Which one of the following will come at the place of question mark $(?)$
$25 : 630 :\, : 10 :$ ?

Choose the correct alternative for the word belongs to the same group.

Which of the following is the same as Radium, Polonium, Uranium ?

Choose the correct alternative for the given relation.

Meadow : Sheep.

Choose the correct alternative for the given relation.

Penology : Punishment : : Seismology : ?

Choose the correct alternative for the given relation.

Deciduous : Willow : : Coniferous : ?

Magnalium is to aluminium as brass is to........