What shares one quantum state?

• Lone unpaired ions
• The thermometers
• The Cooper pairs

What happens to flux inside a superconductor?

• It is frozen in place
• It is expelled
• It doubles in strength

The Meissner effect is more than just zero resistance.

Circle one:   True   False

How does pairing survive the repulsion between electrons?

• Repulsion switches off in winter
• Turn-taking avoids head-on meeting
• Electrons stop having charge

Cool a perfect conductor in a field. What happens to the field?

• Trapped inside
• It is expelled at once
• It turns into current

Why do ordinary bumps not scatter the pairs?

• Pairs hide under the Fermi level
• Bumps are forbidden by law
• They cannot pay the gap energy

A student says the gap causes pairing. What is backwards?

• Gaps forbid all pairing
• Pairing opens the gap
• Pairs destroy all gaps

A metal shows zero resistance but traps an applied field. Superconductor?

• Not by this test
• Yes, resistance is the only test
• Yes, trapping proves everything