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Latest Bihar STET Chemistry Exam Question (Objective Questions), MCQ in English

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Question Bank Bihar STET Chemistry Exam Paper 2 - English
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Specific Subject (Chemistry)

Question 1Single Answer
The root mean square velocity of a gas is given by:
  1. A
    √(3RT/M)
  2. B
    √(2RT/M)
  3. C
    √(RT/M)
  4. D
    √(8RT/πM)
Question 2Single Answer
The most probable velocity of gas molecules is:
  1. A
    √(RT/M)
  2. B
    √(2RT/M)
  3. C
    √(3RT/M)
  4. D
    √(8RT/πM)
Question 3Single Answer
The average velocity of gas molecules is:
  1. A
    √(2RT/M)
  2. B
    √(8RT/πM)
  3. C
    √(3RT/M)
  4. D
    √(RT/2M)
Question 4Single Answer
For a gas at a given temperature, the correct order of molecular speeds is:
  1. A
    uₘₚ > uavg > urms
  2. B
    uavg > urms > uₘₚ
  3. C
    urms > uavg > uₘₚ
  4. D
    urms > uₘₚ > uavg
Question 5Single Answer
The ratio of RMS velocity to most probable velocity is:
  1. A
    √(2/3)
  2. B
    √(3/2)
  3. C
    √(8/3π)
  4. D
    √2
Question 6Single Answer
At constant temperature, RMS velocity is inversely proportional to:
  1. A
    Molar mass
  2. B
    Square of molar mass
  3. C
    Square root of molar mass
  4. D
    Pressure
Question 7Single Answer
If the absolute temperature of a gas becomes four times, its RMS velocity becomes:
  1. A
    Four times
  2. B
    Half
  3. C
    Twice
  4. D
    Unchanged
Question 8Single Answer
Mean free path is the average distance travelled by a molecule:
  1. A
    During one second
  2. B
    Before striking the vessel wall
  3. C
    Between two successive collisions
  4. D
    During liquefaction
Question 9Single Answer
The mean free path of gas molecules is inversely proportional to:
  1. A
    Temperature
  2. B
    Pressure
  3. C
    Volume
  4. D
    Molecular speed
Question 10Single Answer
Mean free path λ is inversely proportional to the:
  1. A
    Collision diameter
  2. B
    Cube of collision diameter
  3. C
    Square of collision diameter
  4. D
    Square root of collision diameter
Question 11Single Answer
The expression for mean free path in terms of number density n and molecular diameter d is:
  1. A
    1/(πd²n)
  2. B
    √2/(πdn)
  3. C
    1/(√2πd²n)
  4. D
    1/(2πd³n)
Question 12Single Answer
At constant pressure, the mean free path of an ideal gas is directly proportional to:
  1. A
    T
  2. B
    1/T
  3. C
    T²
  4. D
    √T
Question 13Single Answer
Collision diameter represents the:
  1. A
    Actual nuclear diameter
  2. B
    Effective diameter for molecular collision
  3. C
    Diameter of gas container
  4. D
    Mean free path
Question 14Single Answer
Real gases show maximum deviation from ideal behavior at:
  1. A
    High temperature and low pressure
  2. B
    Very low pressure only
  3. C
    High temperature and high vacuum
  4. D
    Low temperature and high pressure
Question 15Single Answer
An ideal gas obeys the gas equation:
  1. A
    PV = RT²
  2. B
    PV = nRT
  3. C
    P/V = nRT
  4. D
    PT = nRV
Question 16Single Answer
For one mole of a van der Waals gas, the equation is:
  1. A
    (P + a/V²)(V −
  2. B
    = RT
Question 17Single Answer
In the van der Waals equation, constant a accounts for:
  1. A
    Molecular volume
  2. B
    Intermolecular attraction
  3. C
    Molecular mass
  4. D
    Temperature correction
Question 18Single Answer
The van der Waals constant b is associated with:
  1. A
    Attractive forces
  2. B
    Ionization energy
  3. C
    Excluded molecular volume
  4. D
    Molecular velocity
Question 19Single Answer
A gas having a large value of van der Waals constant a has:
  1. A
    Weak intermolecular forces
  2. B
    Strong intermolecular attractive forces
  3. C
    Very small molecular size only
  4. D
    Ideal behavior at all pressures
Question 20Single Answer
For a van der Waals gas, the critical molar volume is:
  1. A
    b
  2. B
    3b
  3. C
    2b
  4. D
    4b
Question 21Single Answer
Critical pressure for a van der Waals gas is:
  1. A
    a/3b²
  2. B
    8a/27Rb
  3. C
    a/27b²
  4. D
    27a/b²
Question 22Single Answer
Critical temperature for a van der Waals gas is:
  1. A
    8a/27Rb
  2. B
    a/27Rb
  3. C
    27a/8Rb
  4. D
    a/Rb
Question 23Single Answer
The critical compressibility factor predicted by the van der Waals equation is:
  1. A
    1
  2. B
    3/8
  3. C
    1/2
  4. D
    8/3
Question 24Single Answer
At the critical point of a van der Waals gas:
  1. A
    (∂P/∂V)T = 0 only
  2. B
    Both first and second derivatives of P with respect to V are zero
  3. C
    (∂²P/∂V²)T = 0 only
  4. D
    Pressure is zero
Question 25Single Answer
The temperature above which a gas cannot be liquefied by pressure alone is called:
  1. A
    Boyle temperature
  2. B
    Inversion temperature
  3. C
    Critical temperature
  4. D
    Triple-point temperature
Question 26Single Answer
According to the law of corresponding states, gases behave similarly when compared at equal:
  1. A
    Reduced variables
  2. B
    Temperature and volume
  3. C
    Molecular masses
  4. D
    Collision diameters
Question 27Single Answer
Reduced temperature is defined as:
  1. A
    T/Tc
  2. B
    Tc/T
  3. C
    T − Tc
  4. D
    T + Tc
Question 28Single Answer
Reduced pressure is:
  1. A
    Pc/P
  2. B
    P/Pc
  3. C
    P − Pc
  4. D
    PPc
Question 29Single Answer
The Joule–Thomson coefficient is defined as:
  1. A
    (∂T/∂P)H
  2. B
    (∂P/∂T)V
  3. C
    (∂V/∂T)P
  4. D
    (∂H/∂T)P
Question 30Single Answer
The Joule–Thomson coefficient for an ideal gas is:
  1. A
    Positive
  2. B
    Negative
  3. C
    Zero
  4. D
    Infinite
Question 31Single Answer
During Joule–Thomson expansion, which quantity remains constant?
  1. A
    Internal energy
  2. B
    Enthalpy
  3. C
    Entropy
  4. D
    Temperature
Question 32Single Answer
A gas cools during Joule–Thomson expansion when μJT is:
  1. A
    Infinite
  2. B
    Negative
  3. C
    Zero
  4. D
    Positive
Question 33Single Answer
The temperature at which the Joule–Thomson coefficient becomes zero is called:
  1. A
    Boyle temperature
  2. B
    Critical temperature
  3. C
    Inversion temperature
  4. D
    Freezing temperature
Question 34Single Answer
The maximum inversion temperature predicted for a van der Waals gas is:
  1. A
    a/Rb
  2. B
    8a/27Rb
  3. C
    2a/Rb
  4. D
    a/27Rb
Question 35Single Answer
The Linde process of liquefaction primarily uses:
  1. A
    Joule–Thomson expansion
  2. B
    Isothermal compression only
  3. C
    Adiabatic compression only
  4. D
    Electrolysis
Question 36Single Answer
The de Broglie wavelength of a moving particle is given by:
  1. A
    λ = p/h
  2. B
    λ = h/p
  3. C
    λ = hp
  4. D
    λ = hE
Question 37Single Answer
The de Broglie relation establishes the:
  1. A
    Charge of electron
  2. B
    Wave nature of matter
  3. C
    Nuclear structure
  4. D
    Atomic number
Question 38Single Answer
According to de Broglie, wavelength is inversely proportional to:
  1. A
    Charge
  2. B
    Velocity only
  3. C
    Energy only
  4. D
    Momentum
Question 39Single Answer
For a particle of mass m moving with velocity v, de Broglie wavelength is:
  1. A
    hm/v
  2. B
    mv/h
  3. C
    hv/m
  4. D
    h/mv
Question 40Single Answer
The wave nature of electrons was experimentally demonstrated by:
  1. A
    Rutherford and Soddy
  2. B
    Davisson and Germer
  3. C
    Moseley and Bohr
  4. D
    Chadwick and Aston
Question 41Single Answer
The Davisson-Germer experiment involved diffraction of electrons by:
  1. A
    Sodium chloride solution
  2. B
    Nickel crystal
  3. C
    Graphite powder only
  4. D
    Hydrogen gas
Question 42Single Answer
Matter waves are associated with:
  1. A
    Atomic nuclei only
  2. B
    Stationary classical waves only
  3. C
    Photons only
  4. D
    Moving material particles
Question 43Single Answer
The de Broglie wavelength of a stationary particle is theoretically:
  1. A
    Equal to h
  2. B
    Zero
  3. C
    Infinite
  4. D
    Equal to its mass
Question 44Single Answer
For particles moving with equal velocity, de Broglie wavelength is larger for the particle having:
  1. A
    Smaller mass
  2. B
    Larger mass
  3. C
    Greater charge
  4. D
    Greater radius necessarily
Question 45Single Answer
The wave-particle duality applies to:
  1. A
    Matter only
  2. B
    Radiation only
  3. C
    Both radiation and matter
  4. D
    Neither
Question 46Single Answer
Heisenberg's uncertainty principle states that exact position and ______ cannot simultaneously be known.
  1. A
    Charge
  2. B
    Momentum
  3. C
    Mass
  4. D
    Spin
Question 47Single Answer
The uncertainty relation is:
  1. A
    ΔxΔp ≥ h/4π
  2. B
    ΔxΔp = 0
  3. C
    ΔxΔp ≤ h/4π
  4. D
    ΔxΔp = h
Question 48Single Answer
If uncertainty in position decreases, uncertainty in momentum:
  1. A
    Increases
  2. B
    Decreases
  3. C
    Remains zero
  4. D
    Remains exactly constant
Question 49Single Answer
Heisenberg's uncertainty principle is significant mainly for:
  1. A
    Bulk liquids
  2. B
    Macroscopic bodies only
  3. C
    Planets only
  4. D
    Microscopic particles
Question 50Single Answer
The uncertainty principle is a consequence of:
  1. A
    Nuclear fission
  2. B
    Wave nature of matter
  3. C
    Periodicity
  4. D
    Ionic bonding
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