Samsung Papers: Sample Questions 1 - 3 of 15

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Question number: 1

» Aptitude

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A girl is at 11th position from both the ends of a straight row. Then total numbers of girls in the row are?

Explanation

Girl is at 11th position from both the ends of a straight row. So, there are 10 girls at the left side and at the right side of her. So there will be 10 + 10 girls at both sides of her. Including that girl there are total 20 + 1 = 21 girls in the row.

Question number: 2

» Aptitude

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If m people take d days to complete, then m + r people take how many days?

Explanation

  • m people take d days to complete the work.
  • There is indirect proportion between number of men working and days i. e. More man, less days and Less men, more days.
  • Let m + r people take z days to complete the work.
  • So, we can write

  • Therefore, m + r people take days to complete the work.

Question number: 3

» Languages » C & C Plus Plus

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Why channel coding is done? (2004)

Explanation

  • Channel coding is a method to detect and possibly correct errors byintroducing redundancy to the stream of bitsto be sent to the channel. The Channel Encoder will add bits to the message bits to be transmitted systematically. Afterpassing through the channel, the Channel decoder will detect and correct the errors.
  • A simple example is to send ‘000’ (‘111’ correspondingly) instead of sending only one’0’ (‘1’ correspondingly) to the channel. Dueto noise in the channel, the received bitsmay become ‘001’. But since either ‘000’ or’111’ could have been sent. By majority-logic decoding scheme, it willbe decoded as ‘000’ andtherefore the message has been a ‘0’. In general the channel encoder will divides the input message bits into locksof k messages bits and replaces each k messagebits block with a n-bit code word byintroducing (n-k) check bits to each message block. Some major codes include theBlock CodesandConvolutional Codes.