Consider the following statements in respect of a jet engine and a rocket : 1. A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space. 2. A rocket carries its own supply of oxygen in the gas form, and fuel. Which of the statements given above is/are correct?

Statement 1 is correct: conventional jet (air-breathing) engines obtain their oxidizer from atmospheric oxygen and therefore cannot operate in the vacuum of space where there is no air to ingest [1]. Statement 2 is imprecise and thus incorrect as written: rockets do carry their own oxidizer and fuel so they can operate without atmospheric oxygen, but the oxidizer is typically stored as a liquid or as part of a solid propellant, not generally as a gas; for example, liquid oxygen (LOX) is a common rocket oxidizer and rocket designs store fuel and oxidizer in dedicated tanks or as a solid mixture [3].

Sources

1. [1] https://www.sciencedirect.com/topics/earth-and-planetary-sciences/air-breathing-engine
2. [2] https://eaglepubs.erau.edu/introductiontoaerospaceflightvehicles/chapter/rocket-engines/
3. [3] https://www.sciencedirect.com/topics/physics-and-astronomy/solid-propellant