Nanotechnology and Advanced Materials MCQs 2026

Nanoparticles have high surface area because

1. Asurface-to-volume ratio increases as size decreases✓
2. Bdensity becomes zero✓
3. Catoms disappear✓
4. Dgravity reverses✓

Carbon nanotubes exhibit

1. Aonly liquid state at room temperature always✓
2. Bhigh aspect ratio and remarkable mechanical properties✓
3. Czero carbon content✓
4. Donly ionic conductivity in vacuum only✓

Nanofiltration membrane rejects

1. Aonly suspended boulders✓
2. Bmultivalent ions and larger organics more than monovalent ions✓
3. Conly sound waves✓
4. Donly light photons✓

High surface area nano-catalyst improves

1. Arate by more active sites per mass✓
2. Bonly color of product always✓
3. Conly pipe roughness✓
4. Donly concrete curing✓

Quantum size effects appear when

1. Aparticle is macroscopic boulder✓
2. Bonly in bulk steel plate✓
3. Cparticle size approaches exciton Bohr radius scale✓
4. Donly in distillation column trays✓