177 extractive question-and-answer pairs built from Report Teaching Aids Competition, published by cbseacademic.nic.in. The source is a 55-page publication. Source-evidenced topics include cbse school teachers’ teaching aids competition, 2019, teaching aids, regional level competition, bharatiya vidya bhawan, kasturba gandhi marg, new delhi, science. Every answer is a verbatim span of text the source prints, and each row carries the passage it sits in, its offset in that passage, the source quote, the page and the location in the document, so any row can be checked against the original. Question types in the export: 142 factual, 14 relationship, 8 summary, 7 list, 6 definition. 35 of the 177 pairs (19.8%) ask explanatory questions; the remaining 142 are factual or table-based questions. 98.31% of rows pass the corpus quality gate.
This dataset contains 177 extractive question-and-answer pairs derived from the CBSE Teaching Aids Competition 2019 report. The questions span factual, relationship, summary, list, and definition types, with 19.8% focusing on explanatory content. Each answer is a verbatim excerpt from the source document, ensuring traceability to the original publication. Topics include teaching methodologies, interdisciplinary benefits, and venue details for regional competitions. The dataset provides insights into educational practices and innovations showcased during the event.
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# One-time install: pip install desidata
# Set DD_TOKEN in your environment first (create a free token in Profile & settings).
import desidata
df = desidata.load("cbseacademic-nic-in-7d1492fabc071bee2a1e526b8f1a10df")
df.head()First 10 of 177 rows
| question | answer | context | answer_start | question_type | knowledge_quality_score | source_document | source_quote | source_page | source_location | confidence | validation_status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| What does the string's cylindrical shape in the mechanical polarizer represent? | unpolarized light consisting vibrations in all directions | The axis of the motor, centre of the slits and edge of the pulley are arranged to lie in the same horizontal level and same straight line. Working The slit S1 is kept at a suitable distance nearly 30 cm from the disc, and the slit S2 at a distance of 30 cm from the slit S1. The string is given a suitable tension by placing weight in the hanger. When the motor is switched on, as the disc rotates we can see that the string forms a cylindrical shape in air between the disc and slit S1 which represents unpolarized light consisting vibrations in all directions. We can see the vibrations of the string emerging out of the slit is confined in one plane representing the plane polarized light. When the orientation of the slit S1 which act as the polarizer is changed, we can see that the plane of vibration of string is also changed. | 504 | definition | 1.000 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | When the motor is switched on, as the disc rotates we can see that the string forms a cylindrical shape in air between the disc and slit S1 which represents unpolarized light consisting vibrations in all directions. | 47 | page=47,block=0 | 0.700 | valid |
| What are Background Teaching aids? | an integral component in any classroom | Background Teaching aids are an integral component in any classroom. Good teaching aids play a vital role in enhancing learning. | 29 | definition | 0.980 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | Background Teaching aids are an integral component in any classroom. | 3 | page=3,block=0 | 0.850 | valid |
| What are Two uprights? | made of hylom sheets of length 10 inches and breadth 2 inches, and plastic brackets | A circular scale graduated in degrees is also fixed at the centre about the same axis. Two uprights are made of hylom sheets of length 10 inches and breadth 2 inches, and plastic brackets. These uprights can be moved on the optical bench in the horizontal plane about the axis passing through their one end. | 104 | definition | 0.980 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | Two uprights are made of hylom sheets of length 10 inches and breadth 2 inches, and plastic brackets. | 48 | page=48,block=0 | 0.850 | valid |
| What is Optical polarizer? | an exact optical version of abovesaid mechanical polarizer which can explain polarization that takes place in optics | How plane of vibration changes according to the rotation of pass axis of the polarizer, how polarization helps to confirm the transverse wave nature of light, how Malus law is obeyed by plane polarized light etc. Optical polarizer is an exact optical version of abovesaid mechanical polarizer which can explain polarization that takes place in optics. Brewster‟s angle detector is another device that can establish the existence of Brewster‟s angle (which is | 234 | definition | 0.980 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | Optical polarizer is an exact optical version of abovesaid mechanical polarizer which can explain polarization that takes place in optics. | 46 | page=46,block=9 | 0.850 | valid |
| What makes pictorial representations effective for communication? | communicating a message in an emotionally evocative way | pay attention to the explanation taken up by the teacher. Thirdly, during enrichment class, students are able to recall what the lines represent and they are able to remember the explanation given by the teacher. Fourthly, pictorial representations cannot mirror actual reality, but each representation offers a different construction of the world and of experience in it, which becomes very effective for communicating a message in an emotionally evocative way. | 406 | definition | 0.980 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | Fourthly, pictorial representations cannot mirror actual reality, but each representation offers a different construction of the world and of experience in it, which becomes very effective for communicating a message in an emotionally evocative way. | 26 | page=26,block=0 | 0.700 | valid |
| How does polarization confirm the nature of light? | how polarization helps to confirm the transverse wave nature of light | Mechano-Optic Polariser cum Brewster’s Angle detector is an improvised working model for the visual demonstration in large dimension so that a student can get solid idea about polarization of light that takes place in the order of the wavelength of light. It helps a student to realize unpolarised (ordinary) light, how polarization of light takes place and plane polarizer light is obtained. How plane of vibration changes according to the rotation of pass axis of the polarizer, how polarization helps to confirm the transverse wave nature of light, how Malus law is obeyed by plane polarized light etc. Optical polarizer is an exact optical version of abovesaid mechanical polarizer which can explain polarization that takes place in optics. Brewster‟s angle detector is another device that can establish the existence of Brewster‟s angle (which is | 481 | relationship | 0.970 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | How plane of vibration changes according to the rotation of pass axis of the polarizer, how polarization helps to confirm the transverse wave nature of light, how Malus law is obeyed by plane polarized light etc. | ||||
| What awareness will students gain from using the aid? | the need of conserving energy resources in this condition of depletion of natural resources and in this era of climate change | They will be able to aware themselves and others about the need of conserving energy resources in this condition of depletion of natural resources and in this era of climate change. It will be an interdisciplinary link for the subject and also an experiential teaching and learning method that will make both teaching-learning process interesting and effective. | 55 | relationship | 0.970 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | They will be able to aware themselves and others about the need of conserving energy resources in this condition of depletion of natural resources and in this era of climate change. | 53 | page=53,block=0 | 0.700 | valid |
| What concept does the mechanical polarizer help students understand regarding plane polarized light? | Malus law regarding variation of intensity of plane polarized light | When the slit S2 at a suitable distance from S1 is rotated and they are parallel the entire vibration emerges out through the slit S2 and reaches upto the pulley. When we rotate S2 (which act as the analyzer) we can see that the vibration of the string emerging from slit S2 gradually reduces and becomes 0, when the two slits are perpendicular to each other. Now the student get a convincing idea about polarization and Malus law regarding variation of intensity of plane polarized light. MECHANICAL POLARIZER (SCHEMATIC DIAGRAM) OPTICAL POLARIZER Construction The optical polarizer is made up of a PVC pipe of diameter 4 cm and length 25 cm mounted horizontally DC Motor Slit S1 Slit S2 Pulley Weight hanger | 421 | relationship | 0.970 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | Now the student get a convincing idea about polarization and Malus law regarding variation of intensity of plane polarized light. | 47 | page=47,block=0 | 0.700 | |
| What does the Mechano-Optic Polariser demonstrate about the plane of vibration and the polarizer's pass axis? | How plane of vibration changes according to the rotation of pass axis of the polarizer | Mechano-Optic Polariser cum Brewster’s Angle detector is an improvised working model for the visual demonstration in large dimension so that a student can get solid idea about polarization of light that takes place in the order of the wavelength of light. It helps a student to realize unpolarised (ordinary) light, how polarization of light takes place and plane polarizer light is obtained. How plane of vibration changes according to the rotation of pass axis of the polarizer, how polarization helps to confirm the transverse wave nature of light, how Malus law is obeyed by plane polarized light etc. Optical polarizer is an exact optical version of abovesaid mechanical polarizer which can explain polarization that takes place in optics. Brewster‟s angle detector is another device that can establish the existence of Brewster‟s angle (which is | 393 | relationship | 0.970 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | It helps a student to realize unpolarised (ordinary) light, how polarization of light takes place and plane polarizer light is obtained. How plane of vibration changes according to the rotation of pass axis of the polarizer, how polarization helps to confirm the transverse wave nature of light, how Malus law is obeyed by plane polarized light etc. | ||||
| What does the Mechano-Optic Polariser help students realize about unpolarised light? | how polarization of light takes place and plane polarizer light is obtained | Mechano-Optic Polariser cum Brewster’s Angle detector is an improvised working model for the visual demonstration in large dimension so that a student can get solid idea about polarization of light that takes place in the order of the wavelength of light. It helps a student to realize unpolarised (ordinary) light, how polarization of light takes place and plane polarizer light is obtained. How plane of vibration changes according to the rotation of pass axis of the polarizer, how polarization helps to confirm the transverse wave nature of light, how Malus law is obeyed by plane polarized light etc. Optical polarizer is an exact optical version of abovesaid mechanical polarizer which can explain polarization that takes place in optics. Brewster‟s angle detector is another device that can establish the existence of Brewster‟s angle (which is | 316 | relationship | 0.970 | https://cbseacademic.nic.in/web_material/annualreport/Report_Teaching_Aids_Competition.pdf | It helps a student to realize unpolarised (ordinary) light, how polarization of light takes place and plane polarizer light is obtained. |
Read straight from the file — download or use the API URL for the full dataset.
| 46 |
| page=46,block=9 |
| 0.700 |
| valid |
| valid |
| 46 |
| page=46,block=9 |
| 0.700 |
| valid |
| 46 |
| page=46,block=9 |
| 0.700 |
| valid |