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The work function of a metal is 4.2 eV. If radiations of 2000 $A^0$ fall on the metal then the kinetic energy of the fastest photoelectron is 
1. 1.6 x 10^-19J 
2. 16 x 10¹⁰J 
3. 3.2 x 10^-19J 
4. 6.4 x 10^-10J 

A cricket ball of 0.5 kg is moving with a velocity of 100 ms^-1. The wavelength associated with its motion is:
1. 1/100cm
2. 6.6 x 10^-34m
3. 1.32 x 10^-35m
4. 6.6 x 10^-28m

The radius of second stationary orbit in Bohr's atom is R. The radius of 3^rd orbit will be:-
1. 9R
2. R/4
3. 9R/4
4. 2R

If the velocity of a particle is reduced to 1/3^rd, then percentage increase in its de-broglie wavelength will be:-
1. 100%
2. 200%
3. 50%
4. 33.33%

The maximum wavelength in the Lyman series of He⁺ ion is-
1. 3R
2. 1/3R
3. 1/R
4. 2R

 When an electron jumps from n=5 to n=1 in a hydrogen atom, the number of spectral lines obtained is 

Two electrons occupying the same orbital are distinguished by
(1) Magnetic quantum number
(2) Azimuthal quantum number
(3) Spin quantum number
(4) Principal quantum number

The number of d-electrons in Fe²⁺ (Z=26) is not equal to the number of electrons in
which one of the following?
1. s-electrons in Mg (Z=12)
2. p-electrons in Cl (Z=17)
3. d-electrons in Fe (Z=26)
4. p-electrons in Ne (Z=10)

Which is the correct order of increasing energy of the listed orbitals in the atom of
titanium?
1. 3s 4s 3p 3d                   
2. 4s 3s 3p 3d
3. 3s 3p 3d 4s                   
4. 3s 3p 4s 3d

Calculate the energy in Joule corresponding to light of wavelength 45 nm : (Planck's
constant h = 6.63 x 10^-34 Js; speed of light c = 3 x 10⁸ ms^-1)
1. 6.67 x 10¹⁵                             
2. 6.67 x 10¹¹
3. 4.42 ^x10-15                             
4. 4.42 x 10^-18

Magnetic moment of 2.83 BM is given by which of the following ions?
(At no: Ti=22; Cr=24; Mn=25; Ni=28)
1. Ti³⁺                 
2. Ni²⁺
3. Cr³⁺                 
4. Mn²⁺

The value of Planck's constant is 6.63 x 10^-34 Js. The speed of light is 3 x 10¹⁷ nms^-1.
Which value is closest to the wavelength in nanometer of a quantum of light with the
frequency of 6 x 10¹⁵ s^-1?
1. 10
2. 25
3. 50
4. 75

If the principal quantum number n=6, the correct sequence of filling of electrons will be:

Which one of the elements with the following outer orbital configurations may exhibit the
largest number of oxidation states ?
1. 3d³, 4s²
2. 3d⁵, 4s¹
3. 3d⁵, 4s²
4. 3d², 4s²

Maximum number of electrons in a subshell of an atom can be determined by which of the following formula :
1. 4l + 2
2. 2l + 1
3. 4l - 2
4. 2n²