Multiple choice What are nanofluids? Fluids which are filled in nanosize devices Mixture of different fluids in nano quantities Fluids with suspensions of solid nano-particles None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation Nanofluids are engineered colloidal suspensions of nanoparticles in a base fluid. The nanoparticles used in nanofluids are typically made of metals, oxides, carbides or carbon nanotubes.