Sunday, January 5, 2025
8.1a) How big is the sky?
How big is the sky?
आकाश कितना बड़ा है?
✍👉The sky, in terms of Earth's atmosphere, extends about 100 kilometers (62 miles) above the surface, where it gradually transitions into space. Beyond this, the observable universe stretches about 46.5 billion light-years in all directions, though the true extent of the universe is still unknown.
आकाश, पृथ्वी के वायुमंडल के संदर्भ में, सतह से लगभग 100 किलोमीटर (62 मील) ऊपर फैला हुआ है, जहां यह धीरे-धीरे अंतरिक्ष में संक्रमण करता है। इसके अलावा, अवलोकन योग्य ब्रह्मांड सभी दिशाओं में लगभग 46.5 बिलियन प्रकाश-वर्ष तक फैला है, हालांकि ब्रह्मांड की वास्तविक सीमा अभी भी अज्ञात है।
Here is a detailed illustration showing the vastness of the sky with various components: fluffy clouds, birds flying, a rainbow, sunbeams, stars, planets, and an airplane at high altitude. It represents the dynamic and layered nature of the sky.
✍👉 Prosperous team
7.3j) What is a complete circuit? Give the example.
What is a complete circuit? Give the example.
एक पूर्ण सर्किट क्या है? उदाहरण दीजिए।
✍👉Complete Circuit
A complete circuit is a closed-loop electrical path where current can flow continuously from a power source, through conductive wires, and back to the source, powering a load in the process.
Example
A simple flashlight circuit: When the switch is turned on, the battery provides power, current flows through the bulb (load), and the bulb lights up, completing the circuit.
**पूरा सर्किट**
एक पूर्ण सर्किट एक बंद-लूप विद्युत पथ है जहां करंट एक शक्ति स्रोत से, प्रवाहकीय तारों के माध्यम से, और स्रोत पर वापस प्रवाहित हो सकता है, प्रक्रिया में लोड को शक्ति प्रदान करता है।
Here is a diagram of a complete circuit, showing a battery, wires forming a closed loop, a switch in the "on" position, and a glowing light bulb.**उदाहरण**
एक साधारण टॉर्च सर्किट: जब स्विच चालू होता है, तो बैटरी बिजली प्रदान करती है, बल्ब (लोड) के माध्यम से करंट प्रवाहित होता है, और बल्ब रोशनी करता है, सर्किट को पूरा करता है।
✍👉 Prosperous team
7.3i) Why should we cover the naked wires with insulating tape?
Why should we cover the naked wires with insulating tape?
हमें इन्सुलेट टेप के साथ नग्न तारों को क्यों कवर करना चाहिए?
✍👉Covering naked wires with insulating tape prevents electric shocks, short circuits, and fires by providing a protective barrier against live conductors. It ensures safety and prevents accidents.
इन्सुलेट टेप के साथ नग्न तारों को कवर करना लाइव कंडक्टरों के खिलाफ एक सुरक्षात्मक बाधा प्रदान करके बिजली के झटके, शॉर्ट सर्किट और आग को रोकता है। यह सुरक्षा सुनिश्चित करता है और दुर्घटनाओं को रोकता है।
✍👉 Prosperous team
7.3h) Why shouldn't we touch electric wire with bare hands?
Why shouldn't we touch electric wire with bare hands?
हमें नंगे हाथों से बिजली के तार को क्यों नहीं छूना चाहिए?
✍👉Touching electric wires with bare hands can cause electric shocks, burns, or even death, as bare hands provide no protection against live current. Always use insulated tools for safety.
नंगे हाथों से बिजली के तारों को छूने से बिजली के झटके, जलन या यहां तक कि मौत भी हो सकती है, क्योंकि नंगे हाथ लाइव करंट से कोई सुरक्षा नहीं देते हैं। सुरक्षा के लिए हमेशा इंसुलेटेड टूल्स का इस्तेमाल करें।
Here is a diagram illustrating the danger of touching an electric wire with bare hands. It highlights the risks of electric shock and burns.
✍👉 Prosperous team
7.3g) Write down any five uses of electricity in our daily life.
Write down any five uses of electricity in our daily life.
अपने दैनिक जीवन में विद्युत के कोई पाँच उपयोग लिखिए।
✍👉Five Uses of Electricity in Daily Life
- Lighting: Powers bulbs, lamps, and LEDs to illuminate spaces.
- Appliances: Runs devices like refrigerators, microwaves, and washing machines.
- Communication: Supports phones, computers, and internet services.
- Transportation: Powers electric vehicles, trains, and traffic signals.
- Entertainment: Operates TVs, gaming consoles, and sound systems.
✍👉 Prosperous team
7.3f) What are safety rules which should be followed while using electricity?
What are safety rules which should be followed while using electricity?
बिजली का उपयोग करते समय सुरक्षा नियम क्या हैं?
✍👉Safety Rules for Using Electricity
- Avoid Overloading: Do not overload outlets or circuits.
- Dry Hands: Never touch electrical appliances with wet hands.
- Inspect Wires: Check for damaged cords and replace them.
- Turn Off Power: Switch off appliances when not in use.
- Use Proper Equipment: Only use insulated tools and certified devices.
- Stay Grounded: Ensure proper grounding of electrical systems.
- Keep Water Away: Avoid placing electrical devices near water.
- Childproofing: Use safety covers on outlets around children.
- Professional Repairs: Call qualified electricians for complex issues.
- Emergency Preparedness: Know how to turn off the main power supply.
✍👉 Prosperous team
7.3e) Write down differences between a closed circuit and an open circuit.
Write down differences between a closed circuit and an open circuit.
एक बंद सर्किट और एक खुले सर्किट के बीच अंतर लिखें।
✍👉Differences Between Closed Circuit and Open Circuit
Aspect | Closed Circuit | Open Circuit |
---|---|---|
Continuity | Complete path for current flow. | Path is broken, no current flow. |
Current Flow | Current flows through the circuit. | No current flows due to the break. |
Switch Position | Switch is closed (on). | Switch is open (off). |
Operation | Devices (e.g., bulbs) function. | Devices do not function. |
Example | Working light circuit. | Light circuit with an open switch. |
✍👉 Prosperous team
7.3d) Define closed circuit and draw its diagram.
Define closed circuit and draw its diagram.
बंद परिपथ को परिभाषित कीजिए तथा इसका आरेख खींचिए।
✍👉Closed Circuit
A closed circuit is a complete electrical loop where current flows uninterrupted from the power source, through the load, and back to the source.
Key Parts:
- Power Source: Supplies energy (e.g., a battery).
- Conductors: Wires to carry current.
- Load: A device (e.g., bulb) that consumes electrical energy.
- Closed Path: No breaks in the circuit, allowing current to flow.
✍👉 Prosperous team
7.3c) What is an open circuit? Draw its diagram and show important parts.
What is an open circuit? Draw its diagram and show important parts.
ओपन सर्किट क्या है? इसका आरेख खींचिए और इसके महत्वपूर्ण भाग दिखाइए।
✍👉Open Circuit
An open circuit is an electrical circuit where the continuity is broken, preventing current from flowing. This can happen due to a broken wire, an open switch, or a disconnected component.
Key Parts:
- Power Source: Battery or supply.
- Conductors: Wires for connection.
- Load: A device (e.g., bulb) that would operate if the circuit were closed.
- Open Gap: A switch or break in the circuit.
✍👉 Prosperous team
7.3b) What things are necessary to make an electric circuit?
What things are necessary to make an electric circuit?
विद्युत परिपथ बनाने के लिए कौन सी चीजें आवश्यक हैं?
✍👉To make an electric circuit, you need:
- Power Source: e.g., battery or power supply.
- Conductive Path: Wires to carry current.
- Load: Devices like bulbs or resistors to use the electricity.
- Control Device (optional): Switches to regulate current.
- Connectors: To join components securely.
- Protective Components (optional): Fuses or diodes for safety.
That's the core of any functional circuit!
If we'd like to expand further, we can consider the following additions to make the circuit more functional or advanced:
- Additional Components: Resistors, capacitors, transistors, or integrated circuits for specific behaviors.
- Insulation: To prevent short circuits and enhance safety.
- Circuit Board: Breadboards for prototyping or printed circuit boards (PCBs) for permanent builds.
- Testing Tools: Multimeters or oscilloscopes to verify functionality.
✍👉 Prosperous team
W ✍👉 ✍👉 Prosperous team
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