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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 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 :: 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 :: Energy and Momentum by kieke
A 55kg person walks up a staircase, and a second 55kg person runs up the staircase. Who develops more power and why?
  1. the person who walks up because he takes more time, using more energy
  2. the person who runs up because he takes less time
  3. same power for both because both cover the same distance with the same force
  4. not enough information to determine
Grade 12 :: Heat Transfer by tanyamajmudar
The change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus
  1. the amount of heat that is not conserved.
  2. the amount of work done by the system on its surroundings.
  3. the original internal energy.
  4. the volume difference.
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 :: Forces and Motion by tanyamajmudar
If a body goes from 10m/s to 50m/s in 8 seconds, what is its acceleration?
  1. [math]1.25m/s^2[/math]
  2. [math]5m/s^2[/math]
  3. [math]6.25m/s^2[/math]
  4. [math]40m/s^2[/math]
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