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Grade 12 Forces and Motion

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Grade 12 Energy and Momentum
A force applied to a body is said to do "work"
1. if the body is displaced in the direction of the applied force.
2. if the body is displaced in the direction opposite to the applied force.
3. even if the body does not move.
4. only when the body is moving.
Grade 12 Light and Optics
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
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 Fluid Mechanics
Grade 12 Fluid Mechanics
1. $DeltaU=Q+W$
2. $DeltaU=W-Q$
3. $DeltaU=Q-W$
4. $DeltaU=Q+2W$