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Which of the following forces are conservative?

(a) Coulomb force between charged particles at rest.
(b) Force of a compressed elastic spring.
(c) Gravitational force between two masses.
(d) Frictional force.

Chemistry

The mass of NaBrO₃ required to prepare 150 mL of 0.75N of a solution based on the reaction
is
(a) 1.42 g (b) 2.83 g (c) 3.85 g (d) 4.25 g

Mathematics

Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. The number of words which have at least one of their letters repeated is
(a) 69760 (b) 30240 (c) 99748 (d) None of these

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