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Twelfth Grade (Grade 12) Physics Questions

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Grade 12 :: Matter by sladam06
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
  1. The ash has the same mass as the log, although a large percentage of it blows away.
  2. The law of conservation of mass applies to changes of state but not to chemical reactions.
  3. The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
  4. The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
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 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 :: 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]
Grade 12 :: Forces and Motion by tanyamajmudar
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 :: Forces and Motion by tanyamajmudar
If the acceleration of an object is negative, its velocity                    
  1. will be increasing.
  2. will be decreasing.
  3. will be zero.
  4. will be constant.
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.
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