BISC 2026- Interschool Quantum Quest 3

A factory produces 720 items in a day. On Monday, 1/4 of the items are defective. On Tuesday, 1/5 of the remaining items are defective. How many non-defective items remain after both days?

• 432

• 432

• 450

• 460

• 3 hours

• 4 hours

• 2.5 hours

• 3.5 hours

A cylindrical water tank has radius 3 m and height 6 m. A pipe fills it at 1 m³/min. If a solid sphere of radius 1 m is placed inside the tank, how long will it take to fill the tank ignoring the displaced water? Give your answer to the nearest minute.

• 50 min

• 52 min

• 53 min

• 165 min

A bag contains 5 red, 4 blue, and 3 green balls. Three balls are drawn without replacement. What is the probability that exactly one red ball is drawn?

• 630/1320

• 631/1320

• 645/1320

• 754/1320

A company’s monthly revenue (AED) for the first 6 months is: Month | Jan | Feb | Mar | Apr | May | Jun Revenue | 45,000 | 47,500 | 50,000 | 52,500 | 55,000 | 57,500 If the trend continues linearly, what is the expected revenue in September and in which month will revenue exceed AED 65,000?

• 65,000 AED in Sep; Revenue exceeds AED 65,000 in Oct

• 62,500 AED in Sep; Revenue exceeds AED 65,000 in Nov

• 60,000 AED in Sep; Revenue exceeds AED 65,000 in Oct

• 60,500 AED in Sep; Revenue exceeds AED 65,000 in Nov