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Twelfth Grade (Grade 12) Physics Questions

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Grade 12 Energy and Momentum
A 55 kg person walks up a staircase, and a second 55 kg 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 Quantum Physics and the Atom
Compton Scattering involves what kind of energy?
  1. low energy x-rays
  2. doesn't use any energy
  3. moderate energy x-rays
  4. very high energy x-rays
Grade 12 Energy and Momentum
Grade 12 Matter
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 Forces and Motion
Grade 12 Forces and Motion
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 Forces and Motion
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

This question is a part of a group with common instructions. View group »

Weight is a measure of
  1. your mass.
  2. the gravitational attraction between you and the earth.
  3. mechanical equilibrium
  4. all of these
  5. none of these
Grade 12 Forces and Motion
What is the definition of acceleration?
  1. An object's resistance to motion
  2. How fast
  3. How much stuff (matter) is in an object
  4. The change in velocity over time
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
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