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 /Ï€ Zme2     b. n2h2 εo /Ï€ Zme
c. n2h εo /Ï€ 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.  =  (Z-b)                     b.  = a (Z+b)
c.  = a (Z-b)                   d.
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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