An educated scientific guess is a
A) hypothesis.
B) theory.
C) either of these
D) neither of these
Answer: A
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Over time, as they age, the habitable zone of stars like our Sun
A) move inward B) remain the same C) suddenly disappear D) move outward
Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?
A) salt water B) fresh water C) Buoyant force is the same in both. D) Cannot be determined from the information given.
Coherent light of a single frequency passes through a double slit with a separation d, to produce a pattern on a screen as distance D from the slits. What would cause the separation between adjacent minima on the screen to increase?
A. increase the index of refraction of the medium in which the setup is immersed B. increase the separation d between the slits C. increase the distance D D. increase the frequency of the incident light
What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) a layer of sediment laid down at that time which is littered with dinosaur fossils B) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years C) a layer of sediment laid down at that time which is rich in the element Iridium (Ir), an element common in asteroids but less common on the Earth D) the crater from this impact can still be seen in the deserts of Arizona