Questions

Dull means not sharp, not shining, not bright, ...

Hence, the given words are all that means the opposite of dull.

A tendon is a fibrous connective tissue which is Tough, fibrous, cord-like tissue that connects muscle to bone or another structure, such as an eyeball. Tendons help the bone or structure to move.

Direct method,

 Subtraction method,

 Modulo-Division method,

 Digit-Extraction method,

 Mid-Square method,

 Folding method,

Pseudo-random method

Jawaharlal Nehru is the author of the book The Discovery of India

Here Soda is a Heterogenous Mixture.

A Heterogeneous Mixture is a mixture having a non-uniform composition i.e, the mixture contains components in different phases. Using various means, the parts in the mixture can be separated from one another.