Atomic Structure - NEET/JEE /KEAM
Each correct answer have 4 Marks Each wrong answers have -1 Mark Time - 15 Minutes ( 15 Questions )
- 1.If the energy of a proton is given as 3.03 × 10-19 J then, the wave length of the photon is:
- A.
6.56nm
- B.
65.6 nm
- C.
656 nm
- D.
0.656 nm
- 2.In the photo-electron emission, the energy of the emitted electron is
- A.
Greater than the incident photon
- B.
Same as than of the incident photon
- C.
Smaller than incident photon
- D.
Proportional to the intensity of incident photon
- 3.The electron was shown experimentally to have wave properties by
- A.
De Broglie
- B.
Davisson and Germer
- C.
N. Bohr
- D.
Schrodinger
- 4.Which of the following is never true for cathode rays?
- A.
They possess kinetic energy
- B.
They are electromagnetic waves
- C.
They produce heat
- D.
They produce mechanical pressure
- 5.According to the Bohr theory, which of the following transmissions in the hydrogen atom will give rise to the least energetic photon?
- A.
N= 6 to n=1
- B.
N=5 to n= 4
- C.
N= 6 to n= 5
- D.
N= 5 to n=3
- 6.In hydrogen atom, energy of first excited state is -3.4 eV. Find out KE of the same orbit of Hydrogen atom
- A.
+3.4 eV
- B.
+6.8 eV
- C.
-13.6 eV
- D.
+13.6 eV
- 7.According to Bohr's theory the energy required of for an electron in the Li2+ ion to be emitted from n= 2 state is (given that the ground state ionization energy of hydrogen atom is 13.6 eV)
- A.
61.2 eV
- B.
13.6 eV
- C.
30.6 eav
- D.
10.2 eV
- 8.The Bohr orbit radius for the hydrogen atom(n=1) is approximately 0.530 A. The radius for the first excited state (n=2) orbit is (in A)
- A.
0.13
- B.
1.06
- C.
4.77
- D.
2.12
- 9.The radius of hydrogen atom in the ground state is 0.53 A. The radius of Li2+ ion (atomic number= 3) in a similar state is,
- A.
0.17 A
- B.
0.265 A
- C.
0.53 A
- D.
1.06 A
- 10.If ionization potential for hydrogen atom is 13.6 eV, then ionization potential for He+ will be,
- A.
54.4 eV
- B.
6.8 eV
- C.
13.6 eV
- D.
24.5 eV
- 11.If r is the radius of the first orbit, the radius of nth orbit of H- atom is given by
- A.
Rn2
- B.
Rn
- C.
R/n
- D.
R2n2
- 12.The spectrum of He is expected to be similar to that
- A.
H
- B.
Li+
- C.
Na
- D.
He+
- 13.Two electrons occupying the same orbital are distinguished by
- A.
Principal quantum number
- B.
Magnetic quantum number
- C.
Azimuthal quantum number
- D.
Spin quantum number
- 14.The correct set of four quantum numbers for the valence electron of rubidium atom (Z= 37) is,
- A.
5,1,+1/2
- B.
6,0,0 +1/2
- C.
5,0,0 +1/2
- D.
5,1, 0 +1/2
- 15.The total number of atomic orbitals in fourth energy level of an atom is:
- A.
8
- B.
16
- C.
32
- D.
4
Questions: 37 | Attempts: 327 | Last updated: Jan 18, 2013
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