3i Infotech Placement: Sample Questions 675 - 677 of 1245

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Question 675

Question MCQ▾

A car travels 15 kms on a liter of petrol. When it is driven at 60 kms per hour it only goes 80% as far. How many liters of petrol will it take to travel 120 kms driving at 60 kms per hour?

Choices

Choice (4)

a.

8

b.

2

c.

9.6

d.

6.4

Edit

Answer

c.

Explanation

A car travels 15 kms on a liter of petrol.

When it is driven 60kms per hour it only goes 80% as far.

We are asked to find how many liters of petrol will be required to travel 120 km distance.

So, 80% of 120 km

Yet car has to travel 24 km distance.

Car needs 1 liter of petrol for 15 km distance

Then, for 24 km distance, car will need = 1.6 liter petrol

So, car will need total liter of petrol to cover distance of 120 km.

Question 676

Write in Short Short Answer▾

What is VDL (View Definition Language) ?

Edit

Explanation

  • This language is used to specify user views and their mapping to conceptual schema.
  • It defines the subset of records available to classes of users.
  • It creates virtual tables and the view appears to users like conceptual level. It specifies user interfaces.

Question 677

Describe in Detail Essay▾

What are the types of transmission media?

Edit

Explanation

Define Transmission Media

Two Types of Transmission Media

  1. Wired or Guided Media or Bound Transmission Media
  2. Wireless or Unguided Media or Unbound Transmission media

Wired or Guided Media or Bound Transmission Media

  • Bound transmission media are the cables limited by the physical geography.
  • Popular bound transmission media include twisted pair cable, co-axial cable, and fiber optical cable.
  • Each has its own characteristics like transmission speed, effect of noise, physical appearance, cost etc.

    3 types of Guided Media:

  • Coaxial cable
    • Very common and widly used commutation media.
    • Named as it contains 2 conductors parallel to each other.
  • Twisted Pairs Cable
    • This is a most popular network medium.
    • Light weight, easy to install, supports many different types of networks.
  • Fiber Optics Cable
    • Previous ones used electrical signals to transmit data.
    • Fiber optics uses light- incredibly fast and high bandwidth
    • As light only moves in one direction- for two way communication a second connection is made between two devices
3 Types of Guided Media

Wireless or Unguided Media or Unbound Transmission Media:

  • Unbound transmission media transmit data without using any cables.
  • Media not bounded by physical geography.
  • Transmission is called Wireless communication.
  • Wireless communication is becoming popular.
  • Wireless LANs are being installed in office and college campuses.
  • This transmission uses microwaves, radio waves, or infra-red media.