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Latest KEA KREIS Teacher Science Exam Question (Objective Questions), MCQ in English

Subjects : Subject Specific Paper (Science)

Question Bank KEA KREIS Teacher (Science) Paper 2 Exam - English
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Subject Specific Paper (Science)

Question 1Single Answer
Which subatomic particle determines the atomic number of an element?
  1. A
    Proton
  2. B
    Neutron
  3. C
    Electron
  4. D
    Positron
Question 2Single Answer
The maximum number of electrons that can be accommodated in the third shell is?
  1. A
    8
  2. B
    32
  3. C
    18
  4. D
    16
Question 3Single Answer
Which quantum number determines the shape of an atomic orbital?
  1. A
    Principal quantum number
  2. B
    Azimuthal quantum number
  3. C
    Magnetic quantum number
  4. D
    Spin quantum number
Question 4Single Answer
The value of azimuthal quantum number for a d-orbital is?
  1. A
    2
  2. B
    1
  3. C
    0
  4. D
    3
Question 5Single Answer
How many orbitals are present in a p-subshell?
  1. A
    1
  2. B
    7
  3. C
    5
  4. D
    3
Question 6Single Answer
Which principle states that no two electrons in an atom can have the same set of four quantum numbers?
  1. A
    Aufbau principle
  2. B
    Hund's rule
  3. C
    Pauli exclusion principle
  4. D
    Heisenberg principle
Question 7Single Answer
According to Hund's rule, electrons occupy degenerate orbitals initially with?
  1. A
    Opposite spins
  2. B
    Paired spins
  3. C
    Zero spin
  4. D
    Parallel spins
Question 8Single Answer
Which orbital has a spherical shape?
  1. A
    p-orbital
  2. B
    s-orbital
  3. C
    d-orbital
  4. D
    f-orbital
Question 9Single Answer
What is the maximum number of electrons in an f-subshell?
  1. A
    6
  2. B
    10
  3. C
    18
  4. D
    14
Question 10Single Answer
Which electromagnetic radiation was used in Rutherford's scattering experiment?
  1. A
    Beta particles
  2. B
    Gamma rays
  3. C
    Alpha particles
  4. D
    X-rays
Question 11Single Answer
Rutherford's atomic model could not explain the?
  1. A
    Presence of nucleus
  2. B
    Stability of atom
  3. C
    Positive charge on nucleus
  4. D
    Existence of protons
Question 12Single Answer
Bohr's atomic model was most successful in explaining the spectrum of?
  1. A
    Helium atom
  2. B
    Hydrogen atom
  3. C
    Carbon atom
  4. D
    Oxygen atom
Question 13Single Answer
The de Broglie equation establishes the relationship between momentum and?
  1. A
    Frequency
  2. B
    Charge
  3. C
    Wavelength
  4. D
    Energy level only
Question 14Single Answer
The uncertainty principle was proposed by?
  1. A
    Planck
  2. B
    Heisenberg
  3. C
    Einstein
  4. D
    Moseley
Question 15Single Answer
Which element has the electronic configuration 1s² 2s² 2p⁶ 3s¹?
  1. A
    Magnesium
  2. B
    Aluminium
  3. C
    Sodium
  4. D
    Neon
Question 16Single Answer
Elements in the same group of the periodic table generally possess the same number of?
  1. A
    Neutrons
  2. B
    Shells
  3. C
    Isotopes
  4. D
    Valence electrons
Question 17Single Answer
Atomic radius generally decreases across a period because of increasing?
  1. A
    Number of shells
  2. B
    Shielding only
  3. C
    Nuclear charge
  4. D
    Atomic mass only
Question 18Single Answer
Which element has the highest electronegativity?
  1. A
    Oxygen
  2. B
    Chlorine
  3. C
    Nitrogen
  4. D
    Fluorine
Question 19Single Answer
Which alkali metal has the smallest atomic radius?
  1. A
    Rubidium
  2. B
    Sodium
  3. C
    Potassium
  4. D
    Lithium
Question 20Single Answer
Ionization energy generally decreases down a group due to an increase in?
  1. A
    Effective nuclear attraction
  2. B
    Electronegativity
  3. C
    Atomic size
  4. D
    Electron affinity
Question 21Single Answer
Which group contains the noble gases?
  1. A
    Group 1
  2. B
    Group 2
  3. C
    Group 18
  4. D
    Group 17
Question 22Single Answer
The most electronegative element among nitrogen, oxygen, sulfur and chlorine is?
  1. A
    Nitrogen
  2. B
    Oxygen
  3. C
    Sulfur
  4. D
    Chlorine
Question 23Single Answer
Which periodic property generally increases from left to right across a period?
  1. A
    Atomic size
  2. B
    Metallic character
  3. C
    Electropositive character
  4. D
    Electronegativity
Question 24Single Answer
Which element belongs to the halogen family?
  1. A
    Sulfur
  2. B
    Argon
  3. C
    Bromine
  4. D
    Calcium
Question 25Single Answer
The modern periodic law is based on?
  1. A
    Atomic mass
  2. B
    Atomic number
  3. C
    Atomic volume
  4. D
    Number of neutrons
Question 26Single Answer
An ionic bond is formed primarily by?
  1. A
    Transfer of electrons
  2. B
    Sharing of electrons
  3. C
    Sharing of protons
  4. D
    Transfer of neutrons
Question 27Single Answer
Which compound contains predominantly ionic bonding?
  1. A
    CH₄
  2. B
    H₂O
  3. C
    NaCl
  4. D
    NH₃
Question 28Single Answer
A covalent bond is formed through the?
  1. A
    Transfer of electrons
  2. B
    Loss of neutrons
  3. C
    Transfer of protons
  4. D
    Sharing of electron pairs
Question 29Single Answer
Which molecule has a linear geometry?
  1. A
    H₂O
  2. B
    CO₂
  3. C
    NH₃
  4. D
    CH₄
Question 30Single Answer
The shape of methane is?
  1. A
    Square planar
  2. B
    Trigonal planar
  3. C
    Tetrahedral
  4. D
    Bent
Question 31Single Answer
The geometry of BF₃ is?
  1. A
    Pyramidal
  2. B
    Trigonal planar
  3. C
    Tetrahedral
  4. D
    Linear
Question 32Single Answer
Which molecule contains a coordinate covalent bond?
  1. A
    H₂
  2. B
    NH₄⁺
  3. C
    Cl₂
  4. D
    O₂
Question 33Single Answer
Hydrogen bonding is strongest when hydrogen is bonded to?
  1. A
    Carbon
  2. B
    Silicon
  3. C
    Nitrogen, oxygen or fluorine
  4. D
    Sulfur only
Question 34Single Answer
The unusually high boiling point of water is mainly due to?
  1. A
    Ionic bonding
  2. B
    Hydrogen bonding
  3. C
    Metallic bonding
  4. D
    Coordinate bonding
Question 35Single Answer
Which hybridization occurs in carbon atoms of ethene?
  1. A
    sp
  2. B
    sp²
  3. C
    sp³
  4. D
    dsp²
Question 36Single Answer
The hybridization of carbon atoms in ethyne is?
  1. A
    sp²
  2. B
    sp
  3. C
    sp³
  4. D
    d²sp³
Question 37Single Answer
Which molecule is nonpolar despite containing polar bonds?
  1. A
    H₂O
  2. B
    NH₃
  3. C
    SO₂
  4. D
    CO₂
Question 38Single Answer
A sigma bond is formed by?
  1. A
    Sidewise overlap only
  2. B
    Head-on overlap of orbitals
  3. C
    Transfer of electrons
  4. D
    Complete ionization
Question 39Single Answer
A double covalent bond consists of?
  1. A
    One sigma and one pi bond
  2. B
    Two sigma bonds
  3. C
    Two pi bonds
  4. D
    One ionic and one sigma bond
Question 40Single Answer
The removal of gangue from an ore is known as?
  1. A
    Roasting
  2. B
    Calcination
  3. C
    Concentration of ore
  4. D
    Smelting
Question 41Single Answer
Froth flotation is commonly used for concentrating?
  1. A
    Sulphide ores
  2. B
    Oxide ores
  3. C
    Carbonate ores
  4. D
    Halide ores
Question 42Single Answer
Roasting is mainly carried out by heating an ore in?
  1. A
    Absence of air
  2. B
    Excess air
  3. C
    Water
  4. D
    Hydrogen
Question 43Single Answer
Calcination is commonly used for?
  1. A
    Sulphide ores
  2. B
    Carbonate ores
  3. C
    Chloride ores
  4. D
    Nitrate salts only
Question 44Single Answer
Aluminium is commercially extracted from?
  1. A
    Haematite
  2. B
    Galena
  3. C
    Bauxite
  4. D
    Cinnabar
Question 45Single Answer
Haematite is an important ore of?
  1. A
    Copper
  2. B
    Zinc
  3. C
    Iron
  4. D
    Aluminium
Question 46Single Answer
Galena is an ore of?
  1. A
    Mercury
  2. B
    Tin
  3. C
    Lead
  4. D
    Nickel
Question 47Single Answer
Cinnabar is the principal ore of?
  1. A
    Zinc
  2. B
    Chromium
  3. C
    Iron
  4. D
    Mercury
Question 48Single Answer
Transition elements are characterized by the presence of partially filled?
  1. A
    s-orbitals
  2. B
    d-orbitals
  3. C
    p-orbitals
  4. D
    f-orbitals only
Question 49Single Answer
Which transition metal commonly shows the highest oxidation state of +7?
  1. A
    Manganese
  2. B
    Iron
  3. C
    Nickel
  4. D
    Zinc
Question 50Single Answer
Which ion is responsible for the blue colour of aqueous copper sulphate solution?
  1. A
    Cu²⁺
  2. B
    Cu⁺
  3. C
    Zn²⁺
  4. D
    Fe³⁺
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