UPTET 2019 | Important topics related Chemistry Questions | 18th December 2019

UPTET 2019 Exam Important Science Questions:

Today, we are providing you the Science Questions, which help you to command over this subjects.Taught many interesting science information and add some fun in a science teaching-learning process.This section is not only important for CTET 2019 Exam i.e UPTETREETHTET etc. So, we will provide you the questions which will help you in preparing for Exam.

Q1.Which of the following is a non-metal that remains liquid at room temperature?
निम्नलिखित में से क्या एक अधातु है जो कमरे के तापमान पर तरल रहता है?
(a) Chlorine/क्लोरीन
(b) Phosphorous/ फॉस्फोरस
(c) Bromine/ ब्रोमीन
(d) Helium/ हीलियम

Q2.Hydrogen bomb is based on the principle of  
हाइड्रोजन बम किस सिद्धांत पर आधारित है?
(a) Nuclear fission/नाभिकीय विखंडन
(b) Nuclear fusion/ नाभकीय संलयन
(c) Natural radioactivity/ प्राकृतिक रेडियोधर्मिता
(d) Artificial radioactivity/ कृत्रिम रेडियोधर्मिता

Q3. A mixture of sand and naphthalene can be separated by
रेत और नेफ़थलीन के मिश्रण को अलग किया जा सकता है:
(a) Fractional distillation/ प्रभाजी आसवन द्वारा
(b) Sublimation/ उर्ध्वपातन
(c) Chromatography / वर्णलेखन
(d) Any of them/ इनमें से कोई एक

Q4.What is the element present in urea
यूरिया में मौजूद तत्व क्या है?
(a) C,H,O
(b) C,N,O
(c) C,N,H
(d) C,O,N,H


Q5.Temporary hardness is due to the presence of 
अस्थाई कठोरता किसकी उपस्थिति के कारण होती है?
(a) Calcium carbonate/ कैल्शियम कार्बोनेट
(b) Calcium bicarbonate/ कैल्शियम बायकार्बोनेट
(c) Magnesium sulphate/ मैग्नीशियम सलफेट
(d) Calcium sulphate/ कैल्शियम सलफेट

Q6.When water freezes its density
जब पानी जम जाता है तो इसका घनत्व:
(a) Decreases / कम हो जाता है
(b) Remains constant/ स्थिर रहता है
(c) Increases / बढ़ जाता है
(d) Become zero/ शून्य हो जाता है


Q7.Which is the gas used for making vegetables and vanaspathi from vegetable oils?
वनस्पति तेलों से सब्जी और वनस्पती बनाने के लिए इस्तेमाल की जाने वाली गैस कौन-सी है?
(a) Hydrogen/ हाइड्रोजन
(b) Nitrogen/ नाइट्रोजन
(c) Argon/ आर्गन
(d) Helium/ हीलियम


Q8.Which one of the following is used to induce artificial rain?
कृत्रिम वर्षा करने के लिए निम्नलिखित में से किसका उपयोग किया जाता है?
(a) Potassium Nitrate/पोटैशियम नाइट्रेट
(b) Ammonium Chloride/ अमोनियम क्लोराइड
(c) Calcium Carbonate/ कैल्शियम कार्बोनेट
(d) Silver Iodide/ सिल्वर आयोडाइड


Q9.The bleeding of a wound is stopped by the application of ferric chloride because_________.
घाव का रक्तस्राव फेरिक क्लोराइड से रुक जाता है क्योंकि _________
(a) Ferric chloride seals the blood vessels / फेरिक क्लोराइड रक्त वाहिकाओं को बंद कर देता है
(b) Blood starts flowing in the opposite direction/ रक्त विपरीत दिशा में बहने लगता है
(c) Blood reacts and a solid is formed which seals the blood vessels/ रक्त प्रतिक्रिया करता है और एक ठोस बनता हैजो रक्त वाहिकाओं को सील करता है
(d) Blood is coagulated and the blood vessels are sealed/ रक्त जम जाता है और रक्त वाहिकाओं को बंद कर देता है

Q10.The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ?
शुगर के किस कार्बन परमाणु पर हाइड्रोक्सी समूह की उपस्थिति या अनुपस्थिति आरएनए और डीएनए को अलग करती है?
(a) 4th
(b) 2nd
(c) 3rd
(d) 1st

Solution

S1.Ans.(c)
Sol. Bromine is a non-metal that remains liquid at room temperature.

S2.Ans.(b)
Sol. Hydrogen Bomb is based on the principle of Nuclear Fusion. Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.

S3.Ans.(b)
Sol. The mixtures of solid substances with one sublime material and other non-sublime material can be separated by sublimation. Examples of sublime substances- ammonium chloride, camphor, iodine, naphthalene, anthracene etc.

S4.Ans.(d)
Sol. Urea is also known as carbamide, is a solid compound that contains nitrogen. Each atom urea contains: 1 carbon, 4 hydrogen, 2 nitrogen, 1 oxygen.

S6.Ans.(a)
Sol. When water freezes its density decreases.
Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point.
S7.Ans.(a)
Sol. Hydrogen gas is used for making vegetables and vanaspathi from vegetable oils.
As it is colorless, odourless, tasteless, flammable gaseous substance, it is added to oils to make them more solid or spreadable.
S8.Ans.(d)
Sol. The most common chemicals used for cloud seeding include silver iodide, potassium iodide and dry ice (solid carbon dioxide)
S9.Ans.(d)
Sol. Bleeding can be stopped by ferric chloride as ferric chloride coagulates the blood by which the blood vessel is sealed.
S10.Ans.(b)
Sol. RNA has hydroxy group attached at the 2nd C-atom while DNA does not.
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