# Atomic Structure - NEET/JEE /KEAM

15 Questions | Total Attempts: 47  Settings Create your own Quiz 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 Li​​​​​2+ 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 Li​​​​​2+ 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 n​​​th orbit of H- atom is given by
• A.

Rn​​​​​2

• B.

Rn

• C.

R/n

• D.

R​​​​​​2​​​n2

• 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.

• B.

16

• C.

32

• D.

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