Remember there are 18 Railway zones in India present time... In books There is written only 16 zones...

Did You Know
If you've ever dreamed about hiking to the end of the rainbow, we've got some bad news for you: you'd never get there. Rainbows are circular and have no end—they only appear as arches in our field of view due to the curvature of the Earth. If you ever see a rainbow from an airplane or other very high locations, you'll see the whole circle.

Domain name's

A person who weighs 45 kilograms on Earth would weigh about 3 kilograms on Pluto.

Android was originally created as an operating system for digital cameras.

McDonald's sells 1 ton of fries per minute.

The fuel consumption of the Bugatti Veyron SS at maximum speed is 125 liters per 100 kilometers.

In 1582 people went to bed on October 4th and woke up the next day on October 15th when Pope Gregory XIII introduced the Gregorian calendar to replace the Julian calendar.

The world’s once largest diamond, the Kohinoor, was inside the Taj Mahal and the British stole it when they conquered India. They haven’t returned it yet.

You will not be able to run away from the bear, its speed can reach 50 km/h.

0.06 seconds is the time it takes dogs to determine in which direction the sound source is located.

*✍️महत्त्वपूर्ण मात्रक / important units*

1. *एम्पियर (Ampere)* - विद्युत धारा (*Electric Current*)

2. *ओम (Ohm)* - विद्युत प्रतिरोध (*Electrical Resistance*)

3. *म्हो (Mho)* - विद्युत चालकता (*Electrical Conductance*)

4. *कैलोरी (Calorie)* - ऊष्मा (*Heat*) (CGS)

5. *कूलम्ब (Coulomb)* - विद्युत आवेश (*Electric Charge*)

6. *सेंटीग्रेड (Centigrade)* - तापमान (*Temperature*) (CGS)

7. *केल्विन (Kelvin)* - तापमान (*Temperature*) (SI)

8. *सेंटीमीटर (Centimeter)* - दूरी (*Distance*) (CGS)

9. *क्यूरी (Curie)* - रेडियो विखंडन (*Radioactivity*)

10. *रदरफोर्ड (Rutherford)* - रेडियो विखंडन (*Radioactivity*)

*🇮🇳प्रमुख धातु तत्त्व एवं उनके अयस्क/Major metal elements and their ores*



*1. लोहा का अयस्क है? / Iron ore is?*
*Ans:* मेग्नेटाइट, हेमटाइट | Magnetite, Hematite

*2. तांबा का अयस्क है? / Copper ore is?*
*Ans:* कॉपर पायराइट, मेलेकाइट | Copper Pyrite, Malachite

*3. कैल्सियम का अयस्क है? / Calcium ore is?*
*Ans:* डोलोमाइट, जिप्सम | Dolomite, Gypsum

*4. मैग्नेशियम का अयस्क है? / Magnesium ore is?*
*Ans:* डोलोमाइट, मैग्नेशियम | Dolomite, Magnesium

*5. पारा (मरकरी) का अयस्क है? / Mercury ore is?*
*Ans:* सिनेबार | Cinnabar

*6. सीसा (लेड) का अयस्क है? / Lead ore is?*
*Ans:* गेलेना | Galena

*7. थोरियम का अयस्क है? / Thorium ore is?*
*Ans:* मोनोजाइट | Monazite

*8. सोडियम (Na) का अयस्क है? / Sodium ore is?*
*Ans:* चिली साल्टपीटर | Chile Saltpeter

*9. पोटैशियम (K) का अयस्क है? / Potassium ore is?*
*Ans:* बोरेक्स, साधारण नमक | Borax, Common Salt

*10. चांदी (Ag) का अयस्क है? / Silver ore is?*
*Ans:* रूबी सिल्वर, हॉर्न सिल्वर | Ruby Silver, Horn Silver

*11. सोना (Au) का अयस्क है? / Gold ore is?*
*Ans:* बिस्मथ ऑराइट, कॉलवेराइट | Bismuth Orite, Colverite

*12. जिंक (Zn) का अयस्क है? / Zinc ore is?*
*Ans:* कालामाइन, जिंकाइट | Calamine, Zincite

*13. एल्युमिनियम का अयस्क है? / Aluminum ore is?*
*Ans:* बॉक्साइट, कोरंडम | Bauxite, Corundum

*14. यूरेनियम (U) का अयस्क है? / Uranium ore is?*
*Ans:* पिच ब्लेड | Pitchblende

*15. मैगनीज (Mn) का अयस्क है? / Manganese ore is?*
*Ans:* सिलोमीलिन, पाइरोलयुसाइट | Silomelin, Pyrolusite

*16. कोबाल्ट (Co) का अयस्क है? / Cobalt ore is?*
*Ans:* स्मेल्टाइट | Smaltite

*17. निकेल (Ni) का अयस्क है? / Nickel ore is?*
*Ans:* मिलेराइट | Millerite

Did You Know
Eye color is the result of melanin (or lack thereof) in the irises of your eyes. Dark brown eyes have the most melanin and very light blue eyes have the least. There's even a laser-based cosmetic surgical procedure that will break up the melanin and turn brown eyes blue.