How many powers of ten separate the diameter of the Solar System and the diameter of the Milky Way Galaxy?
A: 10.
B: 8.
C: 6.
D: 4.
E: 12.
Ans: B: 8.
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Resistance and Resistivity: The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A. It is increased by a factor of 2. B. It is increased by a factor of 4. C. It is reduced by a factor of 2. D. It is reduced by a factor of 4. E. It is reduced by a factor of 8.
Which of the following is an advantage that liquid water has as a biological solvent compared to other alternatives?
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