Question : What are the components of the nucleus of an atom?

Option 1: Only protons

Option 2: Protons and neutrons

Option 3: Neutrons and electrons

Option 4: Only neutrons

Question : Cathode rays are a beams of:

Option 1: Neutrons

Option 2: Protons

Option 3: Positrons

Option 4: Electrons

Question : In nuclear reactors, moderators are used to?

Option 1: Accelerate neutrons

Option 2: Absorb the neutrons

Option 3: Slow down the neutrons.

Option 4: Generate neutrons

Question : What are the imaginary lines encircling the Earth horizontally called?

Option 1: Latitudes

Option 2: Longitudes

Option 3: Isobars

Option 4: Isotherms

Question : Which radioactive element with atomic number 43 in the modern periodic table is unstable, and the half-lives of all its isotopes are relatively short, from 4.2 million years to 5.0 s?

Option 1: Nobelium

Option 2: Promethium

Option 3: Neptunium

Option 4: Technetium