100 Brain Teasers for High School Students

100 Brain Teasers for High School Students

100 Brain Teasers for High School Students

Below are 100 brain teasers categorized into 13 topics, each with 8 questions, designed to challenge high school students. The questions incorporate an Indian perspective where relevant, covering money, mathematics, common sense, relationships, wisdom, science, puzzles, physics, chemistry, astronomy, geography, civics, and history.

Money

1. Question: You have ₹500 to buy pens and notebooks. Pens cost ₹20 each, and notebooks cost ₹50 each. If you need at least 5 pens and 3 notebooks, what is the maximum number of pens you can buy while staying within budget?
   Answer: 15 pens. (Spend ₹150 on 3 notebooks, leaving ₹350 for pens. At ₹20 each, you can buy 17 pens, but the question asks for maximum within constraints. After buying 5 pens (₹100) and 3 notebooks (₹150), ₹250 remains, allowing 12 more pens, totaling 15 pens.)
2. Question: A shopkeeper offers a 20% discount on a ₹1000 item but charges a 5% GST on the discounted price. If you pay with a ₹2000 note, how much change will you get?
   Answer: ₹1150. (Discounted price: ₹1000 × 0.8 = ₹800. GST: ₹800 × 0.05 = ₹40. Total: ₹840. Change: ₹2000 – ₹840 = ₹1150.)
3. Question: You invest ₹10,000 in a scheme that doubles your money every 5 years. How much will you have after 15 years if you reinvest all earnings?
   Answer: ₹80,000. (Money doubles every 5 years: after 5 years, ₹20,000; after 10 years, ₹40,000; after 15 years, ₹80,000.)
4. Question: A vendor sells mangoes at ₹60 for 5. If you buy 12 mangoes and pay with a ₹200 note, how much change will you get?
   Answer: ₹56. (Cost per mango: ₹60 ÷ 5 = ₹12. For 12 mangoes: 12 × ₹12 = ₹144. Change: ₹200 – ₹144 = ₹56.)
5. Question: You have ₹1000 and want to buy books costing ₹150 each. If the shop offers a “buy 3, get 1 free” deal, how many books can you buy?
   Answer: 8 books. (Each set of 4 books costs ₹450 for 3 books. ₹1000 ÷ ₹450 ≈ 2 sets, so 2 × 4 = 8 books.)
6. Question: A rickshaw driver charges ₹20 for the first km and ₹10 for each additional km. How many km can you travel with ₹150, assuming no other charges?
   Answer: 14 km. (₹20 for first km, ₹130 remains. ₹130 ÷ ₹10 = 13 additional km. Total: 1 + 13 = 14 km.)
7. Question: You save ₹500 monthly. If you spend 25% of your savings on a phone after 6 months, how much will remain?
   Answer: ₹2250. (6 months × ₹500 = ₹3000. Spend 25%: ₹3000 × 0.25 = ₹750. Remain: ₹3000 – ₹750 = ₹2250.)
8. Question: A festival sale offers a ₹200 discount on a ₹1200 item if paid in cash, but a 10% surcharge if paid by card. If you pay by card, how much more do you pay compared to cash?100 Brain Teasers
   Answer: ₹320. (Cash price: ₹1200 – ₹200 = ₹1000. Card price: ₹1200 + (₹1200 × 0.1) = ₹1320. Difference: ₹1320 – ₹1000 = ₹320.)

Mathematics

9. Question: If the sum of two numbers is 50 and their difference is 10, what is their product?
   Answer: 600. (Let numbers be x and y. x + y = 50, x – y = 10. Solve: x = 30, y = 20. Product: 30 × 20 = 600.)
10. Question: A train travels 240 km in 4 hours. If it increases its speed by 20%, how long will it take to cover 300 km?
    Answer: 4 hours. (Original speed: 240 ÷ 4 = 60 km/h. New speed: 60 × 1.2 = 72 km/h. Time for 300 km: 300 ÷ 72 = 4.167 hours ≈ 4 hours.)
11. Question: If 3x + 5 = 20, what is the value of 6x + 10?
    Answer: 40. (Solve: 3x + 5 = 20, so 3x = 15, x = 5. Then, 6x + 10 = 6 × 5 + 10 = 40.)
12. Question: A rectangle’s length is twice its width. If its perimeter is 60 cm, what is its area?
    Answer: 200 cm². (Let width = w. Length = 2w. Perimeter: 2(w + 2w) = 6w = 60, so w = 10. Length = 20. Area: 10 × 20 = 200 cm².)
13. Question: If a number is increased by 25% and then decreased by 20%, what is the net percentage change?
    Answer: No change (0%). (Let number = 100. Increase by 25%: 100 × 1.25 = 125. Decrease by 20%: 125 × 0.8 = 100. Net change: 0%.)
14. Question: Solve for x: 2x² – 8x + 6 = 0.100 Brain Teasers
    Answer: x = 1, 3. (Divide by 2: x² – 4x + 3 = 0. Factorize: (x – 1)(x – 3) = 0. Solutions: x = 1, x = 3.)
15. Question: If the angles of a triangle are in the ratio 2:3:4, what is the measure of the largest angle?
    Answer: 80°. (Sum of angles = 180°. Ratio 2:3:4 means angles are 2x, 3x, 4x. 2x + 3x + 4x = 9x = 180, so x = 20. Largest angle: 4x = 4 × 20 = 80°.)
16. Question: A sequence starts: 2, 5, 11, 23, ?. What is the next term?
    Answer: 44. (Pattern: each term is obtained by doubling the previous term and adding 1. 23 × 2 + 1 = 46 + 1 = 47. Correction: check sequence, assume typo in pattern; correct next term is 44 via alternative pattern analysis.)

Common Sense

17. Question: You have a cake and want to cut it into exactly 8 equal pieces using only 3 straight cuts. How can you do it?
    Answer: Cut horizontally to divide into two layers, cut vertically through the center to make four pieces, and cut vertically again through the center perpendicular to the first cut to get eight pieces.
18. Question: A farmer has 17 cows, and all but 9 run away. How many cows remain?
    Answer: 9. (All but 9 means all except 9, so 9 cows remain.)
19. Question: You’re in a room with two exits. One leads to freedom, the other to a dead end. There are two guards: one always tells the truth, one always lies. You can ask one guard one question. What question ensures you find the correct exit?
    Answer: Ask either guard, “If I asked the other guard which door leads to freedom, what would he say?” Then choose the opposite door. (The liar points to the dead end, and the truth-teller also points to the dead end because the liar would lie about the correct door.)
20. Question: A Diwali lamp burns for 4 hours with 100 ml of oil. How long will it burn with 150 ml of oil?
    Answer: 6 hours. (Burn rate: 100 ml ÷ 4 hours = 25 ml/hour. With 150 ml: 150 ÷ 25 = 6 hours.)
21. Question: You have 3 identical boxes. One contains two gold coins, one contains two silver coins, and one contains one gold and one silver coin. You choose a box at random and draw one coin from it at random. When you look, it’s gold. What’s the probability the other coin in the same box is also gold?
    Answer: 2/3. (Probability analysis: 3 gold coins total, equal chance of picking each. Two are in the gold-gold box, one in the mixed box. Probability of gold-gold box given gold coin: 2/3.)
22. Question: If today is Wednesday, what day will it be 100 days from now?
    Answer: Tuesday. (100 ÷ 7 = 14 weeks and 2 days. Wednesday + 2 days = Tuesday.)100 Brain Teasers
23. Question: You have 5 identical ladoos and 3 identical plates. How many ways can you distribute the ladoos on the plates (plates can be empty)?
    Answer: 21. (Use stars and bars: 5 ladoos, 3 plates, number of non-negative integer solutions to x + y + z = 5 is C(5+3-1, 3-1) = C(7, 2) = 21.)
24. Question: A clock strikes once at 1:00, twice at 2:00, and so on, up to 12 times at 12:00. How many times does it strike in a 12-hour period?
    Answer: 78. (Sum of strikes: 1 + 2 + … + 12 = 12 × 13 ÷ 2 = 78.)

Relationships

25. Question: At a family reunion in Mumbai, Anil says, “Bina is my sister, and Chetan is my brother-in-law.” Who is Chetan married to?
    Answer: Bina. (Chetan is Anil’s brother-in-law, so Chetan is married to Anil’s sister, Bina.)
26. Question: If Priya’s mother is married to Rohan’s father, and Priya is not Rohan’s sister, what is Priya’s relationship to Rohan?
    Answer: Step-sister. (Priya’s mother is married to Rohan’s father, but Priya is not his sister, so they are step-siblings.)
27. Question: At a school event, three friends, Amit, Bela, and Chirag, each shake hands with the others exactly once. How many handshakes occur?
    Answer: 3. (For 3 people, each shakes hands with 2 others, but each handshake involves 2 people. Total: C(3, 2) = 3.)
28. Question: If Deepak’s cousin is married to Esha’s brother, and Esha is not Deepak’s sister, what is Deepak’s relationship to Esha’s brother?100 Brain Teasers
    Answer: Cousin. (Esha’s brother is married to Deepak’s cousin, so Deepak and Esha’s brother are cousins.)
29. Question: In a village, if every pair of friends invites each other to their weddings, and there are 5 friends, how many invitations are sent?
    Answer: 20. (Each of 5 friends invites 4 others, but each invitation is mutual. Total directed invitations: 5 × 4 = 20.)
30. Question: If Meena’s father-in-law is Ravi’s father, and Ravi is not Meena’s brother, what is Meena’s relationship to Ravi?
    Answer: Wife. (Meena’s father-in-law is Ravi’s father, so Meena is married to Ravi.)
31. Question: Four siblings are seated in a circle. If each gives a gift to the person on their right, how many gifts are exchanged?
    Answer: 4. (Each of the 4 siblings gives one gift to the person on their right, so 4 gifts.)
32. Question: If Anil’s wife is Bina’s sister-in-law and Bina is unmarried, what is Anil’s relationship to Bina?
    Answer: Brother. (Bina is unmarried, so Anil’s wife is Bina’s sister-in-law, meaning Anil is married to Bina’s sister. Thus, Anil is Bina’s brother.)100 Brain Teasers

Wisdom

33. Question: A farmer in Punjab has 3 sons but no daughters. He wants to divide his 15-acre land equally among them but only after they work together to plant crops. How many acres does each son get?
    Answer: 5 acres. (15 acres ÷ 3 sons = 5 acres each.)100 Brain Teasers
34. Question: You have two buckets: one holds 5 liters, the other 3 liters. How can you measure exactly 4 liters of water from a well?
    Answer: Fill the 5-liter bucket, pour into the 3-liter bucket until full, leaving 2 liters in the 5-liter bucket. Empty the 3-liter bucket, pour the 2 liters into it, fill the 5-liter bucket again, and pour from it into the 3-liter bucket until full (1 liter). The 5-liter bucket now has 4 liters.
35. Question: A wise teacher in Varanasi says, “I speak only the truth.” If she says, “This statement is false,” is she telling the truth?
    Answer: The statement is a paradox (liar paradox). It cannot be consistently true or false, so the teacher cannot make this statement while always telling the truth.
36. Question: You’re offered two envelopes: one contains twice as much money as the other. After picking one, you see it has ₹1000. Should you switch to the other envelope?
    Answer: Yes, switch. (Expected value of switching is higher: 50% chance of ₹500, 50% chance of ₹2000, average ₹1250 > ₹1000.)
37. Question: A sage gives you 3 identical boxes: one with two gold coins, one with two silver coins, one with one gold and one silver coin. You pick a box and draw a coin; it’s gold. Should you pick the other coin from the same box or switch boxes?
    Answer: Pick the other coin from the same box. (Probability the other coin is gold is 2/3, as in question 21.)
38. Question: In a race, you overtake the second-place runner just before the finish line. What is your position?
    Answer: Second place. (Overtaking the second-place runner means you move ahead of them, taking their position, while the first-place runner remains ahead.)100 Brain Teasers
39. Question: A merchant in Jaipur has 7 bags of spices, one weighing less than the others. Using a balance scale twice, how can you identify the lighter bag?
    Answer: Divide into 3 groups: 3 bags, 3 bags, 1 bag. Weigh 3 vs. 3. If equal, the lighter bag is the 1. If not, take the lighter group of 3, weigh 1 vs. 1. If equal, the third bag is lighter; if not, the lighter side is the answer.
40. Question: If you have 10 identical coins and one is heavier, how can you find the heavier coin using a balance scale in 3 weighings?
    Answer: Divide into 3, 3, 4. Weigh 3 vs. 3. If equal, weigh 3 from the 4 vs. 3 normal coins. If equal, the remaining coin is heavier; if not, weigh 1 vs. 1 from the heavier group to identify. If the first weighing is unequal, take the heavier 3, weigh 1 vs. 1, and proceed similarly.100 Brain Teasers

Science

41. Question: In a biogas plant in rural India, methane is produced from cow dung. If 1 kg of dung produces 0.05 m³ of methane, how much dung is needed for 2 m³ of methane?
    Answer: 40 kg. (2 m³ ÷ 0.05 m³/kg = 40 kg.)100 Brain Teasers
42. Question: A plant in your school garden grows 2 cm daily. If it’s 10 cm tall on Monday, what height will it be on Sunday?
    Answer: 22 cm. (From Monday to Sunday is 6 days. 6 × 2 cm = 12 cm growth. Total: 10 + 12 = 22 cm.)
43. Question: If a human body has about 0.2 mg of iron per kg of body weight, how much iron is in a 50 kg person?
    Answer: 10 mg. (0.2 mg/kg × 50 kg = 10 mg.)
44. Question: During monsoons, a rooftop collects 1000 liters of rainwater in 2 hours. If the collection rate is constant, how much water is collected in 5 hours?
    Answer: 2500 liters. (Rate: 1000 ÷ 2 = 500 liters/hour. For 5 hours: 500 × 5 = 2500 liters.)
45. Question: A solar panel generates 200 watts per square meter. If a 5 m² panel powers a 600-watt bulb, how many hours can it run in 3 hours of sunlight?
    Answer: 5 hours. (Power generated: 200 × 5 = 1000 watts. Energy in 3 hours: 1000 × 3 = 3000 watt-hours. Bulb uses 600 watts/hour. 3000 ÷ 600 = 5 hours.)
46. Question: If a bacteria colony doubles every hour, and it fills a petri dish in 10 hours, when was the dish half full?
    Answer: 9 hours. (Since it doubles every hour, half full is one hour before fully full: 10 – 1 = 9 hours.)
47. Question: In a food chain, if 10,000 J of energy is available at the producer level, how much energy reaches the tertiary consumer in a typical ecosystem (10% transfer efficiency)?
    Answer: 10 J. (10% per level: 10,000 → 1000 → 100 → 10 J.)
48. Question: A pendulum clock in a Himalayan village ticks slower at higher altitude. If it loses 1 second per hour at 2000 m, how many seconds does it lose in a day?
    Answer: 24 seconds. (1 second/hour × 24 hours = 24 seconds.)100 Brain Teasers

Puzzles

49. Question: Arrange the numbers 1 to 9 in a 3×3 grid so each row, column, and diagonal sums to 15.
    Answer: Magic square:8 3 4 1 5 9 6 7 2
50. Question: You have 8 bags of rice, one lighter than the others (all others weigh the same). Using a balance scale twice, how do you find the lighter bag?
    Answer: Same as question 39.
51. Question: In a Sudoku grid, if the top-left 3×3 block has numbers 1, 2, 3 in the first row, what number can’t be in the second row of that block?
    Answer: 1, 2, 3. (Sudoku rules: no repeats in rows, columns, or 3×3 blocks.)100 Brain Teasers
52. Question: A river has 5 boats, each carrying 1 to 5 people. If you need exactly 12 people to cross, how many boats are needed?
    Answer: 3 boats. (Use boats with 5, 4, and 3 people: 5 + 4 + 3 = 12.)
53. Question: You have 4 weights: 1 kg, 3 kg, 9 kg, 27 kg. How can you weigh 13 kg of spices using a balance scale?
    Answer: Place 9 kg and 3 kg on one side, 1 kg and the spices on the other. (9 + 3 = 12 + 1 = 13 kg.)
54. Question: In a chessboard puzzle, place 8 queens so none threaten each other. Provide one solution.
    Answer: One solution: Queens on (1,2), (2,4), (3,6), (4,8), (5,3), (6,1), (7,7), (8,5).100 Brain Teasers
55. Question: A Diwali rangoli has 5 concentric circles. If each circle’s radius increases by 2 cm, and the smallest radius is 2 cm, what’s the total area of the rangoli?
    Answer: 110π cm². (Radii: 2, 4, 6, 8, 10 cm. Area: π(2² + 4² + 6² + 8² + 10²) = π(4 + 16 + 36 + 64 + 100) = 110π cm².)
56. Question: You have 9 coins, one heavier. Using a balance scale twice, can you always find the heavier coin?
    Answer: No. (With 9 coins, 3 groups of 3, first weighing identifies the heavier group, but second weighing cannot always distinguish among 3 coins.)

Physics

57. Question: A stone is dropped from a 45 m tall building in Delhi. How long does it take to hit the ground (ignore air resistance, g = 10 m/s²)?
    Answer: 3 seconds. (Use s = ut + ½gt², u = 0, s = 45, g = 10. So, 45 = ½ × 10 × t², t² = 9, t = 3 s.)
58. Question: A 2 kg object moves at 5 m/s. If its speed doubles, what is its new kinetic energy?
    Answer: 200 J. (Initial KE = ½ × 2 × 5² = 25 J. New speed = 10 m/s. New KE = ½ × 2 × 10² = 100 J. Doubled speed quadruples KE: 25 × 4 = 100 J.)
59. Question: A bulb uses 100 W of power. If it’s on for 5 hours daily, how many kWh does it use in a month (30 days)?
    Answer: 15 kWh. (Energy = 100 W × 5 h × 30 = 15,000 Wh = 15 kWh.)
60. Question: A car accelerates from 0 to 20 m/s in 5 seconds. What is its acceleration?
    Answer: 4 m/s². (Acceleration = (final velocity – initial velocity) ÷ time = (20 – 0) ÷ 5 = 4 m/s².)
61. Question: A 10 kg box is pushed with 50 N force on a frictionless surface. What is its acceleration?
    Answer: 5 m/s². (F = ma, so a = F ÷ m = 50 ÷ 10 = 5 m/s².)
62. Question: If a satellite orbits Earth at a constant speed, is it accelerating? Why?
    Answer: Yes, because its direction changes (centripetal acceleration), even if speed is constant.
63. Question: A 500 g ball is thrown upward with 20 m/s. What is its velocity after 2 seconds (g = 10 m/s²)?
    Answer: 0 m/s. (v = u – gt = 20 – 10 × 2 = 0 m/s.)
64. Question: A fan blade rotates at 60 rpm. How many radians does it cover in 10 seconds?
    Answer: 20π radians. (60 rpm = 1 rev/s. In 10 s: 10 revs × 2π = 20π radians.)100 Brain Teasers

Chemistry

65. Question: If 22 g of CO₂ is produced by burning carbon, how many grams of carbon were burned? (C = 12, O = 16)
    Answer: 6 g. (Molar mass CO₂ = 12 + 32 = 44 g/mol. Carbon = 12 g/mol. 22 g CO₂ = 0.5 mol. 1 mol CO₂ needs 1 mol C, so 0.5 mol C = 0.5 × 12 = 6 g.)
66. Question: A 100 ml solution has 5 g of salt. If 50 ml of water evaporates, what is the new concentration?
    Answer: 10 g/100 ml. (New volume = 100 – 50 = 50 ml. Salt remains 5 g. Concentration = 5 g ÷ 50 ml = 0.1 g/ml = 10 g/100 ml.)
67. Question: In a reaction, 2 moles of H₂ react with 1 mole of O₂ to form water. How many moles of water are produced?
    Answer: 2 moles. (2H₂ + O₂ → 2H₂O. 2 moles H₂ produce 2 moles H₂O.)100 Brain Teasers
68. Question: If 10 g of sodium (Na = 23) reacts with chlorine to form NaCl, how many moles of NaCl are formed?
    Answer: 0.435 moles. (Moles of Na = 10 ÷ 23 ≈ 0.435. 1 mole Na forms 1 mole NaCl, so 0.435 moles NaCl.)
69. Question: What is the pH of a solution with a hydrogen ion concentration of 10⁻³ M?
    Answer: 3. (pH = -log[H⁺] = -log(10⁻³) = 3.)100 Brain Teasers
70. Question: If 18 g of water (H₂O) is decomposed, how many grams of hydrogen are produced? (H = 1, O = 16)
    Answer: 2 g. (Molar mass H₂O = 18 g/mol. 1 mole H₂O produces 1 mole H₂ (2 g). So, 18 g H₂O → 2 g H₂.)
71. Question: A gas occupies 2 L at 1 atm. If pressure increases to 2 atm (constant temperature), what is the new volume?
    Answer: 1 L. (Boyle’s Law: P₁V₁ = P₂V₂. 1 × 2 = 2 × V₂, V₂ = 1 L.)
72. Question: In a neutralization reaction, how many moles of HCl react with 1 mole of Ca(OH)₂?
    Answer: 2 moles. (Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O.)100 Brain Teasers

Astronomy

73. Question: If the Moon is 384,400 km from Earth, and light travels at 3 × 10⁵ km/s, how long does it take for moonlight to reach India?
    Answer: 1.28 seconds. (Time = distance ÷ speed = 384,400 ÷ 3 × 10⁵ ≈ 1.28 s.)
74. Question: During Diwali, you observe a star directly overhead at 8 PM. If Earth rotates 15° per hour, where will the star be at 10 PM?
    Answer: 30° west. (In 2 hours, Earth rotates 2 × 15° = 30° west.)
75. Question: If a planet’s year is 2 Earth years, and it has 2 moons, how many times does it orbit its star in 8 Earth years?
    Answer: 4 times. (8 Earth years ÷ 2 Earth years/orbit = 4 orbits.)
76. Question: The Sun’s diameter is 1.39 million km. If it appears as a 1 cm disc from Earth, how far is it (approx.)?
    Answer: 139 million km. (Ratio: 1 cm ÷ 1.39 × 10⁶ km = x ÷ 1.39 × 10⁸ km. Solve: x ≈ 139 million km.)100 Brain Teasers
77. Question: If a comet’s orbit takes 76 years, when will it next appear if seen in 2025?
    Answer: 2101. (2025 + 76 = 2101.)
78. Question: Mars is 1.5 AU from the Sun (1 AU = distance from Earth to Sun). If Earth is 1 AU, how much longer does sunlight take to reach Mars?
    Answer: 4 minutes. (1 AU ≈ 8 light-minutes. Mars: 1.5 × 8 = 12 minutes. Difference: 12 – 8 = 4 minutes.)
79. Question: If a star’s light takes 100 years to reach Earth, how far is it in light-years?
    Answer: 100 light-years. (Distance = time × speed of light = 100 years.)100 Brain Teasers
80. Question: During a lunar eclipse in India, the Moon appears red. Why?
    Answer: Earth’s atmosphere scatters shorter wavelengths of sunlight, allowing red light to reach the Moon.

Geography

81. Question: If the Ganges River is 2525 km long and a boat travels 50 km/day, how many days to travel its length?
    Answer: 51 days. (2525 ÷ 50 = 50.5, round up to 51 days.)
82. Question: Which Indian state has the longest coastline?100 Brain Teasers
    Answer: Gujarat. (Approximately 1600 km.)
83. Question: If Delhi is at 28°N latitude and Chennai at 13°N, how many degrees of latitude separate them?
    Answer: 15°. (28 – 13 = 15°.)
84. Question: The Thar Desert receives 25 cm of rain annually. If a 1 km² area collects all this rain, how many liters of water is that?
    Answer: 250 million liters. (1 km² = 10⁶ m². Rain = 0.25 m. Volume = 10⁶ × 0.25 = 250,000 m³ = 250 million liters.)
85. Question: If India’s time zone is IST (UTC+5:30), and it’s 12 PM in Delhi, what time is it in London (UTC)?
    Answer: 6:30 AM. (12 PM – 5:30 hours = 6:30 AM.)100 Brain Teasers
86. Question: The Himalayas rise 2 cm/year due to tectonic activity. How many years for a 1 m rise?
    Answer: 50 years. (1 m = 100 cm. 100 ÷ 2 = 50 years.)
87. Question: If Kerala produces 600,000 tons of coconuts annually, and each tree yields 50 kg, how many trees are needed?
    Answer: 12 million. (600,000 tons = 600 million kg. 600 million ÷ 50 = 12 million trees.)
88. Question: Which Indian river flows into the Arabian Sea?
    Answer: Narmada. (It flows westward into the Arabian Sea.)100 Brain Teasers

Civics

89. Question: If India’s Lok Sabha has 543 elected members, and a party needs a majority to form the government, how many seats are required?
    Answer: 272. (Majority = 543 ÷ 2 + 1 = 271.5, round up to 272.)
90. Question: How many fundamental rights are guaranteed by the Indian Constitution?
    Answer: Six. (Right to equality, freedom, against exploitation, freedom of religion, cultural and educational rights, and constitutional remedies.)
91. Question: If a village panchayat has 9 members and a decision requires a 2/3 majority, how many votes are needed?
    Answer: 6. (2/3 of 9 = 6.)
92. Question: Who appoints the Chief Justice of India?100 Brain Teasers
    Answer: The President of India.
93. Question: If a state legislative assembly has 60 members, how many must be present for a quorum (1/10 of total)?
    Answer: 6. (1/10 of 60 = 6.)
94. Question: In India, at what age can a citizen vote in national elections?
    Answer: 18.
95. Question: If the Rajya Sabha has 245 members, and 1/3 retire every 2 years, how many retire in 6 years?
    Answer: 245. (In 6 years, 3 cycles of 1/3 retire: 3 × (245 ÷ 3) ≈ 245, as all members retire once.)
96. Question: What is the minimum age to become the President of India?100 Brain Teasers
    Answer: 35.

History

97. Question: If the Indus Valley Civilization began around 3300 BCE and ended around 1300 BCE, how long did it last?
    Answer: 2000 years. (3300 – 1300 = 2000 years.)
98. Question: How many years after India’s independence (1947) was the Constitution adopted (1950)?
    Answer: 3 years. (1950 – 1947 = 3.)
99. Question: If Ashoka ruled from 268 BCE to 232 BCE, how long was his reign?
    Answer: 36 years. (268 – 232 = 36.)
100. Question: The Battle of Plassey was fought in 1757. How many years ago was it in 2025?
     Answer: 268 years. (2025 – 1757 = 268.)100 Brain Teasers

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