Question

What color light is reflected by colourless object?

Answer 1

Reflection of coloured light by colourless objects depends on the which colour is being incident on it.
Like if white light falls on it; it will reflect white light.
If red, blue or any other kind of light falls on it; it will reflect the same light.
They have no such colour of their own. 

Answer 2

the colour of light which falls on the colourless object get reflected and remains in the same colour .