Aptitude and Reasoning Questions

Q:

If 3x= 4y= 12, then z is equal to

A) xy B) x + y
C) xy/x+Y D) 4x +3y
 
Answer & Explanation Answer: C) xy/x+Y

Explanation:
Taking log of all 3 we get
xln3 = yln4 =
zln12 = k
z = k/ln12 = k / ln(
3*4) = k/ln3 + ln4 = k / (k/x +k/y) = xy / (x+y)
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Filed Under: Simplification
Exam Prep: Bank Exams

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Q:

The standard deviation of the set {10, 11, 9, 11, 9} is

A) 1/√5 B) 2/√5
C) 3/√5 D) 0
 
Answer & Explanation Answer: B) 2/√5

Explanation:
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Filed Under: Simplification
Exam Prep: Bank Exams

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Q:

A right prism has a square base with side of base 4 cm and the height of prism is 9 cm. The prism is cut in three parts of equal heights by two planes parallel to its base. What is the ratio of the volume of the top, middle and the bottom part respectively?

A) 1 : 8 : 27 B) 1 : 7 : 19
C) 1 : 8 : 20 D) no answer
 
Answer & Explanation Answer: D) no answer

Explanation:
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Filed Under: Volume and Surface Area
Exam Prep: Bank Exams

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Q:

In the given figure, PQR is a quadrant whose radius is 7 cm. A circle is inscribed in the quadrant as shown in the figure. What is the area (in sq.cm) of the circle?

 

A) 385 – 221√2 B) 308 – 154√2
C) 154 – 77√2 D) 462 – 308√2
 
Answer & Explanation Answer: D) 462 – 308√2

Explanation:
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Filed Under: Area
Exam Prep: Bank Exams

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Q:

If the product of two numbers is 3026 and their LCM is 89, then their HCF is :

A) 33 B) 34
C) 35 D) 29
 
Answer & Explanation Answer: B) 34

Explanation:
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Filed Under: HCF and LCM
Exam Prep: Bank Exams

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Q:

Group the given figures into three classes using each figure only once.

A) 2,4,7 ; 1,8,9 ; 3,5,6 B) 2,6,9 ; 1,5,7 ; 3,4,8
C) 2,6,7 ; 1,5,8 ; 3,4,9 D) 2,8,7 ; 1,5,9 ; 3,4,6
 
Answer & Explanation Answer: B) 2,6,9 ; 1,5,7 ; 3,4,8

Explanation:

1,5,7 contain a rectangle with its two diagonals as the outer element and another element (similar or different) placed inside it.

2,6,9 contain a triangle with its three medians as the outer element and another element (similar or different) placed inside it.

3,4,8 contain a circle with its two mutually perpendicular diameters as the outer element and another element (similar or different) placed inside it.

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Filed Under: Grouping of Images

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Q:

If 70% of total articles are sold at a profit of 20% and remaining articles are sold at a loss of 20%, then what will be the overall profit percentage?

A) 8 B) 12
C) 16 D) 6
 
Answer & Explanation Answer: A) 8

Explanation:
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Filed Under: Profit and Loss
Exam Prep: Bank Exams

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Q:

A shopkeeper buys a product of Rs 150 per Kg. 15% of product was damaged. At what price (per Kg) should he sell the remaining so as to earn a profit of 20%?

A) Rs. 207 B) Rs. 207 11/180
C) Rs. 211 13/17 D) Rs. 204 7/13
 
Answer & Explanation Answer: C) Rs. 211 13/17

Explanation:
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Filed Under: Profit and Loss
Exam Prep: Bank Exams

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