Some recent evidence points to the possibility of there being some liquid water on Mars "recently." Why does this puzzle astronomers?
A. Currently Mars is too hot for liquid water.
B. The Martian atmosphere is too cold and has too low a pressure for liquid water.
C. The Martian atmosphere is too thick, and clouds would form.
D. All of these choices are correct.
Answer: B
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Which of the following statements about novae is not true?
A) The word nova means "new star" and originally referred to stars that suddenly appeared in the sky, then disappeared again after a few weeks or months. B) When a star system undergoes a nova, it brightens considerably, but not as much as a star system undergoing a supernova. C) Our Sun will probably undergo at least one nova when it becomes a white dwarf about 5 billion years from now. D) A star system that undergoes a nova may have another nova sometime in the future. E) A nova involves fusion taking place on the surface of a white dwarf.
Which of the following colors has the shortest wavelength?
A. Yellow B. Red C. Orange D. Green
A 2.00-qt bottle of soda is on sale for $1.29. What should be the price of a 2.00-L bottle of the same soda to yield the same value? (1.00 qt = 0.947 L)
What will be an ideal response?
Which of the following statements is correct?
1.If an equation is dimensionally correct it must be true and if it is not dimensionally correct it may be true. 2.If an equation is dimensionally correct it may be true and if an equation is not dimensionally correct it may be true. 3.If an equation is dimensionally correct it may be true and if it is not dimensionally correct then it cannot be true. 4.If an equation is dimensionally correct it must be true and if an equation is not dimensionally correct it cannot be true.