Which of these is correct?
A) a piece of solid iron floats in molten iron.
B) a piece of solid aluminum floats in molten aluminum.
C) a piece of ice floats in water.
D) all the above
E) none of the above
Answer: C
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About how many stars are visible on a clear, dark night with the naked eye alone?
A) a few dozen B) a few hundred C) a few thousand D) tens of thousands E) millions and millions
The "father" of atomic materialism was
A) Plato. B) Ptolemy. C) Kepler. D) Democritus. E) Newton.
The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the magnification of this glass for this person when his eyes are focused at infinity?
A) 1.7 B) 2.7 C) 3.7 D) 4.7 E) 5.7
A(n) ____________________ is the distance that light would travel in one year?
Fill in the blank(s) with correct word