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Monday, April 6, 2009

unit 8

1. Which one of the following is influencing the properties of a nanomaterial
(A) surface effect (B) Seebeck effect (C) Compton effect (D) Peltier effect
2. The physics of nanotechnology is also called
(A) mesoscopic physics (B) macroscopic physics (C) microscopic physics (D) Atomic physics
3. If two dimensions are of nanosize, then it is called
(A) Quantum well (B) Quantum wire (C) Quantum dot (D) Thin film
4. An example for organic nanomaterial
(A) Fullerene (B) nanotube (C) Artificially synthesized DNA strands (D) Nano wire
5. In Nanomechanical bearings, molecules are
(A) diatomic (B) polycyclic (C) micron sized (D) none of theses
6. An example for low-friction rotational bearings
(A) Nested structure (B) polystructure (C) fullerene (D) Nanowire
7. An example for top down approach synthesis
(A) High energy ball milling (B) wet chemical method (C) plasma chemical method (D)sol gel method
8. Carbon nanotube contains
(A) 12 hexagonal and 20 pentagonal faces (B) 20 hexagonal and 12 pentagonal faces
(C) 20 hexagonal and 20 pentagonal faces (D 12 hexagonal and 12 pentagonal faces
9. Carbon nanotube is
(A) metallic (B) liquid (C) insulating (D) Gas
10. Size dependent laws which are used to compute the magnitudes of physical parameters for nanoscale systems from their macroscale counterpart
(A) laws of size (B) laws of motion (C) Scaling laws (D) nano laws
11. Ultrasonics are sound waves whose frequencies are greater than
(A) 20 kHz (B) 20 Hz (C) 2kHz (D) 2 Hz
12. Rigidity modulus is
(A) rVT2 (B)rVT (C) r2VT (D) VT2