CAT Practice Question and Answer

Q: Find the sum of the Arithmetic Series upto 36 terms 2, 5, 8, 11,... 1782 1

  • 1
    3924
    Correct
    Wrong
  • 2
    1962
    Correct
    Wrong
  • 3
    1684
    Correct
    Wrong
  • 4
    1452
    Correct
    Wrong
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Answer : 2. "1962"
Explanation :

Answer: B) 1962 Explanation: Arithmetic Series ::   An Arithmetic Series is a series of numbers in which each term increases by a constant amount.   How to find the sum of the Arithmetic Sequence or Series for the given Series ::   When the series contains a large amount of numbers, its impractical to add manually. You can quickly find the sum of any arithmetic sequence by multiplying the average of the first and last term by the number of terms in the sequence.   That is given by Sn = n(a1 + an)2 Where n = number of terms, a1 = first term, an = last term   Here Last term is given by an = a1 + n-1d where d = common difference   Now given Arithmetic Series is    2, 5, 8, 11,...   Here a1 = 2,  d = 3, n = 36    Now, an= a1 + n - 1d a36= 2 + 36 - 13 = 105 + 2 = 107    Now, Sum to 36 terms is given by   S36 = 36(2 + 107)2 = 36 x 1092 = 39242 = 1962       Therefore, Sum to 36 terms of the series 2, 5, 8, 11,... is 1962.

Q: What goes up and down the stairs without moving? 1782 0

  • 1
    Umbrella
    Correct
    Wrong
  • 2
    Lift
    Correct
    Wrong
  • 3
    Stairs
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 3. "Stairs"
Explanation :

Answer: C) Stairs Explanation: Those are stairs which goes up and down without moving.

Q: Digitized information can be used by computers. 1782 0

  • 1
    TRUE
    Correct
    Wrong
  • 2
    FALSE Answer & Explanation Answer:
    Correct
    Wrong
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Answer : 1. "TRUE"
Explanation :

Answer: A) TRUE Explanation: TRUE. The computers and electronic devices use digitized information which is easily understood by them.   Digitization is the process of converting analog signals or information of any form into a digital format that can be understood by computer systems or electronic devices. The term is used when converting information, like text, images or voices, and sounds, into binary code.

Q: What is conversion operator ? 1782 0

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Answer :
Explanation :

Class can have a public method for specific data type conversions.for example:class B{double value;public  B(int i )operator double(){return value;}};B BObject;double i = BObject; // assigning object to variable i of type double.now conversion operator gets called to assign the value.

Q: A man covered a certain distance at some speed. Had he moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. The distance (in km) is 1782 0

  • 1
    30
    Correct
    Wrong
  • 2
    36
    Correct
    Wrong
  • 3
    40
    Correct
    Wrong
  • 4
    42
    Correct
    Wrong
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Answer : 3. "40"
Explanation :

Answer: C) 40 Explanation: Let distance = x km and usual rate = y kmph.Then, x/y - x/(y+3) = 40/60 --> 2y (y+3) = 9x ----- (i)Also, x/(y-2) - x/y = 40/60 --> y(y-2) = 3x -------- (ii)On dividing (i) by (ii), we get: x = 40 km.

Q: What is the value of 62 tens? 1782 0

  • 1
    6
    Correct
    Wrong
  • 2
    620
    Correct
    Wrong
  • 3
    62
    Correct
    Wrong
  • 4
    2
    Correct
    Wrong
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Answer : 2. "620"
Explanation :

Answer: B) 620 Explanation: Here in the question it is asked that 62 tens, which implies ten times of 62. => 62 x 10 = 620.   Hence, the value of 62 tens = 620.

Q: How old are you if you are born in 1995? 1781 0

  • 1
    22
    Correct
    Wrong
  • 2
    23
    Correct
    Wrong
  • 3
    24
    Correct
    Wrong
  • 4
    25
    Correct
    Wrong
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Answer : 2. "23"
Explanation :

Answer: B) 23 Explanation: Calculating Age has 2 conditions. Let your Birthday is on January 1st. 1. If the month in which you are born is completed in the present year i.e, your birthday, then Your Age = Present year - Year you are born  As of now, present year = 2018 i.e, Age = 2018 - 1995 = 23 years.   2. If the month in which you are born is not completed in the present year i.e, your birthday, then Your Age = Last year - Year you are born As of now, present year = 2018 i.e, Age = 2017 - 1995 = 22 years.

Q: What two scientists established the structure of dna? 1781 0

  • 1
    Rosalind Franklin and Maurice Wilkins
    Correct
    Wrong
  • 2
    James Watson and Francis Crick
    Correct
    Wrong
  • 3
    Rosalind Franklin and Francis Crick
    Correct
    Wrong
  • 4
    James Watson and Maurice Wilkins
    Correct
    Wrong
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Answer : 2. "James Watson and Francis Crick"
Explanation :

Answer: B) James Watson and Francis Crick Explanation: In the early 1950s two scientists, Rosalind Franklin and Maurice Wilkins, studied DNA using x-rays. Franklin produced an x-ray photograph that allowed two other researchers, James Watson and Francis Crick to work out the 3D structure of DNA. The structure of DNA was found to be a double helix.

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