Self-Assessment Quiz: A History of Rocketry

Twenty questions on the arc from gunpowder to the commercial era, and on how each milestone connects to the physics of earlier chapters. Answer each before opening the key. Aim for 16 or more. Use $g_0 = 9.81\ \text{m/s}^2$.

Question 1

Gunpowder and the first rockets ("fire arrows") were invented in:

A) Germany B) China C) Russia D) India

Question 2

The rocket equation $\Delta v = v_e \ln(m_0/m_f)$ was first written down, in 1903, by:

A) Robert Goddard B) Hermann Oberth C) Konstantin Tsiolkovsky D) Wernher von Braun

Question 3

The world's first liquid-fueled rocket was flown in 1926 by:

A) Tsiolkovsky B) Goddard C) von Braun D) Sergei Korolev

Question 4

The V-2 (A-4) was primarily a:

A) satellite launcher B) suborbital ballistic missile C) two-stage orbital rocket D) crewed spacecraft

Question 5

The fundamental reason a gunpowder rocket cannot reach orbit is its:

A) low mass ratio B) low exhaust velocity C) lack of a guidance system D) excessive weight

Question 6

The first artificial satellite, Sputnik (1957), was launched by:

A) the United States B) the Soviet Union C) Germany D) a private company

Question 7

The first human to orbit the Earth, in April 1961, was:

A) Alan Shepard B) John Glenn C) Yuri Gagarin D) Neil Armstrong

Question 8

Apollo used lunar orbit rendezvous primarily because it:

A) was inherently safer than other schemes B) reduced the mission's total mass enough to fit on a single Saturn V C) was faster than flying straight to the surface D) avoided the need for re-entry

Question 9

The Space Shuttle's central unmet promise was:

A) reaching orbit at all B) cheap, routine, reusable access to space C) carrying humans D) deploying satellites

Question 10

The first orbital-class booster to land and then be reused was operated by:

A) NASA B) Blue Origin C) SpaceX D) Rocket Lab

Question 11

A sobering and unusual fact about the V-2 is that:

A) it never actually flew B) more people died building it (as slave labor) than were killed by it as a weapon C) it reached the Moon D) it was never used in the war

Question 12

"Operation Paperclip" refers to:

A) a Soviet lunar program B) the postwar transfer of German rocket engineers, including von Braun, to the United States C) a NASA satellite series D) an early Shuttle mission

Question 13 (True/False, justify)

"A rocket cannot work in the vacuum of space, because there is nothing for its exhaust to push against." True or false? Justify in one sentence, naming the relevant chapter.

Question 14 (True/False, justify)

"The V-2 reached space, so it was essentially an orbital rocket." True or false? Explain the difference between what it achieved and orbit.

Question 15 (True/False, justify)

"Reusability, as SpaceX practices it, violates the rocket equation." True or false? Explain.

Question 16 (True/False, justify)

"Chemical-rocket exhaust velocity has improved roughly tenfold since Goddard's day." True or false? Give the rough numbers.

Question 17 (Short answer)

Explain in one or two sentences why the V-2's ideal delta-v (~2.3 km/s) fell so far short of orbit, and name the two Chapter 3 remedies a rocket needs to close the gap.

Question 18 (Short answer)

The R-7 used a central core plus four strap-on boosters that dropped away after launch. Name this technique, and say why it let the R-7 reach orbit when the single-stage V-2 could not.

Question 19 (Short answer)

Compute the V-2's ideal delta-v from an exhaust velocity of $v_e = 2.0\ \text{km/s}$ and a mass ratio of $3.2$ (show the mass ratio and the logarithm).

Question 20 (Short answer)

In one or two sentences, explain what "history matters" (theme 6) means for a working engineer, using one concrete example from this chapter.

Answer Key

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