Logical Deduction problems
- 1. Only romantic boys give roses to girls.
(i) Ashok is romance.
(ii) Ashok gave roses to a girl.
(iii) Ashok did not give roses to a girl.
(iv) Ashok is a romantic boy.
Options- A. (ii) (iv)
- B. (i) (ii)
- C. (i) (iii)
- D. (ii) (i) Discuss
Correct Answer: (ii) (iv)
Explanation:
The statement has the logical connective 'only' and this does not imply that all romantic boys will give roses to girls but if a boy has given a rose to a girl, he must be romantic.
- 2. If you propose to the government, it will relent.
(i) Amit proposed to the government.
(ii) Amit relented.
(iii) Government relented.
(iv) Government did not relent.
Options- A. (i) (iii)
- B. (iii) (i)
- C. (iv) (ii)
- D. (ii) (iv) Discuss
Correct Answer: (i) (iii)
Explanation:
The statement is of the type: if A then B.
- 3. All that flows have viscosity .
(i) it flows.
(ii) It does not flow.
(iii) it has viscosity.
(iv) It does not have viscosity.
Options- A. (iii) (i)
- B. (iv) (ii)
- C. Both (i) and (ii)
- D. None Discuss
Correct Answer: (iv) (ii)
Explanation:
The statement is of the type: if A (it flows) then B (have viscosity).
- 4. If it happens on Sunday, it will happen again on Tuesday.
(i) it happened on Sunday.
(ii) it happened on Tuesday.
(iii) it did not happen on Sunday.
(iv) it did not happen on Tuesday.
Options- A. (iii) (ii)
- B. (iv) (iii)
- C. (ii) (i)
- D. (iii) (iv) Discuss
Correct Answer: (iv) (iii)
Explanation:
The statement is of the type: if A (happens on Sunday) then B (happen again on Tuesday).
- 5. Whenever Shashi makes coffee, Asha puts in sugar.
(i) Shashi makes coffee.
(ii) Asha makes coffee.
(iii) Shashi puts in sugar.
(iv) Asha puts in sugar.
Options- A. (iv) (i)
- B. (i) (iv)
- C. (ii) (iii)
- D. (iii) (ii) Discuss
Correct Answer: (i) (iv)
Explanation:
The statement is of the type: when A (Shashi makes coffee) then B (Asha puts sugar in it).
- 6. Sperman exits from the window, when Batman enters from the door.
(i) Superman exits from the window.
(ii) Batman enters from the door.
(iii) Superman does not exit from the window.
(iv) Batman does not enter from the door.
Options- A. (iii) (iv)
- B. (iv) (iii)
- C. (i) (ii)
- D. None Discuss
Correct Answer: (iv) (iii)
Explanation:
The statement is of the type: when A (Batman enters from the door) then B (Superman exits from the window).
- 7. Anu drinks tea only when Dolly eats samosa.
(i) Dolly ate samosa.
(ii) Anu drank tea.
(iii) Anu did not drink tea.
(iv) Dolly did not eat samosa.
Options- A. (i) (ii)
- B. (ii) (i)
- C. (iii) (ii)
- D. (ii) (iv) Discuss
Correct Answer: (ii) (i)
Explanation:
The statement is of the type: only when A (Dolly eats samosa) then B (Anu drink tea). But it does not imply that whenever Dolly eats samosa, Anu will drink tea.
- 8. When clouds go high, they rain hail.
(i) Clouds went high.
(ii) it is raining hail.
(iii) Clouds went low.
(iv) it is not raining hail.
Options- A. (ii) (i)
- B. (iii) (ii)
- C. (iv) (i)
- D. (i) (ii) Discuss
Correct Answer: (i) (ii)
Explanation:
The statement is of the type: when A (clouds go high) then B (they rain hail).
- 9. Mango rots when it is ripe.
(i) Mango is ripe.
(ii) Mango is not ripe.
(iii) Mango rots.
(iv) Mango does not rot.
Options- A. (iv) (ii)
- B. (ii) (iv)
- C. (ii) (iii)
- D. (iii) (i) Discuss
Correct Answer: (iv) (ii)
Explanation:
The statement is of the type : when A (it is ripe) then B (mango rots).
- 10. Only the hardy can climb Mount Sagarmatha.
(i) Santosh climbed Sagarmatha.
(ii) Santosh did not climb Sagarmatha.
(iii) Santosh is hardy.
(iv) Santosh may be hardy
Options- A. (i) (iv)
- B. (i) (iii)
- C. (iii) (i)
- D. (ii) (iv) Discuss
Correct Answer: (i) (iii)
Explanation:
The statement does not imply that all hardy can climb Mount Sagarmatha, but whoever does is surely hardy.
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