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# The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest For… Test | Final Test - Easy

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This test consists of 15 multiple choice questions and 5 short answer questions.

## Multiple Choice Questions

1. How many dimensions are necessitated by M-theory?
(a) Eight.
(b) Eleven.
(c) Ten.
(d) Nine.

2. In string theory, how do strings interact?
(a) By resonating with each other.
(b) By joining and splitting.
(d) By colliding and tangling.

3. What is one of the difficulties in determining the shape of the Calabi-Yau space?
(a) There are an infinite number of unknowns in its governing equation.
(b) No field of mathematics exists to support it.
(c) The equations governing its shape are too complex.
(d) The shape has an unequal number of real and imaginary dimensions.

4. Which of the following most accurately describes the state of the universe?
(a) It is about to begin contracting.
(b) It is mostly static.
(c) It is expanding.
(d) It is collapsing.

5. Who posited the existence of M-theory?
(a) Greene.
(b) Brandenberger.
(c) Witten.
(d) Plesser.

6. There are many possible Calabi-Yau spaces, but only shapes with which of the following characteristics are considered real possibilities?
(a) Those that solve the perturbation theory.
(b) Those that meet the vibration requirements and have an appropriate number of dimensions.
(c) Those that unify the four forces and have no extended dimensions.
(d) Those that have no time-dimensions.

7. According to modern physics, which of the following may cease to exist at the center of a black hole?
(a) Time.
(b) Strings.
(c) Energy.
(d) Space.

8. Why can the objects predicted by string theory not be observed?
(a) The objects are not composed of matter.
(b) Light does not exist at the scales involved.
(c) Current magnification is at least 17 times too wide.
(d) The objects exist only in other dimensions.

9. The horizon problem is the contradiction that which of the following properties of the universe shouldn't be uniform, but is?
(a) The gravitational constant.
(b) The electroweak field depth.
(c) The cosmic background radiation.
(d) The cosmological constant.

10. Which of the following is NOT a property that is used to define both black holes and elementary particles?
(a) Force charge.
(b) Spin.
(c) Mass.
(d) Half-life.

11. What does the second law of thermodynamics state about entropy for a closed system?
(a) It always decreases.
(b) It varies with external temperature.
(c) It is conserved, and never changes.
(d) It always increases.

12. Which of the following is true regarding our current knowledge of the Calabi-Yau space?
(a) Its shape is not fully known.
(b) Its shape is totally unknown.
(c) Its shape is completely known and defined.
(d) Physicists and mathematicians disagree about its shape.

13. In M-theory, what role does duality play?
(a) It links electromagnetism and gravity.
(b) It helps to incorporate general relativity.
(c) It shows that the five theories are connected.
(d) It allows space-tearing flop transitions to extend into extra dimensions.

14. Which of the following is true regarding the tearing of space-time according to string theory?
(a) It is not known if space-time can tear.
(b) A tear would destroy the universe.
(c) It can tear under special circumstances.
(d) It cannot tear.

15. What is the traditional method of testing theories in physics?
(a) Experimentation.
(b) Consensus.
(c) Debate.
(d) Mathematical proof.

## Short Answer Questions

1. What is the scientific state of the "multiverse" theory?

2. What property of both black holes and elementary particles is still unknown?

3. What did Stephen Hawking prove regarding black holes?

4. According to the standard model of the big bang, which of the following is true of the four fundamental forces during the first moments of the universe?

5. What type of a string can be massless?

(see the answer keys)

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