Free Critical Thinking MCQs with Answers
435 Critical Thinking MCQs from Analytical and Logical Reasoning, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Critical thinking examines how conclusions follow from evidence, including claims, assumptions, arguments, inferences and relevant facts. Questions ask you to identify hidden assumptions, distinguish strong from weak evidence, assess cause and effect, recognise common reasoning errors, and decide which statement strengthens or weakens an argument.
Last updated
Read the Critical Thinking notesFree MDCAT chapter notes with key terms435 questions · page 20 of 22
- A. 6
- B. 15
- C. 35
- D. 21
Explanation: 6 equals 2 times 3, 15 equals 3 times 5, and 35 equals 5 times 7. Although 21 is a product of primes, 3 and 7 are not consecutive primes.
Correct answer: 21- A. 12
- B. 18
- C. 20
- D. 27
Explanation: The numbers 12, 18, and 20 each have exactly six positive factors. The factors of 27 are 1, 3, 9, and 27, so it has only four.
Correct answer: 27- A. 6
- B. 28
- C. 496
- D. 12
Explanation: A perfect number equals the sum of its proper positive factors. 6, 28, and 496 have this property, while 12 does not.
Correct answer: 12- A. 3
- B. 5
- C. 11
- D. 13
Explanation: 3 is the second prime, 5 is the third, and 11 is the fifth, so each has a prime position. 13 is the sixth prime, and 6 is not prime.
Correct answer: 13- A. Rain
- B. Fog
- C. Wind
- D. Pencil
Explanation: Rain, fog and wind are all types of weather. Pencil is an object, not a weather condition.
Correct answer: Pencil- A. Violin
- B. Flute
- C. Trumpet
- D. Leopard
Explanation: Violin, flute and trumpet are musical instruments. Leopard is an animal, so it is the odd one out.
Correct answer: Leopard- A. 12
- B. 20
- C. 28
- D. 34
Explanation: 12, 20 and 28 are each divisible by 4. Dividing 34 by 4 leaves a remainder, so 34 is different.
Correct answer: 34388. Three numbers have their digits in increasing order from left to right. Which number is different?
- A. 135
- B. 246
- C. 357
- D. 864
Explanation: The digits of 135, 246 and 357 increase from left to right. The digits of 864 decrease, so it does not fit.
Correct answer: 864- A. Knife
- B. Knee
- C. Know
- D. Cloud
Explanation: The first k is silent in knife, knee and know. The c in cloud is pronounced, making cloud the odd one out.
Correct answer: Cloud- A. 14
- B. 32
- C. 50
- D. 27
Explanation: 14, 32 and 50 are even, and their digit sums are 5, 5 and 5, which are odd. Although 27 has an odd digit sum, it is not even.
Correct answer: 27- A. 24
- B. 42
- C. 66
- D. 57
Explanation: 24, 42 and 66 are divisible by 3, and their tens digits are even. The tens digit of 57 is odd, so 57 breaks the combined rule.
Correct answer: 57- A. Chair
- B. Green
- C. Sound
- D. Plant
Explanation: Chair, green and sound each have five letters, two vowels, and consonants as their first and last letters.
Correct answer: Plant- A. 47
- B. 61
- C. 83
- D. 57
Explanation: 47, 61 and 83 are prime, and each contains an even digit, giving an even digit product. 57 is not prime, and its digit product is odd.
Correct answer: 57- A. Shirt
- B. Jacket
- C. Trousers
- D. Spoon
Explanation: Shirt, jacket, and trousers are all types of clothing. A spoon is a kitchen utensil, so it is the different item.
Correct answer: Spoon- A. 12
- B. 21
- C. 30
- D. 40
Explanation: The first three numbers increase by 9 each time: 12, 21, 30. The next number in that pattern would be 39, not 40.
Correct answer: 40- A. Apple
- B. Mango
- C. Banana
- D. Carrot
Explanation: Apple, mango and banana are commonly classified as fruits. Carrot is a root vegetable, so it is the odd word.
Correct answer: Carrot- A. Apple
- B. Mango
- C. Banana
- D. Carrot
Explanation: Apple, mango and banana are fruits. Carrot is a vegetable, so it is the odd word.
Correct answer: Carrot- A. Hammer
- B. Saw
- C. Pliers
- D. Violin
Explanation: A hammer, saw and pliers are tools used for practical work. A violin is a musical instrument.
Correct answer: Violin- A. Triangle
- B. Square
- C. Circle
- D. Cylinder
Explanation: A triangle, square and circle are flat, two-dimensional shapes. A cylinder is a three-dimensional solid.
Correct answer: Cylinder- A. Metre
- B. Inch
- C. Litre
- D. Yard
Explanation: Metre, inch and yard measure length or distance. A litre measures volume, not length.
Correct answer: Litre