Question

We live in an age of nuclear weapons. When an atom of uranium - $235$ splits, it releases nuclear particles. These particles lead to great destruction, in the circumstances when:

• A. an uncontrolled chain reaction occurs
• B. a volcano of heat is evolved
• C. there is a controlled chain reaction
• D. cosmic rays accompany them with shock waves and fire

Answer 1

The correct option is A an uncontrolled chain reaction occurs

When an atom of uranium - 235 splits, it releases nuclear particles and the process is known as nuclear fission. In an uncontrolled nuclear fission, vast amount of energy in uncontrolled manner is released causing destruction.