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Objective Questions

Latest CGSSB Namuna Sahayak Exam Question (Objective Questions), MCQ in English

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Question Bank CGSSB Namuna Sahayak Exam - English
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Concerned Subject

Question 1Single Answer
According to de Broglie's hypothesis, what will be the de Broglie wavelength of a particle if its momentum is doubled?
  1. A
    Doubled
  2. B
    Unchanged
  3. C
    Halved
  4. D
    Quadrupled
Question 2Single Answer
Which of the following best explains why macroscopic objects do not exhibit observable wave properties?
  1. A
    Their velocity is always zero
  2. B
    Their de Broglie wavelength is extremely small
  3. C
    Their mass remains constant
  4. D
    Their density is very high
Question 3Single Answer
Which scientist experimentally verified the wave nature of electrons through electron diffraction?
  1. A
    Davisson and Germer
  2. B
    Ernest Rutherford
  3. C
    J.J. Thomson
  4. D
    James Chadwick
Question 4Single Answer
According to Heisenberg's Uncertainty Principle, simultaneous exact measurement of which pair of physical quantities is impossible?
  1. A
    Mass and charge
  2. B
    Velocity and mass
  3. C
    Energy and charge
  4. D
    Position and momentum
Question 5Single Answer
If the uncertainty in the position of an electron decreases, the uncertainty in its momentum will?
  1. A
    Decrease
  2. B
    Become zero
  3. C
    Increase
  4. D
    Remain constant
Question 6Single Answer
The Schrödinger wave equation primarily provides information about?
  1. A
    Exact trajectory of an electron
  2. B
    Mass of an electron
  3. C
    Probability distribution of an electron
  4. D
    Charge distribution in the nucleus
Question 7Single Answer
The quantity ψ² represents?
  1. A
    Momentum of an electron
  2. B
    Velocity of an electron
  3. C
    Energy of an orbital
  4. D
    Probability density of finding an electron
Question 8Single Answer
Which quantum number determines the principal energy level of an electron?
  1. A
    Magnetic quantum number
  2. B
    Spin quantum number
  3. C
    Azimuthal quantum number
  4. D
    Principal quantum number
Question 9Single Answer
The maximum number of electrons that can occupy the shell with n = 4 is?
  1. A
    18
  2. B
    32
  3. C
    24
  4. D
    36
Question 10Single Answer
The azimuthal quantum number for a 4d orbital is?
  1. A
    2
  2. B
    1
  3. C
    0
  4. D
    3
Question 11Single Answer
Which quantum number determines the shape of an orbital?
  1. A
    Principal quantum number
  2. B
    Spin quantum number
  3. C
    Azimuthal quantum number
  4. D
    Magnetic quantum number
Question 12Single Answer
How many orbitals are present in the 5f subshell?
  1. A
    7
  2. B
    5
  3. C
    3
  4. D
    9
Question 13Single Answer
The magnetic quantum number for a p-subshell can have how many possible values?
  1. A
    3
  2. B
    2
  3. C
    1
  4. D
    5
Question 14Single Answer
Which quantum number distinguishes two electrons occupying the same orbital?
  1. A
    Principal quantum number
  2. B
    Magnetic quantum number
  3. C
    Spin quantum number
  4. D
    Azimuthal quantum number
Question 15Single Answer
Which principle states that no two electrons in an atom can have the same set of four quantum numbers?
  1. A
    Hund's Rule
  2. B
    Pauli Exclusion Principle
  3. C
    Aufbau Principle
  4. D
    de Broglie Principle
Question 16Single Answer
According to Hund's Rule, electrons occupy degenerate orbitals by?
  1. A
    Remaining unpaired with parallel spins before pairing
  2. B
    Pairing first
  3. C
    Occupying the highest energy orbital first
  4. D
    Pairing with opposite spins immediately
Question 17Single Answer
The correct ground-state electronic configuration of chromium is?
  1. A
    [Ar] 3d⁴4s²
  2. B
    [Ar] 3d³4s³
  3. C
    [Ar] 3d⁶4s⁰
  4. D
    [Ar] 3d⁵4s¹
Question 18Single Answer
The exceptional electronic configuration of copper is?
  1. A
    [Ar] 3d⁸4s³
  2. B
    [Ar] 3d⁹4s²
  3. C
    [Ar] 3d⁷4s⁴
  4. D
    [Ar] 3d¹⁰4s¹
Question 19Single Answer
Which block of the periodic table contains elements with valence electrons entering the p-orbital?
  1. A
    s-block
  2. B
    d-block
  3. C
    p-block
  4. D
    f-block
Question 20Single Answer
The elements of the lanthanoid series involve the progressive filling of which subshell?
  1. A
    4f
  2. B
    4d
  3. C
    3d
  4. D
    5f
Question 21Single Answer
Which factor is primarily responsible for the lanthanoid contraction?
  1. A
    Poor shielding by 4f electrons
  2. B
    Increased shielding by f-electrons
  3. C
    Decrease in nuclear charge
  4. D
    Increase in principal quantum number
Question 22Single Answer
Due to lanthanoid contraction, zirconium and hafnium have?
  1. A
    Very different atomic radii
  2. B
    Nearly identical atomic radii
  3. C
    Opposite electronegativities
  4. D
    Equal ionization energies only
Question 23Single Answer
Which of the following has the highest first ionization enthalpy?
  1. A
    Sodium
  2. B
    Magnesium
  3. C
    Silicon
  4. D
    Aluminium
Question 24Single Answer
Why is the first ionization enthalpy of oxygen lower than that of nitrogen?
  1. A
    Oxygen has a larger atomic radius
  2. B
    Nitrogen has lower nuclear charge
  3. C
    Oxygen has fewer protons
  4. D
    Nitrogen has a stable half-filled 2p³ configuration
Question 25Single Answer
Which element has a higher first ionization enthalpy despite being to the right in the same period?
  1. A
    Nitrogen compared to Oxygen
  2. B
    Boron compared to Beryllium
  3. C
    Magnesium compared to Aluminium
  4. D
    Sulfur compared to Phosphorus
Question 26Single Answer
Why does chlorine have a more negative electron gain enthalpy than fluorine?
  1. A
    Addition of an electron to fluorine causes greater electron-electron repulsion in its compact 2p orbital
  2. B
    Fluorine has greater shielding
  3. C
    Chlorine has a lower effective nuclear charge
  4. D
    Chlorine has fewer electrons than fluorine
Question 27Single Answer
Which scale of electronegativity is based on bond dissociation energies?
  1. A
    Mulliken Scale
  2. B
    Pauling Scale
  3. C
    Allred-Rochow Scale
  4. D
    Sanderson Scale
Question 28Single Answer
Mulliken electronegativity is calculated using the average of which two atomic properties?
  1. A
    Atomic radius and density
  2. B
    Melting point and boiling point
  3. C
    Atomic mass and atomic number
  4. D
    Ionization enthalpy and electron affinity
Question 29Single Answer
Which of the following species has the smallest ionic radius?
  1. A
    O²⁻
  2. B
    Mg²⁺
  3. C
    Na⁺
  4. D
    F⁻
Question 30Single Answer
Which of the following sets is arranged in the correct order of increasing atomic radius?
  1. A
    Na < Mg < Al < Si
  2. B
    Mg < Na < Si < Al
  3. C
    Al < Mg < Si < Na
  4. D
    Si < Al < Mg < Na
Question 31Single Answer
Which of the following orbitals has the highest energy according to the (n + l) rule?
  1. A
    4s
  2. B
    3d
  3. C
    5s
  4. D
    4p
Question 32Single Answer
The maximum number of electrons that can have the principal quantum number (n = 5) is?
  1. A
    32
  2. B
    50
  3. C
    40
  4. D
    72
Question 33Single Answer
Which subshell contains orbitals having dumbbell-shaped electron density?
  1. A
    s
  2. B
    d
  3. C
    p
  4. D
    f
Question 34Single Answer
The value of azimuthal quantum number for the 5g subshell is?
  1. A
    2
  2. B
    3
  3. C
    4
  4. D
    5
Question 35Single Answer
The total number of orbitals present in the fourth shell is?
  1. A
    16
  2. B
    9
  3. C
    14
  4. D
    12
Question 36Single Answer
Which of the following quantum numbers can never have a negative value?
  1. A
    Magnetic quantum number
  2. B
    Principal quantum number
  3. C
    Spin quantum number
  4. D
    Azimuthal quantum number
Question 37Single Answer
Which orbital can never exist?
  1. A
    2p
  2. B
    3d
  3. C
    5g
  4. D
    3f
Question 38Single Answer
The maximum number of electrons in all orbitals having (l = 2) is?
  1. A
    6
  2. B
    8
  3. C
    10
  4. D
    14
Question 39Single Answer
Which of the following has the greatest penetration towards the nucleus?
  1. A
    3s
  2. B
    3d
  3. C
    3p
  4. D
    4s
Question 40Single Answer
The order of penetration for orbitals of the same principal quantum number is?
  1. A
    s > p > d > f
  2. B
    f > d > p > s
  3. C
    p > s > d > f
  4. D
    d > p > s > f
Question 41Single Answer
Which principle explains the lower energy of 4s than 3d in neutral atoms?
  1. A
    Heisenberg Principle
  2. B
    Bohr Postulate
  3. C
    Aufbau Principle
  4. D
    Wave-Particle Duality
Question 42Single Answer
The electronic configuration of Fe³⁺ is?
  1. A
    [Ar] 3d⁵
  2. B
    [Ar] 3d⁶
  3. C
    [Ar] 3d⁵4s¹
  4. D
    [Ar] 3d⁴
Question 43Single Answer
Which element has the configuration [Kr] 4d¹⁰5s²5p²?
  1. A
    Antimony
  2. B
    Indium
  3. C
    Tin
  4. D
    Tellurium
Question 44Single Answer
Which element possesses a completely filled p-subshell in its valence shell?
  1. A
    Nitrogen
  2. B
    Oxygen
  3. C
    Fluorine
  4. D
    Neon
Question 45Single Answer
Which block of the periodic table contains transition elements?
  1. A
    s-block
  2. B
    p-block
  3. C
    f-block
  4. D
    d-block
Question 46Single Answer
Which block contains inner transition elements?
  1. A
    f-block
  2. B
    d-block
  3. C
    s-block
  4. D
    p-block
Question 47Single Answer
Which of the following elements belongs to Group 16?
  1. A
    Chlorine
  2. B
    Sulfur
  3. C
    Phosphorus
  4. D
    Bromine
Question 48Single Answer
Which period contains the first transition series?
  1. A
    Third
  2. B
    Fifth
  3. C
    Fourth
  4. D
    Sixth
Question 49Single Answer
Which pair shows diagonal relationship?
  1. A
    Beryllium and Calcium
  2. B
    Sodium and Potassium
  3. C
    Lithium and Magnesium
  4. D
    Boron and Aluminium
Question 50Single Answer
Which element exhibits the highest electronegativity according to the Pauling scale?
  1. A
    Oxygen
  2. B
    Chlorine
  3. C
    Nitrogen
  4. D
    Fluorine
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