Here, all except Sword are fire arms.

Here, all except Lotus are flowers, which grow on land while lotus is a water flower.

Here, all except Book are stationery items.

Here, all except Mathematics are branches of Mathematics.

Here, all except Tomato grow underground.

All except Eagle are flightless birds.

All except River contain stagnant water.

All except Arrow are used while holding in hand.

All except Universe form a part of the universe

All except Geography are science subject.

All except Brick are suits of cards.

All except Skeletons are synonyms and are concerned with superstitions.

Here, all except India are states of India.

All except Acre are units of measuring distance, while acre is a unit of area.

All except Pink are the colours seen in a rainbow.

All except X-ray are electronic media.

All except Vikramaditya were Mughal rulers.

All except Knight are religious persons, while knight is a warrior.

All except Columbus were astronomers, while Columbus was an explorer.