]
-
14%
a) Meson
-
43%
b) Neutron
-
29%
c)Electron
-
14%
d)Proton
Q.8.
The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is .... [CPMT 1997]
-
0%
a) 2
-
0%
b) 17
-
40%
c) 37
-
60%
d) 38
Q.9.
Which of the following is the cause of late discovery of neutron? [ AIIMS 1998]
-
50%
a)Neutron is charge less particle
-
33%
b) Neutron is highly unstable particle
-
0%
c)neutron in the nucleus moves very fast
-
17%
d)All of these
Q.10.
What do you mean by degenerate orbitals? ... [ CBSE PMT 19996]
-
40%
a) Orbitals having equal energy
-
0%
b) Orbitals having equal wave function
-
40%
c)Orbital having equal energy but different wave function
-
20%
d)Orbitals having equal energy and equal wave function
Q.11.
Consider the following ionsNi2+Co2+Cr2+Fe3+ Atomic number Cr=24, Fe - 16, Co=27, Ni=28 The correct sequence of the increasing order of the number of unpaired electrons is ....
-
0%
a) 1, 2, 3, 4
-
67%
b) 4, 2, 3, 1
-
33%
c) 1, 3, 2, 4
-
0%
d) 3, 4, 2, 1
Q.12.
Wavelength associated with electron motion ... [ BHU 1998]
-
33%
a)increases with increase in speed of electron
-
33%
b) remains same irrespective of speed of electron
-
33%
c)decreases with increase of speed of electron
-
0%
d)is zero
Q.13.
Which orbital of carbon can absorb photon but not emit it?{CPMT 1997]
-
50%
a) 1s
-
0%
b) 2s
-
50%
c)3p
-
0%
d)2p
Explanation
Q.14.
Atomic weight of an element is not necessarily whole number because... [ DCE 1994]
-
0%
a) It contains electrons, protons and neutrons
-
67%
b) It contains allotropic forms
-
0%
c) atoms are no longer considered indivisible
-
33%
d) it contains isotopes
Q.15.
Planck's constant has the same dimensions as that of ... [ AIIMS 1998]
-
29%
a)power
-
14%
b) work
-
0%
c)radiation energy
-
57%
d)angular momentum
Q.16.
The value of quantum numbers n, l, and m for 5th electron of Born will be
-
0%
a) n=1, l=0, m=-1
-
50%
b) n=2, l=1, m=-1
-
25%
c)n=2, l=2, m=-1
-
25%
d)n=1, l=2, m=-1
Q.17.
The hydride ion is isoelectric with ..... [ AFMC 1995]
-
20%
a) H+
-
20%
b) He+
-
60%
c)He
-
0%
d)Be
Q.18.
Electron configuration of four metals are given below. Which of the corresponding element would be most paramagnetic? [ AMU 1997]
-
0%
a) 1s2, 2s2, 2p6
-
33%
b) 1s2, 2s2 2p1
-
33%
c) 1s2, 2s2, 2p5
-
33%
d) 1s2, 2s2 2p4
Q.19.
An electron has magnetic quantum number as -3, what is its principal quantum number
-
0%
a)1
-
25%
b) 2
-
0%
c)3
-
75%
d)4
Q.20.
The electron configuration of 21Sc is ...{BHU 1997]
-
60%
a) 1s2 2s2 2p6 2s2 3p64s23d1
-
0%
b)1s2 2s2 2p6 2s2 3p64s13d2
-
0%
c)1s2 2s2 2p6 2s2 3p64s03d3
-
40%
d)1s2 2s2 2p6 2s2 3p64s23d2
Q.21.
Which of the following has maximum number of unpaired electrons? [ IIT 1996]
-
25%
a) Mg2+
-
25%
b) Ti3+
-
25%
c)V3+
-
25%
d)Fe2+
Q.22.
Bohr's radius of Hydrogen atom is ... [ Haryana CEET 1994]
-
25%
a) 0.529 × 10-8 m
-
25%
b) 0.529 ×10-10 m
-
25%
c) 5.29 ×10-8 m
-
25%
d) 5.29 × 10-10 m
Q.23.
the electrons identified by quantum numbers n and l (i) n=4, l=1 (ii) n=4, l=0 (iii) n=3 , l=2 (iv) n=3, l=1 can be placed in order of increasing energy, from the lowest to highest, as
-
75%
a)(iv) < (ii) < (iii) <(i)
-
0%
b) (ii) < (iv) < (i) < (iii)
-
25%
c)(i) < (iii) < (ii) < (iv)
-
0%
d)(iii) < (i) < (iv) < (ii)
Q.24.
The outer electronic configuration of 3s2 3p5 is possessed by... [ KECT 1997]
-
0%
a) O
-
50%
b) Cl
-
50%
c)Br
-
0%
d)Ar
Q.25.
The paramagnetic character follows the order .... [ CBSE MPT 1997]
-
20%
a) Mg > Cr > Zn
-
0%
b) Fe > Zn >Co
-
60%
c)Cr > Fe > Zn
-
20%
d)Hg > Mn > Fe
Q.26.
Bohr's model was modified by ... [ EAMCET 1995]
-
20%
a) Sommerfeld
-
40%
b) Rutherford
-
40%
c) Dalton
-
0%
d) Pauli
Q.27.
ratio of mass of proton and electron is ... [ BHU 1998]
-
0%
a)infinite
-
86%
b) 1.8 × 10+3
-
14%
c)1.8
-
0%
d)none of these
Q.28.
Brackett series are produced when the electrons from outer orbits jump to .... [ Pb CET 1997]
-
20%
a) 2 nd orbit
-
20%
b) 3 rd orbit
-
40%
c)4 th orbit
-
20%
d)5 th orbit
Q.29.
heisenberg's Uncertainty Principle is applicable to ... [ BHU 1994]
-
20%
a) atoms only
-
20%
b) electrons only
-
0%
c)nucleus only
-
60%
d)any moving object
Q.30.
An element M has an atomic mass 19 and atomic number 9, its ion is represented by [ IIT 1996]
-
0%
a) M+
-
33%
b) M2+
-
33%
c) M-
-
33%
d) M2-
Q.31.
Which of the following has more unpaired d-electrons? [ CBSE PMT 1999]
-
0%
a)Zn+
-
67%
b) Fe3+
-
33%
c)Cu3+
-
0%
d)Cu+
Q.32.
The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. the possible value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are) .. [ IIT 1998]
-
0%
a) -3.4 eV
-
67%
b) - -4.2 eV
-
33%
c)-6.8 eV
-
0%
d)+6.8 eV
Q.33.
the configuration 1s2, 2s2 2p5 3s1 shows .....[AIIMS 1997]
-
0%
a) ground state of fluorine
-
33%
b) excited state of fluorine
-
67%
c)excited state of Neon atom
-
0%
d)excited sate of O2-
Q.34.
Azimuthal quantum number determines the .... [ BHU 1995]
-
0%
a) size
-
25%
b) spin
-
25%
c) orientation
-
50%
d) angular momentum of orbitals
Q.35.
Which is not true with respect to cathode rays? [ kerala CEE 2001]
-
0%
a)A stream of electron
-
0%
b) Charged particles
-
80%
c)Move with speed same as that of light
-
20%
d)can be deflected by magnetic fields
Explanation
Q.36.
In H atom electron jumps from 3rd to 2nd energy level, the energy released is ... [ AFMC 1997]
-
40%
a) 3.03 ×10-19 J/atom
-
20%
b) 1.03 ×10-19 J/atom
-
40%
c)3.03 ×10-12 J/atom
-
0%
d)6.06 ×10-19 J/atom
Q.37.
if the planck's constant h=6.6×10-34 Js, the de Broglie wave length of a particle having momentum of 3.3×10-24 kg m s-1 will be ... [ Pb CET 1998]
-
75%
a) 0.002 Ao
-
25%
b)0.5 Ao
-
0%
c)2.0 Ao
-
0%
d)500 Ao
Explanation
Q.38.
Two particles A and B are in motion. if the wavelength associated with the particle A is 5.0 ×10-8 m, the wavelength of particle B having momentum half of A is
-
20%
a) 2.5×10-8 m
-
40%
b) 1.25×10-8 m
-
40%
c) 1.0×10-7 m
-
0%
d) 1.0×10-8 m
Explanation
Q.39.
For which of the following species, Bohr's theory is not applicable? [ DEC 2000]
-
17%
a)Be3+
-
0%
b) Li2+
-
67%
c)He2+
-
17%
d)H
Explanation
Q.40.
Chloride ion and potassium ion are isoelectronic then [ KCET 2002]
-
0%
a) their size are same
-
60%
b) Chloride ion is bigger than potassium ion
-
40%
c)potassium ion is relatively bigger
-
0%
d)depends upon the other cation or anion
Q.41.
The wave number of first line of Balmaer series of hydrogen is 15200 cm-. The wave number of first Balmaer line of Li2+ ion is ..[ IIT 1992]
-
33%
a)15200 cm-1
-
17%
b) 60800 cm-1
-
17%
c)76000 cm-1
-
33%
d)136800 cm-1
Q.42.
In the Bohr's orbit, what is the ratio of total kinetic energy and total energy of the electrons ... [ Rajasthan PMT 2002]
-
0%
a) -1
-
33%
b) -2
-
67%
c) +1
-
0%
d) +2
Explanation
Q.43.
Identify the least stable among the following ... [ IIT 2002]
-
0%
a)Li-
-
25%
b) Be-
-
75%
c)B-
-
0%
d)C-
Explanation
Q.44.
In a Bohr's atomic model, when an electron jumps from n=3 to n=1 how much energy will be emitted? [ CBSE PMT 1996]
-
50%
a) 2.15 ×10-11 ergs
-
25%
b) 2.389 ×10-12 ergs
-
0%
c)0.239 ×10-10 erg
-
25%
d)0.1936 ×10-10 erg
Q.45.
The work function of a metal is 4.2eV. If radiations of 2000Ao fall on the metal then the kinetic energy of the fastest photo electron is
-
20%
a) 1.6 ×10-19 J
-
20%
b) 16 ×1010 J
-
40%
c)3.2 ×10-19 J
-
20%
d)6.4 × 10-10 J
Explanation
Q.46.
An electron moving with velocity 'v' is found to have a certain value of de-broglie wave length. the velocity to be possessed by the neutron to have the same de-Broglie wave length is ...
-
20%
a) 1840/v
-
0%
b) 1840v
-
60%
c) v/1840
-
20%
d) v
Explanation
Q.47.
Which of the following atom has no neutron in its nucleus? [ CPMT 2000]
-
0%
a)Helium
-
0%
b) Lithium
-
86%
c)Protium
-
14%
d)Tritium
Q.48.
The frequency of yellow light having wavelength 600nm is ... [MPPMT 2002]
-
0%
a) 5.0 ×1014Hz
-
75%
b) 2.5 ×107 Hz
-
0%
c)5 ×107 Hz
-
25%
d)2.5 × 1014 Hz
Q.49.
The energy of the first electron in helium will be ...[ Bihar CEE 2002]
-
33%
a) -13.6 eV
-
0%
b) -54.4 eV
-
33%
c)-5.44 eV
-
33%
d)zero
Explanation
Q.50.
The wavelength associated with golf ball weighing 200g and moving at speed of 5m/h is of the order... [ IIT 2001]
-
20%
a) 10-10 m
-
20%
b) 10-20 m
-
40%
c) 10-30 m
-
20%
d) 10-40 m
Explanation
