3100+ Mental Ability Reasoning Questions and Answers with Explanation

Q:

What is the next number of the following sequence ?

21, 77, 165, 285, ......

A) 404	B) 415
C) 426	D) 437

Answer & Explanation Answer: D) 437

Explanation:

The series follow the rule,

21 = $5^{2}-4$
77 = $9^{2} - 4$
165 = $13^{2} - 4$
285 = $17^{2} - 4$

5,9,13,17,21,(+4)...
In the same way next no. will be
$21^{2} - 4$ = 441 - 4 = 437

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Filed Under: Number Series
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50 98835

Q:

Find the wrong number in the series.

3, 8, 15, 24, 34, 48, 63

A) 15	B) 24
C) 34	D) 48

Answer & Explanation Answer: C) 34

Explanation:

The difference between consecutive numbers of the given series are respectively 5, 7, 9, 11, 13, and 15.

Therefore, 24+11=35 But in your problem it is given as 34.so 34 is wrong number

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Filed Under: Number Series

364 98819

Q:

Fill in the blanks with the appropriate words.

Countries which _________ still undergoing the economic processes
_________ known as developing countries.

A) are, are	B) are, is
C) is, are	D) were, are

Answer & Explanation Answer: A) are, are

Explanation:

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Filed Under: Analogy
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25 98170

Q:

Select the related number from the given alternatives.

236 : 472 :: 123 : ?

A) 246	B) 426
C) 642	D) 247

Answer & Explanation Answer: A) 246

Explanation:

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Filed Under: Analogy
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1 96674

Q:

What should come in place of question mark (?) in the following question?

600 + 300 ÷ 15 = ? × 31

A) 18	B) 25
C) 40	D) 20

Answer & Explanation Answer: D) 20

Explanation:

As per the BODMAS rule, Addition and subtraction can be treated on same priority (from left to right) when they are in consecutive order. 600 + (300/15) = ? × 31 600 + 20 = ? × 31 ? = 620/31 = 20

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Filed Under: Number Series

4 95998

Q:

Complete the Analogy?

Grain : Stock :: Stick : ?

A) Bundle	B) String
C) Collection	D) Heap

Answer & Explanation Answer: A) Bundle

Explanation:

Here the relation between the given words is that the second word is the collection of the first word.

As the collection of grains is called Stock, similarly, the collection of sticks is called as Bundle.

Hence, Grain : Stock :: Stick : Bundle.

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Filed Under: Analogy
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17 95653

Q:

In a certain code language, 'dom put ta' means 'bring hot food';

'put tir sop' means 'food is good' and

'tak da sop' means 'good bright boy'.

Which of the following does mean 'hot' in that language ?

A) dom	B) pul
C) ta	D) Can't be determined

Answer & Explanation Answer: D) Can't be determined

Explanation:

Justification:

We can find the code for 'food' form the first and second statements.
Now, to find the code for 'hot',
we need to the code for 'bring' which cannot be determined from the given information.

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Filed Under: Coding and Decoding

59 95589

Q:

If South-East becomes North, North-East becomes West and so on. What will West become?

A) North-East	B) North-West
C) South-East	D) South-West

Answer & Explanation Answer: C) South-East

Explanation:

It is clear from the diagrams that new name of West will become South-East.

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Filed Under: Direction Sense Test

1592 94474

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