Light: Shadows and Reflections — Flashcards
CBSE · Class 7 · Science
68 flashcards for Light: Shadows and Reflections (CBSE Class 7 Science) to test yourself on key terms and facts. Sample: "What is a luminous object?"
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What is a luminous object?
Answer
A luminous object emits its own light. The Sun, stars, lightning, natural fire, and certain animals are luminous objects.
दीप्तिमान वस्तु क्या होती है?
Answer
एक दीप्तिमान वस्तु अपना प्रकाश उत्सर्जित करती है। सूर्य, तारे, बिजली, प्राकृतिक अग्नि और कुछ जानवर दीप्तिमान वस्तुएँ हैं।…
Why is the Sun called the main source of natural light on Earth?
Answer
The Sun gives out its own light and lights up Earth during the day. It is the main source of natural light on Earth.
सूर्य को पृथ्वी पर प्राकृतिक प्रकाश का मुख्य स्रोत क्यों कहा जाता है?
Answer
सूर्य अपनी रोशनी देता है और दिन के समय पृथ्वी को प्रकाशित करता है। यह पृथ्वी पर प्राकृतिक प्रकाश का मुख्य स्रोत है।…
Is the Moon a luminous object?
Answer
No. The Moon is non-luminous. It does not produce its own light. It reflects sunlight that falls on it.
क्या चंद्रमा एक प्रकाशमान वस्तु है?
Answer
नहीं। चंद्रमा प्रकाशहीन है। यह स्वयं प्रकाश उत्पन्न नहीं करता है। यह अपने ऊपर पड़ने वाले सूर्य के प्रकाश को परावर्तित करता है।…
Why do fireflies glow at night?
Answer
Fireflies are seasonal insects that use light to communicate. Their light helps them send signals to other fireflies.
जुगनू रात में क्यों चमकते हैं?
Answer
जुगनू मौसमी कीट होते हैं जो प्रकाश का उपयोग करके संवाद करते हैं। उनकी रोशनी उन्हें अन्य जुगनू को संकेत भेजने में मदद करती 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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