If you stand closer to a concave mirror than a distance of one focal length, the image you see is
A. real and inverted.
B. real and upright.
C. virtual and inverted.
D. virtual and upright.
E. none of the above because you do not get an image.
Answer: D
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Consider the two surfaces shown below. They are both immersed in a uniform vertical electric field. (The tile vectors shown are for a typical tile on each surface.) 
For which surface is the value of 
larger?
A. The horizontal surface. B. The tilted surface. C. The value is the same nonzero number for both. D. The value is zero for both surfaces. E. One cannot compare the values from what is given.
An empty spice bottle has an inner volume of 1.31 × 10^-4 m3 . It has a mass of 112 g when filled with air, and it displaces 1.63 × 10^-4 m3 of water when fully submerged. What volume of mercury (rHg = 13.6 × 10^3 kg/m3) must be added to the empty bottle so that it will just submerge?
a. 3.75 cm3 b. 12.0 cm3 c. 101 cm3 d. 147 cm3 e. 237 cm3
Suppose that we allow an ideal gas containing N molecules to expand slowly and adiabatically to twice its initial volume. By what factor does its multiplicity increase?
A. By a factor of 2. B. By a factor of 2N. C. The multiplicity does not change. D. The answer depends on the gas’s initial volume. E. The answer depends on the gas’s initial energy.
All heavy elements are made during supernova events
Indicate whether the statement is true or false