Question

1. losing control of the fission reaction in a reactor core may result in

decreased daughter nuclid
alpha particles
a power surge
a meltdown

Explanation:

When a nuclear reactor loses control of its fission reaction, the uncontrolled chain reaction generates excessive heat. This extreme heat can melt the reactor core components, which is defined as a meltdown. Decreased daughter nuclei are not a result of lost control; alpha particles are normal decay products, not a consequence of uncontrolled fission; a power surge is a temporary spike, but the severe, direct outcome of lost fission control is a meltdown.

Answer:

a. a meltdown