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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 3, Of Warps and Ripples.

Multiple Choice Questions

1. Edwin Hubble used Einstein's theories to show that the fabric of the universe _____.
(a) Has a finite boundary.
(b) Is not static, it must either be shrinking or expanding.
(c) Is not flat, it is curved, either inwards or outwards.
(d) Is uniform in all places and times.

2. According to Newton's theory of gravity, if two objects have a gravitational pull on one another, and one changes its mass or distance from the other, how quickly does the effect of this change travel to the other object?
(a) Instantaneously.
(b) At exactly the speed of light.
(c) Near the speed of light, faster for lighter objects.
(d) Near the speed of light, faster for more massive objects.

3. According to Einstein's theory of general relativity, if two objects have a gravitational pull on one another, and one changes its mass or distance from the other, how quickly does the effect of this change travel to the other object?
(a) Near the speed of light, faster for more massive objects.
(b) Near the speed of light, faster for lighter objects.
(c) Instantaneously.
(d) At exactly the speed of light.

4. In Einstein's famous equation, E=mc^2, what does "c" represent?
(a) The object's density.
(b) The frequency of light.
(c) The speed of light.
(d) The speed of the object.

5. According to general relativity, which of the following is said to warp or bend space-time?
(a) Constant, relativistic speed motion.
(b) Gravity and electromagnetic fields.
(c) Accelerated motion and orbital motion.
(d) Accelerated motion and gravity.

Short Answer Questions

1. Which of the following is a correct statement, based on the theory of special relativity?

2. According to Newton's law of gravity, the strength of the pull between two objects depends on what factors?

3. What is the result when a particle of matter and a particle of antimatter are brought into contact?

4. What type of a wave is light?

5. What is the shape of all particles, at the smallest possible level, according to string theory?

(see the answer key)

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