Q1. The ground state electron configuration of Fe is:
- 1s2 2s2 3s2 3p6 3d10
- 1s2 2s2 2p6 3s2 3p6 3d8
- 1s2 2s2 2p6 3s2 3p6 4s2
- 1s2 2s2 2p6 3s2 3p6 4s2 3d6
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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
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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.
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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?
- 1s2 2s3 2p6
- 1s2 2s2 2p6 3s2 3p8 3d7
- 1s2 2s2 2p6 3s2 3d12
- 1s2 2s2 2p6 3s2 3p4
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Q9. Quantum mechanics is based on a fundamental equation which is called
- Newton’s law
- Schrodinger equation
- Equation of state
- Boyle’s law
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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
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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
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Q12. The total energy of an electron in the nth orbit of a hydrogen atom is given by the formula En = -13.6 eV/n2. 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.
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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
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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 n1 is:
- 1
- 2
- 3
- 4
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Q16. The shape of the px orbital is:
- Spherical
- Octahedral
- Dumb-bell
- Double Dumb-bell
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Q17. What is the wavelength of a photon that has energy of 5.25 x 10-19J?
- 3.79 x 10-7
- 2.64 x 106
- 2.8 x 1023
- 4.21 x 10-24
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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
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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
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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.
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Q22. Total number of orbitals in a shell is given by
- n3
- 3n2
- n2
- n4
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Q23. For l = 2, how many orbitals are possible?
- 1
- 2
- 3
- 5
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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
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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
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Q26. A sub shell with l = 2 can take up a maximum of:
- 5 electrons
- 3 electrons
- 8 electrons
- 10 electrons
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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
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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.
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Q29. Which one of the following represents an acceptable possible set of quantum numbers (in the order n, l, ml and ms 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
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Q30. If there are three electrons in p-subshell, which one of the following is the correct electronic configuration for these electrons?
- px2 py1 pz0
- px2 py0 pz1
- px0 py1 pz2
- px1 py1 pz1
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Q31. Simultaneous determination of exact position and momentum of an electron is:
- Possible
- Not possible
- Sometimes possible and sometimes impossible
- Momentum cannot be determined
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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
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Q33. Which of the following set of quantum numbers represents the highest energy of an atom?
- n=3, l=1, m=1, ms = +1/2
- n=3, l=2, m=1, ms= +1/2
- n=4, l=0, m=0, ms= +1/2
- n=3, l=0, m=0, ms= +1/2
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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 1015 Joules.
- 5.09 x 1014 Joules.
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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
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Q36. Which one of the following electronic configurations depict an oxygen atom?
- 1s22s22p2
- 1s22s22p23s2
- 1s22s22p1
- 1s22s22p4
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Q37. Which one of the following orbitals can hold only two electrons?
- 2p
- 3s
- 4d
- 5f
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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
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Q39. What is the frequency of a photon that has an energy of 3.7 x 10-18J?
- 5.6 x 1015
- 1.8 x 10-16
- 2.5 x 10-15
- 0.55 X 10+16
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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 1012
- 3.9 x 10-4
- 1.6 x 10-28
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