Physics Practice MCQ Page 31

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: 3547   There is a constant ratio between the kinetic energy and total energy of an electron in an atom of hydrogen according to Bohr's model. This ratio is
  1. 1:-1
  2. 1:1
  3. 1:2
  4. 2:1
Question: 3549   Which of the following can be used as an arrester in a nuclear reactor?
  1. Graphite
  2. Heavy water
  3. uranium
  4. cadmium
Question: 3552   If a moving electron is deflected side ways in passing through a certain region of space can we be sure that a magnetic field exists in that space?
  1. yes
  2. no
  3. do not know
Question: 3554   What for the diodes used in power supply circuits
  1. rectifier
  2. signal detector
  3. wave shapers
  4. amplifier
Question: 3555   Reciprocal of impedacne is called
  1. inductance
  2. capacitance
  3. admittance
  4. none of these
Question: 3558   When we apply reverse bias to a juncton diode, it
  1. lowers the potential barrier
  2. raises the potential barrier
  3. greatly increases the minority carrier current
  4. greatly increases the majority carrier current
Question: 3559   Who discovered the thermionic emission
  1. fleming
  2. lee de forest
  3. garnows
  4. rutherford
Question: 3561   In a PN junction diode, 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 junction by the potential difference
  3. there is greater concentration of holes in the P-region as compared to N-region
  4. none of these
Question: 3562   In a semiconductor diode, the barrier potential offers opposition to only
  1. majority carriers in both regions
  2. minority carriers in both regions
  3. free electrons in the N-region
  4. holes in the P-region
Question: 3563   If both the collector and emitter junctions of a transistor are forward biased, the transistor is said to operate in the
  1. active region
  2. saturation region
  3. cut-off region
  4. none of above
Question: 3564   If three amplifier stages each with a gain of 30 are cascaded, what is the over all gain
  1. 30
  2. 90
  3. 270
  4. 27000
Question: 3566   An oscillator is a=basically an amplifier with loop gain
  1. less than unity
  2. more than unity
  3. zero
  4. none of the above

Answers to the questions of Physics on this page

Following list gives the correct choice for the answer of the Physics mcqs.
3547 . A       3549 . D       3552 . B       3554 . A       3555 . C       3558 . B       3559 . A       3561 . A       3562 . A       3563 . A       3564 . D       3566 . B      

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