IBC Quiz #196
13/03/2026
Deepthi Priya R
Class 8
DDPS
Pavan
Class 8
Sri Vasavi Vidya samsthe sira
Yashwanth
Class 8
Royal English medium school
Lohith
Class 8
Vidya Jyoti school
Harsha M
Class 4
Thyagaraju central school
Indu Shree
Class 8
Sri Sharda English High School
V.CSai Rahul
Class 8
Vidya Jyothi School
N.Rudraansh
Class 8
Swargarani School & P.U College
N.Srikruthi
Class 8
Swargarani School & P.U College
Abhishta Bhat
Class 8
KSVK International 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 #196
March 13, 2026
Arjun is designing a laser puzzle level for his school’s tech fest game. Inside a square room, two laser emitters (L1 and L2) are installed, as shown in Image 2.
Two target sensors (T1 and T2) are placed as shown in Image 2.
Image 1 illustrates an example of how a laser beam can be redirected using mirrors placed at marked slots to reach a target sensor.
Inside the room, there are five fixed mirror slots: M1, M2, M3, M4 and M5.
Each double-sided plain mirror can be placed in one of two orientations:
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/
-
\
The mirrors reflect laser beams according to the following rules:
Mirror behaviour:
Mirror /
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→ becomes ↑
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↓ becomes ←
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↑ becomes →
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← becomes ↓
Mirror \
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→ becomes ↓
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↑ becomes ←
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↓ becomes →
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← becomes ↑
Objective:
Arrange the mirrors so that:
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Laser L1 reflects through the mirrors and hits Target T1.
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Laser L2 reflects through the mirrors and hits Target T2.
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Both lasers travel simultaneously inside the room.
Rules
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Laser L1 is positioned and fires in the direction shown in the image above.
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Laser L2 is positioned and fires in the direction shown in the image above.
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The lasers reflect according to the orientation of the mirrors placed at M1–M5.
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A laser fails if it hits a wall before reaching its correct target.
Each target must be hit by the correct laser:
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L1 → T1
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L2 → T2
Question:
Four possible mirror configurations are shown in Options A, B, C, and D. The task is to determine which configuration correctly guides Laser L1 to Target T1 and Laser L2 to Target T2, ensuring that both laser beams reach their respective targets by reflecting off the mirrors and without either beam hitting a wall first.
Arjun is designing a laser puzzle level for his school’s tech fest game. The laser and the target sensor are placed as shown in the Image 2. The laser cannot reach the target directly.
Image 1 illustrates an example of how a laser beam can be redirected using mirrors placed at marked slots to reach a target sensor.
To solve the puzzle, the player must place four double-sided plane mirrors in the fixed slots marked M1, M2, M3 and M4 inside the room. Each mirror can only be tilted in one of two ways: / or \ .
The laser must bounce off all four mirrors in order and hit the target to unlock the next level.
Details:
How mirrors work:
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Mirror / → beam going → deflects ↑ | beam going ↓ deflects ← | beam going ↑ deflects → | beam going ← deflects ↓
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Mirror \ → beam going → deflects ↓ | beam going ↑ deflects ← | beam going ↓ deflects → | beam going ← deflects ↑
Rules:
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The laser is positioned and fires in the direction shown in the image above.
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It must reflect off M1 → M2 → M3 → M4 in that order.
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After reflecting from M4, the laser must reach the target as shown in the image above.
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If the beam hits a wall before reaching all four mirrors, the level fails.
Question:
Which mirror arrangement guides the laser through all four mirrors and hits the target?
IBC Quiz #195
March 06, 2026
Scenario
In the YuviPep Robotics class, students built an Art Bot that creates patterns using vibration. A student told his brother about it, and his brother became curious and decided to build his own Art Bot for an endurance competition.
The goal is to create the largest possible pattern without:
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The bot running out of power
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The bot drifting off the 60 cm × 60 cm testing table
(The bot must not travel more than 30 cm from the centre.)
The student discovered that:
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As the motor speed increases,
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The current (I) drawn from the battery increases and
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The drift speed (D) increases.
Constraints
Time: The bot must run for exactly 10 minutes.
Battery: Total capacity = 15 mAh.
Boundary: Total drift must be ≤ 30 cm.
Goal: Maximise the pattern radius.
Question:
Which motor speed should the student choose to achieve the largest possible pattern radius while ensuring that:
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The battery lasts for the full 10 minutes and
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The bot remains on the table?
Scenario
In the YuviPep Robotics class, students built an Art Bot that creates patterns using vibration.
The Art Bot consists of:
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Three sketch pens forming a stable tripod base
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A small DC motor fixed at the centre
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A small off-centre metal weight attached to the motor shaft
When the motor rotates, the off-centre weight produces vibration, causing the bot to move and draw circular patterns.
After the class, one student became curious about how motor speed affects the size of the patterns. He tested the bot at different speeds and carefully measured how far the robot drifted outwards from the centre each minute. The student increased the motor speed by raising the battery voltage supplied to the DC motor.
The Art Bot starts exactly at the centre of a 30 cm × 30 cm square sheet.
The maximum distance it can move from the centre without going beyond the paper is 15 cm.
The bot will run continuously for 5 minutes.
The student wants to ensure that:
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The design remains completely within the paper.
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The circle size is greater than 2 cm so that it appears creative.
Question:
Which motor speed should the student choose so that, after 5 minutes, the Art Bot:
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Remains completely within the 30 cm × 30 cm sheet and
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Produces a creative pattern (radius greater than 2 cm)?
