ECAT Pre Computer Science Chapter 17 online mcq test with answers for Physics chapter 17 (Physics of Solids)

ECAT Physics Chapter 17 Physics of Solids Online Test

Sr. #	Questions	Answers Choice
1	In the doping process, the ratio of the doping atoms to the semi conductor atom is	1 to 10 1 to 10<sup>3</sup> 1 to 10<sup>6</sup> 1 to 10<sup>9</sup>
2	When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as	impurification adding doping extrinsivity
3	A semi-conductor in its extremely pure form is known as	extrinsic semi-conductor intrinsic semi-conductor either of them none of them
4	The materials in which there are plenty of free electrons for electrical conduction are known as	conductors insulators semi-conductors all of them
5	The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as	conductors insulators semi-conductors all of them
6	The bands below the valence band are	completely filled and play active part in conduction process completely filled and plays no part in conduction process completely filled and play active part in conduction process not completely filled and play no part in conduction process
7	The conduction band in a solid	may be empty cannot be empty should be filed all of them
8	The electrons occupying the conduction band are known as	conduction electrons free electrons both of them none of them
9	The band above the valence band is called	high energy band conduction band empty band none of them
10	The valence band of an atom in a solid	is always empty may or may not be empty can never be empty none of them
11	The electrons in the outermost shell of an atom are called	core electrons valence electrons high energy electrons none of them
12	When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called	energy bands energy shells states all of them
13	Electrons of an isolated atom are bound to the nucleus, and	can only have distinct energy level can only have same energy level may or may not have distinct energy levels none of these
14	Which of the following theory completely explain the three types of materials	Bohr model of electron distribution Rutherford atomic model Pauli's exclusion principle energy band theory
15	Lead, copper and wrought iron are examples of	brittle substances ductile substances plastic substances elastic substances

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