SCERT Class 6 Science Chapter-9 Question Answer " Measurement of Length and Motion (लाउथाइनि जखा आरो खारथाइ)"
Key Highlights: Chapter 9 – Measurement of Length and Motion
1. Traditional Units of Measurement
Body-based Units: In ancient times, people measured lengths using body parts such as finger width (आसि), handspan (जलाइ — distance between the tip of the thumb and middle finger), and cubit (आखाइ — elbow to the tip of the middle finger).
Inconsistency: Because body proportions vary from person to person, these traditional units led to discrepancies and lacked reliability.
Historical Assamese Units:
- Currency / Value: आना (Ana), सिक्का (Sikka), आदलि (Adali), खाउरि (Khauri).
- Precious Metals (Gold/Silver): आना (Ana), त’ला (Tola), रति (Rati).
- Mass / Weight: फुवा (Phuwa), सेर (Ser), बान (Ban), म’न (Mon).
- Long Distances: य’जन (Yojan), क्र’श (Krosh).
2. Standard Units of Measurement (SI System)
Standard Unit: To eliminate global discrepancies, scientists adopted the International System of Units (SI Units). The SI unit of length is the metre (m).
Unit Relationships:
- 1 kilometre (km) = 1000 metres (m)
- 1 metre (m) = 100 centimetres (cm)
- 1 centimetre (cm) = 10 millimetres (mm)
Standard Laboratory Rulers: Small rulers typically measure up to 15 cm, while long rulers measure up to 30 cm. The smallest measurable reading on a standard centimeter scale is 1 mm.
Unit Convention: Numerical measurements must always be accompanied by appropriate units (e.g., 1 cm).
3. Rules for Accurate Length Measurement
Ruler Placement: The scale must be placed parallel and close to the object being measured.
Eye Position (Avoiding Parallax Error): The eye must be kept directly and vertically above the mark to read it accurately. Viewing at an angle causes reading errors.
Measuring with Damaged/Broken Scales: If the zero mark is damaged or missing, align the starting end to an intact mark (e.g., 3 cm) and subtract it from the final reading (e.g., 13 cm – 3 cm = 10cm).
Measuring Curved Lines: Straight rulers cannot measure curves directly; a flexible measuring tape or a non-stretchable thread traced along the curve and then compared against a standard ruler must be used.
4. Reference Point (रिजाय बिन्दो)
Definition: A fixed point, position, or object relative to which the location or distance of another object is determined.
Distance Dependency: The measured distance and perceived position of any object depend entirely on the chosen reference point.
5. Concept of Rest and Motion
Rest (दिदोम थासारि): An object is said to be at rest if its position does not change relative to a reference point over time.
Motion (खारसुमै थासारि): An object is said to be in motion if its position changes relative to a reference point over time.
Relativity of Motion: Motion is relative. For example, passengers sitting inside a moving bus are at rest relative to each other, but in motion relative to trees on the roadside.
6. Types of Motion
Rectilinear Motion (हांखोआरि खारथाइ): Movement along a straight path.
Examples: A car moving on a straight road, a striker hitting a carrom coin straight, a fruit falling from a tree, or a train moving on a straight track.
Circular Motion (बेंखनारि खारथाइ): Movement along a circular path where the object rotates or revolves around a center.
Examples: Blades of a rotating ceiling fan, a child running around a circular track, or a stone/rubber ball tied to a string and whirled around.
Periodic / Oscillatory Motion (दिन्दौनाय खारथाइ): A back-and-forth (उन-सिगां) repetitive movement about a fixed position that recurs at regular intervals of time.
Examples: A swinging pendulum in a clock, a child on a playground swing (हैसा-मैसा), or a see-saw.
फरा-9
लाउथाइनि जखा आरो खारथाइ
Measurement of Length and Motion
सोंथि बिदां
1. जौथं I नि मोनफ्रोमबो बेसादखौ जौथं II नि बयनिखुइबो आरजाथावसिन सानगुदिजों गोरोब हो।
| जौथं I | जौथं II |
|---|---|
(क) दालाननि जौथाइ |
(i) से.मि. |
(ख) मोननै नोगोरनि गेजेरनि जानथाइ |
(ii) मि. |
(ग) पेन्सिलनि लाउथाइ |
(iii) मि.मि. |
| (घ) लिरथुम बिजाबनि रोजाथि | (iv) कि.मि. |
फिननाय:-
| जौथं I | जौथं II |
|---|---|
(क) दालाननि जौथाइ |
(ii) मि. |
(ख) मोननै नोगोरनि गेजेरनि जानथाइ |
(iv) कि.मि. |
(ग) पेन्सिलनि लाउथाइ |
(i) से.मि. |
| (घ) लिरथुम बिजाबनि रोजाथि | (iii) मि.मि. |
2. गाहायाव होनायफोरनि लाउथाइनि जखाखौ माबे आरजाथाव आगजु (सेवारि एबा फिटा) बाहायनानै दिहुननो हायो?
फिननाय:-
(क) मोनसे दालाननि जौथाइ = फिटा
(ख) पेन्सिलानि लाउथाइ = सेवारि
(ग) खाखोर खेबथाबग्रानि लाउथाइ = सेवारि
(घ) दंफां-मोदोमनि सोरगिदिंसिमानि लाउथाइ = फिटा
(ङ) हुखोमोरग्रा राबारनि अरथाइ = सेवारि
(च) जोलुर गोलेग्रा फोथारनि लाउथाइ = फिटा
3. गेबें ना गोरोन्थि ?
a. 1 मि .= 100 से.मि.
फिननाय:- गेबें
b. 5000 मि .= 5 से.मि.
फिननाय:- गोरोन्थि
c. 2000 मि .= 2 से.मि.
फिननाय:- गोरोन्थि
d. घड़ी दाबुनि गिदिंनाया हांखोआरि खारथाइनि बिदिन्थि ।
फिननाय:- गोरोन्थि
e. गोथों हांखोआव खारनाय खारथाइखौ दिन्दौनाय खारथाइ होनना बुंनाय जायो।
फिननाय:- गोरोन्थि
4.गेबें फिननायनि बेंखनखौ गोसोम खालाम –
(i) गाहायनि बबेया फारिफिन खारथाइनि बिदिन्थि?
(ख) गोथों हांखोजों खारनाय गंसे बास
(ग) गंसे घड़िनि दिन्दौलानि दिन्दौनाय
(घ) गोग्लैबोनाय थोबसे बल
(ङ) सासे थाबायना थांनाय मानसि
फिननाय:- (ग) गंसे घड़िनि दिन्दौलानि दिन्दौनाय
(ii) गाहायनि बबेया बेंखनारि खारथाइनि बिदिन्थ?
(क) खारसुमै थासारियाव थानाय गंसे दिन्दौला
(ख) गंसे खारबाय थानाय रेलगाड़ी
(ग) सोलिबाय थानाय सिलिं गिसिबनि गांफोर
(घ) खारसुमै साइखेल गंसे
फिननाय:- (ग) सोलिबाय थानाय सिलिं गिसिबनि गांफोर
6. नोंनि न’ आरो फरायसालिनि गेजेरनि जानथाइया 2000 मिटार, बेखौ किल ‘मिटाराव फोरमाय।
7. दोंसे खुन्दुंनि हेफाजाबाव नोंनि सोरगिदिं थानाय बायदि बेसाद जेरै- पेन्सिल, खलम, भुमसु बागसु आरिनि लाउथाइनि जखा ला। मोनफ्रोमबो लाउथाइखौ मिलिमिटार आरो सेन्टिमिटाराव फोरमाय आरो खारिफोरखौ गांसे थख’लाइयाव लिरथुम।
फिननाय:-
| बेसादनि मुं | लाउथाइ (सेन्टिमिटाराव - cm) | लाउथाइ (मिलिमिटाराव - mm) |
|---|---|---|
पेन्सिल |
15 से: मि: | 150 मि: मि: |
खलम |
14 से: मि: | 140 मि: मि: |
भुमसु बागसु |
16 से: मि: | 160 मि: मि: |
हुखोमोरग्रा |
4 से: मि: | 40 मि: मि: |
8. नोंनि थाखो ख’थायाव गुबुन गुबुन बेसादफोरखौ नोजोर हो आरो गाहायाव होनाय बायदियै बेफोरखौ लाउथाइनि सायाव बिथा खालामनानै थाखो रान। 10 सेन्टिमिटारनिखुइ खम, 10 सेन्टिमिटारनिफ्राय 1 मिटारनि गेजेराव आरो 1 मिटारनिखुइ बांसिन। नोंनि नायबिजिरनायखौ आरजाथाव थख ‘लाइयाव लिरथुम।
फिननाय:-
| 10 से.मि. निखुइ खम | 10 से.मि. निफ्राय 1 मि. नि गेजेराव | 1 मिटारनिखुइ बांसिन |
|---|---|---|
चकनि थुख्रा |
बिजाब | बेन्च |
हुखोमोरग्रा |
दास्तार | दुलुरारि बर्ड |
| शार्पनार | पेन्सिल बागसु | थाखो ख'थानि दरजा |
9. नोंनि साथाम लोगोखौ गंसे इन्जुरनि सेराव गसंना थानो थिन। इन्जुराव बिसोरनि जौथाइखौ दागो हो। दानिया बिसोरनि जौथाइखौ सुनानै साफ्रोमनिबो जौथाइनि जखाखौ मिटार आरो सेन्टिमिटाराव फोरमाय।
10. नोंनि सोरगिदिंनि गुबुन गुबुन रोखोमनि खारथाइखौ सिनायथि हो। हांखोआरि, बेंखनारि आरो दिन्दौनाय खारथाइ मोनफ्रोमनिबो मोननैयै बिदिन्थि लिर।
फिननाय:-
1. हांखोआरि खारथाइ :
(i) बिफांनिफ्राय गोग्लैबोनाय थाइजौ फिथाइ।
(ii) गोथों लामाजों खारबाय थानाय रेलगाड़ी।
2. बेंखनारि खारथाइ :
(i) सोलिबाय थानाय सिलिं गिसिबनि गांफोर।
(ii) दिरुंजों खाथाबनानै फिदिंनाय बल।
3. दिन्दौनाय खारथाइ :
(i) घड़िनि दिन्दौला।
(ii) हैसा-मैसा आव गाखोनानै दिन्दौनाय गथ’।
11 गाहायनि सावगारिखौ नायनानै लांदां जायगाखौ आबुं खालाम।
फिननाय:-
| रिजायनाय बिन्दो | जानथाइ | जानथाइ |
|---|---|---|
प्रितम |
बिकाश निसिम = 3 m |
अनिमा निसिम = 3 m |
अनसुमै |
गारगि निसिम = 3 m |
प्रितम निसिम = 6 m |
अनिमा |
प्रितम निसिम = 3 m |
बिकाश निसिम = 6 m |
| गारगि | बिकास निसिम = 6 m | अनसुमै निसिम = 3 m |
11. (b)
फिननाय:-
| रिजाय बिन्दो | गुवाहाटीसिम जानथाइ |
|---|---|
A |
20 km |
B |
40 km |
C |
60 km |
D |
80 km |
| रहासिम जानथाइ | |
A |
100-20= 80 km |
B |
100-40=60 km |
C |
100-60=40 km |
| D | 100-80=20 km |
Note: If you find any mistakes in these questions and answers, you can tell us or correct it yourself.
जुदि नोंथाङा बेफोर सोंथिफोर आरो फिननायाव माबा गोरोन्थि मोनो, अब्ला नोंथाङा जोंनो खोन्थानो हागोन एबा गावनो बेखौ सुद्रायनो हागोन।
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FAQs:
Where can I get फरा-9 "लाउथाइनि जखा आरो खारथाइ" Class 6 Science Chapter-9 Question Answer?
You can get complete फरा-9 “लाउथाइनि जखा आरो खारथाइ” Class 6 Science Chapter-9 Question Answer on Bodoland Library.
Are the answers based on the latest syllabus?
Yes, all answers for फरा-9 “लाउथाइनि जखा आरो खारथाइ” are prepared according to the latest approved syllabus and textbook.
Is this chapter important for exams?
Yes, Chapter-9 is very important as it forms the base of the Science subject and may include questions in unit tests and final exams.