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Latest HPRCA PGT Teacher Chemistry Exam Question (Objective Questions), MCQ in English

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Question Bank HPRCA PGT Teacher (Chemistry) Exam - English
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Chemistry

Question 1Single Answer
The ultraviolet catastrophe in black body radiation was explained by?
  1. A
    Classical physics
  2. B
    Heisenberg’s principle
  3. C
    Bohr’s model
  4. D
    Planck’s quantum hypothesis
Question 2Single Answer
Planck’s quantum theory states that energy is emitted or absorbed in?
  1. A
    Discrete packets called quanta
  2. B
    Continuous manner
  3. C
    Only waves
  4. D
    Infinite amounts
Question 3Single Answer
The energy of a quantum of radiation is given by?
  1. A
    E = ½ mv²
  2. B
    E = mc²
  3. C
    E = hν
  4. D
    E = λν
Question 4Single Answer
Wien’s displacement law relates?
  1. A
    Energy and frequency
  2. B
    Wavelength of maximum intensity and temperature
  3. C
    Mass and velocity
  4. D
    Position and momentum
Question 5Single Answer
Stefan-Boltzmann law states that total energy radiated by a black body is proportional to?
  1. A
    T²
  2. B
    T
  3. C
    T⁴
  4. D
    1/T
Question 6Single Answer
The photoelectric effect demonstrates?
  1. A
    Dual nature of electron
  2. B
    Wave nature of light only
  3. C
    Particle nature of light
  4. D
    Uncertainty principle
Question 7Single Answer
In photoelectric effect, the kinetic energy of ejected electron depends on?
  1. A
    Work function only
  2. B
    Intensity of light only
  3. C
    Frequency of incident light
  4. D
    Temperature
Question 8Single Answer
Threshold frequency is the?
  1. A
    Frequency of emitted light
  2. B
    Maximum frequency
  3. C
    Minimum frequency required to eject electron
  4. D
    Frequency of black body
Question 9Single Answer
Einstein’s photoelectric equation is?
  1. A
    Δx · Δp ≥ h/4π
  2. B
    E = mc²
  3. C
    λ = h/p
  4. D
    hν = hν₀ + ½ mv²_max
Question 10Single Answer
Photoelectric effect cannot be explained by?
  1. A
    Quantum theory
  2. B
    Particle theory of light
  3. C
    Wave theory of light
  4. D
    Planck’s law
Question 11Single Answer
de Broglie proposed that matter has?
  1. A
    Only particle nature
  2. B
    Dual nature (wave and particle)
  3. C
    Only wave nature
  4. D
    No nature
Question 12Single Answer
de Broglie wavelength is given by?
  1. A
    λ = c/ν
  2. B
    λ = hν
  3. C
    λ = h / p
  4. D
    λ = E/h
Question 13Single Answer
de Broglie relation was experimentally verified by?
  1. A
    Bohr
  2. B
    Planck
  3. C
    Einstein
  4. D
    Davisson and Germer
Question 14Single Answer
For macroscopic objects, de Broglie wavelength is?
  1. A
    Negligible
  2. B
    Very large
  3. C
    Equal to light
  4. D
    Infinite
Question 15Single Answer
Bohr’s model was proposed for?
  1. A
    Ions only
  2. B
    Multi-electron atoms
  3. C
    Molecules only
  4. D
    Hydrogen atom
Question 16Single Answer
In Bohr’s model, angular momentum is quantized as?
  1. A
    Δx · Δp = h
  2. B
    mvr = h
  3. C
    E = nhν
  4. D
    mvr = nh/2π
Question 17Single Answer
The radius of nth orbit in Bohr’s model is proportional to?
  1. A
    1/n
  2. B
    n
  3. C
    n²
  4. D
    1/n²
Question 18Single Answer
Energy of electron in Bohr’s orbit is?
  1. A
    E = –13.6 / n² eV
  2. B
    E = 13.6 n² eV
  3. C
    E = hν
  4. D
    E = hc/λ
Question 19Single Answer
Spectral lines in hydrogen atom are explained by?
  1. A
    Only de Broglie
  2. B
    Classical physics
  3. C
    Bohr’s model
  4. D
    Heisenberg
Question 20Single Answer
Sommerfeld’s extension of Bohr’s model introduced?
  1. A
    Elliptical orbits
  2. B
    Only circular orbits
  3. C
    Wave nature
  4. D
    Uncertainty
Question 21Single Answer
Sommerfeld introduced?
  1. A
    Spin quantum number
  2. B
    Principal quantum number only
  3. C
    Azimuthal quantum number
  4. D
    Magnetic quantum number only
Question 22Single Answer
Limitation of Bohr’s model is?
  1. A
    Includes wave nature
  2. B
    Explains all spectra
  3. C
    No quantization
  4. D
    It fails for multi-electron atoms
Question 23Single Answer
Old quantum theory could not explain?
  1. A
    Energy levels
  2. B
    Hydrogen spectrum
  3. C
    Quantization
  4. D
    Fine structure of spectral lines completely
Question 24Single Answer
Heisenberg’s uncertainty principle states?
  1. A
    Position and momentum can be known exactly
  2. B
    Δx · Δp ≤ h/4π
  3. C
    ΔE · Δt = 0
  4. D
    Δx · Δp ≥ h/4π
Question 25Single Answer
Physical significance of uncertainty principle is?
  1. A
    Particles have definite paths
  2. B
    It is impossible to determine both position and momentum precisely simultaneously
  3. C
    Energy is continuous
  4. D
    No effect on microscopic particles
Question 26Single Answer
Uncertainty principle applies significantly to?
  1. A
    Microscopic particles
  2. B
    Macroscopic objects
  3. C
    Only light
  4. D
    Only waves
Question 27Single Answer
For an electron, if position is known precisely, then?
  1. A
    Momentum is known exactly
  2. B
    Momentum becomes highly uncertain
  3. C
    No change
  4. D
    Energy is zero
Question 28Single Answer
Black body is a perfect?
  1. A
    Reflector
  2. B
    Absorber and emitter of radiation
  3. C
    Transparent body
  4. D
    Only absorber
Question 29Single Answer
Rayleigh-Jeans law failed at?
  1. A
    Visible region only
  2. B
    Long wavelengths
  3. C
    All wavelengths
  4. D
    Short wavelengths (UV catastrophe)
Question 30Single Answer
Planck’s constant h has unit?
  1. A
    Joule
  2. B
    Joule second
  3. C
    Meter
  4. D
    Second
Question 31Single Answer
Photoelectric effect was explained by?
  1. A
    Bohr
  2. B
    Planck
  3. C
    Einstein
  4. D
    de Broglie
Question 32Single Answer
Work function is?
  1. A
    Minimum energy to eject electron
  2. B
    Maximum kinetic energy
  3. C
    Frequency of light
  4. D
    Wavelength
Question 33Single Answer
Intensity of light affects?
  1. A
    Stopping potential
  2. B
    Kinetic energy of photoelectrons
  3. C
    Threshold frequency
  4. D
    Number of photoelectrons
Question 34Single Answer
Stopping potential depends on?
  1. A
    Intensity only
  2. B
    Frequency of light
  3. C
    Work function only
  4. D
    Temperature
Question 35Single Answer
de Broglie wavelength is inversely proportional to?
  1. A
    Momentum
  2. B
    Energy
  3. C
    Mass only
  4. D
    Velocity only
Question 36Single Answer
Bohr’s model could not explain?
  1. A
    Quantized energy
  2. B
    Hydrogen spectrum
  3. C
    Zeeman and Stark effect
  4. D
    Circular orbits
Question 37Single Answer
Sommerfeld’s model used?
  1. A
    Relativistic correction for elliptical orbits
  2. B
    Only non-relativistic
  3. C
    No orbits
  4. D
    Wave mechanics
Question 38Single Answer
In Bohr-Sommerfeld model, the quantum condition for radial motion is?
  1. A
    Only angular
  2. B
    mvr = nh/2π only
  3. C
    No quantization
  4. D
    ∮ p_r dr = n_r h
Question 39Single Answer
Limitation of old quantum theory is?
  1. A
    Explained everything
  2. B
    It could not explain spectra of multi-electron atoms
  3. C
    No quantization
  4. D
    Included wave nature fully
Question 40Single Answer
Heisenberg uncertainty principle was proposed in?
  1. A
    1924
  2. B
    1913
  3. C
    1900
  4. D
    1927
Question 41Single Answer
The product Δx · Δp is minimum when?
  1. A
    h
  2. B
    Zero
  3. C
    Infinite
  4. D
    Equal to ħ/2
Question 42Single Answer
Uncertainty in energy and time is?
  1. A
    ΔE = 0
  2. B
    ΔE · Δt ≤ h/4π
  3. C
    ΔE · Δt ≥ h/4π
  4. D
    No relation
Question 43Single Answer
Black body radiation spectrum peaks at?
  1. A
    Only visible
  2. B
    Fixed wavelength
  3. C
    No peak
  4. D
    Wavelength inversely proportional to temperature
Question 44Single Answer
Photoelectric current is proportional to?
  1. A
    Frequency
  2. B
    Intensity of light
  3. C
    Wavelength
  4. D
    Work function
Question 45Single Answer
de Broglie hypothesis bridged?
  1. A
    No bridge
  2. B
    Only classical physics
  3. C
    Only quantum
  4. D
    Wave and particle nature
Question 46Single Answer
In Bohr’s model, frequency of radiation is?
  1. A
    ν = h/E
  2. B
    ν = (E₂ – E₁)/h
  3. C
    ν = c/λ only
  4. D
    No frequency
Question 47Single Answer
Sommerfeld introduced?
  1. A
    Only principal quantum number
  2. B
    Fine structure constant
  3. C
    Spin
  4. D
    No new number
Question 48Single Answer
Old quantum theory failed because?
  1. A
    No failure
  2. B
    Fully quantum
  3. C
    It was semi-classical and could not explain intensity of lines
  4. D
    Explained multi-electron atoms
Question 49Single Answer
Uncertainty principle shows?
  1. A
    Particles have fixed path
  2. B
    No limitation
  3. C
    Limitations of classical concepts at atomic level
  4. D
    Energy is continuous
Question 50Single Answer
The photoelectric effect supports?
  1. A
    No theory
  2. B
    Wave theory fully
  3. C
    Only classical
  4. D
    Quantum theory of light
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