quiz7s202 - b. equal number of atoms with opposite magnetic...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Quiz 7 1. The gap between valence band and conduction band is highest in
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a.metals b.semiconductors c.ionic compounds (c ) 2.In intrinsic semiconductors, the conductivity arises because a. electrons jump from valence band to conduction band b. electrons jump from higher energy levels in the conduction band c. donor atoms contribute electrons to the conduction band (a ) 3.The energy difference between the donor electron level and the conduction band compared to the band gap in a semiconductor is a. higher b. equal c. lower (c ) 4. Boron is valence 3 element. In silicon with valence 4, it is a a. donor b.acceptor c.neutral (both) (b ) 5. Match the following on the functionality of the two polymers a. Phenol formaldehyde . ............... 2 (b ) b. PVC. ..................................... >2 (a ) 6.Ferromagentic materials arise because a. equal number of electrons with opposite spins are present
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Unformatted text preview: b. equal number of atoms with opposite magnetic moment are present c. unequal number electrons with opposite spins are present in d shell (c ) 7. Thermosetting polymers are a. polymerize at higher temperature and can not be recycled b. polymerize but can be recycled c. polymers that show nonlinear elastic behavior (a ) 8. Electrical Transformers that convert high voltage to low voltage use a. paramagnetic materials b. diamgentic materials c. ferromagnetic materials . ................ (c) 9. For applications of magnetic materials, choose the correct answer a. soft magnets magnetic crane ( b) b. hard magnetics transformers (a ) 10. With increasing branching and cross-linking, the modulus of the polymer a. decreases less with increasing temperature b. softening is observed with increasing temperature c. viscosity at any temperature decreases (a ) 11. Bonus: If we have to redo the course, how would you like to do for the benefit of next batch:...
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quiz7s202 - b. equal number of atoms with opposite magnetic...

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