Thermal Expansion: Two metal spheres are made of the same material and have the same diameter, but one is solid and the other is hollow. If their temperature is increased by the same amount,
A. the solid sphere becomes bigger than the hollow one.
B. the hollow sphere becomes bigger than the solid one.
C. the two spheres remain of equal size.
D. the solid sphere becomes denser and the hollow one less dense.
E. the solid sphere becomes less dense and the hollow one denser.
Answer: C
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Doppler Effect: In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls. If the physical situation is portrayed correctly, from the vantage point of an observer at the foot of the cliff, the pitch of the scream as he falls should be
A. higher than the original pitch and constant. B. higher than the original pitch and increasing as he falls. C. lower than the original pitch and constant. D. lower than the original pitch and decreasing as he falls. E. It is impossible to predict.
Consider the field lines of the electric dipole in this diagram, relative to the w-axis and the z-axis. 
In which direction does the electric field point where the two axes intersect?
A. 45° up and to the right, parallel to the z-axis: 
B. 45° down and to the left, parallel to the z-axis: 
C. 45° down and to the right, parallel to the w-axis: 
D. 45° up and to the left, parallel to the w-axis: 
Distinguish between solvent and solute
Simple Pendulum: A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How would the period of the pendulum change if the supporting chain were to break, putting the elevator into freefall?
A. The period does not change. B. The period increases slightly. C. The period decreases slightly. D. The period becomes zero. E. The period becomes infinite because the pendulum would not swing.