01-10-2012, 03:05 PM
ELECTRONICS MCQs
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Q1. Nucleus of an atom consists of _________________.
1. Electrons and protons
2. Protons and electrons
3. Protons only
4. neutrons only
Q2. An atom without its outermost shell is called________________.
1. atomic core
2. ion
3. anion
4. cation
Q3. In an isolated atom no. of protons are equal to the no. of electrons, this is called the ____.
1. atomic number
2. charge number
3. both 1 and 2
4. atomic mass
Q4. In an atom, protons and neutrons constitute the _________________ of an atom.
1. atomic number
2. atomic mass
3. charge number
4. both 1 and 3
Q5. _________________are a specific group of elements/compounds that exhibit characteristics that lie between those of insulators and conductors.
1. Semiconductors
2. superconductors
3. insulators
4. conductors
Q4. Semiconductor materials typically have ________electrons in the outermost valence ring.
1. four
2. one
3. two
4. no
Q5. ________________ are semiconductors.
1. silicon (Si)
2. germanium (Ge)
3. gallium arsenide (GaAs)
4. all of the above
Q6. ______________ bond exists between the outer shell electrons.
1. covalent
2. ionic
3. atomic bond
4. both 2 and 3
Q7. Atomic number of Si and Ge are ______________ respectively.
1. 14 , 32
2. 32, 14
3. 41, 32
4. 14, 23
Q8. The electrons in the outermost shell of an atom are called _______________ electrons.
1. valence
2. conduction
3. free
4. both 1 and 2
Q9. Valence electrons dictate the nature of the ____________ reactions of the atom and largely determine the ______________nature of solid matter.
1. chemical, electrical
2. electrical , chemical
3. bond of, mechanical
4. chemical, mechanical
Q10. ______________ electrons possess the highest energy.
1. valence shell
2. free
3. innermost shell
4. both 1 and 2
Q11. The range of energy possessed by the electrons of the atoms in a material is called ____.
1. energy band
2. potential energy
3. energy range
4. both 1 and 2
Q12. The difference of energy between two energy bands is called ________.
1. band gap energy.
2. band energy
3. energy range
4. biding energy
Q13. Highest energy band is called ____________.
1. valence band
2. conduction band
3. free band
4. both 2 and 3
Q14. A semiconductor in its pure form is called_____________.
1. extrinsic
2. intrinsic
3. P type
4. N type