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 |
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
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
Explanation
Two Types of Transmission Media
- Wired or Guided Media or Bound Transmission Media
- 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
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.