**Q1. The ground state electron configuration of Fe is:**

- 1s
^{2}2s^{2 }3s^{2}3p^{6 }3d^{10} - 1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{8} - 1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2} - 1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2 }3d^{6}

**Answer :- ()**

**Q2. The energy of a photon of light has what kind of proportionality to its frequency and its wavelength?**

- directly, directly
- inversely, inversely
- inversely, directly
- directly, inversely

**Answer :- ()**

**Q3. The de Broglie wavelength of a tennis ball of mass 50 g moving with a velocity of 10 m/s is approximately**

- 0.132 x 10
^{-30}m - 0.132 x 10
^{-20}m - 0.132 x 10
^{-22}m - 0.132 x 10
^{-32}m

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**Q4. The ejected electrons from the surface of metal in photoelectric effect are called**

- Electron
- Photoelectrons
- Proton
- Neutron

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**Q5. Which of the subshells below do not exist due to the constraints upon the azimuthal quantum number?**

- 2d
- 2s
- 2p
- 4d

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**Q6. Which statement regarding an orbital is FALSE?**

- An orbital is three dimensional.
- An electron shell consists of a collection of orbitals with the same principal quantum number.
- An orbital may be designated with the letters K,L,M,N.
- An orbital describes the region in which the possibility of finding an electron is maximum.

**Answer :- ()**

**Q7.The charge on electron was determined by**

- Bohr
- Milliken
- Schrodinger
- Crooks

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**Q8. Which of the following is a possible electronic configuration?**

- 1s
^{2 }2s^{3 }2p^{6} - 1s
^{2 }2s^{2 }2p^{6 }3s^{2 }3p^{8 }3d^{7} - 1s
^{2 }2s^{2 }2p^{6 }3s^{2 }3d^{12} - 1s
^{2 }2s^{2 }2p^{6 }3s^{2 }3p^{4}

**Answer :- ()**

**Q9. Quantum mechanics is based on a fundamental equation which is called**

- Newton’s law
- Schrodinger equation
- Equation of state
- Boyle’s law

**Answer :- ()**

**Q10. De Broglie proposed that –**

- Matter consists of microscopic particles
- Matter should exhibit particle nature Only
- Matter should exhibit both particle and wave nature
- Matter consists of microscopic paricles

**Answer :- ()**

**Q11. Which of the following sets of orbitals is arranged in order of increasing energy?**

- 3d < 4s < 4p < 5s < 4d
- 4s < 3d < 4p < 5s < 4d
- 4s < 3d < 4p < 5s < 4d
- 3d < 4s < 4p < 4d < 5s

**Answer :- ()**

**Q12. The total energy of an electron in the n ^{th} orbit of a hydrogen atom is given by the formula E_{n} = -13.6 eV/n^{2}. What does the negative energy for an electron indicate?**

- Electrons have both wave and particle-like properties.
- The electron has a negative charge.
- The electron is far away from nucleus.
- Energy of electron in an atom is lower than the energy of an electron far away from nucleus.

**Answer :- ()**

**Q13. The uncertainty principle states that**

- It is impossible to determine mass of light particles
- It is impossible to know anything with certainty
- It is impossible to know the exact position and momentum of an electron simultaneously
- There can only be one uncertain digit in a reported number

**Answer :- ()**

**Q14. The fundamental subatomic particle neutron was discovered by**

- Rutherford
- Max Planck
- Heisenberg
- Chadwick

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**Q15. For Balmer series, the initial state n _{1} is:**

- 1
- 2
- 3
- 4

**Answer :- ()**

**Q16. The shape of the p _{x} orbital is:**

- Spherical
- Octahedral
- Dumb-bell
- Double Dumb-bell

**Answer :- ()**

**Q17. What is the wavelength of a photon that has energy of 5.25 x 10 ^{-19}J?**

- 3.79 x 10
^{-7} - 2.64 x 10
^{6} - 2.8 x 10
^{23} - 4.21 x 10
^{-24}

**Answer :- ()**

**Q18. In the absorption spectrum, the wavelengths which are absorbed are missing and they appear as**

- Bright lines
- Dark lines
- Bright bands
- Light bands

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**Q19. Calculate the value of principal quantum number for the subshell notation 3p?**

- 1
- 2
- 3
- 4

**Answer :- ()**

**Q20. Which of the following subatomic particles is responsible for the spectrum of radiation emitted by an element or a compound?**

- Proton
- Electron
- Neutron
- Photon

**Answer :- ()**

**Q21. A proton and an electron are both travelling at the same speed. What can we conclude about their de Broglie wavelengths?**

- It is impossible to determine the relative sizes of their wavelengths from the information given.
- They will both have the same wavelength.
- The wavelength of the proton will be shorter than that of the electron.
- The wavelength of the electron will be shorter than that of the proton.

**Answer :- ()**

**Q22. Total number of orbitals in a shell is given by**

- n
^{3} - 3n
^{2} - n
^{2} - n
^{4}

**Answer :- ()**

**Q23. For l = 2, how many orbitals are possible?**

- 1
- 2
- 3
- 5

**Answer :- ()**

**Q24. What is incorrect about electromagnetic radiations?**

- They require a medium to travel
- They can travel in vacuum
- Oscillating electric and magnetic fields are perpendicular to each other
- Oscillating electric and magnetic fields are perpendicular to the direction of propagation of the wave

**Answer :- ()**

**Q25. How much energy is needed to ionize a hydrogen atom if electron is present in n=1 orbit?**

- 13.6 eV
- 10.2 eV
- 3.4eV
- 1 eV

**Answer :- ()**

**Q26. A sub shell with l = 2 can take up a maximum of:**

- 5 electrons
- 3 electrons
- 8 electrons
- 10 electrons

**Answer :- ()**

**Q27. Which one of the following represents a wrong set of quantum numbers for an electron in an atom? (arranged as n, l, m, and s)**

- 2, 1, -1, -1/2
- 1, 0, 0, ±1/2
- 3, 3, 3, ±1/2
- 5, 4, – 3, +1/2

**Answer :- ()**

**Q28. The Pauli exclusion principle states that:**

- Both the position of an electron and its momentum cannot be known simultaneously very accurately.
- The wavelength and mass of a subatomic particle are related by I = h/m v
- The wavelength of a photon of light times its frequency is equal to the speed of light.
- No two electrons in the same atom can have the same set of four quantum numbers.

**Answer :- ()**

**Q29. Which one of the following represents an acceptable possible set of quantum numbers (in the order n, l, m _{l }and m_{s }for an electron in an atom?**

- 2, 1, -1, 1/2
- 2, 1, 0, 0
- 2, 1, 2, 1/2
- 2, 0, 1, -1/2

**Answer :- ()**

**Q30. If there are three electrons in p-subshell, which one of the following is the correct electronic configuration for these electrons?**

- p
_{x}^{2}p_{y}^{1}p_{z}^{0} - p
_{x}^{2}p_{y}^{0}p_{z}^{1} - p
_{x}^{0 }p_{y}^{1}p_{z}^{2} - p
_{x}^{1}p_{y}^{1}p_{z}^{1}

**Answer :- ()**

**Q31. Simultaneous determination of exact position and momentum of an electron is:**

- Possible
- Not possible
- Sometimes possible and sometimes impossible
- Momentum cannot be determined

**Answer :- ()**

**Q32. For the value of principal quantum number 3 the possible values for azimuthal quantum number will be:**

- 1,2,3
- 0,1,2,3
- 0,1,2
- -3,-2,-1,0,+1,+2,+3

**Answer :- ()**

**Q33. Which of the following set of quantum numbers represents the highest energy of an atom?**

- n=3, l=1, m=1, m
_{s}= +1/2 - n=3, l=2, m=1, m
_{s}= +1/2 - n=4, l=0, m=0, m
_{s}= +1/2 - n=3, l=0, m=0, m
_{s}= +1/2

**Answer :- ()**

**Q34. A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy of a single photon in this light?**

- 3.37 x 10
^{-19}Joules. - 1.12 x 10
^{-25}Joules. - 5.09 x 10
^{15}Joules. - 5.09 x 10
^{14}Joules.

**Answer :- ()**

**Q35. Uncertainty in the position of an electron (mass 9.1 x 10 ^{-31} kg) moving with a velocity of 300 ms^{-1}, accurate upto 0.001% will be:**

- 19.2 x 10
^{-2}m - 5.76 x 10
^{-2}m - 1.92 x 10
^{-2}m - 3.84 x 10
^{-2}m

**Answer :- ()**

**Q36. Which one of the following electronic configurations depict an oxygen atom?**

- 1s
^{2}2s^{2}2p^{2} - 1s
^{2}2s^{2}2p^{2}3s^{2} - 1s
^{2}2s^{2}2p^{1} - 1s
^{2}2s^{2}2p^{4}

**Answer :- ()**

**Q37. Which one of the following orbitals can hold only two electrons?**

- 2p
- 3s
- 4d
- 5f

**Answer :- ()**

**Q38. Which quantum numbers must be the same for the orbitals so that they are designated to be degenerate in a one-electron system (like hydrogen)?**

- n and m
- n and l only
- l and m
- m only

**Answer :- ()**

**Q39. What is the frequency of a photon that has an energy of 3.7 x 10 ^{-18}J?**

- 5.6 x 10
^{15} - 1.8 x 10
^{-16} - 2.5 x 10
^{-15} - 0.55 X 10
^{+16}

**Answer :- ()**

**Q40. At what speed (m/s) must a 3.0 mg object be moving in order to have a de Broglie wavelength of 5.4 x 10 ^{-29} m?**

- 4.1
- 2.0 x 10
^{12} - 3.9 x 10
^{-4} - 1.6 x 10
^{-28}

**Answer :- ()**