IBC Quiz #199
03/04/2026
Prathiksha.M
Class 4
Sri sharada English School Sidlaghatta
Unnathi gowda k v
Class 8
Bhavishyath public school pandavapura
REKHA CM
Class 8
GR International public school
Yashwanth
Class 8
Royal English medium school
Deepthi Priya R
Class 8
DDPS
Vishnu Sai
Class 8
DDPS
Lakshmi
Class 8
Sri Vasavi Vidya samsthe sira
Hema G S
Class 8
Sri Vasavi Vidya samsthe sira
Abhishta Bhat
Class 8
KSVK International School
Sunder shetty
Class 8
Bgs school
Note: Quiz prizes will be awarded to ten randomly selected students who submit correct answers before the deadline. Winners will be declared on the website and the weekly newsletter.
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Previous Week Quizzes
IBC Quiz #199
April 03, 2026
Scenario:
At a National Science Exhibition, students are competing in a Water Rocket Design Challenge. Just like in school rocket races, the goal is simple: “Whose rocket stays in the air the longest?”
However, this time, the conditions are different. All teams must use a 1.5-litre high-strength bottle.
Each team can independently choose:
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Water quantity
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Air pressure (pounds per square inch)
-
Launch angle
-
Nozzle diameter
Before the competition, Dr. Meena, the chief scientist overseeing the exhibition, conducted controlled calibration experiments using the same 1.5-litre bottle to help teams understand how different variables affect airtime.
Calibration Experiments (Dr Meena's Lab — 1.5-litre bottle only)
Dr Meena ran three controlled experiments, varying one parameter at a time and holding the others fixed. The fixed values used were : 5/8 water quantity, 55 pounds per square inch, 90-degree launch and a 10 millimetres nozzle.
Graph:
Experiment 3 — Airtime vs Nozzle Diameter
(Fixed: 5/8 water quantity, 55 pounds per square inch, 90-degree launch)
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When the nozzle diameter increased from 7 millimetres to 9 millimetres,
airtime increased by 1.8 seconds
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When the diameter increased from 9 millimetres to 11 millimetres,
- airtime decreased by 0.7 seconds
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When the diameter increased from 11 millimetres to 13 millimetres,
- airtime decreased by 1.6 seconds
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The airtime at 7 millimetres was 3.3 seconds
Data
Question:
Using all three calibration experiments, identify which team's rocket will stay in the air the longest?
Scenario:
It's the school's annual Rocket Races Day. Four friends — Arya, Bruno, Chitra and Dev — have each built a water-bottle rocket. The challenge: whose rocket stays in the air the longest?
Every team uses the same 2-litre bottle and the same hand pump, so all rockets are pressurised to exactly the same level. The two variables each team could control were (a) the quantity of water and (b) the launch angle.
Before the launch, Their science teacher, Mr. Suresh, oversaw the event and ran a quick calibration experiment. He filled a spare bottle to different water levels, always launching straight up (90°) and timed how long each rocket stayed in the air. His results are shown in the graph below.
Graph:
Data:
Question:
Using the data table, the graph and Mr Suresh's hint, which rocket stays in the air the longest?
IBC Quiz #198
March 27, 2026
Scenario
Arjun accompanies his father to a local clinic for a minor skin procedure. While waiting, he notices the doctor open a metal box, from which cold white fog rolls out and carefully remove a frosted instrument using thick gloves.
After the procedure, his father asks curiously,
"Why did the doctor take that instrument from a foggy, cold box?"
Arjun, who has just studied Newton's Law of Cooling, explains,
"That is a cryoprobe — it must be cooled below −20°C using liquid nitrogen (−196°C) to freeze and destroy skin lesions effectively. The fog is liquid nitrogen vapour escaping when the box is opened. The doctor uses Newton's Law of Cooling to calculate exactly when each probe is ready."
“According to Newton’s Law of Cooling, an object cools faster when it is much hotter than its surroundings. So, a probe with a smaller cooling factor value has cooled more and is colder.”
Newton’s Law of Cooling
The temperature of an object at time(t) is given by:
In this cryoprobe context
Procedure Condition
A procedure goes ahead only if both conditions are met:
-
The cryoprobe temperature is below−20°C
-
Patient temperature is below 39°C
Priority Rule
Priority 1: Elderly patients above 60 are treated first, followed by children under 10. If there are multiple patients within the same category (elderly or children), they are treated in arrival order.
Priority 2: All other patients are treated in arrival order after Priority 1.
Time Constraint
The surgeon receives an urgent call exactly 30 minutes after starting the first procedure and must leave immediately. Each cryotherapy procedure takes 15 minutes. A patient is fully treated only if their procedure starts and finishes within 30 minutes.
Data
Question
After applying the priority rules, calculating cryoprobe readiness, converting patient temperatures and evaluating the schedule, which patients are fully treated today, and which patient was not treated due to the surgeon’s emergency call?
Scenario
Arjun accompanies his father to a local clinic for a minor skin procedure. While waiting, he notices the doctor open a metal box, from which cold white fog rolls out and carefully remove a frosted instrument using thick gloves.
After the procedure, his father asks curiously,
"Why did the doctor take that instrument from a foggy, cold box?"
Arjun, who has just studied Newton's Law of Cooling, explains
"That is a cryoprobe — it must be cooled below −20°C using liquid nitrogen (−196°C) to freeze and destroy skin lesions effectively. The fog is liquid nitrogen vapour escaping when the box is opened. The doctor uses Newton's Law of Cooling to calculate exactly when each probe is ready.
“According to Newton’s Law of Cooling, an object cools faster when it is much hotter than its surroundings. So, a probe with a smaller cooling factor value has cooled more and is colder.”
Newton’s Law of Cooling
The temperature of an object at time(t) is given by:
In this cryoprobe context:
Procedure Condition
A procedure goes ahead only if both conditions are met:
-
Cryoprobe temperature is below −20°C
-
Patient temperature is below 39°C
Data
Question
Which patients are cleared for the procedure today, and which cryoprobe is furthest from being ready?
