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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 :: Thermodynamics by teachchemistry
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 :: 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
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 :: Waves and Sound by tanyamajmudar
What is the frequency range of human hearing?
  1. 20 hertz to 20 kilohertz
  2. 2 hertz to 20 hertz
  3. 20 hertz to 200 hertz
  4. 2 hertz to 200 hertz
Grade 12 :: Thermodynamics by teachchemistry
Grade 12 :: Thermodynamics by teachchemistry
Which of the following expressions correctly characterizes an isolated system?
  1. [math]∆U<0[/math]
  2. [math]∆U=0[/math]
  3. [math]∆U>0[/math]
  4. None of the above
Grade 12 :: Thermodynamics by teachchemistry
In which of the following cases would [math]∆U[/math] in [math]∆U=Q+W[/math] be less than zero?
  1. Work is done on the system
  2. Work is done by the system
  3. The magnitudes of heat and work are equivalent
  4. The magnitude of heat is greater than that of the work
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