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# OAU PHY 203 Class Notes

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This PDF is the class notes for OAU  PHY 203 during the 2022/2023 session.

It encompasses topics ranging from circuit theory and network theorems to Thevenin’s and Norton’s theorems, progressing further into AC circuits, transformers, physics of active devices, semiconductors, and more.

I will continually update this file as we proceed through the classes. Thank you.

# PHY 203 Quiz For OAU

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Created by Oluwaferanmi Akinyele

PHY 203 Quiz

These are likely questions for our test based on our class notes, few questions our lecturers asked in class, examples in the notes and some online questions.

This quiz consists of 95 questions covering all the topics we have been taught in PHY 203 till present. I hope we all find it helpful.

You have 50 mins for this quiz.

Contributors: Zainab, Verah & Lammylex (CHM department)

and Shukroh, Great Blakky and Ebun (PHY department)

Goodluck!❤️

1 / 95

1. Which of the following is/are true

I. Reverse biasing prevents the flow of charge carriers across the junction.

II. Forward biasing is created when the positive terminal is connected to the n-type part of the PN junction.

III. In practice, when we apply reverse biasing to a PN junction, all the charge carriers stops to flow.

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2. Inductors are very common in high-frequency circuit

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3. Calculate the current flowing in the circuit

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4. A capacitor and an Inductor in an AC circuit is referred to as

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5. ________ converts alternating currents into direct currents

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6. A node is a collection point for two or more banches

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7. A hole can also be described as a _________

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8. The loss due to the reversal of magnetization in the transformer core is known as

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9. An ammeter also detects the direction of the flow of current

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10. In an RL circuit voltage across the resistor increases exponentially

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11. What is the number of branches, nodes, loops, and meshes?

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12. An Inductor tend to smooth sudden change in ……………..

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13. A semiconductor in an extremely pure form is known as ………….

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14. In a RC circuit, voltage across the resistor ………………. exponentially with time

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15. Voltmeter draws …………………… current

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16. Circuit elements connected in series have common …………….. passing through each element

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17. Inductors smoothen sharp sudden changes in ……….

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18. when the sensitivity of a meter is high, it means the meter has ………….

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19. Calculate Ia, Ib and Ic

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20. A laminated steel core that has high silicon content provides

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21. The loss due to ohmic resistance of the transformer windings

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22. A multiplier measures ………………, ………………….. and …………………

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23. Which of the following is true about transformers?

I. Open circuit test are done with a load on the transformer.

II. Copper loss is due to the ohmic resistance of the transformer windings.

III. Open circuit test is done to determine the ‘no load loss’ of the transformer.

IV. A transformer is electrically linked.

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24. To convert a multiplier to an ammeter, a ………. resistance is connected in ……………… with a galvanometer

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25. A Thevenin’s equivalent circuit contains an equivalent source Vth in parallel with an equivalent resistor Rth

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26. On the basis of their use, transformers are classified as

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27. AC Current and Voltage may vary with time. True or False?

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28. In a multimeter, when the variable resistance and the fixed resistance are connected in series with the battery and galvanometer, the multimeter functions as

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29. Which of this is true

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30. The majority carriers in an n-type semiconductor is ?

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31. A component that allows the flow of current in only one direction is called ……….

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32. A meter is protected in the case of accidental workload by connecting …………… in ………….. with a voltmeter

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33. Consider the following statements and choose only correct answers

I. The resistivity of a semiconductor is less than that of an insulator and more than a conductor

II. As temperature increases, the conductivity of semiconductors decreases

III. We can consider a semiconductor as a resistance material

IV. Semiconductors have a negative temperature coefficient of resistance

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34. The collector current is determined by the _________

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35. The core in a transformer provides ?

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36. The transistor is a current __________ device.

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37. The voltage signal at the collector is out of phase with the signal at the base by:

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38. A capacitor C and an Inductor L store…………….. and ……………….. respectively

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39. What is known as eddy current loss in a transformer?

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40. If a circuit has the following parameters Vcc =20V, Rs +Rm = 9.3KΩ, Vbe = 0.7, Im =1mA, and Β = 100. Calculate the meter current when E =10V and the voltmeter input r with or without the transistor.

41 / 95

41. The most versatile circuit configuration for transistors is the

42 / 95

42. The arrangement of atoms in a repetitive manner is known as

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43. Why is a laminated steel core used in a transformer instead of a solid core?

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44. A mesh is any closed path in a circuit which does not enclose any other closed path inside it

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45. No electrons can stay in the forbidden gap because

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46. Copper loss is usually larger than other losses

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47. Which of the following is true about the effect of temperature on semiconductors

I. At absolute zero, there are no free electrons.

II. Above absolute zero, bonds break and electrons move under the influence of the applied electric field.

III. The semiconductor has its highest conductivity at absolute zero

IV. The semiconductor behaves as a perfect insulator at absolute zero

48 / 95

48. Which of these will result in forward biasing

I. when certain dc voltage is applied to the junction in such a direction that it cancels the potential barrier thus permitting the flow of current

II. Connecting the negative terminal of the battery to the p-type and positive terminal to the n-type

III. Connecting the positive terminal of the battery to the p-type and negative terminal to the n-type

IV. when certain dc voltage is applied to the junction in such a direction that the potential barrier is increased

49 / 95

49. A emitter-follower circuit has Vcc =12V, Rm = 1KΩ and a 2mA meter. If the amplification factor of the resistor is 80 and Vbe = 0.7. Calculate the suitable r for Rs to give fsd when E= 5V.

50 / 95

50. A resistor is regarded as a circuit element which puts energy into a circuit

51 / 95

51. The separation between conduction band and valence band on the energy level diagram is called ________

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52. Which of this must be connected to multimeter to be able to measure AC voltages?

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53. The potential barrier of a P-N junction depends on which of the following except

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54. A capacitor stores charge and hence, electric energy

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55. A 6600/550V, 25KVA transformer has iron losses of 350W and its 1º and 2° winding resistances are 14.5 and 0.1Ω respectively. Determine the full load efficiency at a power factor of unity.

56 / 95

56. The resistivity of a semiconductor is ………. that of an insulator, and …………that of conductors

57 / 95

57. What are the examples of passive elements?

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58. Select the correct options only

I. Pentavalent impurities provide large number of free electrons to the semiconductor.

II. Trivalent impurities provide large number of free electrons to the semiconductor.

III. Trivalent impurities provide large number of holes to the semiconductor.

IV. Pentavalent impurities provide large number of holes to the semiconductor.

59 / 95

59. A perfect amplifier has all of the following properties except:

60 / 95

60.

How many branches, nodes, loop and mesh do we have here?

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62 / 95

62. A galvanometer measures and detects extremely small currents both in ………………… and ………………………

63 / 95

63. In a semiconductor, as temperature increases, conductivity ………………

64 / 95

64. The transistor is a three-terminal device that we can use to form a _____________ circuit

65 / 95

65. Calculate Rth, Vth, and I5

66 / 95

66. Coils are …………… separated, but ……………. linked together

67 / 95

67. Which of the following is/are correct?

I. Bipolar junction transistors control the current by varying the number of charge carriers

II. Voltage between 2 terminals are indicated by repeated letters

III. The emitter is lightly doped to reduce junction capacitance

IV. The emitter-base junction is forward biased

68 / 95

68. Circuit elements are connected in parallel when a common ……………. is applied to each elements

69 / 95

69. Which of the following transformers has a high rating?

70 / 95

70. A transformer only increases the voltage with corresponding increase in current

71 / 95

71. The emf that gets induced in the secondary winding according to Faraday’s law of electromagnetic induction is called?

72 / 95

72. When a small amount of trivalent impurity is added to a pure semi conductor, the semi conductor becomes

73 / 95

73. Calculate the equivalent resistance

74 / 95

74. …………………. are responsible for the conduction  in a conductor

75 / 95

75. Which of the statements about PN junction is true

I. A PN junction presents a high resistance if forward biased.

II. A PN junction presents a high resistance if reversed biased.

III A PN junction presents a low resistance if forward biased.

IV. A PN junction presents a low resistance if reversed biased.

76 / 95

76. The e–h+ pair can also be called ____

77 / 95

77. p-type and n-type semiconductor join together to form a …………….. known as …………….

78 / 95

78. In checking for continuity of circuit which on these is used

79 / 95

79. Any transistor designed must operate in the ________ region of the characteristic curve

80 / 95

80. In a transformer, most flux which get linked to the secondary winding is called?

81 / 95

81. A material that releases an electron from the valence band into the conduction band when a photon of light is incident on it is a ___________

82 / 95

82. The principle behind the working of a transformer is _________

83 / 95

83. The process of setting up a current to operate a transistor at a desired point on its characteristic curve is known as __________

84 / 95

84. Which of the following is correct

I. Small changes in V(BE) will produce large current changes in I(C) & I(E)

II. Small changes in V(CE) have little effect on I(B)

III. Small changes in V(CE) will produce large current changes in I(C) & I(E)

I, II, III & IVIV. Small changes in V(BE) will produce large current changes in I(B)

85 / 95

85. In electronics, _____ refers to the use of DC voltage to establish certain operating conditions for an electronic device.

86 / 95

86. Depletion layer serves as barrier to the movement of free electrons.

87 / 95

87. Which of the following statements is/are true? I. A multimeter can be used as an ammeter when low resistance is connected in parallel with the galvanometer II. A low sensitive meter will measure Voltage perfectly III. A multimeter cannot be used to determine circuit continuity IV. A multimeter can be used as an voltmeter when high resistance is connected in series with the galvanometer

88 / 95

88. A transformer consists of two inductive coils namely;

89 / 95

89. Extrinsic semiconductors have more current conducting capacity than intrinsic semiconductors

90 / 95

90. The Norton’s equivalent circuit contains a Norton equivalent source “I(N)” in parallel with an equivalent resistor R(N)

91 / 95

91. In pure inductors, current ……… the voltage by ……

92 / 95

92. A inductor stores energy in its _________

93 / 95

93. A p-n junction is also known as

94 / 95

94. What type of bonds exist in semiconductors

95 / 95

95. A variable resistor in an electric circuit is for ……………

The average score is 53%

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# Quiz for CSC 201

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You have 30 mins for this quiz

Time up!

Created by Oluwaferanmi Akinyele

CSC 201

Preparatory Quiz for CSC 201 Test 2022/2023. This quiz contains 40 multiple choice questions.

The questions are compiled by Physics department gurus;

Ebun (Class rep)

Levi

Oluwaferanmi

Great

and Blakky

1 / 40

What is the value of the following expression?

“`float(22//3+3/3)“`

2 / 40

Application software includes the following except

3 / 40

What are the two main types of functions in Python?

4 / 40

Which of the following variable naming is correct

5 / 40

What is the average value of the following Python code snippet?

6 / 40

The ______ is the brain of the computer that performs simple arithmetic & logical operations

7 / 40

What will be the output of the following Python expression?

“`round(4.576)“`

8 / 40

The outcome of a programming activity is a _________

9 / 40

The following are python reserved words excerpt

10 / 40

Is Python case sensitive when dealing with identifiers?

11 / 40

Which of the following is an invalid statement?

12 / 40

Is Python code compiled or interpreted?

13 / 40

‘Bit’ stands for

14 / 40

The following are program elements except

15 / 40

What are the values of the following Python expressions?

“` 2**(3**2)“`

“` (2**3)**2“`

“` 2**3**2“`

16 / 40

A computer software comprises of ___________ software & ___________ software

17 / 40

The correct sequence of the history of modern era is

18 / 40

What will be the value of X in the following Python expression?

“`X = 2+9*((3*12)-8)/10“`

19 / 40

What is the maximum possible length of an identifier in Python?

20 / 40

Python was created in what year

21 / 40

Which of the following character is used to give single-line comments in Python?

22 / 40

Which keyword is used to call a function in Python language?

23 / 40

Which of the following is the correct extension of the Python file?

24 / 40

A ________ is a sequence of instructions telling the computer what to do.

25 / 40

Which of the following is an invalid variable?

26 / 40

The following is true about python except

27 / 40

Which among the following list of operators has the highest precedence?

“` +, -, **, %, /, <<, >>, |“`

28 / 40

Which of the following is used to define a block of code in Python language?

29 / 40

Machines developed in transistor era include the following except

30 / 40

The expression

“`2**2**3“` is equal to “`(2**2)**3“`

31 / 40

Which of the following functions is a built-in function in python?

32 / 40

Operating Systems includes the following except

33 / 40

Machines developed in mechanical era include the following except

34 / 40

Which one of the following is the use of function in python?

35 / 40

Which type of Programming does Python support?

36 / 40

In flow charts, a terminal is represented with what shape

37 / 40

Which of the following is true for variable names in Python?

38 / 40

What is the order of precedence in python?

39 / 40

Who developed Python Programming Language?

40 / 40

The following are high-level languages except

The average score is 66%

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# PHY 205 Quiz

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OAU PHY 205 Quiz

PHY 205

1 / 34

1. What type of process is represented by this equation e† + e¯ → ϒ + ϒ

2 / 34

2. What is the electric charge of a positron?

3 / 34

3. What is the relative mass of an electron compared to a proton?

4 / 34

4. Wavelength is inversely proportional to an object’s mass

5 / 34

5. Electrons absorbs energy in form of photons as they are accelerated

6 / 34

6. Which of the following statements about electrons within an atom is true?

7 / 34

7. Which of the following is not quantized?

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8. What is the intrinsic angular momentum (spin) value of an electron?

9 / 34

9. Electrons, being fermions, adhere to which principle that prohibits two electrons from occupying the same quantum state?

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10. Which field properties does an electron exhibit due to its charge and motion?

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11. Which branch of physics is concerned with the quantization of energy and its effects on the interaction of matter and energy?

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12. Which of the following statements is TRUE?

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13. What term is used to describe the lowest energy state that an electron can occupy within an atom?

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1. Why is it necessary for the tube to be in a vacuum during thermionic emission?

15 / 34

2. In what devices are cathode ray tubes commonly used?

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3. High beam of cathode ray in vacuum tube can be steered and manipulated by

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4. What type of radiation can be produced using cathode ray tubes?

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5. In Thompson’s experiment, a a beam of electron travelling at 6.8 x 10^7m/s is bent into a circular path of radius 4cm in the magnetic of induction 10^-2 W/m2. Find the specific charge to mass (e/m)

19 / 34

6. What is thermionic emission?

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7. What happens when a metal wire is heated in a vacuum during thermionic emission?

21 / 34

1. How do the oscillations of the electrical and magnetic components in electromagnetic waves relate to the direction of propagation?

22 / 34

2. In Rutherford's model, where is the positive charge concentrated?

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3. What is the primary reason for the scattering of alpha particles in Rutherford's model?

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4. In Thomson's model, where are the negatively charged electrons located?

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5. In quantum mechanics, what role does a photon play in the electromagnetic field?

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6. How are the electrons distributed in Thomson's model?

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7. What is a photon?

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8. What is the significance of alpha particle scattering experiments in Rutherford's model?

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9. Arrange the following types of electromagnetic radiation in order of increasing frequency:

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10. If the dimensions of the nucleus are small enough, what can happen to alpha particles passing very near the nucleus in Rutherford's model?

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11. What are electromagnetic waves?

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12. Arrange the following types of electromagnetic radiation in order of increasing wavelength

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13. In electromagnetic waves, how do the electrical and magnetic components oscillate?

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14. According to quantum mechanics, what is the alternate view of electromagnetic radiation (EMR)?

The average score is 66%

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# OAU BIO 101 Class Notes

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This PDF is the class notes for OAU  BIO 101  during the 2022/2023 session.

It encompasses topics ranging from Nucleic acids to nucleosides and nucleotides, to summaries of protein in class to lipids, up to zoology.

I will continually update this file as we proceed through the classes. Thank you.

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