alleryA deductive argument that is valid and has true premises is called what?
- Sound
- Ampliative
- Fallacious
- Contingent
Show answer and solution
Correct answer: A. Sound
Soundness combines logical validity with factually true premises.
RRB NTPC Statement and Conclusion — practice questions
Explore 24 free Statement and Conclusion questions in RRB NTPC General Intelligence and Reasoning. Open each question or exercise to read its content, reference answers and available explanation.
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A deductive argument that is valid and has true premises is called what?Read the answer and worked solution →Can a valid argument have a false premise?Read the answer and worked solution →All mammals are warm-blooded. Whales are mammals. Conclusion?Read the answer and worked solution →Statement: If a shape is a square, it has 4 equal sides. Shape S does not have 4 equal sides. Conclusion?Read the answer and worked solution →Statement: Everyone who exercises regularly has good stamina. Arjun exercises regularly. Conclusion?Read the answer and worked solution →Statement: Some birds cannot fly. A penguin is a bird that cannot fly. What follows?Read the answer and worked solution →Statement: Every voter must be at least 18 years old. Rohan voted in the election. Conclusion?Read the answer and worked solution →Statement: No reptiles have feathers. Snakes are reptiles. Which conclusion follows?Read the answer and worked solution →Statement: All metals expand when heated. Iron is a metal and is heated. Conclusion?Read the answer and worked solution →Only members enter library. Mohan entered. Conclusion?Read the answer and worked solution →Acute angles are < 90 degrees. Angle A is 45 degrees. Conclusion?Read the answer and worked solution →Statement: A prime number has exactly two factors. Number 9 has three factors (1, 3, 9). Conclusion?Read the answer and worked solution →Statement: X is taller than Y, and Y is taller than Z. Which conclusion must be true?Read the answer and worked solution →Statement: P is older than Q, and Q is older than R. Which conclusion is definitely true?Read the answer and worked solution →Carnivores eat meat. Lions are carnivores. Conclusion?Read the answer and worked solution →Pure water boils at 100°C (1 atm). Liquid L boils at 78°C (1 atm). Conclusion?Read the answer and worked solution →Statement: All multiples of 10 end with the digit 0. Number N is a multiple of 10. Conclusion?Read the answer and worked solution →Statement: Planets in our solar system orbit the Sun. Earth is such a planet. Conclusion?Read the answer and worked solution →Objects less dense than water float. Wood is less dense than water. Conclusion?Read the answer and worked solution →Statement: Integers ending in 7 are never divisible by 2. Number 37 ends in 7. Conclusion?Read the answer and worked solution →Photosynthesis requires chlorophyll. Plant P photosynthesizes. Conclusion?Read the answer and worked solution →Statement: Speed equals Distance / Time. If Time is halved for the same distance, Speed will:Read the answer and worked solution →RRB NTPC · Argument ClassificationRead the answer and worked solution →RRB NTPC · Logical DeductionsRead the answer and worked solution →
Worked practice questions
Can a valid argument have a false premise?
- Only in maths
- Yes, it can
- No, never
- Only if sound
Show answer and solution
Correct answer: B. Yes, it can
Validity concerns only the link from premises to conclusion, not whether premises are actually true.
All mammals are warm-blooded. Whales are mammals. Conclusion?
- Whales are warm-blooded
- Whales are cold-blooded
- All animals are whales
- Whales cannot swim
Show answer and solution
Correct answer: A. Whales are warm-blooded
By universal deduction, since whales belong to the category of mammals, whales must be warm-blooded.
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