Dynamics make dynamo performance

Many pieces open with a soft dynamic. A positive opening is important to the listener and increases the player's confidence. Arrest the examiner's attention with a full, positive sound, not a small, mousy one. If it is marked piano, think of a soft white rabbit instead of a mouse and bump up the dynamic to mezzo-forte.
Bluff yourself as well as the examiner by playing out with a big, bold sound and with a wide range of dynamics and colour. Even if the composer marked little interest into the piece, add your own ideas. Be adventurous and imaginative. Why not make it your goal to turn that study which you thought was so boring into an interesting piece? Why not play the scales with a full, positive tone? Examiners love such enterprise.