a) Semiconductors b) Conductors c) Insulators d) Alloys Ans: (c)
a) Negative only b) Positive only c) Either positive or negative d) Not applicable Ans: (b)
a) Insulator b) N-type semiconductor c) Conductor d) P-type semiconductor Ans: (a)
a) 0.1 b) 0.5 c) 1.0 d) 0.33 Ans: (b)
a) 1/5 EF b) 2/5 EF c) 3/5 EF d) 4/5 EF Ans: (c)
a) 1 × 10-4 micron b) 1 × 10-6 micron c) 1 micron d) 1 × 10-6 cm Ans: (c)
a) Ohmic b) Non-rectifying c) Either (a) or (b) d) None of the above Ans: (c)
a) Common emitter b) Common collector c) Common case d) None of the above Ans: (a)
a) N-p-n transistors have low heat dissipation b) N-p-n transistors are cheap and easily available c) N-p-n transistors have high mobility of holes d) N-p-n transistors have higher mobility of electrons than holes in p-n-p transistors Ans: (d)
a) Two b) Three c) Four d) Six Ans: (c)
a) In the protons b) In the electrons c) In the neutrons d) In the atomic nucleus which contains protons and neutrons Ans: (d)
a) Only two atoms b) Only one atom c) Only four atoms d) Any number of atoms Ans: (d)
a) The number of electrons is equal protons b) The number of electrons isles than protons c) The number of electrons is more than protons d) The number of protons is equal to neutrons Ans: (a)
a) In the shells closer to the atomic nucleus b) In the outer shall c) In any position of the shells d) None of them Ans: (a)
a) Remain neutral b) Become electrically charged c) Become negatively charged d) Become positively changed Ans: (a)