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Answer 1

2. Zero vector  or null vector  means the vector having magnitude equal to zero(0). ... The x, y and z all component of the zero vector is zero. Graphically, zero vector  or null vector represent just a point whose starting point and terminating point is same .

3. Activity involving mental or physical effort done in order to achieve a result.

10. Amplitude is the fluctuation or displacement of a wave from its mean value. With sound waves , it is the extent to which air particles are displaced, and this amplitude of sound  sound amplitude is experienced as the loudness of sound.