“Impurities” in plasma are a problem because they:

increase radiation losses and cool the plasma

increase fusion rate automatically

Which is most likely to stop fusion in a reactor?

major heat loss to walls / loss of confinement

“Magnetic confinement” mainly relies on the fact that charged particles:

move in curved paths around magnetic field lines

Practical fusion requires:

high temperature + sufficient density + enough confinement time

One major problem in magnetic confinement is:

plasma instabilities that can cause losses of confinement

plasma always stays perfectly stable

In inertial confinement fusion, the fuel is fused by:

compressing it extremely quickly (often with lasers)

Which statement is most accurate about temperature?

higher temperature increases collision energy and fusion probability

fusion works best at room temperature

lower temperature always increases fusion

The main reason fusion needs high temperature is to:

give nuclei enough kinetic energy to get close despite repulsion

A fusion reactor must heat and confine plasma while also:

removing heat safely and producing electricity

eliminating all neutrons from the universe

an ionized gas with free electrons and ions

Which are key fusion engineering challenges?

materials that handle high heat/particles

Nuclear Fusion Conditions Quiz: Explore Extreme Physics

Grade 11th

Reviewed by Ekaterina Yukhnovich

Ekaterina Yukhnovich, PhD |

Science Expert

Review Board Member

Ekaterina V. is a physicist and mathematics expert with a PhD in Physics and Mathematics and extensive experience working with advanced secondary and undergraduate-level content. She specializes in combinatorics, applied mathematics, and scientific writing, with a strong focus on accuracy and academic rigor.

, PhD

By Thames

Thames

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| Attempts: 15 | Questions: 20 | Updated: Mar 9, 2026