Academictask provides MCQs of Physics from Basic to Advance, so that you can prepare accordingly. Physics Mcqs section is useful for both students and job seekers i.e MCAT ECAT ETEA test preparation, PPSC Test, FPSC Test
261. The operation of a transistor requires______________?
A. That the emitter be heated
B. That the base be heated
C. That the collector be heated
D. None of the above
262. Non-inverting amplifier circuits have____________?
A. A very high input impedance
B. A very low input impedance
C. A low output impedance
D. None of the above
263. An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a ______________?
A. Non-inverting voltage at output
B. Reference voltage on the other
C. Virtual input
D. Output
264. The working of transistor as amplifier is similar to________________?
A. Step up transformer
B. Step down transformer
C. Three diodes in common
D. Triode vacuum tube
265. To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?
A. 2
B. 3
C. 4
D. 5
266. In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?
A. Equal to D.C. value
B. More than D.C. value
C. Less than D.C. value
D. Zero
267. In forward bias the width of potential barrier_____________?
A. Increases
B. Decreases
C. Remains same
D. No effect
268. The electronic circuits which implement the various logic operations are called_____________?
A. Logic gates
B. Boolean algebra
C. Amplifier gain
D. Logic functions
269. Acceptor and donor impurities donate______________?
A. n-carriers only
B. p-carriers only
C. p-carriers and n-carriers respectively
D. n-carriers and p-carriers respectively
270. An OP-AMPs can amplify_______________?
A. D.C.
B. A.C.
C. Both A.C. & D.C.
D. None of the above