रसायन विज्ञान टॉप 20 क्विश्चन || chemistry top 20 question quiz in hindi - SMART-STUDY

SMART-STUDY

a blog about new pattern education quiz pdf for all competition exam government exam SSC bank railway mpsi vyapam police

NEW POST

Post Top Ad

Thursday, April 23, 2020

रसायन विज्ञान टॉप 20 क्विश्चन || chemistry top 20 question quiz in hindi

Q 1.परमाणु विखंडन रिएक्टर में निम्नलिखित में से किसकी आवश्यकता नहीं होती है?





... Answer is C)
Substances like graphite and heavy water are used as moderator to slow down the speed of neutrons. Cd or B are used as control rods to control rate of fission by absorbing neutrons. Coolant like heavy water or molten sodium is used to carry away the heat.।"


Q 2. गैस रिसाव का पता लगाने में मदद करने के लिए निम्न में से कौन सा एक एल महक एजेंट एलपीजी सिलेंडर में जोड़ा जाता है?





... Answer is B)
Ethyl mercaptan or thioethanol (C_2 H_5 SH) is added during filling of LPG cylinders. It is a strong-smelling compound and help in the detection of gas leakage. .


Q 3.एक शरीर पर नकारात्मक चार्ज है। इसका मतलब है कि-?





... Answer is B)
Atoms are neutral. When an atom loses electron, it becomes positively charged and when an atom gains electron, it becomes negatively charged and when an atom gains electron, it becomes negatively charged. Hence, a body is charged negatively when it has acquired some electrons from outside..

Q 4.कॉन्टैक्ट लेंस किस से बने होता हैं?





... Answer is C)
Contact lenses are made from Lucite. It is a polymer of methyl methacrylate. Th other names of Lucite are plexiglass, acrylate and Perspex. "


Q 5.एक α-कण में निम्नलिखित में से क्या होता है?





... Answer is A)
An α-particle is identical with helium nuclei. It consists of 2 protons and 2 neutron."


Q 6.निम्नलिखित में से कौन सा पदार्थ प्राकृतिक कच्चे माल से बना है? .





... Answer is A)
Rayon is made from naturally occurring cellulose. Rayon is also called artificial silk."


Q 7.आटा में बेकिंग सोडा मिलाने का उद्देश्य क्या है?





... Answer is D)
Baking soda has sodium bicarbonate as the chief constituent. It decomposes on heating giving carbon dioxide. This causes dough, cakes, biscuits etc. to expand and become light "


Q 8.निम्नलिखित में से कौन सा एक तत्व है?





... Answer is B)
Diamond is an element. It is an allotrope of carbon. While ruby, topaz and sapphire are minerals (i.e., compounds). These are the valuable gemstones."


Q 9. कार बैटरी में, किस इलेक्ट्रोलाइट पदार्थ का उपयोग किया जाता है?





... Answer is B)
Electrolyte substance used in a car battery is Sulphuric acid (H_2 SO_4 ). It is a strong acid."


Q 10. अक्सर मूत्रालयों के पास आने वाली एक तीखी गंध किसके कारण होती है?





... Answer is C)
Urine odour is caused by the presence of Ammonia. Urine is an aqueous solution of greater than 95% water. "


Q 11. चूहे मारने का जहर बनाने के लिए किस रासायनिक पदार्थ का उपयोग किया जाता है?





... Answer is C)
Potassium Cyanide (KCN) or Zinc Phosphide is a highly toxic chemical used as a rodenticide a poison to kill the mouse.."


Q 12. साबुन के निर्माण में निम्न में से कौन सा प्रयोग किया जाता है?





... Answer is A)
Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses glucose for energy and creates lactic acid as a by-product. It is the lactic acid which makes the milk sour. The presence of lactic acid or lactate in milk is due to the fermentation of lactose caused mainly by lactic bacteria."


Q 13. खाद्य सामग्री के संरक्षण में निम्न में से कौन से पदार्थ का उपयोग किया जाता है?





... Answer is C)
The chemical formula of Sodium Benzoate is NaC7H5O2. It is widely used as food preservative."


Q 14 .इनमें से कौन सा जीवाश्म ईंधन है?





... Answer is D)
Fossil fuels, including coal, oil and natural gas are currently the world’s primary energy sources."


Q 15 .साबुन से डिटर्जेंट का लाभ है-





... Answer is C)
Detergents give lather even with hard water while soaps give lather with only soft water"


Q 16 .डिटर्जेंट _____ सिद्धांत पर सतह की सफाई करता है.?





... Answer is B)
Detergents clean surfaces on the principle of surface tension. Detergents are soapless soap. They produce leather with soft water as well as hard water."


Q 17. तत्व जिसका उपयोग वाल्केनिंग रबर के लिए किया जाता है -





... Answer is A)
Vulcanisation is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulphur or other equivalent curatives or accelerators. By far the most common vulcanising methods depend on sulphur."


Q 18 .मोटर कार निकास से प्रदूषक जो मानसिक रोग का कारण बनता है?





... Answer is A)
Pollutant from motor car exhaust that causes mental disease is lead. Lead is produced cause lead poisoning."


Q 19. दो धातु आयन जो पानी में कठोरता के कारण होते हैं:





... Answer is A)
The bicarbonates, chlorides and sulphates of calcium and magnesium cause hardness to water. The bicarbonates cause temporary hardness while chlorides and sulphates cause permanent hardness"


Q 20 .पुलिस द्वारा इस्तेमाल किए जाने वाले ब्रीथ एनालाइजर का प्रयोग शराबी चालकों के ___________ के रासायनिक आधार पर कार्य करने के लिए किया जाता है?





... Answer is B)
Breath analysers used by police to test drunken drivers works on the chemical basis of Acid-base reactions."


No comments:

Post a Comment

Post Bottom Ad