Correct Answer : Counting the number of tree rings
Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed.
Correct Answer : 75
Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–76 years. Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and thus the only naked-eye comet that can appear twice in a human lifetime.
Correct Answer : Pluto
When Pluto was discovered in 1930 , it was called the ninth planet in our solar system, but its status as a fully fledged planet came into question in the 1990s. Pluto was officially reclassified as a dwarf planet in 2006 . The best-known dwarf planet, Pluto is also the largest in size and the second largest in mass.
Correct Answer : Fermi
This means that the nuclear radius is of the order of fermi. Hence, the most suitable unit for expressing nuclear radius is Fermi.
Correct Answer : Flavanoids
Correct Answer : Flourine
Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative.
Correct Answer : 118
Correct Answer : Cerebrum
Correct Answer : Mercury
Essentially because Mercury is closest to the Sun, when taking an average over time, Mercury is the closest planet to the Earth, and—in that measure—it is the closest planet to each of the other planets in the Solar System.
Correct Answer : Aristotle
