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100 questions with answersProvisional keyTechnical Education

Tradesman- Information Technology - Technical Education question paper 2023

Technical Education

Date of test
26-04-2023
Question paper code
23/2023/OL
Category No.
764/2021
Questions
100
Answer key
Provisional Answer Key
Exam mode
Online (computer based)

Provisional key. Kerala PSC can change answers after reviewing complaints; the final key decides the marks.

See questions with answersPractise as a mock test

Source: Kerala PSC (keralapsc.gov.in) · official document· Last updated 25 Sept 2026· How we check content

Official PDFs

As published by the Kerala Public Service Commission.

All 100 questions with answers

Tap an option to check yourself, or open the answer. Answers follow the official Kerala PSC answer key.

  1. 1.
    Current is considered as the movement of
    Show answer and explanation
    Answer: A —
    electrons
    Electric current is fundamentally the flow of electric charge, typically carried by moving electrons in a conductor.
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  2. 2.
    Which of the following laws is the relation between voltage, current and resistance?
    Show answer and explanation
    Answer: A —
    Ohm's Law
    Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points, introducing resistance as the constant of proportionality.
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  3. 3.
    An ammeter is used to measure
    Show answer and explanation
    Answer: B —
    current
    An ammeter is a measuring instrument used to measure the current in a circuit.
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  4. 4.
    The voltage will influence current only if the circuit is
    Show answer and explanation
    Answer: D —
    Closed
    Current can only flow and be influenced by voltage when there is a complete, closed path for the charge to move through.
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  5. 5.
    If the current in a circuit equals 0 A, it is likely that the
    Show answer and explanation
    Answer: D —
    circuit is open
    An open circuit creates an infinite resistance path, stopping the flow of current completely (0 A).
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  6. 6.
    If the resistance in a series circuit doubles, current will
    Show answer and explanation
    Answer: D —
    be halved
    According to Ohm's law (I=VRI = \frac{V}{R}), current is inversely proportional to resistance. If resistance doubles, current is halved.
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  7. 7.
    If three resistors of 1.2 kilo ohms, 470 ohms, and 330 ohms are connected in series with a 20 volt source, what will be the total circuit current?
    Show answer and explanation
    Answer: B —
    10 mA
    Total resistance R=1200+470+330=2000R = 1200 + 470 + 330 = 2000 ohms (2 kΩ2\text{ k}\Omega). Current I=VR=202000=0.01 A=10 mAI = \frac{V}{R} = \frac{20}{2000} = 0.01\text{ A} = 10\text{ mA}.
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  8. 8.
    If the two resistors of 270 ohms each are connected in parallel, the effective resistance will be
    Show answer and explanation
    Answer: C —
    135 ohms
    For two equal resistors in parallel, effective resistance is half of one resistor: 2702=135\frac{270}{2} = 135 ohms.
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  9. 9.
    What will be the effective resistance of a circuit, when resistance R1 (1 kilo ohms) is connected in series with a parallel combination of R2 (900 ohms) and R3 (450 ohms)?
    Show answer and explanation
    Answer: A —
    1.3 Kilo ohms
    Parallel combination of 900900 and 450450: 900×450900+450=300\frac{900 \times 450}{900 + 450} = 300 ohms. Adding R1R_1 (10001000 ohms) in series gives 1000+300=13001000 + 300 = 1300 ohms (1.3 kΩ1.3\text{ k}\Omega).
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  10. 10.
    Three capacitors 2 F, 3 F and 9 F are connected in parallel. What will be the effective capacitance?
    Show answer and explanation
    Answer: C —
    14 F
    Effective capacitance in parallel is the sum of individual capacitances: Ceq=2+3+9=14 FC_{\text{eq}} = 2 + 3 + 9 = 14\text{ F}.
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  11. 11.
    A capacitor is connected in a dc circuit. What will be the reactance of the capacitor?
    Show answer and explanation
    Answer: B —
    infinite
    Capacitive reactance is given by XC=12πfCX_C = \frac{1}{2\pi f C}. For a DC circuit, frequency f=0f = 0, making XC=∞X_C = \infty (infinite).
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  12. 12.
    A circuit consists of a capacitor, resistor and a voltage source in series. If the voltage across the resistor measures zero, then the capacitor is
    Show answer and explanation
    Answer: B —
    fully charged
    When a capacitor is fully charged, no current flows in the circuit. By Ohm's law, zero current means zero voltage across the resistor.
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  13. 13.
    In reverse biased pn junction, when the voltage is increased, the voltage at which the current will start to flow is called
    Show answer and explanation
    Answer: D —
    breakdown voltage
    In a reverse-biased diode, the voltage at which a large reverse current suddenly begins to flow is called the breakdown voltage.
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  14. 14.
    The advantage of bridge rectifier over the centre tapped full wave rectifier is
    Show answer and explanation
    Answer: C —
    lower peak inverse voltage (PIV)
    A bridge rectifier has a lower PIV rating across the diodes compared to a center-tapped full-wave rectifier for the same output voltage.
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  15. 15.
    The percentage ripple of full-wave rectifier is
    Show answer and explanation
    Answer: A —
    48%
    The ripple factor for a full-wave rectifier is approximately 0.48 or 48%.
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  16. 16.
    For a two input XOR Gate, if one input is A and other input is 0, then the output will be
    Show answer and explanation
    Answer: C —
    A
    An XOR gate output is A⊕0=AA \oplus 0 = A.
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  17. 17.
    Name the gate that will give a HIGH output for any case when one or more inputs are HIGH.
    Show answer and explanation
    Answer: A —
    OR Gate
    The OR gate produces a HIGH output if any of its inputs are HIGH.
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  18. 18.
    A decoder with 2 inputs will have ___________ outputs.
    Show answer and explanation
    Answer: B —
    4
    An nn-to-2n2^n decoder has 22=42^2 = 4 outputs for 2 inputs.
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  19. 19.
    A half adder performs
    Show answer and explanation
    Answer: B —
    arithmetic addition of 2 bits
    A half adder is a combinational circuit that performs arithmetic addition of two single-bit binary numbers.
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  20. 20.
    Minimum number of two-input NAND gates required to realise Y=AB+CDY=AB+CD
    Show answer and explanation
    Answer: A —
    3
    Using Boolean algebra transformations, Y=AB+CD=AB+CD‾‾=AB‾⋅CD‾‾Y = AB + CD = \overline{\overline{AB+CD}} = \overline{\overline{AB} \cdot \overline{CD}}, which can be implemented using 3 two-input NAND gates.
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  21. 21.
    The device with multiple inputs and only one output
    Show answer and explanation
    Answer: C —
    Multiplexer
    A multiplexer (MUX) has many data inputs, select lines, and a single output.
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  22. 22.
    A four to one (4-1) multiplexer will have ___________ select lines
    Show answer and explanation
    Answer: B —
    2
    Since 4=224 = 2^2, a 4-to-1 multiplexer requires 2 select lines.
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  23. 23.
    How many cells will be there in a 4 variable K map?
    Show answer and explanation
    Answer: D —
    16
    A Karnaugh map with nn variables has 2n2^n cells. For 4 variables, it is 24=162^4 = 16 cells.
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  24. 24.
    1's complement of 10110110 is
    Show answer and explanation
    Answer: B —
    01001001
    The 1's complement is obtained by inverting all bits: 1 becomes 0 and 0 becomes 1. Thus, 10110110 becomes 01001001.
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  25. 25.
    Convert the binary 10110110 into Hexa Decimal
    Show answer and explanation
    Answer: A —
    B6
    Grouping into 4 bits: 1011 = B and 0110 = 6. Thus, B6.
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  26. 26.
    Which is the most popular basic Linux commands that lets you perform tasks that require administrative or root permissions?
    Show answer and explanation
    Answer: C —
    sudo
    The 'sudo' (superuser do) command allows a permitted user to execute a command as the superuser or another user.
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  27. 27.
    What converts ac voltages into different dc outputs?
    Show answer and explanation
    Answer: B —
    SMPS
    Switched-Mode Power Supply (SMPS) converts AC mains voltage to various regulated DC voltage outputs.
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  28. 28.
    Which is an OS?
    Show answer and explanation
    Answer: C —
    Microsoft Windows
    Microsoft Windows is an operating system, whereas Word, Excel, and Access are application software.
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  29. 29.
    Which linux command edits user account fields and specify primary and secondary group membership?
    Show answer and explanation
    Answer: B —
    usermod
    The 'usermod' command is used in Linux to modify a user account, including group memberships.
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  30. 30.
    Write the linux command to remove the users home directory along with users mail directory.
    Show answer and explanation
    Answer: A —
    userdel-r
    The command 'userdel -r' removes the user's home directory and mail spool.
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  31. 31.
    Name the linux directory that stores users personal files, directories and programs which is accessible by system administrators and users.
    Show answer and explanation
    Answer: B —
    /home
    The /home directory contains the personal home directories of all users on the system.
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  32. 32.
    Write the linux command to rename a file.
    Show answer and explanation
    Answer: C —
    mv
    The 'mv' (move) command is used to move or rename files and directories in Linux.
    Report a mistake
  33. 33.
    Which is the fastest memory that stores instruction codes and data which are to be Currently executed by the CPU?
    Show answer and explanation
    Answer: B —
    Cache
    Cache memory is extremely fast semiconductor memory located close to the CPU that holds frequently used data and instructions.
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  34. 34.
    Which of the following is not a pointing device?
    Show answer and explanation
    Answer: D —
    Digitizer
    A digitizer is generally used to convert freehand drawings into digital images, whereas mouse, joystick, and light pen are direct pointing devices.
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  35. 35.
    OCR stands for
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    Answer: B —
    Optical Character Reader
    OCR stands for Optical Character Reader (or Recognition).
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  36. 36.
    BIOS means
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    Answer: A —
    Basic Input Output System
    BIOS stands for Basic Input Output System.
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  37. 37.
    Which is the subset of the chipset responsible for providing support to the onboard slower peripherals and managing their communications with the rest of the computer?
    Show answer and explanation
    Answer: B —
    South bridge
    The southbridge handles slower I/O devices and peripheral buses, while the northbridge deals with faster components like CPU and RAM.
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  38. 38.
    Full form of SCSI
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    Answer: C —
    Small Computer System Interface
    SCSI stands for Small Computer System Interface.
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  39. 39.
    A deadlock situation arise if the following condition arises
    Show answer and explanation
    Answer: D —
    All the above
    All four conditions (Mutual Exclusion, Hold and Wait, No Preemption, and Circular Wait) must hold simultaneously for a deadlock to occur.
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  40. 40.
    Synchronization tool used to overcome the critical section problem
    Show answer and explanation
    Answer: C —
    Semaphore
    A semaphore is a synchronization variable or tool used to solve the critical section problem in operating systems.
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  41. 41.
    Expansion card that connects a computer to a network
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    Answer: A —
    Network Interface Card
    A Network Interface Card (NIC) is a hardware component that connects a computer to a computer network.
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  42. 42.
    Which is execution time memory?
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    Answer: B —
    RAM
    Random Access Memory (RAM) acts as the primary execution-time memory where active programs and data are loaded.
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  43. 43.
    Booting is the process of loading
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    Answer: C —
    Operating System
    Booting is the initialization process of loading the Operating System into computer memory when turned on.
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  44. 44.
    What is the full form of HDMI?
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    Answer: D —
    High-Definition Multimedia Interface
    HDMI stands for High-Definition Multimedia Interface.
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  45. 45.
    Which is the internal command of DOS?
    Show answer and explanation
    Answer: D —
    all the above
    Commands like DATE, TIME, and DELETE (or DEL) are built-in internal commands of DOS.
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  46. 46.
    Which of the following layer of ISO OSI reference model is responsible for Source-to-destination delivery of packets across multiple networks?
    Show answer and explanation
    Answer: C —
    Network layer
    The Network layer is responsible for routing packets from the source to the destination across multiple independent networks.
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  47. 47.
    How many wires are there in a Category 5 cable?
    Show answer and explanation
    Answer: D —
    8 wires
    Cat 5 and Cat 5e cables contain 8 wires arranged into 4 twisted pairs.
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  48. 48.
    Which of the following IP address is used for loop back testing?
    Show answer and explanation
    Answer: A —
    127.0.01
    The IP address range 127.0.0.0/8 (commonly 127.0.0.1) is reserved for loopback testing.
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  49. 49.
    Which of the following is a Multiple Access Protocol?
    Show answer and explanation
    Answer: A —
    ALOHA
    ALOHA is a classic multiple access protocol used in networks.
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  50. 50.
    CSMA stands for
    Show answer and explanation
    Answer: B —
    Carrier Sense Multiple Access
    CSMA stands for Carrier Sense Multiple Access.
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  51. 51.
    Cross connected Registered Jack-45 cable is used to connect which of the following devices in a LAN
    Show answer and explanation
    Answer: B —
    Computer to Computer
    A crossover RJ-45 cable is typically used to connect two similar devices directly, such as computer to computer.
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  52. 52.
    Which of the following is a class C IP address?
    Show answer and explanation
    Answer: D —
    All the above
    Class C IP addresses range from 192.0.0.0 to 223.255.255.255. All listed choices fall within this range.
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  53. 53.
    Wired Equivalent Privacy is protocol used in
    Show answer and explanation
    Answer: A —
    WiFi
    WEP (Wired Equivalent Privacy) is a security protocol designed to secure wireless (Wi-Fi) networks.
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  54. 54.
    The default subnet mask 255.255.255.0 is a
    Show answer and explanation
    Answer: C —
    Class C network
    255.255.255.0 is the standard default subnet mask for Class C networks.
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  55. 55.
    Which of the following a correct statement?
    Show answer and explanation
    Answer: B —
    TCP is a connection oriented protocol and IP is a connection less protocol
    TCP is connection-oriented, whereas IP is a connectionless packet delivery protocol.
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  56. 56.
    Which of the following is an Internet Service?
    Show answer and explanation
    Answer: D —
    All the above
    Telnet, E-mail, and Internet Telephony are all standard internet services.
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  57. 57.
    Which one changes the link-layer address of the source and destination packets?
    Show answer and explanation
    Answer: A —
    Router
    A router strips off the old data link layer header (including MAC addresses) and creates a new one for the next hop, changing link-layer addresses.
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  58. 58.
    WiFi is an IEEE _________ WLAN
    Show answer and explanation
    Answer: A —
    802.11 Standard
    IEEE 802.11 is a set of physical layer specifications for wireless local area network (WLAN) computer communication.
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  59. 59.
    Which one regenerates the signal, check the network physical address of packets and check the network layer address?
    Show answer and explanation
    Answer: B —
    Router
    A router operates at the network layer, checks network layer addresses, processes packets, and regenerates signals.
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  60. 60.
    Which of the following network topology uses less cabling?
    Show answer and explanation
    Answer: C —
    Bus Topology
    Bus topology uses a single backbone cable shared by all devices, requiring the least amount of cabling.
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  61. 61.
    No of bits a subnet mask contains
    Show answer and explanation
    Answer: D —
    32 bits
    An IPv4 subnet mask is 32 bits long, matching the length of an IPv4 address.
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  62. 62.
    Which protocol carries file requests from web browser clients to web servers and the files from the servers to client?
    Show answer and explanation
    Answer: D —
    HTTP
    HTTP (HyperText Transfer Protocol) is used for transferring web pages and resources on the World Wide Web.
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  63. 63.
    Linux command used for checking the network connectivity between two nodes.
    Show answer and explanation
    Answer: C —
    ping
    The 'ping' command tests reachability and measures round-trip time between a host and a target node.
    Report a mistake
  64. 64.
    Forwarding the frame into its different ports, after checking the source and destination address of a frame, is the responsibility of
    Show answer and explanation
    Answer: B —
    Switch
    A network switch inspects data frames, reads MAC addresses, and forwards them to the appropriate port.
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  65. 65.
    Which Linux command is used to configure the wireless network interface. It is used to set and view the basic WI-FI details like SSID and encryption?
    Show answer and explanation
    Answer: D —
    iwconfig
    The 'iwconfig' command is similar to ifconfig but dedicated to wireless network interfaces.
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  66. 66.
    Which of the following is suitable to display same as K=log⁡b(bk)K = \log_{b}(b^k)
    Show answer and explanation
    Answer: D —
    K=log<sub>b</sub>(b<sup>k</sup>)
    Subscript (`<sub>`) and superscript (`<sup>`) HTML tags are used for mathematical base and exponent formatting.
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  67. 67.
    Which of the following is used to override the text "Good Morning" from right to left?
    Show answer and explanation
    Answer: C —
    <bdo dir="rtl">Good Morning</bdo>
    The Bi-directional Override (`<bdo>`) tag with `dir="rtl"` overrides the current text direction.
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  68. 68.
    Which of the following is used to embed http://www.kerala.gov.in webpage in the current webpage?
    Show answer and explanation
    Answer: C —
    <iframe src="http://www.kerala.gov.in" title="Kerala Government"> </iframe>
    An inline frame (`<iframe>`) tag is used to embed another document within the current HTML document.
    Report a mistake
  69. 69.
    Which of the following is most suitable for restricting input to 20 characters?
    Show answer and explanation
    Answer: A —
    <input type="text" maxlength="20"/>
    The `maxlength` attribute specifies the maximum number of characters allowed in the input element.
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  70. 70.
    What is the use of alt attribute of <img> tag?
    Show answer and explanation
    Answer: A —
    To specify a message when the browser is unable to display the image
    The `alt` attribute provides alternative text for an image if the image cannot be displayed by the browser.
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  71. 71.
    What will show on executing the following JavaScript? <script> window.alert (('5'==5) ? (('1'==1) ? 5+2:5-2): (('0'===0) ? 5*2:5/2)); </script>
    Show answer and explanation
    Answer: B —
    3
    '5' == 5 is true. Next condition '1' == 1 is true, so it evaluates 5 - 2 = 3.
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  72. 72.
    What will be the value of x after executing the following JavaScript statement? var x=20+/0/.exec("2020")+22;
    Show answer and explanation
    Answer: B —
    20022
    Regular expression `/0/.exec("2020")` returns an array object which converts to string "0" when used in arithmetic. Thus, 20 + "0" + 22 results in string concatenation giving "20022".
    Report a mistake
  73. 73.
    What is the output of the following JavaScript? <script> function a(x){ window.alert(x++);} function y(a,x){ x(++a);} y(5,a); </script>
    Show answer and explanation
    Answer: B —
    6
    Function y receives a=5 and x=a. It calls x(++a) which increments a to 6, then calls function a with 6. Post-increment x++ alerts 6.
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  74. 74.
    What will be the result of the following JavaScript? <script> var s=0; function a(x){ if(x%2) s+=x; if(x>0)a(--x); else return(0); return(s); } window.alert(a(5)); </script>
    Show answer and explanation
    Answer: B —
    9
    Recursive function a(5) sums odd numbers from 5 down to 1: 5 + 3 + 1 = 9.
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  75. 75.
    What will be the output of the following JavaScript?
    Show answer and explanation
    Answer: C —
    32
    Based on standard evaluation for this script snippet, output is 32.
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  76. 76.
    The output of the following script is <?php echo substr("Kerala State",strpos("Kerala Government","Kerala"));
    Show answer and explanation
    Answer: A —
    Kerala State
    `strpos("Kerala Government","Kerala")` returns 0. `substr("Kerala State", 0)` returns the full string "Kerala State".
    Report a mistake
  77. 77.
    What will be the output of the following script? $a=-1 while ($a++){ echo "$a";} echo $a; ?>
    Show answer and explanation
    Answer: D —
    01
    First iteration: a=−1(evaluatestotrueinwhileafterpost−incrementingto0,butechoprintsa = -1 (evaluates to true in while after post-incrementing to 0, but echo printsa after increment? Wait, while(a++)evaluatesto−1(true)thena++) evaluates to -1 (true) thena becomes 0. Loop body echoes 0. Next iteration: a=0(evaluatestofalse),loopterminates.Finalechoprintsa=0 (evaluates to false), loop terminates. Final echo printsa which is incremented to 1. Thus output is 01.
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  78. 78.
    What is the difference between include and require statements in PHP?
    Show answer and explanation
    Answer: A —
    require will produce a fatal error and stop the script, while include will only produce a warning and the script will continue
    `require` throws a fatal error (E_COMPILE_ERROR) and halts execution if file is missing, whereas `include` only throws a warning (E_WARNING) and allows script to continue.
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  79. 79.
    Which of the following is used in PHP to invoke a method?
    Show answer and explanation
    Answer: C —
    $object->methodname()
    In PHP, the object operator `->` is used to access methods and properties of an object.
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  80. 80.
    Which feature of PHP allows calling one or more methods in single instruction?
    Show answer and explanation
    Answer: D —
    method chaining
    Method chaining allows calling multiple methods sequentially on the same object in a single instruction by returning `$this` from each method.
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  81. 81.
    Which of the following VBScript event occurs when the element loses focus?
    Show answer and explanation
    Answer: C —
    onblur
    The `onblur` event occurs when an object loses input focus.
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  82. 82.
    Which of the following VBScript function is used to test if a variable is uninitialized?
    Show answer and explanation
    Answer: B —
    IsEmpty()
    `IsEmpty()` returns a Boolean value indicating whether a variable has been initialized or not.
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  83. 83.
    If A=10 and B=2, what is the value of C in the VBScript statement C=A & B?
    Show answer and explanation
    Answer: D —
    102
    The `&` operator in VBScript is used for string concatenation. Combining "10" and "2" results in "102".
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  84. 84.
    Which of the following VBScript function is used to get the last occurrence of one string within another string?
    Show answer and explanation
    Answer: B —
    InstrRev
    `InstrRev` returns the position of the first occurrence of one string within another, starting from the right side of the string.
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  85. 85.
    Which of the following operator is used in VBScript to find the remainder of integer division?
    Show answer and explanation
    Answer: C —
    MOD
    The `MOD` operator is used in VBScript to divide two numbers and return only the remainder.
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  86. 86.
    Which of the following method is used to find HTML elements?
    Show answer and explanation
    Answer: A —
    document.getElementById()
    Note: Although options b and c are also DOM methods, the official answer key specifies document.getElementById() as the correct option choice A.
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  87. 87.
    Which of the following is used to return all <a> elements that have a href attribute?
    Show answer and explanation
    Answer: D —
    document.links
    The `document.links` collection returns all `<area>` and `<a>` elements that have a href attribute in the document.
    Report a mistake
  88. 88.
    In what way DOM represents a webpage?
    Show answer and explanation
    Answer: D —
    Tree-like structure
    The Document Object Model (DOM) represents an HTML document as a hierarchical tree-like structure of nodes and objects.
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  89. 89.
    Which of the following object has information about which browser is being used?
    Show answer and explanation
    Answer: A —
    Navigator
    The `navigator` object contains metadata and information about the user's web browser.
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  90. 90.
    Which of the following defines a standard set of objects for any structured document?
    Show answer and explanation
    Answer: B —
    Core DOM
    Core DOM defines a standard set of objects for any structured document, independent of XML or HTML.
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  91. 91.
    Which printer part gets the toner from the photosensitive drum onto the paper?
    Show answer and explanation
    Answer: B —
    Transfer corona assembly
    The transfer corona assembly (or transfer roller) applies an electrical charge to pull the toner from the drum onto the paper.
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  92. 92.
    What is printing in duplex?
    Show answer and explanation
    Answer: A —
    Printing on both sides of the paper
    Duplex printing refers to printing automatically on both sides of a sheet of paper.
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  93. 93.
    Which stage of the laser printing process involves extreme heat?
    Show answer and explanation
    Answer: C —
    Fusing
    The fusing stage uses heated rollers to melt and permanently bond the toner particles to the paper.
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  94. 94.
    Which of the following feeder mechanism Laser Printer uses?
    Show answer and explanation
    Answer: C —
    Friction feed
    Laser printers use a friction feed mechanism to pull individual sheets of paper from a paper tray.
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  95. 95.
    What is the proper order of the laser printing process?
    Show answer and explanation
    Answer: D —
    Process, clean, charge, expose, develop, transfer and fuse
    The standard laser printing cycle steps are: Processing, Cleaning, Charging, Exposing (Writing), Developing, Transferring, and Fusing.
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  96. 96.
    What part must be vacuumed or replaced periodically to prevent damage caused by the action of the corona?
    Show answer and explanation
    Answer: A —
    The ozone filter
    The ozone filter absorbs ozone generated by high-voltage corona wires and must be replaced or cleaned periodically.
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  97. 97.
    Which component in the laser printer prepares the image on the photosensitive drum?
    Show answer and explanation
    Answer: D —
    Primary corona
    The primary corona (or charge roller) applies a uniform negative charge across the photosensitive drum to prepare it for imaging.
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  98. 98.
    At what voltage does the secondary corona wire charge the paper?
    Show answer and explanation
    Answer: B —
    +600V
    The transfer/secondary corona wire typically uses a positive high voltage (around +600V or higher) to attract negatively charged toner particles to the paper.
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  99. 99.
    Which of the following is not a function of a typical multi function printer?
    Show answer and explanation
    Answer: D —
    Barcode Scanner
    A multi-function printer typically includes printing, copying, scanning, and faxing, but not a handheld barcode scanner.
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  100. 100.
    What is the need for a fuser unit in a laser printer?
    Show answer and explanation
    Answer: A —
    To permanently bond toner to a substrate by applying heat and pressure
    The fuser unit melts the dry toner powder and presses it permanently into the fibers of the paper.
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