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Objective Questions

Latest CUET PG Nanoscience Exam Question (Objective Questions), MCQ in English

Subjects : Nanoscience

Question Bank CUET PG Nanoscience (MTQP08) Exam - English
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Nanoscience

Question 1Single Answer
Effective nuclear charge Zeff is defined as?
  1. A
    Actual nuclear charge
  2. B
    Net positive charge experienced by an electron
  3. C
    Charge of nucleus minus protons
  4. D
    Charge due to valence electrons
Question 2Single Answer
Effective nuclear charge is always ________ actual nuclear charge.
  1. A
    Equal to
  2. B
    Greater than
  3. C
    Less than
  4. D
    Zero
Question 3Single Answer
The decrease in nuclear attraction due to inner electrons is called?
  1. A
    Penetration
  2. B
    Orbital overlap
  3. C
    Screening constant
  4. D
    Shielding effect
Question 4Single Answer
Slater's rules are used to calculate?
  1. A
    Ionization energy
  2. B
    Atomic radius
  3. C
    Electron affinity
  4. D
    Effective nuclear charge
Question 5Single Answer
According to Slater's rules, electrons in the same group contribute a shielding constant of?
  1. A
    0.35
  2. B
    0.30
  3. C
    0.50
  4. D
    1.00
Question 6Single Answer
For ns or np electrons, electrons in (n-1) shell contribute?
  1. A
    0.35
  2. B
    1.00
  3. C
    0.85
  4. D
    0.30
Question 7Single Answer
For nd or nf electrons, electrons in the same group contribute?
  1. A
    0.35
  2. B
    0.85
  3. C
    1.00
  4. D
    0.50
Question 8Single Answer
Which orbital shows maximum shielding effect?
  1. A
    f
  2. B
    p
  3. C
    d
  4. D
    s
Question 9Single Answer
Penetration ability of orbitals decreases in the order?
  1. A
    s > p > d > f
  2. B
    p > s > d > f
  3. C
    d > p > s > f
  4. D
    f > d > p > s
Question 10Single Answer
Higher penetration leads to?
  1. A
    Lower Zeff
  2. B
    Orbital contraction
  3. C
    No change in Zeff
  4. D
    Higher Zeff
Question 11Single Answer
Effective nuclear charge generally increases across a period because?
  1. A
    Atomic size increases
  2. B
    Nuclear charge increases
  3. C
    Shielding remains nearly constant
  4. D
    Both B and C
Question 12Single Answer
In Slater's rules, electrons in shells lower than (n-1) contribute?
  1. A
    0.35
  2. B
    0.85
  3. C
    1.00
  4. D
    0.50
Question 13Single Answer
Which electron experiences the highest effective nuclear charge?
  1. A
    3s in Na
  2. B
    3p in Cl
  3. C
    2p in F
  4. D
    4s in K
Question 14Single Answer
Shielding effect is least effective in which subshell?
  1. A
    s
  2. B
    f
  3. C
    d
  4. D
    p
Question 15Single Answer
Poor shielding by d and f electrons results in?
  1. A
    Increase in atomic size
  2. B
    Decrease in atomic size
  3. C
    Constant size
  4. D
    Zero effect
Question 16Single Answer
Lanthanide contraction occurs due to?
  1. A
    Large atomic mass
  2. B
    High electronegativity
  3. C
    Poor shielding by f-electrons
  4. D
    Nuclear instability
Question 17Single Answer
Effective nuclear charge explains periodic trends of?
  1. A
    Atomic radius
  2. B
    Ionization energy
  3. C
    Electronegativity
  4. D
    All of the above
Question 18Single Answer
Which element has the highest Zeff for valence electrons?
  1. A
    Cl
  2. B
    Mg
  3. C
    Al
  4. D
    Na
Question 19Single Answer
Effective nuclear charge depends on?
  1. A
    All of the above
  2. B
    Shielding constant
  3. C
    Electronic configuration
  4. D
    Nuclear charge
Question 20Single Answer
Slater's rules give?
  1. A
    Approximate Zeff
  2. B
    Exact Zeff
  3. C
    Experimental value
  4. D
    Zero error value
Question 21Single Answer
Increase in shielding effect causes?
  1. A
    Increase in ionization energy
  2. B
    Increase in electronegativity
  3. C
    Decrease in ionization energy
  4. D
    No effect
Question 22Single Answer
Which factor does not affect Zeff?
  1. A
    Temperature
  2. B
    Shielding
  3. C
    Orbital penetration
  4. D
    Nuclear charge
Question 23Single Answer
Effective nuclear charge for outer electrons is lowest in?
  1. A
    Noble gases
  2. B
    Halogens
  3. C
    Alkali metals
  4. D
    Transition metals
Question 24Single Answer
Poor shielding causes higher?
  1. A
    Atomic radius
  2. B
    Ionization enthalpy
  3. C
    Electron gain enthalpy
  4. D
    Metallic character
Question 25Single Answer
Slater's rules are not applicable accurately for?
  1. A
    Heavy atoms
  2. B
    Multi-electron atoms
  3. C
    Hydrogen atom
  4. D
    Transition metals
Question 26Single Answer
Atomic radius is defined as?
  1. A
    Distance from nucleus to valence shell
  2. B
    Distance between ions
  3. C
    Distance between valence electrons
  4. D
    Half the distance between nuclei of two bonded atoms
Question 27Single Answer
Atomic radius decreases across a period due to?
  1. A
    Increase in shielding
  2. B
    Decrease in electrons
  3. C
    Increase in principal quantum number
  4. D
    Increase in nuclear charge
Question 28Single Answer
Atomic radius increases down a group because of?
  1. A
    Increase in Zeff
  2. B
    Addition of new shells
  3. C
    Decrease in shielding
  4. D
    Poor penetration
Question 29Single Answer
Which has the smallest atomic radius?
  1. A
    Na
  2. B
    Cl
  3. C
    Al
  4. D
    Mg
Question 30Single Answer
Covalent radius is measured in?
  1. A
    Covalent bonds
  2. B
    Metallic bonds
  3. C
    Ionic compounds
  4. D
    Hydrogen bonds
Question 31Single Answer
Van der Waals radius is ______ covalent radius.
  1. A
    Larger than
  2. B
    Equal to
  3. C
    Smaller than
  4. D
    Zero
Question 32Single Answer
Ionic radius of anion is ______ its parent atom.
  1. A
    Larger than
  2. B
    Equal to
  3. C
    Smaller than
  4. D
    Zero
Question 33Single Answer
Which ion is largest?
  1. A
    Na
  2. B
    O
  3. C
    Al
  4. D
    Mg
Question 34Single Answer
Isoelectronic species have?
  1. A
    Same atomic number
  2. B
    Same mass
  3. C
    Same radius
  4. D
    Same number of electrons
Question 35Single Answer
In an isoelectronic series, radius decreases with?
  1. A
    Increasing nuclear charge
  2. B
    Decreasing nuclear charge
  3. C
    Increasing electrons
  4. D
    Shielding
Question 36Single Answer
Which is smallest in the series O, F, Na, Mg?
  1. A
    O
  2. B
    F
  3. C
    Mg
  4. D
    Na
Question 37Single Answer
Metallic radius is measured in?
  1. A
    Covalent solids
  2. B
    Gases
  3. C
    Ionic solids
  4. D
    Metals
Question 38Single Answer
Metallic radius is generally?
  1. A
    Smaller than covalent radius
  2. B
    Larger than covalent radius
  3. C
    Equal to ionic radius
  4. D
    Constant
Question 39Single Answer
Atomic radius of noble gases is measured as?
  1. A
    Covalent radius
  2. B
    Ionic radius
  3. C
    Metallic radius
  4. D
    Van der Waals radius
Question 40Single Answer
Which factor does not affect atomic radius?
  1. A
    Nuclear charge
  2. B
    Temperature
  3. C
    Quantum number
  4. D
    Shielding
Question 41Single Answer
Lanthanide contraction causes?
  1. A
    Decrease in atomic size
  2. B
    Increase in atomic size
  3. C
    Constant size
  4. D
    Random variation
Question 42Single Answer
Alkali metals have largest atomic radii because?
  1. A
    Single valence electron
  2. B
    Low shielding
  3. C
    High nuclear charge
  4. D
    Poor penetration
Question 43Single Answer
Atomic radius correlates inversely with?
  1. A
    Basicity
  2. B
    Metallic character
  3. C
    Reactivity of metals
  4. D
    Ionization energy
Question 44Single Answer
Smaller atomic radius leads to?
  1. A
    Lower ionization energy
  2. B
    Higher metallic character
  3. C
    Lower electronegativity
  4. D
    Higher ionization energy
Question 45Single Answer
Transition metals show small change in atomic radii due to?
  1. A
    Nuclear instability
  2. B
    Large atomic mass
  3. C
    Same principal shell
  4. D
    Poor shielding by d-electrons
Question 46Single Answer
Atomic radius of elements in a group increases from?
  1. A
    Top to bottom
  2. B
    Bottom to top
  3. C
    Middle outward
  4. D
    Randomly
Question 47Single Answer
Ionic radius depends on?
  1. A
    Charge on ion
  2. B
    All of the above
  3. C
    Nuclear charge
  4. D
    Number of electrons
Question 48Single Answer
Which has greater ionic radius? Na or K?
  1. A
    Na
  2. B
    Cannot be determined
  3. C
    Same
  4. D
    K
Question 49Single Answer
Atomic size is minimum at?
  1. A
    Left bottom of periodic table
  2. B
    Right top
  3. C
    Left top
  4. D
    Right bottom
Question 50Single Answer
Ionization enthalpy is energy required to?
  1. A
    Add an electron
  2. B
    Break a bond
  3. C
    Excite an electron
  4. D
    Remove an electron
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