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Twelfth Grade (Grade 12) Physics Questions

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Grade 12 :: Thermodynamics by teachchemistry
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
  1. [math]DeltaU=Q+W[/math]
  2. [math]DeltaU=W-Q[/math]
  3. [math]DeltaU=Q-W[/math]
  4. [math]DeltaU=Q+2W[/math]
Grade 12 :: Light and Optics by tanyamajmudar
What occurs when the angle of incidence of a light ray is greater than the critical angle?
  1. critical refraction
  2. total internal reflection
  3. total external reflection
  4. dispersion
Grade 12 :: Thermodynamics by radiance
If [math]DeltaS[/math] denotes entropy change, then what is the entropy change for a reversible adiabatic process?
  1. [math]DeltaS = 0[/math]
  2. [math]DeltaS = 1[/math]
  3. [math]Delta S < 1[/math]
  4. [math]DeltaS >1[/math]
Grade 12 :: Thermodynamics by teachchemistry
Grade 12 :: Thermodynamics by radiance
Grade 12 :: Thermodynamics by radiance
According to second law of thermodynamics, heat energy cannot be completely converted into useful work owing to
  1. the entropy of the system
  2. the enthalpy of the system
  3. the internal energy of the system
  4. the translational energy of the system
Grade 12 :: Thermodynamics by radiance
Grade 12 :: Thermodynamics by radiance
Grade 12 :: Thermodynamics by radiance
Which of the following conditions represents "standard state free energy of reaction" for a spontaneous reaction?
  1. [math]DeltaG^0 > 0[/math]
  2. [math]DeltaG^0 < 0[/math]
  3. [math]DeltaG^0 = 0[/math]
  4. [math]DeltaG^0 > 1[/math]
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