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Objective Questions

Latest OSSC Laboratory Assistant Exam Question (Objective Questions), MCQ in English

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Question Bank OSSC Laboratory Assistant Exam (Chemistry) - English
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Concerned Subject

Question 1Single Answer
The pressure exerted by a gas is due to:
  1. A
    Attraction between gas molecules
  2. B
    Collision of gas molecules with container walls
  3. C
    Weight of gas molecules only
  4. D
    Repulsion between container walls
Question 2Single Answer
Boyle’s law states that at constant temperature, pressure of a fixed mass of gas is inversely proportional to:
  1. A
    Temperature
  2. B
    Volume
  3. C
    Density
  4. D
    Number of molecules
Question 3Single Answer
The mathematical expression of Boyle’s law is:
  1. A
    V/T = constant
  2. B
    P/V = constant
  3. C
    PV = constant
  4. D
    P/T = constant
Question 4Single Answer
Charles’ law states that at constant pressure, volume of a gas is directly proportional to its:
  1. A
    Absolute temperature
  2. B
    Celsius temperature
  3. C
    Pressure
  4. D
    Molecular mass
Question 5Single Answer
Charles’ law can be expressed as:
  1. A
    V/T = constant
  2. B
    VT = constant
  3. C
    PV = constant
  4. D
    P/T = constant
Question 6Single Answer
Gay-Lussac’s pressure law states that at constant volume, pressure is directly proportional to:
  1. A
    Volume
  2. B
    Absolute temperature
  3. C
    Density
  4. D
    Molecular mass
Question 7Single Answer
Avogadro’s law states that equal volumes of gases at the same temperature and pressure contain equal numbers of:
  1. A
    Molecules
  2. B
    Atoms only
  3. C
    Electrons only
  4. D
    Neutrons
Question 8Single Answer
The ideal gas equation is:
  1. A
    P = nV/RT
  2. B
    PT = nRV
  3. C
    V = nPRT
  4. D
    PV = nRT
Question 9Single Answer
The SI unit of the gas constant R is:
  1. A
    N mol⁻¹
  2. B
    J mol⁻¹
  3. C
    J mol⁻¹ K⁻¹
  4. D
    K mol⁻¹
Question 10Single Answer
The value of R in SI units is approximately:
  1. A
    0.0821 J mol⁻¹ K⁻¹
  2. B
    8.314 J mol⁻¹ K⁻¹
  3. C
    6.022 J mol⁻¹ K⁻¹
  4. D
    1.987 J mol⁻¹ K⁻¹
Question 11Single Answer
At STP, one mole of an ideal gas occupies approximately:
  1. A
    2.24 L
  2. B
    11.2 L
  3. C
    224 L
  4. D
    22.4 L
Question 12Single Answer
The number of molecules in one mole of a gas is:
  1. A
    1.6 × 10⁻¹⁹
  2. B
    3.011 × 10²³
  3. C
    9.8 × 10²³
  4. D
    6.022 × 10²³
Question 13Single Answer
Dalton’s law deals with:
  1. A
    Partial pressures
  2. B
    Gas diffusion
  3. C
    Gas viscosity
  4. D
    Critical temperature
Question 14Single Answer
According to Dalton’s law, total pressure of a gas mixture equals:
  1. A
    Product of partial pressures
  2. B
    Average of partial pressures
  3. C
    Sum of partial pressures
  4. D
    Difference of partial pressures
Question 15Single Answer
Graham’s law is related to rate of:
  1. A
    Ionization
  2. B
    Condensation
  3. C
    Diffusion and effusion
  4. D
    Dissociation
Question 16Single Answer
According to Graham’s law, rate of diffusion is inversely proportional to square root of:
  1. A
    Pressure
  2. B
    Temperature
  3. C
    Molar mass
  4. D
    Volume
Question 17Single Answer
Which gas diffuses fastest?
  1. A
    N₂
  2. B
    O₂
  3. C
    H₂
  4. D
    CO₂
Question 18Single Answer
Real gases show maximum deviation from ideal behavior at:
  1. A
    Low pressure and high temperature
  2. B
    Low pressure and low temperature only
  3. C
    High pressure and low temperature
  4. D
    High temperature only
Question 19Single Answer
A real gas approaches ideal behavior at:
  1. A
    High pressure and low temperature
  2. B
    High pressure and high density
  3. C
    Low pressure and high temperature
  4. D
    Critical temperature only
Question 20Single Answer
The van der Waals equation corrects for:
  1. A
    Ionization energy
  2. B
    Atomic number
  3. C
    Nuclear charge
  4. D
    Molecular volume and intermolecular forces
Question 21Single Answer
In van der Waals equation, constant a accounts for:
  1. A
    Molecular volume
  2. B
    Temperature
  3. C
    Intermolecular attraction
  4. D
    Molecular speed
Question 22Single Answer
In van der Waals equation, constant b accounts for:
  1. A
    Intermolecular attraction
  2. B
    Gas pressure only
  3. C
    Effective molecular volume
  4. D
    Temperature
Question 23Single Answer
Compressibility factor Z is defined as:
  1. A
    PV/nRT
  2. B
    nRT/PV
  3. C
    PT/nRV
  4. D
    P/V
Question 24Single Answer
For an ideal gas, compressibility factor Z is:
  1. A
    0
  2. B
    Infinite
  3. C
    2
  4. D
    1
Question 25Single Answer
Critical temperature is the temperature above which a gas:
  1. A
    Always becomes solid
  2. B
    Cannot be liquefied by pressure alone
  3. C
    Has zero pressure
  4. D
    Becomes ideal exactly
Question 26Single Answer
The electron was discovered by:
  1. A
    J. J. Thomson
  2. B
    Rutherford
  3. C
    Chadwick
  4. D
    Bohr
Question 27Single Answer
The neutron was discovered by:
  1. A
    Moseley
  2. B
    Rutherford
  3. C
    James Chadwick
  4. D
    Millikan
Question 28Single Answer
The nucleus was discovered through the alpha-particle scattering experiment by:
  1. A
    Bohr
  2. B
    Planck
  3. C
    Rutherford
  4. D
    Einstein
Question 29Single Answer
The charge on an electron is:
  1. A
    +1.602 × 10⁻¹⁹ C
  2. B
    −1.602 × 10⁻¹⁹ C
  3. C
    Zero
  4. D
    −9.109 × 10⁻³¹ C
Question 30Single Answer
The mass of an electron is approximately:
  1. A
    6.02 × 10²³ kg
  2. B
    1.67 × 10⁻²⁷ kg
  3. C
    1.66 × 10⁻²⁴ kg
  4. D
    9.11 × 10⁻³¹ kg
Question 31Single Answer
Atomic number represents the number of:
  1. A
    Protons
  2. B
    Neutrons
  3. C
    Protons + neutrons
  4. D
    Electrons + neutrons
Question 32Single Answer
Mass number is equal to the number of:
  1. A
    Protons only
  2. B
    Protons + neutrons
  3. C
    Neutrons only
  4. D
    Electrons + protons
Question 33Single Answer
Isotopes have the same:
  1. A
    Mass number
  2. B
    Atomic number
  3. C
    Number of neutrons
  4. D
    Atomic mass
Question 34Single Answer
Isobars have the same:
  1. A
    Atomic number
  2. B
    Mass number
  3. C
    Number of protons
  4. D
    Number of electrons necessarily
Question 35Single Answer
Isotones have the same number of:
  1. A
    Protons
  2. B
    Nucleons
  3. C
    Electrons
  4. D
    Neutrons
Question 36Single Answer
Bohr’s atomic model successfully explained the spectrum of:
  1. A
    Solids
  2. B
    All multi-electron atoms completely
  3. C
    Molecules
  4. D
    Hydrogen atom
Question 37Single Answer
According to Bohr, angular momentum of electron is quantized as:
  1. A
    h/n
  2. B
    nh/2π
  3. C
    2πnh
  4. D
    nh
Question 38Single Answer
The principal quantum number is represented by:
  1. A
    m
  2. B
    l
  3. C
    n
  4. D
    s
Question 39Single Answer
The azimuthal quantum number determines the:
  1. A
    Size of orbital only
  2. B
    Shape of orbital
  3. C
    Spin of electron
  4. D
    Nuclear charge
Question 40Single Answer
The magnetic quantum number determines the:
  1. A
    Orientation of orbital
  2. B
    Size of atom
  3. C
    Energy only
  4. D
    Spin direction
Question 41Single Answer
Spin quantum number of an electron may be:
  1. A
    +1 or −1
  2. B
    +2 or −2
  3. C
    0 or 1
  4. D
    +½ or −½
Question 42Single Answer
For an s orbital, l equals:
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 43Single Answer
For a p orbital, l equals:
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 44Single Answer
For a d orbital, l equals:
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 45Single Answer
Number of orbitals in a p subshell is:
  1. A
    1
  2. B
    7
  3. C
    5
  4. D
    3
Question 46Single Answer
Maximum number of electrons in a p subshell is:
  1. A
    2
  2. B
    10
  3. C
    6
  4. D
    14
Question 47Single Answer
Maximum number of electrons in a d subshell is:
  1. A
    6
  2. B
    10
  3. C
    8
  4. D
    14
Question 48Single Answer
Pauli exclusion principle states that no two electrons in an atom can have the same set of:
  1. A
    Four quantum numbers
  2. B
    Three quantum numbers
  3. C
    Two quantum numbers
  4. D
    Atomic numbers
Question 49Single Answer
Hund’s rule is concerned with filling of:
  1. A
    Molecular mass levels
  2. B
    Nuclear shells
  3. C
    Proton levels
  4. D
    Degenerate orbitals
Question 50Single Answer
Aufbau principle states that electrons occupy:
  1. A
    Lowest energy orbitals first
  2. B
    Highest energy orbitals first
  3. C
    p orbitals first
  4. D
    d orbitals first
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