Buoyancy: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the buoyant force B on this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
Answer: B
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Molecular Bonds: Van der Waals bonding is due to
A. the sharing of electrons between atoms. B. the transfer of electrons between atoms. C. unequal charge distribution around neutral molecules. D. atoms bonding to hydrogen molecules.
An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level
A) rises. B) falls. C) remains unchanged.
Zoned sequences of minerals are a characteristic of
A) contact metamorphism. B) regional metamorphism. C) foliated metamorphism. D) mechanical deformation.
What happens when the electron in a hydrogen atom flips its direction of spin, from parallel to anti parallel to that of the proton?
A. Nothing, this transition never occurs. B. The atom emits high-energy ultraviolet rays. C. The atom emits 656-nm radiation that gives red color. D. The atom emits 21-cm radio radiation.