Except 'Calculator', all the others are stationary items that work mechanically, while calculator works electronically.

Except '27', all the others are prime numbers.

Except option (a), second word shows the higher intensity of first.

Except (c), all are produced by various glands inside the human body.

In all other pairs, the two words are antonyms to each other.

In all others, second is the part of first.

In all pairs except (c), both the words are antonyms to each other.

In all pairs except (b), second is made by first.

In all pairs except (c), second is the food for first.

In all other groups, there is a gap of two letters between second and third letters as in the alphabet.