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Practice Questions (30 of 384)

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  1. What is 'Amalgam'?
    'अमलगम' (Amalgam) क्या है?
    (A) An alloy of gold
    (B) An alloy containing Mercury
    (C) A type of iron
    (D) A polymer
    ✅ Answer & Explanation
    Sahi jawab: B) An alloy containing Mercury
    Explanation: Amalgam mercury (paara) aur anya dhaatuon ka mishran hota hai, jiska upyog dental filling me hota hai.
  2. Which refining process is used to obtain 'Ultra-pure' Semiconductors like Silicon and Germanium?
    सिलिकॉन और जर्मेनियम जैसे 'अति-शुद्ध' अर्धचालक प्राप्त करने के लिए किस शोधन प्रक्रिया का उपयोग किया जाता है?
    (A) Distillation
    (B) Zone Refining
    (C) Liquation
    (D) Electrolytic Refining
    ✅ Answer & Explanation
    Sahi jawab: B) Zone Refining
    Explanation: Zone refining is siddhant par aadharit hai ki ashuddhiyan solid state ki tulna me molten melt me adhik ghulansheel hoti hain.
  3. The 'Mond Process' is specifically used for the extraction and refining of which metal?
    'मॉन्ड प्रक्रम' (Mond Process) का उपयोग विशेष रूप से किस धातु के निष्कर्षण और शोधन के लिए किया जाता है?
    (A) Iron
    (B) Nickel
    (C) Copper
    (D) Aluminum
    ✅ Answer & Explanation
    Sahi jawab: B) Nickel
    Explanation: Nickel ko Carbon Monoxide ke saath react karwake volatile Nickel Carbonyl banate hain, jise decompose karke shuddh Nickel milta hai.
  4. Which method is used for the refining of Zirconium (Zr) and Titanium (Ti)?
    ज़िरकोनियम (Zr) और टाइटेनियम (Ti) के शोधन के लिए किस विधि का उपयोग किया जाता है?
    (A) Van Arkel Method
    (B) Cupellation
    (C) Poling
    (D) Froth Floatation
    ✅ Answer & Explanation
    Sahi jawab: A) Van Arkel Method
    Explanation: Van Arkel method me dhaatu ko volatile iodide me badal kar tungsten filament par decompose karke ultra-pure dhaatu prapt ki jaati hai.
  5. What is the chemical formula of 'Rust'?
    'जंग' (Rust) का रासायनिक सूत्र क्या है?
    (A) FeO
    (B) Fe2O3
    (C) Fe2O3 . xH2O
    (D) Fe3O4
    ✅ Answer & Explanation
    Sahi jawab: C) Fe2O3 . xH2O
    Explanation: Rust hydrated ferric oxide hota hai, jo iron ke oxygen aur nami ke sampark me aane par banta hai.
  6. Which 'Allotrope' of Phosphorus is the most reactive and glows in the dark (Chemiluminescence)?
    फास्फोरस का कौन सा 'अपररूप' सबसे अधिक क्रियाशील है और अंधेरे में चमकता है?
    (A) Red Phosphorus
    (B) Black Phosphorus
    (C) White Phosphorus
    (D) Violet Phosphorus
    ✅ Answer & Explanation
    Sahi jawab: C) White Phosphorus
    Explanation: White phosphorus atyadhik asankrit aur reactive hota hai, isliye ise hawa se bachane ke liye paani ke andar rakha jaata hai.
  7. The 'Contact Process' is used for the industrial production of which acid?
    'संपर्क प्रक्रम' (Contact Process) का उपयोग किस अम्ल के औद्योगिक उत्पादन के लिए किया जाता है?
    (A) Hydrochloric Acid
    (B) Nitric Acid
    (C) Sulfuric Acid
    (D) Phosphoric Acid
    ✅ Answer & Explanation
    Sahi jawab: C) Sulfuric Acid
    Explanation: Sulfuric acid ka utpadan Sulfur Dioxide ko Sulfur Trioxide me catalytically oxidize karke kiya jaata hai.
  8. Which non-metal is used in the 'Vulcanization' of rubber to give it elasticity and strength?
    रबर को लोच और मजबूती देने के लिए उसके 'वल्कनीकरण' (Vulcanization) में किस अधातु का उपयोग किया जाता है?
    (A) Carbon
    (B) Silicon
    (C) Sulfur
    (D) Phosphorus
    ✅ Answer & Explanation
    Sahi jawab: C) Sulfur
    Explanation: Sulfur natural rubber ke polymer chains ke beech cross-links banata hai, jisse uski taakat aur elasticity badhti hai.
  9. What is 'Anodizing'?
    'एनोडीकरण' (Anodizing) क्या है?
    (A) Coating iron with Zinc
    (B) Forming a thick oxide layer on Aluminum
    (C) Refining Copper
    (D) Making alloys
    ✅ Answer & Explanation
    Sahi jawab: B) Forming a thick oxide layer on Aluminum
    Explanation: Anodizing electrolysis ke dwara aluminum par ek moti, sanksharan-rodhi oxide parat banane ki prakriya hai.
  10. Which metal is the 'Main Constituent' of the alloy Duralumin?
    मिश्र धातु ड्यूराStateManagerलिन (Duralumin) का 'मुख्य घटक' कौन सी धातु है?
    (A) Copper
    (B) Aluminum
    (C) Magnesium
    (D) Manganese
    ✅ Answer & Explanation
    Sahi jawab: B) Aluminum
    Explanation: Duralumin me lagbhag 95% Aluminum hota hai aur iska upyog aerospace aur vimaan udyog me hota hai.
  11. The 'Self-reduction' process is typically used for the extraction of which metal?
    'स्व-अपचयन' (Self-reduction) प्रक्रिया का उपयोग आमतौर पर किस धातु के निष्कर्षण के लिए किया जाता है?
    (A) Iron
    (B) Sodium
    (C) Copper
    (D) Aluminum
    ✅ Answer & Explanation
    Sahi jawab: C) Copper
    Explanation: Copper jaise kam reactive sulfide ores garam karne par apne hi oxide dwara reduce ho jaate hain.
  12. What is 'Flowers of Sulfur'?
    'सल्फर के फूल' (Flowers of Sulfur) क्या है?
    (A) A type of plant
    (B) Fine powder of Sulfur obtained by sublimation
    (C) Liquid Sulfur
    (D) Sulfur ore
    ✅ Answer & Explanation
    Sahi jawab: B) Fine powder of Sulfur obtained by sublimation
    Explanation: Sublimation prakriya se prapt sulfur ke baareek powder ko Flowers of Sulfur kaha jaata hai, jo aushadhiyon me upyogi hai.
  13. Which 'Alloy' is used in making surgical instruments?
    सर्जिकल उपकरण बनाने में किस 'मिश्र धातु' का उपयोग किया जाता है?
    (A) Brass
    (B) Bronze
    (C) Stainless Steel
    (D) Duralumin
    ✅ Answer & Explanation
    Sahi jawab: C) Stainless Steel
    Explanation: Stainless steel sanksharan (rusting) ke prati pratirrodhi hoti hai, isliye surgical tools me use hoti hai.
  14. Which chemical is known as 'Quicksilver'?
    किस रसायन को 'क्विकसिल्वर' के रूप में जाना जाता है?
    (A) Silver
    (B) Mercury
    (C) Lead
    (D) Zinc
    ✅ Answer & Explanation
    Sahi jawab: B) Mercury
    Explanation: Mercury room temperature par ekmatra taral dhaatu hai aur iski silver-like chamak ke kaaran ise Quicksilver kehte hain.
  15. Which non-metal is used in 'Safety Matches'?
    'सुरक्षा माचिस' में किस अधातु का उपयोग किया जाता है?
    (A) White Phosphorus
    (B) Red Phosphorus
    (C) Sulfur
    (D) Carbon
    ✅ Answer & Explanation
    Sahi jawab: B) Red Phosphorus
    Explanation: Matchbox ke striking surface par Red Phosphorus lagaya jaata hai kyunki ye White Phosphorus se kam vishakt aur surakshit hota hai.
  16. The process of 'Liquation' is used for refining metals with:
    'द्रवगलन' (Liquation) की प्रक्रिया का उपयोग किन धातुओं के शोधन के लिए किया जाता है?
    (A) High boiling points
    (B) Low melting points (like Tin/Lead)
    (C) Magnetic properties
    (D) High density
    ✅ Answer & Explanation
    Sahi jawab: B) Low melting points (like Tin/Lead)
    Explanation: Kam galnaank wali dhaatuen sloping hearth par pighalkar ashuddhiyon se alag beh jaati hain.
  17. Which gas is released when 'Aluminum' reacts with Sodium Hydroxide ($NaOH$)?
    जब 'एल्यूमीनियम' सोडियम हाइड्रोक्साइड ($NaOH$) के साथ प्रतिक्रिया करता है तो कौन सी गैस निकलती है?
    (A) Oxygen
    (B) Hydrogen
    (C) Nitrogen
    (D) Chlorine
    ✅ Answer & Explanation
    Sahi jawab: B) Hydrogen
    Explanation: Aluminum jaise amphoteric dhaatu strong bases ke saath react karke sodium aluminate aur hydrogen gas banate hain.
  18. What is the 'Flux' used in the extraction of Copper to remove Iron oxide ($FeO$)?
    कॉपर के निष्कर्षण में आयरन ऑक्साइड ($FeO$) को हटाने के लिए किस 'गालक' (Flux) का उपयोग किया जाता है?
    (A) Limestone
    (B) Silica ($SiO_2$)
    (C) Coke
    (D) Magnesium
    ✅ Answer & Explanation
    Sahi jawab: B) Silica ($SiO_2$)
    Explanation: Silica acidic flux ke roop me basic FeO ke saath react karke iron silicate ($FeSiO_3$) slag banata hai.
  19. Which 'Alloy' is used to make coins and is composed of Copper and Nickel?
    सिक्के बनाने के लिए इस्तेमाल की जाने वाली मिश्र धातु कौन सी है जो कॉपर और निकेल से बनी होती है?
    (A) Brass
    (B) Bronze
    (C) Cupro-nickel
    (D) German Silver
    ✅ Answer & Explanation
    Sahi jawab: C) Cupro-nickel
    Explanation: Cupro-nickel sanksharan ke prati bohot pratirrodhi hoti hai aur silver-colored coins banane me upyog hoti hai.
  20. What is 'Dead Burnt Plaster'?
    'मृत दग्ध प्लास्टर' (Dead Burnt Plaster) क्या है?
    (A) Plaster of Paris
    (B) Anhydrous Calcium Sulfate ($CaSO_4$)
    (C) Gypsum
    (D) Limestone
    ✅ Answer & Explanation
    Sahi jawab: B) Anhydrous Calcium Sulfate ($CaSO_4$)
    Explanation: Gypsum ko 200°C se upar garam karne par poora jal nikal jaata hai aur anhydrous CaSO4 banta hai jo paani ke saath jamta nahi.
  21. Which 'Metal' is used in the 'Photoelectric Cell' because it emits electrons easily when exposed to light?
    'प्रकाश-विद्युत सेल' में किस धातु का उपयोग किया जाता है क्योंकि यह प्रकाश के संपर्क में आने पर आसानी से इलेक्ट्रॉनों का उत्सर्जन करती है?
    (A) Iron
    (B) Cesium
    (C) Zinc
    (D) Copper
    ✅ Answer & Explanation
    Sahi jawab: B) Cesium
    Explanation: Cesium ka ionization potential bohot kam hota hai, jisse ye visible light me aasaani se electrons emit karta hai.
  22. The 'Pitting Corrosion' is most commonly seen in which material?
    'पिटिंग जंग' (Pitting Corrosion) सबसे अधिक किस सामग्री में देखी जाती है?
    (A) Copper
    (B) Aluminum
    (C) Stainless Steel
    (D) Gold
    ✅ Answer & Explanation
    Sahi jawab: C) Stainless Steel
    Explanation: Pitting corrosion stainless steel me local passive film tootne par banti hai jisse chote-chote gaddhe (pits) pad jaate hain.
  23. Which of the following is considered a 'Noble Metal' due to its resistance to oxidation and corrosion?
    ऑक्सीकरण और जंग के प्रति अपने प्रतिरोध के कारण निम्नलिखित में से किसे 'उत्कृष्ट धातु' माना जाता है?
    (A) Iron
    (B) Platinum
    (C) Aluminum
    (D) Magnesium
    ✅ Answer & Explanation
    Sahi jawab: B) Platinum
    Explanation: Platinum, Gold aur Silver atyadhik kam reactive hote hain aur prakriti me mukt avastha me paaye jaate hain.
  24. What is the primary cause of 'Minamata Disease' discovered in Japan?
    जापान में खोजी गई 'मिनीमाता बीमारी' का मुख्य कारण क्या था?
    (A) Lead poisoning
    (B) Mercury poisoning
    (C) Cadmium poisoning
    (D) Arsenic poisoning
    ✅ Answer & Explanation
    Sahi jawab: B) Mercury poisoning
    Explanation: Industrial waste dwara paani me Methylmercury ke pravah aur machhliyon me bioaccumulation se Minamata rog faila tha.
  25. Which metal is used in 'Bulletproof' glass and armor plating due to its high strength-to-weight ratio?
    उच्च शक्ति-से-भार अनुपात के कारण बुलेटप्रूफ ग्लास और कवच प्लेटिंग में किस धातु का उपयोग किया जाता है?
    (A) Lead
    (B) Titanium
    (C) Boron
    (D) Beryllium
    ✅ Answer & Explanation
    Sahi jawab: B) Titanium
    Explanation: Titanium steel jitni strong aur wajan me kafi halki hone ke kaaran defence armor plating me upyog hoti hai.
  26. Which disease is caused by chronic 'Cadmium' poisoning, leading to brittle bones and joint pain?
    लंबे समय तक 'कैडमियम' के विषाक्त प्रभाव से कौन सा रोग होता है, जिससे हड्डियां कमजोर और जोड़ों में दर्द होता है?
    (A) Minamata
    (B) Itai-Itai
    (C) Wilson's Disease
    (D) Siderosis
    ✅ Answer & Explanation
    Sahi jawab: B) Itai-Itai
    Explanation: Cadmium poisoning se Japan ke Jinzu river basin me Itai-Itai bimari hui thi, jisme asthi-mriduta (osteomalacia) hoti hai.
  27. What is 'Misch Metal' primarily composed of?
    'मिश धातु' (Misch Metal) मुख्य रूप से किससे बनी होती है?
    (A) Iron and Copper
    (B) Lanthanide metals and Iron
    (C) Aluminum and Magnesium
    (D) Gold and Silver
    ✅ Answer & Explanation
    Sahi jawab: B) Lanthanide metals and Iron
    Explanation: Misch metal me lagbhag 95% Lanthanide metals (mukhya roop se Cerium) aur 5% Iron hota hai, jo flints me use hoti hai.
  28. Which heavy metal is most commonly found in 'Lead Storage Batteries' used in households?
    घरों में इस्तेमाल होने वाली लेड स्टोरेज बैटरियों में कौन सी भारी धातु पाई जाती है?
    (A) Cadmium
    (B) Lead (Pb)
    (C) Lithium
    (D) Nickel
    ✅ Answer & Explanation
    Sahi jawab: B) Lead (Pb)
    Explanation: Lead-acid batteries me lead plates aur lead dioxide ka upyog sulfuric acid electrolyte ke saath kiya jaata hai.
  29. Which metal is known as the 'Strategic Metal' because it is vital for a country's defense and economy?
    किस धातु को 'रणनीतिक धातु' (Strategic Metal) कहा जाता है क्योंकि यह रक्षा और अर्थव्यवस्था के लिए महत्वपूर्ण है?
    (A) Gold
    (B) Titanium
    (C) Iron
    (D) Sodium
    ✅ Answer & Explanation
    Sahi jawab: B) Titanium
    Explanation: Titanium, Chromium aur Zirconium ko aerospace aur military mahatva ke kaaran strategic metals kaha jaata hai.
  30. The 'Plumbism' medical condition refers to the poisoning caused by which metal?
    'प्लंबिज्म' (Plumbism) चिकित्सीय स्थिति किस धातु के कारण होने वाले विषाक्तता को संदर्भित करती है?
    (A) Mercury
    (B) Lead
    (C) Arsenic
    (D) Copper
    ✅ Answer & Explanation
    Sahi jawab: B) Lead
    Explanation: Lead ke Latin naam 'Plumbum' se is bimari ko Plumbism kaha jaata hai, jo nerve damage aur anemia ka kaaran banti hai.
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