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[2011 Prelims]

1)What is “virtual private network” ?

(a)    It is a private computer network of an organization where the remote users can transmit encrypted information through the  server of the organization.

(b)    It is a computer network across a public internet the provides users access to their organizations network while maintaining the security of the information transmitted.

(c)    It is a computer network in which users can access a shared pool of computing resources through a service provider.

(d)    None of the statements (a), (b) and (c) given above is correct description of virtual private network.

2)What is the difference between blue-tooth and Wi-Fi  devices ?

(a)    Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band.

(b)    Bluetooth is used for wireless local area networks (WLAN) only, whereas Wi-Fi  is used for wireless wide area networks (WWAN) only.

(c)    When information is transmitted between two devices using blue-tooth technology , the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other.

(d)    The statements (a) and (b) given above are correct in this context. 

3)A new optical disc format known as the blu-ray disc (BD) is becoming popular. In what way is it different from the traditional DVD ?

1.DVD supports standard definition video while BD supports high definition video.

2.Compared to a DVD, the BD format has several times more storage capacity.

3.Thickness of BD is 2.4 mm while that of DVD is 1.2 mm.

Which of the statements given above is/are correct ?

(a)1 only.

(b)1 and  2 only.

(c)2 and 3 only.

(d)1,2 and 3.

[2014 Prelims]

1)In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person?

  1. Iris scanning
  2. Retinal scanning
  3. Voice recognition

Select the correct answer using the code given below.

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

[2015 Prelims]

1)With reference to ‘Near Field Communication (NFC) Technology’, which of the following statements is/are correct?

  1. It is a contactless communication technology that uses electromagnetic radio fields.
  2. NFC is designed for used by devices which can be at a distance of even a metre from each other.
  3. NFC can use encryption when sending sensitive information

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

2)The term ‘IndARC’, sometimes seen in the news, is the name of

(a) an indigenously developed radar system inducted into Indian Defence

(b) India’s satellite to provide services to the countries of Indian Ocean Rim

(c) a scientific establishment set up by India in Antarctic region

(d) India’s underwater observatory to scientifically study the Arctic region

[2017 Prelims]

1) It is possible to produce algae based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry?

  1. Production of algae based biofuels is possible in seas only and not on continents.
  2. Setting up and engineering the algae based biofuel production requires high level of expertise/technology until the construction is completed.
  3. Economically viable production necessitates the setting up of large scale facilities which may raise ecological and social concerns.

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 2 and 3 only

(c) 3 only

(d) 1, 2 and 3

Answer: B

2) Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over Liquid Crystal displays?

  1. OLED displays can be fabricated on flexible plastic substrates.
  2. Roll-up displays embedded in clothing can be made using OLEDs.
  3. Transparent displays are possible using OLEDs.

Select the correct answer using the code given below

(a) 1 and 3 only

(b) 2 only

(c) 1, 2 and 3

(d) None of the above statements is correct

Answer: C