first layer of OSI Model
Which layer of Open Systems Interconnection (OSI) Model is placed on first number?
  1. Application Layer
  2. Presentation Layer
  3. Physical Layer
  4. Networking Layer
Correct Answer is: Physical Layer
First layer of osi model is Physical Layer

_________ is  primary function of layer-1 (Physical Layer) in the OSI model?

  1. A) Error detection
  2. B) Data encryption
  3. C) Bit synchronization
  4. D) Protocol routing

Answer: C) Bit synchronization

Below the following options ________ devices operates at the Physical layer of the OSI model?

  1. A) Router
  2. B) Repeater
  3. C) Switch
  4. D) Firewall

Answer: B) Repeater

 Physical layer define________ in the OSI model?

  1. A) Data packet structure
  2. B) Logical addressing
  3. C) Data transmission rate
  4. D) Session establishment

 

 

________ is  NOT a characteristic of the Layer – 1 (Physical layer)?

  1. A) Encoding
  2. B) Flow control
  3. C) Transmission mode
  4. D) Signaling

Answer: B) Flow control

Which of the following performed by  Physical layer?

  1. A) Segmentation
  2. B) Error correction
  3. C) Framing
  4. D) Bit synchronization

Answer: D) Bit synchronization

_____ is NOT an example of Physical layer media?

  1. A) Fiber optic cable
  2. B) Twisted pair cable
  3. C) Wireless transmission
  4. D) IP address

Answer: D) IP address

At which layer of the OSI model are electrical, mechanical, and procedural specifications defined?

  1. A) Data Link layer
  2. B) Network layer
  3. C) Transport layer
  4. D) Physical layer

Answer: D) Physical layer

Which of the following is the primary purpose of the Physical layer?

  1. A) Data encryption
  2. B) Data compression
  3. C) Data transmission
  4. D) Data routing

Answer: C) Data transmission

What is the unit of data at the Physical layer?

  1. A) Segment
  2. B) Packet
  3. C) Frame
  4. D) Bit

Answer: D) Bit

_________ is NOT a function of the Physical layer?

  1. A) Voltage regulation
  2. B) Signal modulation
  3. C) Data framing
  4. D) Error detection

Answer: A) Voltage regulation

What is the role of the Physical layer in the OSI model?

  1. A) Ensuring end-to-end communication
  2. B) Routing packets between networks
  3. C) Encoding and decoding data
  4. D) Formatting data for presentation

Answer: C) Encoding and decoding data

_______ is NOT a characteristic of the Physical layer?

  1. A) Transmission medium
  2. B) Data encryption
  3. C) Signal timing
  4. D) Data rate

Answer: B) Data encryption

Which of the following is NOT a responsibility of the Physical layer?

  1. A) Collision detection
  2. B) Signal attenuation
  3. C) Data compression
  4. D) Data transmission

Answer: C) Data compression

What does the Physical layer ensure regarding data transmission?

  1. A) Data integrity
  2. B) Data encryption
  3. C) Data compression
  4. D) Data routing

Answer: A) Data integrity

Which of the following devices operates at the Physical layer and regenerates signals?

  1. A) Router
  2. B) Hub
  3. C) Switch
  4. D) Gateway

Answer: B) Hub

What is the primary concern of the Physical layer?

  1. A) Data transmission errors
  2. B) Network congestion
  3. C) Protocol conversion
  4. D) Signal integrity

Answer: D) Signal integrity

_________ NOT a function of the Physical layer?

  1. A) Error detection
  2. B) Data encryption
  3. C) Signal conversion
  4. D) Medium access control

Answer: B) Data encryption

Which layer of the OSI model is responsible for converting data packets into electrical signals for transmission?

  1. A) Data Link layer
  2. B) Network layer
  3. C) Transport layer
  4. D) Physical layer

Answer: D) Physical layer

Which of the following is a concern of the Physical layer?

  1. A) Packet routing
  2. B) Data compression
  3. C) Signal attenuation
  4. D) Session establishment

Answer: C) Signal attenuation

________ is NOT a function of the Physical layer?

  1. A) Protocol negotiation
  2. B) Medium access control
  3. C) Bit synchronization
  4. D) Signal modulation

Answer: A) Protocol negotiation

Which layer of the OSI model ensures the physical connection between devices?

  1. A) Data Link layer
  2. B) Network layer
  3. C) Transport layer
  4. D) Physical layer

Answer: D) Physical layer

______ is  NOT a characteristic of the Physical layer?

  1. A) Data encoding
  2. B) Error correction
  3. C) Signal modulation
  4. D) Medium access control

Answer: B) Error correction

Which layer of the OSI model deals with the transmission and reception of raw data?

  1. A) Application layer
  2. B) Data Link layer
  3. C) Transport layer
  4. D) Physical layer

Answer: D) Physical layer

Which of the following is a concern of the Physical layer?

  1. A) Packet sequencing
  2. B) Data encryption
  3. C) Signal propagation delay
  4. D) Routing table maintenance

Answer: C) Signal propagation delay

_______  primary function of the Physical layer in the OSI model?

  1. A) Segmenting data
  2. B) Multiplexing signals
  3. C) Converting bits into electrical signals
  4. D) Establishing a connection-oriented session

Answer: C) Converting bits into electrical signals

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