GATE Questions

Q:

In the series given below , how many 8's are there each of which is exactly divisible by its immediate preceeding as well as succeeding numbers ?
2 8 3 8 2 4 8 2 4 8 6 8 2 8 2 4 8 3 8 2 8 6

A) five B) four
C) two D) one
 
Answer & Explanation Answer: C) two

Explanation:

Clearly, we may mark such sets of 3 numbers, in which the middle number is 8 and each of the two numbers on both sides of it is a factor of 8, as shown below :


2 8 3 8 2 4 8 2 4 8 6 8 2 8 2 4 8 3 8 2 8 6

So, there are two such 8's. Hence the answer is C.

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Q:

Which of the following is the most stable carbocation?

Screenshot_(8)1522302473.png image

A) 4 B) 3
C) 2 D) 1
 
Answer & Explanation Answer: C) 2

Explanation:

Here the most stable carbocation is the option (2).

 

Carbocations are always hungry for electrons. The stability of carbocations increases from primary to secondary to tertiary. Here, option (c) shows the most stable carbocation because it can easily withdraw electrons from two other carbon atoms and the more electronegative oxygen atom.

 

Carbocation stability depends on hyperconjugation. The tertiary carbocation is stabilized by electron releasing inductive effect.

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Q:

Which of these illustrates the Secondary Structure of a Protein?

chemistry1519110232.jpg image

A) A B) B
C) C D) D
 
Answer & Explanation Answer: B) B

Explanation:

The Secondary Structure of a Protein is option B)

 

The Secondary Structure of a Protein results from Hydrogen Bonds.

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Q:

Systematic name for (CuI)s ?

A) Copper Iodide B) Cobalt Fluoride
C) Ferrous Oxide D) All of the above
 
Answer & Explanation Answer: A) Copper Iodide

Explanation:

Copper Iodide is the systematic name of the given compound (CuI)s.

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5 8967
Q:

Sripad has scored average of 65 marks in three objects. In no subjects has he secured less than 58 marks. He has secured more marks in Maths than other two subjects. What could be his maximum score in Maths ?

A) 79 B) 77
C) 76 D) 73
 
Answer & Explanation Answer: A) 79

Explanation:

Assuming Sripad has scored the least marks in subject other than science,
Then the marks he could secure in other two are 58 each.
Since the average mark of all the 3 subject is 65.
i.e (58+58+x)/3 = 65
116 + x = 195
x = 79 marks.

Therefore, the maximum marks he can score in maths is 79.

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5 8963
Q:

Which one of the following is an element?

A) Topaz B) Rruby
C) Diamond D) Sapphire
 
Answer & Explanation Answer: C) Diamond

Explanation:

Here in the given options, Diamond is an element as it is the allotrope of the carbon atom.

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14 8955
Q:

In a certain code DOWN is written as '5@9#' and NAME is written as '#6%3'. How is MODE written in that code ?

A) 6@53 B) %@53
C) 53%# D) %#35
 
Answer & Explanation Answer: B) %@53

Explanation:

From the given information :

D O W N A M E == 5 @ 9 # 6 % 3
MODE = %@53

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20 8939
Q:

Solve the Riddle?

bana1522056999.jpg image

A) 79 hrs B) 72 hrs
C) 52 hrs D) 18 hrs
 
Answer & Explanation Answer: D) 18 hrs

Explanation:

From the given data,

18 snakes can eat 18 bananas in 18 hrs.

=> 1 snake can eat 1 banana in 18 hrs

=> 79 snakes can eat 79 bananas in 18 hrs.

 

Hence, 18 hrs.

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