The energy of light of wavelength 45 nm is _____________.

(a)

6.67 x 10¹⁵J

(b)

6.67 x 10¹¹J

(c)

4.42 x 10^-18J

(d)

4.42 x 10^-15J

The energies E₁and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie \(\lambda \)₁ and\(\lambda \)₂ will be ___________

(a)

\(\frac { { \lambda }_{ 1 } }{ { \lambda }_{ 2 } } =1\)

(b)

\({ \lambda }_{ 1 }=2{ \lambda }_{ 2 }\)

(c)

\({ \lambda }_{ 1 }=\sqrt { 25\times 50{ \lambda }_{ 2 } } \)

(d)

\(2{ \lambda }_{ 1 }={ \lambda }_{ 2 }\)

Splitting of spectral lines in an electric field is called _____________

(a)

Zeeman effect

(b)

Shielding effect

(c)

Compton effect

(d)

Stark effect

The electronic configuration of Eu (Atomic no. 63) Gd (Atomic no. 64) and Tb (Atomic no. 65) are ____________

(a)

[Xe] 4f⁶ 5d¹ 6s², [Xe] 4f⁷ Sd¹ 6s² and [Xe] 4f⁸  5d¹ 6s²

(b)

[Xe] 4f⁷ , 6s², [Xe] 4f⁷ 5d¹ 6s² and [Xe] 4f⁹ 6s²

(c)

[Xe] 4f⁷ ,6s², [Xe] 4f⁸ 6s² and [Xe] 4f⁸ 5d¹ 6s²

(d)

[Xe] 4f⁶ 5d¹ 6s², [Xe] 4f⁷ 5d¹ 6s² and [Xe] 4f⁹ 6s²

Two electrons occupying the same orbital are distinguished by ___________

(a)

azimuthal quantum number

(b)

spin quantum number

(c)

magnetic quantum number

(d)

 orbital quantum number

For d-electron, the orbital angular momentum is ___________

(a)

\(\frac { \sqrt { 2 } h }{ 2\pi } \)

(b)

\(\\ \frac { \sqrt { 2h } }{ 2\pi } \)

(c)

\(\frac { \sqrt { 2\times 4 } h }{ 2\pi } \)

(d)

\(\frac { \sqrt { 6 } h }{ 2\pi } \)

How many nodes are possible for 2s orbital?

(a)

1

(b)

2

(c)

3

(d)

zero

Which one of the following orbitals is spherical in shape?

(a)

4s

(b)

3p

(c)

3d

(d)

4f

Which of the following has maximum number of unpaired d-electrons?

(a)

N³⁺

(b)

Fe²⁺

(c)

Zn⁺

(d)

Cu⁺

How many electrons in an atom with atomic number 105 can have (n + 1) = 8 ? 

(a)

30

(b)

17

(c)

15

(d)

unpredictable

Electron density in the yz plane of 3d_xy orbital is ___________

(a)

zero

(b)

 0.50

(c)

0.75

(d)

 0.90

If uncertainty in position and momentum are equal, then minimum uncertainty in velocity is _________

(a)

\(\frac { 1 }{ m } \sqrt { \frac { h }{ \pi } } \)

(b)

\( \sqrt { \frac { h }{ \pi } } \)

(c)

\(\frac { 1 }{ 2m } \sqrt { \frac { h }{ \pi } } \)

(d)

\( { \frac { h }{4\pi } } \)

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

(a)

\(\triangle x.\triangle p\ge \frac { h }{ 4\pi } \)

(b)

\(\triangle x.\triangle v\ge \frac { h }{ 4\pi m } \)

(c)

\(\triangle E.\triangle t\ge \frac { h }{ 4\pi } \)

(d)

\(\triangle E.\triangle x\ge \frac { h }{ 4\pi } \)

J. J. Thomson's cathode ray experiment revealed that atoms consist of _____________

(a)

electrons

(b)

protons

(c)

neutrons

(d)

photons

The nucleus of an atom contains 

(a)

Electrons and protons

(b)

Neutrons and protons

(c)

Electrons, protons and neutrons

(d)

Neutrons and electrons

The atomic number of an element is 17 and its mass number is 37. The number of protons, electrons and neutrons present in the  neutral atom are __________

(a)

17,37,20

(b)

20,17,37

(c)

17,17,20

(d)

17,20,17

(e)

37,20,17.

Mass number is equal to the ________

(a)

number of protons + number of electrons

(b)

number of protons + number of neutrons

(c)

number of neutrons + number of electrons

(d)

number of electrons

The fixed circular paths around the nucleus are caused ____

(a)

orbits

(b)

Orbitals

(c)

nucleons

(d)

Mesons

Neutrons was discovered by ________

(a)

Rutherford

(b)

Chadwick

(c)

Bohr

(d)

Thomson

₆C¹⁴ and ₇N¹⁴ are _____________

(a)

isotones

(b)

isoelectronic

(c)

isobars

(d)

isotopes

Which of the following conclusions could not be derived from Rutherford's \(\alpha\)-particle scattering experiment? 

(a)

Most of the space in the atom is empty.

(b)

The radius of the atom is about 10^-10 m while that of the nucleus is 10^-15 m

(c)

 Electrons move in a circular path of fixed energy called orbits.

(d)

Nucleus and the electrons are held together by electrostatic force of attraction

Which of the following about the electron is incorrect?

(a)

It is a negatively charged particle.

(b)

The mass of electron is equal to the mass of neutron .

(c)

It is a basic constituent of all the atoms

(d)

electron mass = 9.10938356 x 10^-31kilograms

Which of the following properties of atom could be explained correctly by Thomson model of an atom?

(a)

Overall neutrality of atom.

(b)

Spectra of hydrogen atom.

(c)

Position of protons, electrons and neutrons in atom .

(d)

Stability of atom.

If E_n = -313.6/n2,If the value of E_i = -34.84 to which value 'n' corresponds __________

(a)

4

(b)

3

(c)

2

(d)

1

Dual character of an electron was explained by ____________

(a)

Bohr

(b)

Heisenberg

(c)

de-Broglie

(d)

Pauli

de-Broglie equation is __________

(a)

λ = mv/h

(b)

λ = hmv

(c)

λ = hv/m

(d)

λ = h/mv

The value of Bohr radius for hydrogen atom is ___________

(a)

0.529 \(\times\) 10^-8 cm

(b)

0.529 \(\times\) 10^-10 cm

(c)

0.529 \(\times\) 10^-12 cm

(d)

0.529 \(\times\) 10^-12 cm

Which of the following particle having same kinetic energy, would have the maximum de-Broglie wave length

(a)

α-particle

(b)

proton

(c)

β-particle

(d)

neutron

Electronic configuration of species M²⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ and its atomic weight is 56. The number of neutrons in the nucleus of species M is ________

(a)

26

(b)

22

(c)

30

(d)

24