CAT Practice Question and Answer
8Q: Find the sum of the Arithmetic Series upto 36 terms 2, 5, 8, 11,... 1782 15b5cc6afe4d2b4197774d259
5b5cc6afe4d2b4197774d259- 13924false
- 21962true
- 31684false
- 41452false
- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc636e4d2b4197774b9f0
5b5cc636e4d2b4197774b9f0- 1Umbrellafalse
- 2Liftfalse
- 3Stairstrue
- 4All the abovefalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc699e4d2b4197774c73d
5b5cc699e4d2b4197774c73d- 1TRUEtrue
- 2FALSE Answer & Explanation Answer:false
- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc75ce4d2b4197774fc1f
5b5cc75ce4d2b4197774fc1f- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc6d9e4d2b4197774e816
5b5cc6d9e4d2b4197774e816- 130false
- 236false
- 340true
- 442false
- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc67be4d2b4197774c1b8
5b5cc67be4d2b4197774c1b8- 16false
- 2620true
- 362false
- 42false
- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc6a6e4d2b4197774cd5b
5b5cc6a6e4d2b4197774cd5b- 122false
- 223true
- 324false
- 425false
- Show AnswerHide Answer
- Workspace
- SingleChoice
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 05b5cc67ee4d2b4197774c253
5b5cc67ee4d2b4197774c253- 1Rosalind Franklin and Maurice Wilkinsfalse
- 2James Watson and Francis Cricktrue
- 3Rosalind Franklin and Francis Crickfalse
- 4James Watson and Maurice Wilkinsfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
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.

