Solapur University M.Sc Nano Technology (Semester-III) Paper on Organic Semiconductors, Polymers and Molecular Electronics in everyday life March 2019
| Sr. No. | Question |
| 1 | An S orbital is ________with its centre at the nucleus.
(a) Square (b) Rectangular (c) Circular (d) Spherical |
| 2 | A molecular crystals the band gap is _______
(a) 1 – 3 ev (b) 2.5 – 4 ev (c) 3 – 4 ev (d) 6 – 7 ev |
| 3 | The solid material become semiconducting when charges are either from appropriated electrodes.
(a) Injected (b) Rejected (c) Insulating (d) None of these |
| 4 | OLED can have more than two layers to improve device ______
(a) Weakness (b) Incapacity (c) Efficiency (d) Lack |
| 5 | Fermi level remains _______ throughout a composite material such as P-N diode
(a) Constant (b) Increase (c) Decrease (d) Equal |
| 6 | WOLED device used in order to ________the efficiency
(a) Constant (b) Equal (c) Minimize (d) Maximize |
| 7 | An exciton is bound state of an electron and an electron hole which are attracted to each other by the ______ force.
(a) Electronic (b) Molecular (c) Magnetic (d) Electrostatic coulomb |
| 8 | One of the major issues in ensuring the maximum life is obtained from a LED is keeping the _________
(a) Temperature high (b) Temperature down (c) Temperature constant (d) Temperature very high |
| 9 | The recombination rate is proportional to the _______ to the electron and hole concentration.
(a) Product (b) Sum (c) Devide (d) Negative |
| 10 | A photodiode is a semiconductor device that converts ____
(a) Electrical current into an light (b) Light into an electrical current (c) Temperature into an electrical current (d) Heat into an electrical current |
| 11 | Heterojunction is the interface that between _______
(a) Two layers (b) One layer (c) Three layers (d) Four layers |
| 12 | A nanocrystal is a material particle having at least one dimension ______ 100 nanometres.
(a) Smaller than (b) Greater than (c) Non-equal than (d) Equal than |
| 13 | The optoelectronics is branch of technology concerned with the combined use of _________
(a) Heat and light (b) Magnetic field and light (c) Charge and light (d) Electronics and light |
| 14 | Polymer blends form _______mixtures
(a) Homogenous (b) Multiform (c) Heterogenous (d) hollow |
| Published on 29th Sept 2021 | |
Leave a Reply