Aptitude and Reasoning Questions

Q:

A girl facing north rotates 100(degree) clockwise then 190(degree) anticlockwise. what is new direction of the girl ?

A) North-East B) West
C) South-East D) South
 
Answer & Explanation Answer: B) West

Explanation:

First girl facing North
Then she rotates 100 deg clock wise => 10 deg ES
Then again she rotates 190 deg anti clock wise => for 100 deg it is North and more 90 deg means West.
Therefore, the new direction of the girl is West.

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Filed Under: Direction Sense Test
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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative 

Assertion (A) : Silver is not used to make electric wires. 

Reason (R)   :  Silver is a bad conductor. 

A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false. D) A is false but R is true.
 
Answer & Explanation Answer: C) A is true but R is false.

Explanation:

Silver is a good conductor of electricity but it is not used to make electric wires because it is expensive 

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Filed Under: Assertion and Reason

10 14924
Q:

Some children goto ice-cream shop. 9 flavours are available there. Each child takes a cone with two different flavours. No two children take same combination and they have taken all such possible combinations. How many children went to ice cream shop ?

A) 28 B) 56
C) 44 D) 36
 
Answer & Explanation Answer: D) 36

Explanation:

Given there are 9 flavours of ice creams.

 

Each child takes the combination of two flavours and no two children will have the same combination

 

This can be done by  ways i.e children.

 

Number of children=C29  = 9 x 8 / 1x 2 = 36.

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Filed Under: Permutations and Combinations
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4 14923
Q:

The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is :

A) 15 B) 20
C) 21 D) data inadequate
 
Answer & Explanation Answer: D) data inadequate

Explanation:

 Clearly, to find the average, we ought to know the number of boys, girls or students in the class, neither of which has been given.

So, the data provided is inadequate.

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Filed Under: Average

18 14921
Q:

Choose the correct figure that replaces the question mark.

 

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

Explanation:
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Filed Under: Image Analysis
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Q:

A is three times as old as B. C was twice-as old as A four years ago. In four years' time, A will be 31. What are the present ages of B and C ?

A) 45, 10 B) 10, 50
C) 9, 50 D) 50, 15
 
Answer & Explanation Answer: C) 9, 50

Explanation:

Let the age of A = A, B = B and C = C

From given

A = 3B

4 years ago,

C-4 = 2(A-4);

After 4 years

A + 4 = 31;

A = 27;
sub in above B, we get B = 9
C = 2(27 - 4) + 4 = 46 + 4 = 50

Hence B = 9yrs and C = 50yrs.

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Filed Under: Problems on Ages
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16 14913
Q:

Gaurav ranks eighteenth in a class. What is his rank from the last ? 

I. There are 47 students in the class. 

II. Jatin who ranks 10th in the same class, ranks 38th from the last. 

A) If the data in statement I alone are sufficient to answer the question B) If the data in statement II alone are sufficient answer the question
C) If the data either in I or II alone are sufficient to answer the question; D) If the data even in both the statements together are not sufficient to answer the question
 
Answer & Explanation Answer: C) If the data either in I or II alone are sufficient to answer the question;

Explanation:

To find the rank from other end, we need to know the total number of students in the class. So. I is sufficient. Also: from II, we can conclude that there are (10 + 38- 1 = 47) students in the class.

So. II alone is also sufficient. 

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Filed Under: Data Sufficiency

4 14912
Q:

Two cones have their heights in the ratio 1:3 and the radii of their bases in the ratio 3:1. Find the ratio of their volumes.

A) 3:1 B) 2:1
C) 4:1 D) 5:1
 
Answer & Explanation Answer: A) 3:1

Explanation:

v1v2=r12Hr22H

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Filed Under: Volume and Surface Area
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