PPSC Chemistry Lecturer Preparation (Test # 02)- Malik Xufyan
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PPSC CHEMISTRY CLASS
Test Session
CH: Quantum Chemistry
Test # 02
For more WhatsApp # 0313-7355727
Topics:
1. Quantum Numbers
2. Eigen Function and Eigen Values
3. Degeneracy
4. Tunnelling Effect
Quantum Numbers
1. If the electronic structure of oxygen atom is written as 1s2 2s2 2p4 it would violate
(A) Hund’s rule
(B) Paulis exclusion principle
(C) Both Hund’s and Pauli’s principles
(D) None of these
2. How many orbitals can have the following quantum numbers, n = 3, l = 1, ml = 0?
(a) 4
(b) 2
(c) 1
(d) 3
3. What is the maximum number of electrons, which can have following quantum
numbers, n = 3, l = 1, m = -1?
(a) 2
(b) 6
(c) 10
(d) 4
4. The maximum number of electrons that can fit in an orbital with n = 3 and l = 1?
(a) 14
(b) 6
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(c) 10
(d) 2
5. The maximum number of electrons which can be present in a subshell can be
represented by
(a) 2l + 1
(b) 2n2
(c) 4l + 2
(d) 4l – 2
6. Which of the following quantum numbers governs the spatial orientation of an
atomic orbital?
(a) Magnetic quantum number
(b) Spin quantum number
(c) Azimuthal quantum number
(d) Principal quantum number
7. Which of the following quantum numbers tells the three-dimensional shape of an
atomic orbital?
(a) Azimuthal quantum number
(b) Principal quantum number
(c) Spin quantum number
(d) Magnetic quantum number
8. The maximum number of orbitals present in a subshell can be represented by
(a) 2l + 1
(b) 2n2
(c) 4l + 2
(d) 4l – 2
9. The maximum number of electrons that can fit in all the orbitals with n = 2 and l = 1?
(a) 8
(b) 2
(c) 6
(d) 4
10. The maximum number of electrons with l = 3 is
(a) 14
(b) 2
(c) 10
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(d) 6
11. Which of the following quantum numbers can distinguish between two electrons
present in the same orbital?
(a) Azimuthal quantum number
(b) Principal quantum number
(c) Magnetic quantum number
(d) Spin quantum number
12. Number of nodal planes for f-orbital are
(A) 3
(B) 2
(C) 1
(D) 0
13. One Bohr magneton equals
(A) ehc/4πn
(B) ec/4πhm
(C) hc/me4π
(D) eh/4πmc
14. An atom has four unpaired electrons. The total spin of this atom will be
(A) 1
(B) 1.5
(C) 2
(D) 4
15. Which of the following statements is incorrect about isolated, gaseous atoms?
a) For a C atom, the energies of the 2s and 2p atomic orbitals are different.
b) For an H atom, the energy of the 2s atomic orbital is lower than that of the 2p atomic
orbital.
c) For any atom, the three 2p atomic orbitals are degenerate.
d) For an O atom, the energy of the 1s atomic orbital is lower than that of the 2s atomic
orbital.
16. For a principal quantum number n, how many atomic orbitals are possible?
a) 2n
b) n
c) n2
d) n + 1
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17. Which set of quantum numbers uniquely defines one of the electrons in an atomic
orbital with n = 2 and l = 0?
a) n = 2, l = 0, m = 1, s = +½
b) n = 2, l = 0, m = 1, s = +1
c) n = 2, l = 0, m = 0, s = +1
d) n = 2, l = 0, m = 0, s = +½
18. How many radial nodes does a 4s orbital possess?
a) 4
b) 3
c) 2
d) 1
19. The frequency of a transition in the Lyman series is 2.466 × 1015 Hz. What is the
wavenumber of this transition?
a) 8.223 × 106
cm–1
b) 8.223 × 104
cm–1
c) 1.216 × 10–7
cm
d) 1.216 × 10–5
cm
20. How many valence electrons does an element with Z = 11 possess?
a) 4
b) 2
c) 3
d) 1
21. Which of the following corresponds to the Laporte selection rule?
a) Δn = +1 or –1
b) Δl = 0, +1 or –1
c) Δl = +1 or –1
d) Δn = 0, +1 or –1
22. What is the frequency of the 5 → 2 transition in the Balmer series? The Rydberg
constant is 3.289 × 1015 Hz.
a) .907 × 1016
Hz
b) 6.907 × 1014
Hz
c) 9.867 × 1015
Hz
d) 9.867 × 1014
Hz
23. A set of orbitals for which the quantum number l = 2 is:
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a) 5-fold degenerate.
b) 7-fold degenerate.
c) non-degenerate.
d) 3-fold degenerate.
24. For the principal quantum number n = 4, it is possible to have:
a) only s and p orbitals.
b) only s, p and d orbitals.
c) only an s orbital.
d) only s, p, d and f orbitals.
25. "No two electrons in an atom can have the same set of n, l, ml and ms quantum
numbers." This is a statement of:
a) Hund's rule.
b) the aufbau principle.
c) the Pauli exclusion principle.
d) Bohr's theory.
26. Which of the following pairings is incorrect?
a) 3s orbital; two radial nodes.
b) 3d orbital; no radial nodes.
c) 2p orbital; no radial nodes.
d) 1s orbital; one radial node.
Eigen Function and Eigen Values
27. A mathematical instruction or a procedure to be carried out on a function to get
another function is called:
a) Function
b) Operator
c) Another function
d) Value
28. The function on which the operation is carried out is called:
a) Another function
b) Value
c) Operand
d) None
29. In d/dx (x3) = 3 x2 the operator is:
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a) x2
b) 3x3
c) x
d) d/dx
30. Operator used for 3 dimensional movement of a particle is called:
a) Laplacian
b) Linear
c) Hamiltonian
d) Non-linear
31. Operator used for energy of 3 dimensional movement of a particle is called:
a) Laplacian
b) Linear
c) Hamiltonian
d) Non-linear
32. When an operator operates on a function and the same function is produced with
some numerical value then the function is called eigen function and its value is called
_______ .
a) Eigen value
b) Value
c) Operator
d) Function
33. In d2/dx (cos x) = -cos x , the eigen value is
a) 1
b) -1
c) 0
d) 2
Degeneracy
34. Motion of a particle in 3-D box different states having same total energy but
different quantum numbers are called_____ .
a) Wave function
b) Degenerated states
c) Operation
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d) Bands
35. The number of different quantum states belonging to same energy level is known as:
a) Degree of degeneracy
b) Wave function
c) Quantum number
d) Energy level
36. Lowest energy level level of a system is not zero but ______ ?
a) 16h2
/8ma2
b) 9h2
/8ma2
c) 4h2
/8ma2
d) h2
/8ma2
37. The degeneracy of a quantum particle in a cubic box having energy three times that
of thelowest energy is ________
a) 16h2
/8ma2
b) 9h2
/8ma2
c) 4h2
/8ma2
d) h2
/8ma2
38. The probability of finding the particle at a point is ______ for different quantum
numbers.
a) same
b) same or not
c) different
d) None
39. Square of wave function of an electron is called _______ of finding an electron in an
orbital.
a) Wave function
b) Probability
c) Wave particle duality
d) None
40. The point where wave function is zero is called:
a) Node
b) Antinode
c) Probability
d) Function
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Tunnelling Effect
41. The transmission based on tunnel effect is that of a plane wave through a ____
a) Circular Barrier
b) Opaque Object
c) Rectangular Barrier
d) Infinitely small barrier
42. The particle has a finite, non-zero, potential for the region ____
a) x > 0
b) x < 0
c) 0 < X < a
d) x > a
43. In quantum mechanics, if the energy of the particle, E, is less than the energy
required to enter a region, U, the particle is always reflected back.
a) True
b) False
44. Tunnel effect is notably observed in the case of ____
a) X-rays
b) Gamma rays
c) Alpha Particles
d) Beta Particles
45. Tunnel effect happens during nuclear fusion in stars.
a) True
b) False
46. Tunnel effect can be explained on the basis of ____
a) Schrodinger’s Equation
b) Particle in a Box
c) Heisenberg’s uncertainty principle
d) De-Broglie Wavelength
47. Which of the following lining material is useful for shield driven tunnels in sub
aqueous regions?
a) Stone masonry
b) Timber
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c) Cast iron
d) Cement concrete
48. A tunnel is found more advantageous as compared to the alternate routes because it:
a) Remains free from snow
b) Reduces the cost by reducing the route distance
c) Reduces the maintenance cost
d) All the above
49. The tunnel diode is mainly used
a) For very high speed of switching
b) To control the power
c) For rectification
d) For fact chopping
50. The Tunnel diode is best suited for
a) Amplitude limiters
b) Amplifiers
c) Oscillators
d) Rectifiers
51. The tunnelling phenomenon is also known as
a) Bulk semiconductor phenomenon
b) Auto electronic phenomenon
c) Auto electric phenomenon
d) Esaki phenomena
52. Tunnel diode operates very fast in the ………. region.
a) Gamma frequency region
b) Microwave frequency region
c) Radiofrequency region
d) Ultraviolet frequency region
53. The tunnelling involves
a) Acceleration of electron in p side
b) Movement of electrons from the n-side of the conduction band to the p-side of the valance
band
c) Charge distribution management in both the bands
d) Positive slope characteristic of the diode