Find the odd one out: 3, 5, 7, 9, 11 MCQ with Answer and Explanation

Find the odd one out: 3, 5, 7, 9, 11
A. 9
B. 11
C. 3
D. 5
Answer: Option A
Solution (By JKSSB Mock Tests)
All others are prime numbers; 9 is a composite number.

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Practice More Mental Reasoning Questions

Question #1
A person walks 10 m east, turns left and walks 5 m, then turns left and walks 10 m. How far is he from the starting point?
A. 15 m
B. 20 m
C. 5 m
D. 10 m

Correct Answer: Option C


Explanation:
He goes 10 m east, then 5 m north, then 10 m west. He is now 5 m north of the starting point.

This question belongs to: Reasoning Mental Reasoning
Question #2
If FROG is coded as GORF, how is LION coded?
A. ONIL
B. NOLI
C. NILO
D. NOIL

Correct Answer: Option D


Explanation:
The word is written in reverse order. LION reversed is NOIL.

This question belongs to: Reasoning Mental Reasoning
Question #3
If in a certain code, '345' means 'you are good', '358' means 'good is nice' and '783' means 'nice and good', then which digit stands for 'is'?
A. 8
B. 3
C. 7
D. 5

Correct Answer: Option A


Explanation:
From first two, good =3 or 5. From second and third, good =3 or 8. Common good =3. Then from second, remaining for 'is' and 'nice' are 5 and 8. From third, nice and and are 7 and 8 (since good=3). Common for nice is 8. Thus from second, 'is' =5. Wait, then answer B. From above: second 358 = good is nice, good=3, so is and nice =5,8. Third 783 = nice and good, good=3, so nice and =7,8. Thus nice =8, then is =5, and =7. Yes, 'is' =5.

This question belongs to: Reasoning Mental Reasoning