Which model of the universe gives the youngest age for the present size of the universe? (Assume that the present expansion rate is the same for all of these models. The different models have different expansion histories.)
A) a recollapsing universe
B) a coasting universe
C) a critical universe
D) an accelerating universe
E) All models give the same age.
A) a recollapsing universe
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Refracting Telescope: Which one of the following is normally not a characteristic of a simple two-lens refracting astronomical telescope?
A. The angular size of the final image is larger than that of the object. B. The final image is virtual. C. The objective forms a virtual image. D. The final image is inverted.
If a power plant is 30% efficient, and the transmission system that delivers power to consumers is 60% efficient, then the overall efficiency is
A) 90%. B) 60%. C) 30%. D) 18%. E) none of the above
Which sugar is found in greater than normal amounts in the blood of a diabetic?
a. Sucrose b. Lactose c. Glucose d. Fructose
What happens after many generations of the star-gas-star cycle?
A) The heavy element abundance decreases; the amount of gas increases. B) The heavy element abundance increases; the amount of gas decreases. C) The heavy element abundance increases; the amount of gas stays the same. D) The amount of gas and heavy elements stay the same: it's a cycle. E) The heavy element abundance stays the same; the amount of gas decreases. F) The heavy element abundance increases; the amount of gas increases.