2 2 9 0 3 9

# MENTAL ABILITY SET 4 SOLVED 5 QUESTIONS

Q.1 Which one will replace the question mark ?

A) 12

B) 13

C) 11

D) 10

Ans. C

Explanation:
(4 x 8) + 1 = 33
(5 x 9) + 1 = 46
Similarly, (7 x x) + 1 = 78
Or x=11

Q.2

Find the number of triangles in the given figure.

A) 18

B) 20

C) 24

D) 27

Ans. C

Explanation:

The figure may be labelled as shown.

The simplest triangles are IJO, BCJ, CDK, KQL, MLQ, GFM, GHN and NIO i.e. 8 in number.
The triangles composed of two components each are ABO, AHO, NIJ, IGP, ICP, DEQ, FEQ, KLM, LCP and LGP i.e.10 in number.
The triangles composed of four components each are HAB, DEF, LGI, GIC, ICL and GLC i.e. 6 in number.
Total number of triangles in the figure = 8 + 10 + 6 = 24

Q.3 Find out how will the key figure (X) look like after rotation.

A) 1

B) 2

C) 4

D) 3

Ans. B

Q.4 Observe the dots on the dice (one to six dots) in the following figures. How many dots are contained on the face opposite to the containing four dots?

A) 2
B) 3
C) 6
D) 5
Ans. A

Q.5 Which one will replace the question mark ?

A) 1
B) 4
C) 3
D) 6
Ans. D
(5 + 4 + 7)/2 = 8
(6 + 9 + 5)/2 = 10
(3 + 7 + 2)/2 = 6.