Q.1.
MAximum number of electrons present in 'N' shell .... [ EAMCET 1984]
-
0%
a)18
-
67%
b) 32
-
17%
c)2
-
17%
d)8
Q.2.
When alpha particles are sent through a thin metal foil, most of them go straight through the foil because ... [ IIT 1994]
-
22%
a) alpha particles are mush heavier than electron
-
11%
b) alpha particles are positive charged
-
33%
c)alpha particles move with high velocity
-
33%
d)most part of atom is empty
Q.3.
Which of the following is not correct for electronic distribution in the ground state [ AIIMS 1982]
-
0%
a)
-
14%
b)
-
43%
c)
-
43%
d)
Q.4.
the ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is [ NCERT1980]
-
17%
a) 1:2
-
17%
b) 1:3
-
50%
c) 4:9
-
17%
d) 27:5
Q.5.
The volume of nucleus is about [ eamcet 1986]
-
29%
a)10-15 times that of atom
-
14%
b) 10-10 times that of atom
-
29%
c)10-15 times that of atom
-
29%
d)10-20 times that of atom
Q.6.
Which one of the following sets of quantum numbers represents an impossible arrangement? [ IIT 1986]
-
14%
a) n=3, l=2, ml=-2, ms=1/2
-
57%
b) n=4, l=0, ml=0, ms=1/2
-
14%
c)n=3, l=2, ml=-2, ms=1/2
-
14%
d)n=5, l=3, ml=0, ms=1/2
Q.7.
Remaining part of atom except outer orbit is called [ CPMT 1982]
-
38%
a)Kernel
-
25%
b) Core
-
38%
c)Empty space
-
0%
d)None
Q.8.
How many unpaired electrons are there in NI2+ [ IIT 1981]
-
0%
a) 0
-
17%
b) 2
-
83%
c) 4
-
0%
d) 8
Q.9.
Which quantum number is sufficient to describe the electron in hydrogen atom .... [ CPMT 1984]
-
0%
a)l
-
25%
b) n
-
0%
c)m
-
75%
d)s
Q.10.
The symbol of the element whose atoms have the outer most electronic configuration 2s2, 2p3 is ... [ EAMCET 1983]
-
67%
a) N
-
0%
b) Li
-
33%
c)P
-
0%
d)Na
Q.11.
The maximum number of electrons in p-orbital with n=0 and m=0 is [ EAMCET 1981]
-
29%
a) 2
-
57%
b) 6
-
14%
c)10
-
0%
d)14
Q.12.
The ratio of the radii of the first three Bohr orbits is [ NCERT 1980]
-
0%
a) 1:0.5:0.33
-
0%
b) 1:2:3
-
67%
c) 1:4:9
-
33%
d) 1:8:27
Q.13.
The atomic weight of an element is 23 and atomic number isThe number of protons, electrons and neutrons respectively present in the atom of the element are [ AFMC 89]
-
17%
a)11, 11, 12
-
33%
b) 12, 12, 11
-
0%
c)11,12, 11
-
50%
d)12,11,12
Q.14.
The number of unpaired electrons in Cr+3 ( atomic number 24) is [ MLNR 1986]
-
0%
a) 6
-
50%
b) 4
-
25%
c)3
-
25%
d)1
Q.15.
Cathode rays are deflected by ..... [ CPMT 1982]
-
33%
a) an electric filed only
-
0%
b) a magnetic field only
-
33%
c)by both
-
33%
d)by none
Q.16.
Rutherford's experiment on scattering of particles showed for the first time that the atom has [ IIT1981]
-
20%
a) Electrons
-
20%
b) Protons
-
40%
c) Nucleus
-
20%
d) Neutrons
Q.17.
As we move away from nucleus, the energy of orbit .... [ DPMT 1984]
-
57%
a)Decreases
-
14%
b) Increases
-
14%
c)remains uncharged
-
14%
d)none of these
Q.18.
The spectrum of He is expected to be similar to that of [ AIIMS 1980]
-
17%
a) H
-
50%
b) L+
-
0%
c)Na
-
33%
d)He+
Q.19.
The value of Plank's constant is .... [ EAMCET 1983]
-
60%
a) 6.6256 ×10-27 erg sec
-
20%
b) 66.256 × 10-27 erg sec
-
0%
c) 6.02 ×10-15 erg
-
20%
d) 3.01 ×10-23 erg
Q.20.
The triad of nuclei which is isotonic is ... [ IIT 1988]
-
25%
a)6C14, 7N15, 9F17
-
50%
b)6C12, 7N14, 9F19
-
25%
c)6C14, 7N14, 9F17
-
0%
d)6C14, 7N14, 9F19
Q.21.
The number of spherical nodes in 3p orbitals are ... [ CBSE PMT 1988]
-
40%
a) one
-
0%
b) three
-
40%
c)two
-
20%
d)four
Q.22.
The radius of second Bohr's orbital is ... [ BHU 1989]
-
0%
a) 0.053nm
-
50%
b) 0.0534/4 nm
-
33%
c)0.053 ×4 nm
-
17%
d)0.053 ×20 nm
Q.23.
If the mass number of an element is W and its atomic number is N, then [ CPMT 1989]
-
0%
a) Number of e-1=W-N
-
40%
b) Number of 1H1=W -N
-
60%
c) Number of 0n=W -N
-
0%
d) Number of 0n1=N
Q.24.
Number of electrons in the outermost orbit of the element of atomic number 15 is ... [ CPMT 1988]
-
0%
a)7
-
60%
b) 5
-
40%
c)3
-
0%
d)2
Q.25.
The maximum number of electrons in a subshell is given by the expression [ CBSE PMT 1989]
-
0%
a) 4l-2
-
33%
b) 4l+2
-
33%
c)2l+1
-
33%
d)2n2
Q.26.
An orbit with quantum number n=4 , l=3, m=0, and s=-(1/2) is called [ Pb. CET sample paper 1990]
-
20%
a) 3s orbital
-
20%
b) 3p orbital
-
0%
c)4d orbital
-
60%
d)4f orbital
Q.27.
Which of the following is correct in case of p-orbitals? [ EAMCET 1990]
-
0%
a) They are spherical
-
100%
b) They have strong directional character
-
0%
c) They have no directional character
-
0%
d) They are five fold degenerate
Q.28.
If r is the radius of first orbit, the radius of nth orbit of H-atom is given by .... [ CBSE PMT 1988]
-
67%
a)rn2
-
17%
b) rn
-
17%
c)r/n
-
0%
d)r2n2
Q.29.
Indicate which electronic configuration amongst the following correctly represents sulphur atom [ BIT Ranchi 1989]
-
0%
a) 1s2 2s2 2p6 3s2 3p2 3d2
-
20%
b)1s2 2s2 2p6 3s2 3p2 4s2
-
0%
c)1s2 2s2 2p6 3s2 3p6 4s14p1
-
80%
d)1s2 2s2 2p6 3s2 3p4
Q.30.
If the speed of electron in the Bohr's first orbit of hydrogen atom be x, then speed of the electron in the 3rd orbit is .... [ IIT 1990]
-
40%
a) x/9
-
40%
b) x/3
-
0%
c)3x
-
20%
d)9x
Q.31.
Spectrum produced due to transition of an electron from M to L shell is ... [ AFMC 1990]
-
80%
a) absorption
-
20%
b) emission
-
0%
c) X-ray
-
0%
d) continuous
Q.32.
The orbital diagram in which aufbau principle is violated is
-
0%
a)
-
60%
b)
-
20%
c)
-
20%
d)
Q.33.
Number of electrons in -CONH2 is .. [ AMU 1988]
-
17%
a) 22
-
67%
b) 24
-
17%
c)20
-
0%
d)28
Q.34.
In a set of degenerate orbitals, the electron distribute themselves to retain like spins as far as possible. This statement is attributed to [ Pb. CET 1989]
-
17%
a) Pauli exclusion principle
-
17%
b) Aufbau principle
-
50%
c)Hand's rule of maximum multiplicity
-
17%
d)Slater rules
Q.35.
Which of the following statements concerning the four quantum numbers is false [ Pb. CET 1990]
-
50%
a) n gives idea of the size of an orbital
-
25%
b) l gives the shape of an orbital
-
25%
c) m gives the energy of the electron in the orbital
-
0%
d) s gives the direction of spin of the electron in the s-orbit
Q.36.
The electron in K-shell of the atom will differ in ....{MLNR 1988]
-
33%
a)principal quantum number
-
33%
b) azimuthal quantum number
-
17%
c)magnetic quantum number
-
17%
d)spin quantum number
Q.37.
An ion has 18 electrons in the outermost shell, it is ... [CBSE PMT 1990]
-
25%
a) Cu+
-
0%
b) Th4+
-
50%
c)Cs+
-
25%
d)K+
Q.38.
If the atomic number of nickel and copper are 28 and 29 respectively, which of the following does the electric configuration 1s2 2s2 2p6 3s2 3p6 3d10 represent [ Pb. CET 1988]
-
20%
a)Cu+
-
7%
b) Cu2+
-
20%
c)Ni2+
-
53%
d)Ni
Q.39.
Which of the following statement does not form a part of Bohr's model of hydrogen atom [ CBSE PMT 1989]
-
22%
a) Energy of the electrons in the orbits is quantized
-
11%
b) The electron in the orbit nearest the nucleus has lower energy
-
22%
c) Electrons revolve in different orbits around the nucleus
-
44%
d) The position and velocity of the electrons in the orbit cannot be determined simultaneously
Q.40.
The size of nucleus is measured in ....[EAMCET 1988]
-
17%
a)amu
-
17%
b) Angstrom
-
50%
c)Fermi
-
17%
d)cm
Q.41.
Which of the sets of quantum numbers is impossible? [ Pb.CET 1989]
-
50%
a) n=3, l=0, m=-1
-
0%
b) n=3, l=2, m=+1
-
0%
c)n=3, l=1 m=-1
-
50%
d)n=3, l=2,m=0
Q.42.
How many spherical nodes are present in 4s orbital in hydrogen atom? [ Pb. CET 1990]
-
33%
a) 0
-
0%
b) 1
-
33%
c)2
-
33%
d)3
Q.43.
The ratio between the neutrons in C and Si with respect to atomic masses 12 and 28 is .... [ EAMCET 1990]
-
0%
a) 2:3
-
33%
b) 3:2
-
33%
c) 3:7
-
33%
d) 7:3
Q.44.
When the value of the azimuthal quantum number is 3, the magnetic quantum number can have values [ MP PMT 1987]
-
0%
a)+1, -1
-
0%
b) +1, 0, -1
-
0%
c)+2, +1, 0, -1, -2
-
100%
d)+3, +2, +1, 0, -1, -2, -3
Q.45.
Mass of the neutron is of the order of ... [ MLNR 1988]
-
0%
a) 10-23 kg
-
50%
b) 10-24 kg
-
25%
c)10-26 kg
-
25%
d)10-27 kg
Q.46.
If electron has spin quantum number of +1/2 and magnetic quantum number -1, it cannot be present in [ CBSE PMT 1989]
-
0%
a) d-orbital
-
67%
b) f-orbital
-
33%
c)p-orbital
-
0%
d)s-orbital
Q.47.
The magnetic quantum number represents...... [ MLNR 1990]
-
0%
a) size of the orbital
-
0%
b) spin angular momentum
-
0%
c) orbital angular momentum
-
100%
d) spatial orientation of orbital
Q.48.
The total spin resulting from a d7 configuration is .... [ Pb CET 1989]
-
33%
a)3/2
-
33%
b) 1/2
-
33%
c)2
-
0%
d)1
Q.49.
The correct set of quantum number for the unpaired electron of chlorine atom is [ JIPMER 1994]
-
20%
a) n=2, l=1, m=0
-
0%
b) n=2, l=1, m=1
-
40%
c)n=3, l=1, m=-1
-
40%
d)n=3, l=0, m=0
Q.50.
on Q351) The energy of an orbit in hydrogen atom is given by the relationWhich of the following properties represents the constant in the above relation? [Pb CET 1990]
-
0%
a) Electron affinity
-
83%
b) Ionization energy
-
0%
c)Electronegativity
-
17%
d)Bond energy