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12th Standard Computer Applications — Network Cabling: Additional MCQs with Answers & Explanations

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15 extra multiple-choice questions for Network Cabling (12th Standard Computer Applications, Samacheer Kalvi), beyond the ones printed in the textbook — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.

Answer key at a glance

Q1B Q2C Q3C Q4C Q5C Q6B Q7C Q8C Q9A Q10A Q11B Q12B Q13B Q14C Q15B
Q1
Who invented Ethernet in 1973 while working at Xerox PARC?
  • A. Tim Berners Lee
  • B. Bob MetcalfeCorrect
  • C. Charles Babbage
  • D. Vint Cerf
Explanation. Bob Metcalfe invented Ethernet in 1973 at Xerox PARC, and Xerox patented it in 1975.
Q2
What is the data transfer rate of the USB 3.0 version?
  • A. 10 Mbps
  • B. 480 Mbps
  • C. 4.85 GbpsCorrect
  • D. 100 Mbps
Explanation. The latest version of USB, USB 3.0, has a high data transfer rate of 4.85 Gbps.
Q3
Which Registered Jack connector is commonly known as the champ or Amphenol connector?
  • A. RJ-11
  • B. RJ-14
  • C. RJ-21Correct
  • D. RJ-45
Explanation. The RJ-21 connector contains 50 pins and is also called the champ or Amphenol connector, typically used for trunking.
Q4
How many bits of data does a parallel interface cable transmit at a time compared to a serial cable?
  • A. 1 bit
  • B. 4 bits
  • C. 8 bitsCorrect
  • D. 16 bits
Explanation. Serial cables send only 1 bit of data at a time, whereas parallel port cables send 8 bits of data simultaneously.
Q5
On an Ethernet port, what does the blinking orange LED light indicate?
  • A. The port is damaged
  • B. Data is transmitting at 10 Mbps
  • C. The Internet is connected and activeCorrect
  • D. The computer is in sleep mode
Explanation. When an Ethernet plug is injected into the port, the orange light starts blinking to indicate that the Internet is connected.
Q6
Although Ethernet cables contain four pairs of wires, which two pairs (colors) are actually used for transmitting and receiving data in Ethernet?
  • A. Blue and Brown
  • B. Orange and GreenCorrect
  • C. Orange and Blue
  • D. Green and Brown
Explanation. Ethernet uses only two pairs of wires: Orange and Green. The other two pairs, Blue and Brown, are reserved for other connections.
Q7
In the RJ45 connector wiring scheme, which pin is used as the positive terminal to receive data (Rx+)?
  • A. Pin 1
  • B. Pin 2
  • C. Pin 3Correct
  • D. Pin 6
Explanation. According to the pin details, Pin 1 and 2 are for transmitting data (Tx+, Tx-), while Pin 3 is the positive receiving terminal (Rx+).
Q8
In roll-over wiring, which pin on one end of the cable is connected to Pin 3 on the other end?
  • A. Pin 3
  • B. Pin 5
  • C. Pin 6Correct
  • D. Pin 8
Explanation. In rollover cabling, the connections are completely reversed. Pin 3 on one end connects to Pin 6 on the opposite end.
Q9
Which type of fiber optic cable is designed for long-distance transmission at a higher cost?
  • A. Single-modeCorrect
  • B. Multi-mode
  • C. Thinnet
  • D. Shielded Twisted Pair
Explanation. Single-mode fiber optic cables are used for long-distance transmission at a high cost, while multi-mode is for short distances.
Q10
What is the typical speed at which coaxial cables transfer information?
  • A. 10 mbpsCorrect
  • B. 100 mbps
  • C. 1 Gbps
  • D. 4.85 Gbps
Explanation. Coaxial cables are used to transfer information at a speed of 10 mbps and are classified into thinnet and thicknet.
Q11
What is the primary structural difference between Shielded Twisted Pair (STP) and Unshielded Twisted Pair (UTP) cables?
  • A. STP has only 4 wires inside
  • B. STP contains an additional outer protective jacketCorrect
  • C. STP is much thinner than UTP
  • D. STP does not twist its inner wires
Explanation. STP is structurally similar to UTP but features an additional outer jacket to protect the copper wires from external electromagnetic interference.
Q12
When connecting a personal computer's network interface card (NIC) to a hub, which Ethernet wiring arrangement is typically used?
  • A. Crossover Wiring
  • B. Straight-Through WiringCorrect
  • C. Roll-over Wiring
  • D. Null-Modem Wiring
Explanation. Straight-through cables maintain the same pin sequence at both ends and are primarily used to connect a PC's NIC to a hub.
Q13
To connect two computers directly together without using a hub, which pins on one end of a crossover cable connect to Pins 1 and 2 on the other end?
  • A. Pins 1 and 2
  • B. Pins 3 and 6Correct
  • C. Pins 4 and 5
  • D. Pins 7 and 8
Explanation. In crossover wiring, the Tx and Rx lines are crossed so that Pins 1 and 2 on one end connect to Pins 3 and 6 on the other.
Q14
What is the name of the small peripheral device with a SIM slot that connects a computer to mobile broadband and acts as a modem?
  • A. Registered Jack
  • B. Router
  • C. DongleCorrect
  • D. Ethernet card
Explanation. A dongle is a small USB peripheral that houses a SIM slot, allowing computers to connect to cellular networks as a mobile broadband modem.
Q15
How many pins are found in a modern RJ-11 registered jack used for telephone landlines?
  • A. 4 pins
  • B. 6 pinsCorrect
  • C. 8 pins
  • D. 50 pins
Explanation. The RJ-11 is a popular registered jack for telephones that contains 6 pins, where two are for transmitting, two for receiving, and two are reserved.
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Book Back Questions10 textbook MCQs · solved Practice TestInteractive · instant score Book Back TestTest yourself on the textbook set Additional MCQ TestTest yourself on the extra set Study NotesConcepts & methods Formula SheetAll key formulas

About these Network Cabling questions

These are the Additional multiple-choice questions for Network Cabling from the Tamil Nadu State Board (Samacheer Kalvi) 12th Standard Computer Applications syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.

Frequently asked questions

How many MCQs are there in Network Cabling?

This chapter has 15 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.

Are these 12th Standard Computer Applications MCQs free to practise online?

Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.

Where can I find the Network Cabling book-back answers?

The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.

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