CHAPTER NO.2 ATOMIC STRUCTURE
1.
|
Cathode
rays have momentum, it was discovered by
a.
Hittorf b.
Crooke
c.Pierre d. Thomson
|
B
|
2.
|
cathode
rays was discovered by
a.
Gold stein b. G.J
stoney
c.
Chadwich d. Non of
these
|
A
|
3.
|
The
e/m ratio for electron
a.
1.602 x 10-19 b. 9.11 x 10-31
c.
1.7588 x 10 11 d.
9.54 x 107
|
C
|
4.
|
Neutrons
can knock out high speed protons from
a.
Paraffin b.
Water
c.
Cellulose d. All
of these
|
D
|
5.
|
The
relation between radius and velocity of atom
a.
r α v b.
r α v2
c.
r α 1/v d. r
α 1/v2
|
D
|
6.
|
the
equation radius of an atom is given by
a.
r = n2h2 εo /π Zme2 b. n2h2 εo
/Ï€ Zme
c.
n2h εo /π Zme2 d. non of these
|
A
|
7.
|
Transition from n2 =2,3,4,5 etc to n1 =1 in
hydrogen spectrum gives
a.
Lyman b.
Balmer
c.
Paschan d.
Brackett
|
B
|
8.
|
Bohr’s
model can’t explain
a.
He+ b.
Li++
c.
Be+++ d.
Non of these
|
D
|
9.
|
X-rays
can be produced by
a.
Roentgen method b.
Coolidge method
c.
By Betatron method d. All of these
|
D
|
10.
|
The
x-rays can be
a.
Refelected b.
Refracted
c.
Diffracted d.
All of these
|
D
|
11.
|
Types
of x-rays are
a.
2 b.
3
c.
4 d.
5
|
B
|
12.
|
The
correct equation for Moseley’s law
a.
c.
|
C
|
13.
|
The
maximum number of electrons in principle quantum number is calculated by
a.
2n2 b.
2(2l+1)
c.
2l+1 d.
2n
|
A
|
14.
|
If
value of principle quantum number is 4, then value of Azimuthal quantum
number is
a.
1,2,3,4 b.
0,1,2,3
c.
0,1,2 d.
0,1,2,3,4
|
B
|
15.
|
If
the value of azimuthal quantum number is 2, then the number of magnetic
quantum number is
a.
1 b.
3
c.
5 d.
7
|
C
|
16.
|
Total
nodes =
a.
n-1 b.
n+2
c.
l d.
2n2
|
A
|
17.
|
Angular
nodes value is given by
a.
n-1 b.
l
c.
n-1-l d.
non of these
|
B
|
18.
|
The
maximum numbers of electrons in orbitals is
a.
2 b.
8
c.
18 d.
32
|
B
|
19.
|
No
two electrons in an atom can have the same set of four quantum numbers
a.
Aafbau principle
b.
Pauli’s exclusion principle
c.
Hund’s rule
d.
Non of these
|
B
|
20.
|
Which
one of the following have less energy
a.
3d b.
4s
c.
4p d.
4d
|
B
|
21.
|
……
determined charge on electron
a.
Millikan b.
J.J. Thomson
c.
Chadwick d.
Moseley
|
A
|
22.
|
What
will be the wave number of a radiation with λ = 2 x 108nm?
a.
100 n/m b. 5 n/m
c.
10 n/m d. 0.5
x 10-8 n/m
|
D
|
23.
|
The
frequency of green light is 6 x 1014 Hz. Its wavelength is
a.
5 nm b.
50 nm
c.
500 nm d.
5000 nm
|
C
|
24.
|
If
the mass of electron is doubled, the Rydberg’s constant
a.
Becomes half b.
Becomes double
c.
Remains unchanged d. Becomes one fourth
|
B
|
25.
|
For
which one of the following species, Bohr’s theory does not apply?
a.
H b.
H+
c.
He+1 d.Li+2
|
B
|
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