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Class 10 Physics Chapter 7


Updated: 21 Dec 2023

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Class 10 Physics Chapter 7 introduces the concept of “Introductory Electronics”. This is mainly chapter No. 16, “Introductory Electronics”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of Physics, which cover your course, board papers and clear your Physics concept for different types of tests.

Class 10 Physics Chapter 7 Notes

Introductory Electronics

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Class 10 Physics Chapter No. 16 Notes

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SLO Base Notes

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Class 10 Physics Chapter 16 SLO Base Notes

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Class 10 Physics Chapter 7 MCQs

1. What is the branch of physics and technology concerned with the design of circuits using transistors and microchips?
(a) Optics
(b) Electronics
(c) Mechanics
(d) Astronomy
Show Answer

Electronics


2. In which of the following is electronics widely used?
(a) Agriculture
(b) Construction
(c) Information processing, telecommunication, and signal processing
(d) Fashion design
Show Answer

Information processing, telecommunication, and signal processing


3. What property of metals allows them to conduct electricity?
(a) Color
(b) Presence of free electrons
(c) Weight
(d) Shape
Show Answer

Presence of free electrons


4. Which type of electrons in metals is referred to as ‘free electrons’?
(a) Core electrons
(b) Proton electrons
(c) Valence electrons
(d) Neutron electrons
Show Answer

Valence electrons


5. What is the term used for the minimum energy required for an electron to escape from a metal?
(a) Escape energy
(b) Work function
(c) Kinetic energy
(d) Valence energy
Show Answer

Work function

To Download Complete Notes of Physics Notes 10 Class, Click on the given link.

6. What part of the metal’s electrons is tightly bound to individual atoms?
(a) Valence electrons
(b) Proton electrons
(c) Core electrons
(d) Neutron electrons
Show Answer

Core electrons


7.. Why are valence electrons in metals termed as ‘free electrons’?
(a) They are not bound to any atom
(b) They have a specific color
(c) They are the heaviest
(d) They are highly reactive
Show Answer

They are not bound to any atom


8. What is the term for the process where increasing the temperature of a metal results in electrons escaping from it?
(a) Thermodynamic cooling
(b) Thermionic emission
(c) Thermal expansion
(d) Temperature conduction
Show Answer

Thermionic emission


9. What does the term “thermionic emission” refer to?
(a) Electron escape caused by magnetic fields
(b) Electron escape induced by light
(c) Electron escapes due to temperature increase
(d) None of these
Show Answer

Electron escapes due to temperature increase


10. What factor does thermionic emission depend on?
(a) Magnetic fields
(b) Temperature
(c) Color of the metal
(d) Electrical resistance
Show Answer

Temperature


11. How is thermionic emission achieved in a vacuum?
(a) By cooling the metal
(b) By exposing the metal to sunlight
(c) By passing an electric current through a tungsten filament
(d) By applying pressure to the metal
Show Answer

By passing an electric current through a tungsten filament


12. What is the primary function of an electron gun?
(a) Emitting light
(b) Producing a focused and accelerated electron beam
(c) Generating sound waves
(d)
Show Answer

Producing a focused and accelerated electron beam


13. In which devices is an electron gun commonly used?
(a) Coffee makers
(b) Refrigerators
(c) Televisions, 3D printers, Scanning Electron Microscopes (SEM), and large synchrotrons
(d) Washing machines
Show Answer

Televisions, 3D printers, Scanning Electron Microscopes (SEM), and large synchrotrons


14. What is the composition of the electron gun?
(a) Copper tube
(b) Glass tube at very low pressure with a negatively charged electrode (cathode) and a positively charged electrode (anode)
(c) Plastic casing
(d) Aluminum frame
Show Answer

Glass tube at very low pressure with a negatively charged electrode (cathode) and a positively charged electrode (anode)


15. What materials are applied to the cathode to enhance the emission of electrons at a moderate temperature?
(a) Gold and silver
(b) Iron and steel
(c) Barium and strontium oxide
(d) Aluminum and copper
Show Answer

Barium and strontium oxide


16. What is the purpose of the control grid in the electron gun?
(a) Producing heat
(b) Controlling the flow of electrons
(c) Amplifying sound waves
(d) Emitting light
Show Answer

Controlling the flow of electrons


17. What is the approximate current and voltage required by the indirectly heated cathode in the electron gun?
(a) 100 mA and 10V
(b) 300 mA and 3.5V
(c) 600 mA and 6.3V
(d) 800 mA and 8V
Show Answer

600 mA and 6.3V


18. In an electron gun, what is the function of the anode?
(a) Emitting electrons
(b) Controlling the flow of electrons
(c) Producing a magnetic field
(d) Providing a positive charge
Show Answer

Providing a positive charge


19. Which material is commonly used to make the control grid in the electron gun?
(a) Aluminum
(b) Nickel
(c) Copper
(d) Gold
Show Answer

Nickel


20. What is the role of the accelerating anode in the electron gun?
(a) Decreasing electron velocity
(b) Controlling the intensity of the beam
(c) Applying a negative bias to the electrons
(d) Accelerating electrons with high positive potential
Show Answer

Accelerating electrons with high positive potential


21. How is the electron beam focused in the electron gun?
(a) By changing the color of the electrons
(b) By adjusting the size of the control grid
(c) By the focusing anode
(d) By the deflection system
Show Answer

By the focusing anode


22. What is the final destination of the electron beam after passing through the focusing anode?
(a) The control grid
(b) The cathode
(c) The deflection system
(d) The fluorescent screen
Show Answer

The fluorescent screen


23. What is the term used for the electron beam produced by an electron gun?
(a) Anode rays
(b) Cathode rays
(c) Proton rays
(d) Neutron rays
Show Answer

Cathode rays


24. Why are cathode rays attracted to the positive electrode in an electric field?
(a) Due to their positive charge
(b) Due to their negative charge
(c) Due to their neutral charge
(d) Due to their mass
Show Answer

Due to their negative charge


25. What is the effect of a magnetic field on ‘cathode rays’ composed of electrons?
(a) Attraction
(b) Repulsion
(c) No effect
(d) Deflection
Show Answer

Deflection


26. Which rule can be used to determine the direction of force and deflection of the electron beam in a magnetic field?
(a) Newton’s First Law
(b) Right Hand Rule ll
(c) Fleming’s Right Hand Rule
(d) Archimedes’ Principle
Show Answer

Fleming’s Right Hand Rule


27. Why does a magnetic field exert forces on electrically charged particles in motion, such as electrons in cathode rays?
(a) Due to their mass
(b) Due to their neutral charge
(c) Due to their negative charge
(d) Due to their positive charge
Show Answer

Due to their negative charge


28. What forces are exerted on cathode rays in a magnetic field when the direction of motion is not aligned with the magnetic field?
(a) Forces of attraction
(b) Forces of repulsion
(c) No forces acting on cathode rays
(d) Magnetic forces causing deflection
Show Answer

Magnetic forces causing deflection


29. What forces are exerted on cathode rays in a magnetic field when the direction of motion is aligned with the magnetic field?
(a) Forces of attraction
(b) Forces of repulsion
(c) Magnetic forces causing deflection
(d) No forces acting on cathode rays
Show Answer

No forces acting on cathode rays


30. What does C.R.O. stand for?
(a) Cathode Ray Oscilloscope
(b) Central Radiographic Operations
(c) Cathode Ray Oscillator
(d) Computerized Radiological Output
Show Answer

Cathode Ray Oscilloscope


31. In which devices is the Cathode Ray Tube (CRT) commonly used?
(a) Refrigerators
(b) Washing machines
(c) Computer monitors, TV sets, and oscilloscope tubes
(d) Microwave ovens
Show Answer

Computer monitors, TV sets, and oscilloscope tubes


32. What is the main function of the Cathode Ray Tube (CRT) in a C.R.O.?
(a) Generating radio waves
(b) Emitting light for display
(c) Cooling electronic components
(d) Generating a beam of electrons
Show Answer

Generating a beam of electrons


33. What is the purpose of the highly evacuated glass tube in the C.R.O.?
(a) To contain water
(b) To facilitate the movement of electrons
(c) To provide external connections
(d) To generate sound waves
Show Answer

To facilitate the movement of electrons


34. What part of the C.R.O. generates the electron beam?
(a) Fluorescent material
(b) Cathode
(c) Anode
(d) Deflection plates
Show Answer

Cathode


35. How does the C.R.O. produce visible light in its operation?
(a) By heating the electron gun
(b) By using magnetic fields
(c) By firing an electron beam at a fluorescent material
(d) By applying high pressure in the glass tube
Show Answer

By firing an electron beam at a fluorescent material


36. How does the electron beam cover the entire screen in a C.R.O.?
(a) By changing its color
(b) By sweeping in a circular motion
(c) By increasing its velocity
(d) By changing its vertical and horizontal directions
Show Answer

By changing its vertical and horizontal directions


37. What happens when an electron in the beam strikes a phosphor in the C.R.O.?
(a) It generates more electrons
(b) It excites an electron in the phosphor, causing visible light emission
(c) It absorbs all the energy
(d) It changes direction randomly
Show Answer

It excites an electron in the phosphor, causing visible light emission


38. How is a color image formed on the screen of a C.R.O.?
(a) By changing the frequency of the electron beam
(b) By adjusting the temperature of the electron gun
(c) By using different types of phosphors emitting red, blue, and green light
(d) By varying the intensity of the electric signal
Show Answer

By using different types of phosphors emitting red, blue, and green light


39. What is the primary purpose of a Cathode Ray Oscilloscope (C.R.O.) in electronics?
(a) To generate electric signals
(b) To observe the waveform of repetitive electric signals
(c) To change the color of light
(d) To measure magnetic fields
Show Answer

To observe the waveform of repetitive electric signals


40. How can a C.R.O. function as a voltmeter?
(a) By changing its color
(b) By emitting light
(c) By measuring potential difference
(d) By generating electrons
Show Answer

By measuring potential difference


41. Why is an oscilloscope commonly used for troubleshooting malfunctioned electronic equipment?
(a) It is lightweight
(b) It is colorful
(c) It plays music
(d) It can graphically show signals
Show Answer

It can graphically show signals


42. For checking newly designed circuitry, what kind of issues can an oscilloscope help identify?
(a) Cooking preferences
(b) Mechanical failures
(c) Design errors, voltage levels, and electrical noise
(d) Gardening problems
Show Answer

Design errors, voltage levels, and electrical noise


43. The branch of electronics that deals with analogue quantities is called:
(a) Analogue Electronics
(b) Digital Electronics
(c) Binary Electronics
(d) Voltage Electronics
Show Answer

Analogue Electronics


44. What does an analogue quantity represent in electronics?
(a) Discrete values
(b) Continuous values
(c) Binary digits
(d) Alphabetical symbols
Show Answer

Continuous values


45. The branch of electronics that deals with digital quantities is called:
(a) Digital Electronics
(b) Analogue Engineering
(c) Continuous Circuitry
(d) Voltage Variation Science
Show Answer

Digital Electronics


46. What does a digital quantity represent in electronics?
(a) Discrete values
(b) Continuous values
(c) Numerical values
(d) Alphabetical symbols
Show Answer

Discrete values


47. Which circuit is responsible for converting analogue signals to digital format?
(a) Digital to Analogue Converter (DAC)
(b) Binary Encoder
(c) Analogue to Digital Converter (ADC)
(d) Voltage Regulator
Show Answer

Analogue to Digital Converter (ADC)


48. Which circuit is responsible for converting digital signals to analogue signals?
(a) Digital to Analogue Converter (DAC)
(b) Binary Encoder
(c) Analogue to Digital Converter (ADC)
(d) Voltage Regulator
Show Answer

Digital to Analogue Converter (DAC)


49. What is the primary advantage of converting analogue information to digital format for electronic machines?
(a) Increased complexity
(b) Handling infinite possibilities
(c) Easier interpretation and processing
(d) Analogous representation
Show Answer

Easier interpretation and processing


50. What is the primary function of a logic gate in digital electronic circuitry?
(a) Voltage regulation
(b) Analog signal processing
(c) Perform logical operations
(d) Continuous current flow
Show Answer

Perform logical operations


51. How many output terminals does a logic gate typically have?
(a) Two
(b) One
(c) Three
(d) Variable
Show Answer

One


52. What are the possible output states of a logic gate?
(a) HIGH (1) and MEDIUM (2)
(b) ON and OFF
(c) LOW (0) and HIGH (1)
(d) Analog and Digital
Show Answer

LOW (0) and HIGH (1)


53. What is used to depict algebraically the operation of a logic gate or combination of gates?
(a) Boolean equation
(b) Linear equation
(c) Trigonometric equation
(d) Differential equation
Show Answer

Boolean equation


54. What is a truth table used for in term of logic circuits?
(a) Calculating resistance
(b) Depicting input voltages
(c) Representing circuit symbols
(d) Showing all possible inputs and corresponding outputs
Show Answer

Showing all possible inputs and corresponding outputs


55. Which of the following is not a basic logic gate?
(a) AND gate
(b) OR gate
(c) NOT gate
(d) Voltage gate
Show Answer

Voltage gate


56. What is the output of a simplified AND gate with two inputs when both inputs are high (1)?
(a) Low (0)
(b) Medium (0.5)
(c) High (1)
(d) Variable
Show Answer

High (1)


57. How is the Boolean equation for the AND function represented?
(a) X = A + B
(b) X = AB
(c) X = \frac{A}{B}
(d) X = A - B
Show Answer

X = AB


58. What is the primary function of an AND gate in terms of input conditions?
(a) Output is high if any input is high
(b) Output is high if one input is high
(c) Output is high only if both inputs are high
(d) Output is high regardless of input conditions
Show Answer

Output is high only if both inputs are high


59. In the truth table, what is the output (X) when both inputs (A and B) are low (0)?
(a) 0
(b) 1
(c) Not defined
(d) Variable
Show Answer

0


60. What is the circuit symbol for the AND gate described?
(a) Circle
(b) Triangle
(c) Square
(d) None of these
Show Answer

None of these


61. How is the logical multiplication of inputs represented in the AND gate?
(a) Addition
(b) Subtraction
(c) Multiplication
(d) Division
Show Answer

Multiplication


62. What does the AND gate’s truth table show for the combination A = 1 \ and \ B = 0 ?
(a) 0
(b) 1
(c) Undefined
(d) Variable
Show Answer

0


63. What is the output of a simplified OR gate with two inputs when both inputs are high (1)?
(a) Low (0)
(b) Medium (0.5)
(c) High (1)
(d) Variable
Show Answer

High (1)


64. How is the Boolean equation for the OR function represented?
(a) X = A + B
(b) X = AB
(c) X = \frac{A}{B}
(d) X = A - B
Show Answer

X = A + B


65. What is the primary function of an OR gate in terms of input conditions?
(a) Output is high if any input is high
(b) Output is high only if both inputs are high
(c) Output is high if no input is high
(d) Output is high regardless of input conditions
Show Answer

Output is high if any input is high


66. In the truth table, what is the output (X) when both inputs (A and B) are low (0)?
(a) 0
(b) 1
(c) Not defined
(d) Variable
Show Answer

0


67. How is the logical addition of inputs represented in the OR gate?
(a) Addition
(b) Subtraction
(c) Multiplication
(d) Division
Show Answer

Addition


68. What does the OR gate’s truth table show for the combination A = 1 \ and \ B = 0 ?
(a) 0
(b) 1
(c) Undefined
(d) Variable
Show Answer

1


69. What is the primary function of a NOT gate in digital electronic circuitry?
(a) Logical addition
(b) Complement or inversion
(c) Multiplication
(d) Continuous signal processing
Show Answer

Complement or inversion


70. How many inputs does a NOT gate typically have?
(a) One
(b) Two
(c) Three
(d) Variable
Show Answer

One


71. What is the output of a NOT gate when a High level (1) is input?
(a) Low-level (0)
(b) Medium (0.5)
(c) High-level (1)
(d) Variable
Show Answer

Low-level (0)


72. What Boolean equation represents the function of a NOT gate?
(a) X = A + B
(b) X = AB
(c) X = \overline{A}
(d) X = A - B
Show Answer

X = \overline{A}


73. What is the circuit symbol for a NOT gate.
(a) Circle
(b) Triangle
(c) Bulb
(d) Square
Show Answer

Triangle


74. In the truth table, what is the output (X) when the input (A) is Low level (0)?
(a) 0
(b) 1
(c) Undefined
(d) Variable
Show Answer

1


75. What is the common name for a NOT gate due to its function of complementing a signal?
(a) AND gate
(b) OR gate
(c) Inverter
(d) NOR gate
Show Answer

Inverter


76. How does a NOT gate contribute to the inversion of a digital signal?
(a) By adding a constant value
(b) By multiplying the input
(c) By complementing the input
(d) By filtering the input signal
Show Answer

By complementing the input


77. How does the operation of a NAND gate differ from an AND gate?
(a) NAND gate has more inputs
(b) NAND gate has an inverted output
(c) AND gate has an inverted output
(d) AND gate performs logical addition
Show Answer

NAND gate has an inverted output


78. What is the symbol for a NAND gate derived from?
(a) OR gate with an inversion circle
(b) AND gate with an inversion circle
(c) OR gate with a square
(d) NOT gate with a triangle
Show Answer

AND gate with an inversion circle


79. What is the Boolean equation for a NAND gate?
(a) X = A + B
(b) X = AB
(c) X = A \div B
(d) X = \overline{AB}
Show Answer

X = \overline{AB}


80. What is the truth table output of a NAND gate when both inputs (A and B) are high (1)?
(a) 0
(b) 1
(c) Undefined
(d) Variable
Show Answer

0


81. What happens to the output of a NAND gate when either input (A or B) is low (0)?
(a) It remains low
(b) It becomes high
(c) It becomes undefined
(d) It varies based on other factors
Show Answer

It becomes high


82. What does the inversion bar over (A and B) in the Boolean equation signify?
(a) Logical multiplication
(b) Logical addition
(c) Complement of (A and B)
(d) Logical subtraction
Show Answer

Complement of (A and B)


83. How does the operation of a NOR gate differ from an OR gate?
(a) NOR gate has more inputs
(b) NOR gate has an inverted output
(c) OR gate has an inverted output
(d) OR gate performs logical addition
Show Answer

NOR gate has an inverted output


84. What is the symbol for a NOR gate derived from?
(a) AND gate with an inversion circle
(b) OR gate with a square
(c) OR gate with an inversion circle
(d) NOT gate with a triangle
Show Answer

OR gate with an inversion circle


85. What is the Boolean equation for a NOR gate?
(a) X = A + B
(b) X = AB
(c) X = A \div B
(d) X = \overline{(A+B)}
Show Answer

X = \overline{(A+B)}


86. What is the truth table output of a NOR gate when both inputs (A and B) are high (1)?
(a) 0
(b) 1
(c) Undefined
(d) Variable
Show Answer

0


87. What happens to the output of a NOR gate when either input (A or B) is high (1)?
(a) It remains high
(b) It becomes low
(c) It becomes undefined
(d) It varies based on other factors
Show Answer

It becomes low


88. What does the inversion bar over (A OR B) in the Boolean equation signify?
(a) Logical multiplication
(b) Logical addition
(c) Complement of (A OR B)
(d) Logical subtraction
Show Answer

Complement of (A OR B)


89. What is the general expression for the number of possible combinations of given inputs?
(a) 2n
(b) n^2
(c) \frac{n}{2}
(d) 3n
Show Answer

n^2


90. If there are 4 inputs in any logic gate, how many combinations are possible?
(a) 8 combinations
(b) 12 combinations
(c) 16 combinations
(d) 24 combinations
Show Answer

16 combinations


91. In the automatic light bulb switching scenario, what condition must be met for the street lights to turn on using an AND gate?
(a) Both the light and timer time must be low (0)
(b) Either the light or timer time must be high (1)
(c) Either the light or timer time must be low (0)
(d) Both the light and timer time must be high (1)
Show Answer

Both the light and timer time must be high (1)

Class 10 Physics MCQs (All Chapters)


Jawad Khan

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