Physics Practice MCQ Page 17

Multiple Choice questions for Physics in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 465   The space charge current
  1. depends upon the temperature of the cathode
  2. depends upon the work function of the cathode
  3. is independent of the work function of the material of the cathode
  4. is independent of the geometry of the tube
Question: 466   In a triode-valve, the pale resistance is 1000 ohm and the anode load resistance is 30000 ohm. If the amplification factor is 36, then voltage gain is
  1. 9
  2. 36
  3. 27
  4. 108
Question: 467   In the operation of PNP transistor compared to that of a triode, the N base acts as
  1. emitter
  2. cathode
  3. grid
  4. plate
Question: 468   In an unbiased PN junction, the junction current at equilibrium is
  1. due to diffusion of majority carriers only
  2. due to diffusion of majority carriers only
  3. zero, because equal but opposite carriers are crossing the junction
  4. zero, because no charges are crossing the junction
Question: 469   When the emitter and collector junctions both of a transistors are reverse biased, it is said to be operating in the
  1. active region
  2. cut off region
  3. saturation region
  4. none of these
Question: 470   Ripple factor in the case of a half wave rectifier is equal to
  1. 1.1
  2. 1.21
  3. 0.482
  4. 1.482
Question: 471   A device that counts individual particles but cannot measure their energy is the:
  1. electroscope
  2. ionization chamber
  3. Geiger counter
  4. cloud chamber
Question: 472   A n-p-n transistor may contain one or more of the following elements except:
  1. gallium
  2. arsenic
  3. indium
  4. cesium
Question: 473   In a PN junction, holes diffuse from the p region to the N-region because:
  1. the free electrons in the N-region attract them
  2. they are swept across the function by the potential difference
  3. there is a greater concentration of holes in the AP region as compared to the N-region
  4. none of these
Question: 474   Mutual characteristics curve of a triode is the variation of:
  1. plate current with plate voltage
  2. plate current with grid voltage
  3. plate current with filament voltage
  4. None of these
Question: 475   Class A amplifier has the property that plate current flows.
  1. continuously
  2. intermittently
  3. through its entire cycle of applied signal
  4. through positive half of the applied signal
Question: 476   When A is plotted against B on a graph, the result is a straight line
  1. A and B B are both constant
  2. A cannot be equal to B
  3. A is proportional to B
  4. A is Proportional to B2

Answers to the questions of Physics on this page

Following list gives the correct choice for the answer of the Physics mcqs.
465 . B       466 . C       467 . C       468 . B       469 . B       470 . B       471 . C       472 . D       473 . C       474 . B       475 . C       476 . C      

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