AP PGECET 2026 Geo Engineering and Geo Informatics Question Paper: Download Answer Key with Solutions

AP PGECET Questions

• 1.

  Why is the equilibrium constant (K) temperature-dependent?
  

  • Because $\Delta G^\circ$ depends on T
    
  • Because pressure affects K
    
  • Because entropy is temperature-independent
    
  • Because fugacity coefficients change with T
    
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• 2.

  The change in enthalpy of a system is related to the heat absorbed at a:
  

  • Constant volume
    
  • Constant temperature
    
  • Constant mole fraction
    
  • Constant pressure
    
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• 3.

  The absolute humidity of air at 101.325 kPa is measured to be 0.02 kg of water per kg of dry air. Then the partial pressure of water vapour in the air is:
  

  • 1.99 kPa
    
  • 2.55 kPa
    
  • 3.16 kPa
    
  • 3.87 kPa
    
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• 4.

  Which statement about entropy is incorrect?

  • Entropy is zero at 0 K (Third Law)
    
  • Entropy decreases in spontaneous adiabatic processes
    
  • Entropy production is irreversible
    
  • Entropy measures energy dispersal
    
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• 5.

  The entropy of single crystalline Silicon at absolute zero will be:
  

  • 2
    
  • 1
    
  • 0
    
  • 10
    
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• 6.

  1 mole of Argon gas is heated at constant pressure from 200 K to 600 K.
  If \( C_p = 4\ \text{cal} \cdot \text{deg}^{-1} \cdot \text{mol}^{-1} \), then the change in entropy will be:
  (Given \( \ln 3 = 1.09 \))
  

  • 4.36 Cal.deg$^{-1}$mol$^{-1}$
    
  • 2.76 Cal.deg$^{-1}$mol$^{-1}$
    
  • 3.34 Cal.deg$^{-1}$mol$^{-1}$
    
  • 5.39 Cal.deg$^{-1}$mol$^{-1}$
    
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