Question

Suppose a new planet is discovered between Uranus and Neptune.
Its time period would be
(a) less than that of Neptune.
(b) more than that of Neptune.
(c) equal to that of Neptune or Uranus.
(d) less than that of Uranus.


NCERT Class VIII
Science - Exemplar Problems

Chapter 17. Stars and Solar System

Answer 1

A ‘new planet’ is discovered between “Uranus and Neptune”. Its ‘time period’ would be less than that of Neptune.  

This is because Uranus is $2870 \times 10^{6}\ \mathrm{km}$ away from the Sun whereas Neptune is $4504 \times 10^{6}\ \mathrm{km}$ away.  

Therefore the distance of the new planet would be between $\bold{2870 \times 10^{6}\ \mathrm{km}}$ and $\bold{4504 \times 10^{6}\ \mathrm{km}}$ that is less than that of Neptune. Hence it will be option (a) correct here.  

Answer 2

Answer: less than Neptune

Explanation:

(a) less than Neptune