Choose the correct alternative:
i)Acceleration due to gravity increases/decreases with increasing altitude.
ii)Acceleration due to gravity increases/decreases with increasing depth.
iii)The total energy of an orbiting satellite is negative of its kinetic/potential energy.
iv)The polar satellite go around the earth in a north-south direction/east-west direction.

Choose the correct alternative: When a conservative force does positive work on a body, the potential energy of the body increases/decreases/remains inaltered.

The acceleration due to gravity may vary with altitude and depth. Why does satellite need no fuel to go around a planet in its fixed orbit.

All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. The base strengthening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however ,more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. What is the order of basicity of I. p-methylaniline II. m-methylaniline III, aniline IV. o-methylaniline

The quantum numbers n and l of four electrons are given: (i) n=4, l=1" " (ii) n=4, l=0" " (iii) n=3, l=2 " (iv) "n=3, l=1 The correct order of increasing energy for the orbitals is