Class 8 practice
Class 8 reasoning questions.
Reasoning questions for Class 8, at the level of students aged 12–14, each with its answer and a short explanation. Try each one before opening the answer.
Consider these statements: All metals are good conductors of heat. Copper is a metal. Which conclusion logically follows from these statements?
Level 3 of 5Show the answer
Answer: Copper is a good conductor of heat.
Since copper belongs to the category of metals, it must possess the defining property shared by all metals in the premise: conducting heat well.
In a class of 40 students, 25 play cricket and 20 play football. Every student plays at least one of these two games. How many students play both cricket and football?
Level 3 of 5Show the answer
Answer: 5
Using the set formula, Total = Cricket + Football - Both. Substituting the values gives 40 = 25 + 20 - Both, which means Both = 45 - 40 = 5 students.
A solid cube painted red on all outer faces is cut into 27 identical small cubes. How many small cubes have paint on exactly two faces?
Level 3 of 5Show the answer
Answer: 12
On a 3×3×3 cube, pieces with paint on two faces sit on the middle edges. With 12 edges, there are 12 such cubes.
On a balance scale, two identical clay pots balance three identical brass bowls. How many brass bowls are needed to balance six clay pots?
Level 3 of 5Show the answer
Answer: 9
Two pots equal three bowls. Tripling both sides, six pots equal nine bowls.
Manpreet walks 12 metres north from her doorstep. She turns left and walks 5 metres straight. What is the shortest distance between Manpreet and her doorstep?
Level 3 of 5Show the answer
Answer: 13 metres
By Pythagoras' theorem, the straight-line distance is √(12² + 5²) = √(144 + 25) = √169 = 13 metres.
Five friends—Aarav, Diya, Farhan, Jasleen, and Kavya—stand in a line. Jasleen is directly ahead of Kavya. Farhan is between Aarav and Jasleen. Diya is first in line. Who stands directly behind Farhan?
Level 3 of 5Show the answer
Answer: Jasleen
Diya is first. Since Jasleen is directly ahead of Kavya, they form a block. To place Farhan between Aarav and Jasleen, the order must be Diya, Aarav, Farhan, Jasleen, Kavya. Thus, Jasleen is directly behind Farhan.
Look at the sequence: 3, 7, 16, 35, 74. Which number should come next?
Level 3 of 5Show the answer
Answer: 153
Each term is found by doubling the previous term and adding consecutive integers: 3×2+1=7, 7×2+2=16, 16×2+3=35, 35×2+4=74, and 74×2+5=153.
Kavita walks 20 metres north. She turns right and walks 15 metres. Then she turns right again and walks 20 metres. In which direction is she from her starting point?
Level 3 of 5Show the answer
Answer: East
Moving north and south by the same distance cancels out vertical movement. She remains 15 metres east of her starting point.
Choose the pair that shares the same relationship as the given pair: Pen : Write :: Scissors : ___.
Level 3 of 5Show the answer
Answer: Cut
A pen is a tool primarily used to write, just as scissors are a tool primarily used to cut.
A clock shows 3:00. What is the smaller angle between the hour hand and the minute hand?
Level 3 of 5Show the answer
Answer: 90 degrees
Each hour mark on a clock represents 30 degrees. At 3:00, the hands are 3 marks apart: 3 times 30 equals 90 degrees.
If 1st October in a standard year falls on a Sunday, on which day of the week will 1st November fall in the same year?
Level 3 of 5Show the answer
Answer: Wednesday
October has 31 days. Dividing 31 by 7 gives 4 weeks with a remainder of 3 odd days. Sunday plus 3 days is Wednesday.
Priya starts walking from her school gate. She walks 40 metres south, turns left, and walks 30 metres. What is the shortest straight-line distance from Priya to the gate?
Level 3 of 5Show the answer
Answer: 50 metres
The path forms a right-angled triangle with legs 40 m and 30 m. Using the Pythagorean theorem, the distance is √(40² + 30²) = √(2500) = 50 metres.
- True or false?
The logical negation of the statement 'All students passed the exam' is 'No student passed the exam.'
Level 3 of 5Show the answer
Answer: False
The opposite of 'all' is not 'none'. The correct logical negation is 'at least one student did not pass the exam.'
- True or false?
In a race, Priya finished ahead of Ananya, and Deepa finished behind Priya. This proves that Ananya finished ahead of Deepa.
Level 3 of 5Show the answer
Answer: False
Both runners finished behind Priya, but the information does not tell us who crossed the finish line first between Ananya and Deepa.
- True or false?
In a group of five friends, it is mathematically possible for each person to shake hands with exactly three others.
Level 3 of 5Show the answer
Answer: False
Five people with three handshakes each would total fifteen handshakes. Since every handshake involves two people, the total sum must be even.
- Fill in the blank.
In a class of 30 pupils, 18 play cricket, 16 play football, and 4 play neither, so ___ pupils play both.
Level 3 of 5Show the answer
Answer: 8
Exactly 26 pupils play at least one sport (30 - 4). The overlap of both sports equals (18 + 16) - 26 = 8 pupils.
- Fill in the blank.
In the increasing number sequence 3, 7, 15, 31, the next number is ___.
Level 3 of 5Show the answer
Answer: 63
Each term is obtained by doubling the previous number and adding 1, so 31 × 2 + 1 = 63.
- Fill in the blank.
If four chess players in a tournament each play exactly one match against every other player, the total number of matches is ___.
Level 3 of 5Show the answer
Answer: 6
Each of the 4 players faces 3 opponents, giving 4 × 3 = 12 pairings. Dividing by 2 to prevent double-counting yields 6 matches.
Four two-digit numbers are listed below. Which is the odd one out?
Level 3 of 5Show the answer
Answer: 57
57 is the odd one out. The numbers 17, 37, and 47 are all prime numbers, whereas 57 is composite because it is divisible by 3 and 19.
Which measurement unit is the odd one out?
Level 3 of 5Show the answer
Answer: Watt
Joule, calorie, and erg are all units of energy and heat. Watt is a unit of power, representing energy consumed per unit time.
These questions come from Ado’s question bank and are written with AI help. They are never used in ranked play, so practising them here can’t change anyone’s rank.
Spot a mistake? Tell us at hi@getado.app and we’ll fix it.
Last updated:
Reasoning for other classes
Other subjects for Class 8
Olympiads for Class 8 · Reasoning olympiad prep
A new set every morning
Ado’s daily brings fresh questions at this level every day, ranked only against students the same age. The Ado Rank it builds never resets.
For parents of students aged 6–17. Free to start, free to rank.