All Free Analytical and Logical Reasoning MCQs with Answers

1. Complete the series: 2, 6, 12, 20, 30, ?

• A. 36
• B. 40
• C. 42
• D. 46

Explanation: The differences between consecutive terms are 4, 6, 8, 10 — increasing by 2 each time. The next difference is 12, so the missing term is 30 + 12 = 42.

2. A is the brother of B, B is the sister of C, and C is the father of D. How is A related to D?

• A. Father
• B. Brother
• C. Uncle
• D. Cousin

Explanation: A and B are siblings, and B and C are siblings, so A and C are also siblings. Since C is D’s father, A is D’s paternal uncle.

3. If CAT is coded as DBU, then DOG is coded as:

• A. EPH
• B. EPG
• C. DPH
• D. FQI

Explanation: Each letter moves forward one position in the alphabet: C→D, A→B, T→U. Applying the same rule to DOG gives D→E, O→P, G→H, which is EPH.

4. Find the next number in the series: 3, 6, 12, 24, ?

• A. 30
• B. 36
• C. 48
• D. 60

Explanation: Each term is double the one before it, so the next term is 24 times 2, which is 48. Checking a series for a constant ratio before looking for a constant difference saves time, since a rapidly growing series is almost always multiplicative. The answer 30 comes from assuming a difference of 6.

5. Find the next number in the series: 2, 5, 10, 17, 26, ?

• A. 35
• B. 37
• C. 39
• D. 41

Explanation: The differences are 3, 5, 7 and 9, rising by 2 each time, so the next difference is 11 and the next term is 26 plus 11, which is 37. The same series can be read as n squared plus 1 for n equal to 1, 2, 3 and so on, which gives 36 plus 1 for the sixth term. When first differences are not constant, always take the second differences.

6. Complete the letter series: A, C, F, J, ?

• A. M
• B. N
• C. O
• D. P

Explanation: The gaps between the letters grow by one each step: A to C skips one letter, C to F skips two, F to J skips three, so the next step skips four and lands on O. Writing the alphabet with position numbers turns this into the numeric series 1, 3, 6, 10, 15, which is the triangular numbers. The answer M comes from assuming a constant gap of three.

7. If all surgeons are doctors and some doctors are researchers, which conclusion definitely follows?

• A. All surgeons are researchers
• B. Some surgeons are researchers
• C. All researchers are doctors
• D. No conclusion about surgeons and researchers definitely follows

Explanation: The researchers who are doctors might all be non-surgeons, so nothing definite links surgeons to researchers. A conclusion is only valid if it holds in every arrangement the premises allow, not merely in the most natural looking one. The third option reverses the second premise, which said only that some doctors are researchers.

8. Pointing to a photograph, a man said, "She is the daughter of my grandfather's only son." How is the woman related to him?

• A. His mother
• B. His sister
• C. His aunt
• D. His niece

Explanation: The grandfather's only son must be the speaker's own father, so the woman is his father's daughter, which makes her his sister. The chain is easiest to follow by resolving the innermost phrase first and working outwards. Answering aunt comes from treating the grandfather's only son as an uncle, which the word only rules out.

9. In a certain code, MEDICAL is written as NFEJDBM. How is HEART written in that code?

• A. IFBSU
• B. IFBTU
• C. GDZQS
• D. IEBSU

Explanation: Each letter is replaced by the one immediately after it in the alphabet, so M becomes N, E becomes F and so on. Applying the same shift to HEART gives I, F, B, S and U, which is IFBSU. Option IFBTU shifts the R correctly but moves the T two places instead of one.

10. A hospital reports a sharp rise in dengue admissions during August. Which is the most appropriate immediate course of action?

• A. Close the hospital until the season ends
• B. Launch a mosquito control and public awareness drive in the affected areas
• C. Refuse admission to further dengue patients
• D. Wait for the figures of the following year before acting

Explanation: A course of action is appropriate when it is practical, proportionate and addresses the cause rather than the symptom, and mosquito control targets the source of transmission directly. Closing the hospital or refusing admissions would worsen the harm the action is meant to reduce. Waiting a year fails the test of urgency that this question type is built around.