Measurement of Time and Motion
CBSE · Class 7 · Science
Flashcards for Measurement of Time and Motion — CBSE Class 7 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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How was time measured before modern clocks and watches?
Answer
Time was measured using natural and mechanical timekeeping devices such as sundials, water clocks, hourglasses, candle clocks, pendulum clocks, quartz clocks, and atomic clocks. Early timekeeping used…
आधुनिक घड़ियों और घड़ी से पहले समय कैसे मापा जाता था?
Answer
समय को प्राकृतिक और यांत्रिक समय रखने वाले उपकरणों जैसे कि धूपघड़ी, पानी की घड़ियाँ, रेत घड़ी, मोमबत्ती घड़ी, पेंडुलम घड़ी, क्वार्ट्ज घड़ी और परमाणु घड़ी का उपयोग करके मापा जाता था। प्रारंभिक समय रखने…
What is a sundial?
Answer
A sundial is an ancient time measuring device that uses the shadow of an object cast by sunlight. It shows local or solar time, so a correction is needed to find Indian Standard Time.
घड़ी क्या होती है?
Answer
घड़ी एक प्राचीन समय मापने का उपकरण है जो सूर्य के प्रकाश द्वारा डाली गई किसी वस्तु की छाया का उपयोग करता है। यह स्थानीय या सौर समय दिखाता है, इसलिए भारतीय मानक समय खोजने के लिए एक सुधार की आवश्यकता हो…
Why does a sundial not give Indian Standard Time directly?
Answer
A sundial measures local solar time, which depends on the Sun's position at a place. Indian Standard Time is a standard time used for the whole country, so a correction is needed.
सूरजघड़ी सीधे भारतीय मानक समय क्यों नहीं देती है?
Answer
घड़ी स्थानीय सौर समय को मापती है, जो किसी स्थान पर सूर्य की स्थिति पर निर्भर करती है। भारतीय मानक समय पूरे देश के लिए इस्तेमाल किया जाने वाला मानक समय है, इसलिए इसमें सुधार की आवश्यकता है।…
What is a water clock?
Answer
A water clock is an ancient time measuring device that uses the flow of water out of or into a vessel to measure time.
जल घड़ी क्या होती है?
Answer
जल घड़ी एक प्राचीन समय मापने वाला उपकरण है जो समय को मापने के लिए किसी पात्र से बाहर या उसमें पानी के प्रवाह का उपयोग करता है।…
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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