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Biophysics MCQs Part 3 PMU

Description

Just made up questions. Based on essays
Med Student
Quiz by Med Student , updated more than 1 year ago
Med Student
Created by Med Student almost 8 years ago
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Resource summary

Question 1

Question
Materials which have no free charges are called
Answer
  • Dielectrics
  • Transistors
  • Polarisers

Question 2

Question
When a dielectric is placed in an electric field, there is a displacement of the electron cloud relative to the nucleus(the inner circle). This refers to
Answer
  • Electric polarisation
  • Ionic polarisation
  • Dipolar polarisation
  • Macrostructural polarisation

Question 3

Question
Ionic polarisation
Answer
  • results from separation of +ve and –ve ions which are held together by ionic bonds
  • results when free polar molecules are subjected to an electrical field, they orientate themselves along the field
  • results when electrical field is applied to a large structure i.e.a cell, the free ions etc

Question 4

Question
When free polar molecules are subjected to an electrical field, they orientate themselves along the field this is known as
Answer
  • Ionic polarisation
  • Dipolar polarisation
  • Hyperpolarisation
  • Electric polarisation

Question 5

Question
Macro structural polarisation
Answer
  • electrical field is applied to a large structure i.e.a cell, the free ions etc
  • on surfaces with double electrical layer when an external electrical field causes absorptionand diffusion on opposite sides of the ions in the external medium
  • when a dielectric is placed in an electric field, there is a displacement of the electron cloud relative to the nucleus(the inner circle).

Question 6

Question
Relaxation time is (10^-16)-(10^-14) for
Answer
  • Electric polarisation
  • Dipolar Polarisation
  • Superficial polarisation

Question 7

Question
Relaxation time is (10^-3)-(1 sec) for
Answer
  • Superficial potential
  • Electric Potential
  • Ionic Potential

Question 8

Question
The measure of the opposition that a circuit presents to a current when a voltage is applied
Answer
  • Electric Impedence
  • Electric Resistance
  • Ohms Resistances
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