51 extractive question-and-answer pairs built from Report Teaching Aids Competition, published by cbseacademic.nic.in. 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. 19 of the 51 pairs (37.3%) are explanatory questions and 32 restate a figure. 100.00% of rows pass the corpus quality gate.
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Usable for analysis, but expect some cleaning before you rely on it.
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First 10 of 51 rows
| question | answer | context | answer_start | question_type | knowledge_quality_score | source_quote | source_page | source_location | confidence | validation_status |
|---|---|---|---|---|---|---|---|---|---|---|
| What role do Background Teaching aids play in a classroom? | 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 | 1.000 | Background Teaching aids are an integral component in any classroom. | 3 | page=3,block=0 | 0.850 | valid |
| What is the function of an 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 | 1.000 | 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 does the pin's rotation angle represent when the analyzer pipe is turned? | the angle between the pass axes of polarizer and analyzer | When the second pipe carrying analyzer is rotated, the angle of rotation of the pin gives the angle between the pass axes of polarizer and analyzer. The other end of the second pipe is closed by a cap carrying a LDR at its centre. The light coming from the second Polaroid incident on the LDR converts the light intensity into voltage variation with the help of a simple electronic circuit consisting of a transistor and 3 resistors. The variation in voltage is measured by a multimeter. OPTICAL POLARIZER (SCHEMATIC DIAGRAM) Working The LED torch with a parabolic mirror is switched on to produce a parallel beam of light. The light coming out of the pipe fitted with the polarizer is plane polarized. The pipe fitted with analyzer is rotated so that the pointer reads zero degree on the circular scale. | 90 | definition | 1.000 | When the second pipe carrying analyzer is rotated, the angle of rotation of the pin gives the angle between the pass axes of polarizer and analyzer. | 48 | page=48,block=0 | 0.700 | valid |
| What are tunnels with recesses for graves often called? | Tunnels with recesses for graves. Often used in the plural. | Created with The Teachers Corner.net Crossword Puzzle Generator Across 2. A usually chronological record of events. 4. Brightly colored; gaudy. 8. Tunnels with recesses for graves. Often used in the plural. 9. Having a highly developed society and culture. 10. To make repairs or restoration to 11. Prevented from growing or developing 12. A rodent having a long flexible bushy tail Down 1. Clouded or blurred by 3. To correct deficiencies in eyesight 5. Marked by misfortune 6. Knotty or misshapen 7. The chief executive of a state | 147 | definition | 1.000 | 8. Tunnels with recesses for graves. Often used in the plural. 9. | 36 | page=36,block=11 | 0.700 | valid |
| What materials are Two uprights made of? | 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 | 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 confirms that the light reflected at Brewster's angle is completely plane polarized? | the intensity of the light in the field of view varies from maximum to minimum according to Malus law | Now the reflected light is seen through the analyzer. The analyzer is slowly rotated through 900 in the vertical plane. It can be observed that the intensity of the light in the field of view varies from maximum to minimum according to Malus law. This is possible if and only if the reflected light is completely plane polarized. This confirms that the light reflected at Brewster‟s angle is completely plane polarized. When the angle of incidence is set for any other angle, this phenomenon cannot be observed. Thus establishes the existence of Brewster‟s angle, using this equipment. | 144 | relationship | 0.970 | It can be observed that the intensity of the light in the field of view varies from maximum to minimum according to Malus law. | 49 | page=49,block=0 | 0.700 | valid |
| What is a benefit of enrichment classes for students? | students are able to recall what the lines represent and they are able to remember the explanation given by the teacher | 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. | 92 | summary | 0.970 | 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. | 26 | page=26,block=0 | 0.700 | valid |
| What does 'Lost Spring' reveal about child labour in India? | an authentic picture of child labour prevalent in India | The story „Lost Spring‟ gives us an authentic picture of child labour prevalent in India. What measures would you suggest to stop child labour? 3. The extract „Lost Spring‟ tells us about the callousness of society and the political class to the sufferings of the poor. Is this true of contemporary India. Cite examples. 4. What are the two distinct worlds referred by Anees Jung in the lessons „Lost Sprint‟ 5. The beauty of the glass bangles of Firozabad contrasts with the misery of the people who produce them. Comment. | 33 | summary | 0.970 | The story „Lost Spring‟ gives us an authentic picture of child labour prevalent in India. | 37 | page=37,block=3 | 0.700 | valid |
| What issue does 'Lost Spring' reveal about society's treatment of the poor? | the callousness of society and the political class to the sufferings of the poor | The story „Lost Spring‟ gives us an authentic picture of child labour prevalent in India. What measures would you suggest to stop child labour? 3. The extract „Lost Spring‟ tells us about the callousness of society and the political class to the sufferings of the poor. Is this true of contemporary India. Cite examples. 4. What are the two distinct worlds referred by Anees Jung in the lessons „Lost Sprint‟ 5. The beauty of the glass bangles of Firozabad contrasts with the misery of the people who produce them. Comment. | 188 | summary | 0.970 | The extract „Lost Spring‟ tells us about the callousness of society and the political class to the sufferings of the poor. | 37 | page=37,block=3 | 0.700 | valid |
| What does the experiment with slits S1 and S2 help the student understand? | polarization and 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 | 404 | summary | 0.970 | 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 | valid |
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