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Latest WBSSC SLST Higher Secondary Assistant Teacher Chemistry Exam Question (Objective Questions), MCQ in English

Subjects : Chemistry

Question Bank WBSSC SLST Higher Secondary Assistant Teacher (Chemistry) Exam - English
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Chemistry

Question 1Single Answer
What does the mean free path of gas molecules represent?
  1. A
    Average distance traveled between collisions
  2. B
    Time between collisions
  3. C
    Maximum velocity
  4. D
    Collision frequency
Question 2Single Answer
The mean free path increases when pressure is ?
  1. A
    Increased
  2. B
    Decreased
  3. C
    Unchanged
  4. D
    Absolute zero
Question 3Single Answer
Binary collision frequency in a single gas increases with ?
  1. A
    Increase in temperature
  2. B
    Decrease in temperature
  3. C
    Constant
  4. D
    Decrease in volume
Question 4Single Answer
Which factor does not influence collision frequency?
  1. A
    Molecular size
  2. B
    Gas density
  3. C
    Pressure
  4. D
    Color of gas
Question 5Single Answer
The van der Waals equation accounts for ?
  1. A
    Perfect gas behavior
  2. B
    Intermolecular forces and molecular volume
  3. C
    Kinetic energy only
  4. D
    Ionization energy
Question 6Single Answer
For a real gas, the “b” constant represents ?
  1. A
    Molar volume excluded
  2. B
    Intermolecular attraction
  3. C
    Correction for pressure
  4. D
    Critical volume
Question 7Single Answer
Critical temperature (Tc) is defined as the temperature above which ?
  1. A
    Gas condenses
  2. B
    Liquid cannot exist
  3. C
    Vapor pressure is zero
  4. D
    Ideal gas law holds
Question 8Single Answer
According to the rule of Cailletet and Mathias, the critical volumes of many gases are about of their boiling volume?
  1. A
    2
  2. B
    45
  3. C
    8
  4. D
    0
Question 9Single Answer
The reduced equation of state uses reduced parameters defined as ?
  1. A
    P/Pc, V/Vc, T/Tc
  2. B
    P–Pc, V–Vc, T–Tc
  3. C
    Pc–P, Vc–V, Tc–T
  4. D
    P², V², T²
Question 10Single Answer
The principle of corresponding states suggests that two gases at same reduced conditions have behaviors?
  1. A
    Different
  2. B
    Similar
  3. C
    Only temperature dependent
  4. D
    Only pressure dependent
Question 11Single Answer
Maxwell’s distribution law relates to the distribution of speeds?
  1. A
    Sound
  2. B
    Photon energies
  3. C
    Molecular velocities
  4. D
    Ionization potentials
Question 12Single Answer
The most probable molecular speed is the average molecular speed?
  1. A
    Equal to
  2. B
    Less than
  3. C
    Greater than
  4. D
    Twice
Question 13Single Answer
Root-mean-square speed (urms) of gas molecules depends on ?
  1. A
    Temperature and molar mass
  2. B
    Pressure and volume
  3. C
    Volume and density
  4. D
    Temperature and pressure
Question 14Single Answer
Maxwell’s distribution curve broadens as temperature ?
  1. A
    Increases
  2. B
    Decreases
  3. C
    Remains constant
  4. D
    Goes to zero
Question 15Single Answer
Kinetic energy distribution is derived mathematically from ?
  1. A
    Ideal gas law
  2. B
    Maxwell’s velocity distribution
  3. C
    van der Waals equation
  4. D
    Boyle's law
Question 16Single Answer
The Boltzmann equation gives the relative population of molecules at different ____ states?
  1. A
    Pressure
  2. B
    Momentum
  3. C
    Energy
  4. D
    Volume
Question 17Single Answer
The barometric formula expresses how atmospheric pressure with altitude?
  1. A
    Increases
  2. B
    Decreases
  3. C
    Oscillates
  4. D
    Remains constant
Question 18Single Answer
Mean free path is inversely proportional to ?
  1. A
    Pressure
  2. B
    Temperature
  3. C
    Molecular mass
  4. D
    Volume
Question 19Single Answer
The collision cross-section of molecules influences ?
  1. A
    Enthalpy
  2. B
    Collision frequency
  3. C
    Magnetic susceptibility
  4. D
    Refractive index
Question 20Single Answer
The discrepancy between real and ideal gas behavior increases at ?
  1. A
    Low molecular mass
  2. B
    Low pressure
  3. C
    High pressure
  4. D
    High molar volume
Question 21Single Answer
At critical point, the isotherm on p–V plot has point of inflection?
  1. A
    One
  2. B
    Zero
  3. C
    Two
  4. D
    Always linear
Question 22Single Answer
Boyle's temperature is where the virial coefficient B becomes ?
  1. A
    Zero
  2. B
    Maximum
  3. C
    Minimum
  4. D
    Undefined
Question 23Single Answer
Surface tension is the force per unit _____ acting along the surface?
  1. A
    Volume
  2. B
    Length
  3. C
    Mass
  4. D
    Area
Question 24Single Answer
Surface tension of a liquid with temperature?
  1. A
    Increases
  2. B
    Decreases
  3. C
    Is constant
  4. D
    Oscillates
Question 25Single Answer
One common method to measure surface tension is the method?
  1. A
    Drop-weight
  2. B
    Clapeyron
  3. C
    Langmuir adsorption
  4. D
    Dulong–Petit
Question 26Single Answer
The capillary rise method uses height of rise to calculate ?
  1. A
    Viscosity
  2. B
    Surface tension
  3. C
    Molar mass
  4. D
    Thermal conductivity
Question 27Single Answer
Surface tension is most accurately described as ?
  1. A
    Surface energy per unit area
  2. B
    Cohesive energy per mole
  3. C
    Interfacial mass
  4. D
    Sound absorption
Question 28Single Answer
Surfactants reduce surface tension by at interfaces?
  1. A
    Increasing pressure
  2. B
    Adsorbing
  3. C
    Reacting chemically
  4. D
    Increasing temperature
Question 29Single Answer
Surface tension acts to the surface area of liquids?
  1. A
    Increase
  2. B
    Maintain
  3. C
    Decrease
  4. D
    Oscillate
Question 30Single Answer
A meniscus in a glass tube is concave for liquids having surface tension less than their energy to glass?
  1. A
    Cohesive
  2. B
    Adhesive
  3. C
    Internal
  4. D
    Thermal
Question 31Single Answer
Surface tension affects phenomena like ?
  1. A
    Diffusion
  2. B
    Surface curvature and droplet formation
  3. C
    Electrical conduction
  4. D
    Magnetic resonance
Question 32Single Answer
NaCl crystals exhibit crystal system?
  1. A
    Tetragonal
  2. B
    Cubic
  3. C
    Hexagonal
  4. D
    Monoclinic
Question 33Single Answer
Born–Haber cycle helps determine energy of ionic solids?
  1. A
    Lattice
  2. B
    Sublimation
  3. C
    Ionization
  4. D
    Hydration
Question 34Single Answer
Einstein’s model assumes atoms vibrate ?
  1. A
    With zero-point energy only
  2. B
    Classically
  3. C
    Independently as quantum oscillators
  4. D
    As waves
Question 35Single Answer
Einstein’s heat capacity equation matches experimental data ?
  1. A
    Only at high temperatures
  2. B
    At all temperatures
  3. C
    Only at low temperatures
  4. D
    At absolute zero
Question 36Single Answer
Debye’s T³-law describes heat capacity of solids at ?
  1. A
    High temperature
  2. B
    Absolute zero only
  3. C
    Low temperature
  4. D
    Melting point
Question 37Single Answer
The number of independent crystal systems is ?
  1. A
    6
  2. B
    7
  3. C
    12
  4. D
    14
Question 38Single Answer
The lattice of an ionic crystal is characterized by arrangement of ions?
  1. A
    Regular repeating pattern
  2. B
    Random
  3. C
    Gas-like
  4. D
    Amorphous
Question 39Single Answer
Debye’s model treats vibration frequencies as ?
  1. A
    Single value
  2. B
    Zero
  3. C
    Continuous distribution
  4. D
    Discrete single frequency
Question 40Single Answer
Heat capacity at constant volume (Cv) of solids approaches at high temperature?
  1. A
    0
  2. B
    3R
  3. C
    R
  4. D
    10
Question 41Single Answer
The anomalies at low temperature are explained by ?
  1. A
    Quantum theory (Debye model)
  2. B
    Classical theories
  3. C
    Arrhenius equation
  4. D
    Fick's law
Question 42Single Answer
X-ray diffraction is used to determine ?
  1. A
    Melting point
  2. B
    Interplanar spacing
  3. C
    Gas constant
  4. D
    Surface tension
Question 43Single Answer
Bragg’s x-ray technique was first validated on crystals?
  1. A
    Quartz
  2. B
    Sulfur
  3. C
    Sodium chloride
  4. D
    Water ice
Question 44Single Answer
Atomic vibration frequency distribution is central to theory?
  1. A
    Maxwell
  2. B
    Debye
  3. C
    Bernoulli
  4. D
    Fourier
Question 45Single Answer
In ionic solids, lattice energy is released when ?
  1. A
    Crystal forms from gaseous ions
  2. B
    Solid sublimes
  3. C
    Gas dissolves
  4. D
    Surface tension measured
Question 46Single Answer
The E equals hv relationship pertains to spectroscopy?
  1. A
    UV-Vis only
  2. B
    X-ray only
  3. C
    X-ray and vibrational
  4. D
    Pressure diusion
Question 47Single Answer
X-ray diffraction can determine _____ of a unit cell?
  1. A
    Charge distribution
  2. B
    Geometry and dimensions
  3. C
    Mass
  4. D
    Viscosity
Question 48Single Answer
At room temperature, most solids obey law that heat capacity?
  1. A
    3R per mole of atoms
  2. B
    5R
  3. C
    Temperature dependent
  4. D
    Infinite
Question 49Single Answer
Colloids exhibit _____ Tyndall effect?
  1. A
    No
  2. B
    Strong
  3. C
    Only if colored
  4. D
    In pure water
Question 50Single Answer
Brownian motion in colloids results from ?
  1. A
    Electrical charge
  2. B
    Gravity
  3. C
    Thermal motion of solvent molecules
  4. D
    Magnetic field
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