Chemistry Questions for Railway & SSC CGL Exam 2018: 10th November 2018

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Q1.  Xeric condition refers to- 
जेरिक कंडीशन क्या संदर्भित करता है?
(a) low temperature / निम्न तापमान 
(b) low humidity / निम्न आर्द्रता
(c) high evaporation  / उच्च वाष्पीकरण
(d) extreme temperature / चरम तापमान 
Show Answer
Sol. Xeric condition refers to low humidity. Xeric environment is place where water is meager

Q2.  The temperature of the filament of lighted electric bulb is generally:
प्रकाशमान इलेक्ट्रिक बल्ब के फिलामेंट का तापमान सामान्यतः होता है:
(a) 100°C to 500°C
(b) 1000°C to 1500°C
(c) 2000°C to 2500°C
(d) 4000°C to 5000°C

Show Answer
Sol. Tungsten metal is used as filament in electric bulb. When electric current flows through it, its temperature goes up to 2500°C from 1500°C. Generally, electric bulbs convert only 5% to 10% of electric energy to light.

Q3. In a three-pin electrical plug longest pin should be connected to
एक तीन-पिन विद्युत प्लग में सबसे लम्बा पिन किससे जुड़ा होना चाहिए? 
(a) Ground terminal / ग्राउंड टर्मिनल
(b) Live terminal / लाइव टर्मिनल
(c) Neutral terminal / न्यूट्रल टर्मिनल
(d) Any terminal / कोई भी टर्मिनल

Show Answer
Sol. In the three-pin plug, there are three ends namely live, neutral and earth. The earth pin on a plug is longer than the line and neutral pins. This means the earth pin is the first to connect and last to disconnect for safety of electrical device. It provides an alternative and easy path for leakage or fault current flow.

Q4. The electric current does not flow between two properly connected charged bodies if they are having 
अच्छी तरह जुड़े दो चार्ज निकायों के बीच विद्युत प्रवाह नहीं होता है, यदि उनमें/उनका:
(a) Same charge /आवेश समान होता है
(b) Same capacity / क्षमता समान होता है
(c) Same resistivity / प्रतिरोधकता समान होता है
(d) Same potential /विभव समान होता है

Show Answer
Sol. According to Ohm’s law, if there is a potential difference (V) across a resistor then there is a current (I) flowing through it. Current flows in a circuit as a result of difference in potential between two points in the circuit.

Q5. Which of the following has the longest wavelength? 
निम्न में से किसका तरंगदैर्ध्य सबसे लंबा है?
(a) Infrared / इन्फ्रारेड
(b) X-rays / एक्स-किरणें
(c) Visible light / दृश्यमान प्रकाश
(d) Radio waves/ रेडियो तरंगें

Show Answer
Sol. The electromagnetic spectrum consists of all the different wavelength of electromagnetic radiations such as: Radiowaves > Microwave > Infrared > Visible > Ultraviolet > X-rays > Gamma rays. Thus it is clear that the radio-waves are having the maximum wavelength while the Gamma rays are having minimum wavelength.

Q6. In which of the following states maximum iron ore is found? 
निम्नलिखित में से किस में अधिकतम लौह अयस्क पाया जाता है? 
(a) FeCO
(b) FeO 
(c) FeO 
(d) FeS

Show Answer
Sol. Hematite (Fe₂O₃) .

Q7. “All the four quantum numbers of two electrons in an atom are not the same.” It is the law of – 
“परमाणु में दो इलेक्ट्रॉनों की सभी चार क्वांटम संख्या समान नहीं हैं।” यह नियम किसका है?
(a) Hund’s  / हुंड
(b) Exclusion Principle of Pauli / पाउली का अपवर्जन का नियम
(c) Uncertainty Principle of Hiesenberg / हाइजेनबर्ग अनिश्चितता के सिद्धांत
(d) Avogadro’s Law / अवोगाद्रो का नियम
Show Answer
Sol. The Pauli exclusion principle is the quantum mechanical principle that no two identical fermions (particles with half-integer spin) may occupy the same quantum state simultaneously. A more rigorous statement is that the total wave function for two identical fermions is anti-symmetric with respect to exchange of the particles. For example, no tow electrons in a single atom can have the same four quantum numbers; if n, 1, and ml are the same, ms must be different such that the electrons have opposite spins. 
Q8.  The gas used for artificial fruit ripening of green fruit is –
हरे फल को कृत्रिम फल बनाने के लिए उपयोग की जाने वाली गैस कौन सी है?
(a) Ethylene/ एथिलीन
(b) Acetylene / एसिटिलीन
(c) Ethane / एटैन
(d) Methane / मीथेन
Show Answer
Sol. Ethylene is also an important natural plant hormone, and is used in agriculture to force the ripening of fruits.
Q9. Fertiliser having high nitrogen content is: 
उच्च नाइट्रोजन सामग्री वाले कौन सा उर्वरक है?
(a) Urea / यूरिया
(b) Ammonium sulphate / अमोनियम सल्फेट
(c) Ammonium nitrate / अमोनियम नाइट्रेट
(d) Calcium citrate / कैल्शियम साइट्रेट
Show Answer
Sol.  Ammonium nitrate

Q10. What is untrue for bleaching powder? / ब्लीचिंग पाउडर के लिए असत्य क्या है?
(a) It is more soluble than water / यह पानी की तुलना में अधिक घुलनशील है
(b) It is powder of light yellow colour / यह हल्के पीले रंग का पाउडर है
(c) It is oxidant / यह ऑक्सीडेंट है
(d) It releases chlorine after reaction with dilute acid / यह डाइलूट एसिड के साथ प्रतिक्रिया के बाद क्लोरीन जारी करता है
Show Answer
Sol. Calcium Hypochlorite or Calcium Oxychloride is an inorganic compound. It is also known as bleaching powder. Its chemical formula is Ca(OCl) Cl. It is a white solid, although commercial samples appear yellow. Bleaching powder is used for water treatment and acts as a bleaching agent. It is not highly soluble in water.

Q11. Which one of the following is viscous? / निम्नलिखित में से किसकी श्यानता अधिक है?     
(a) Alcohol / शराब
(b) Water / पानी
(c) Honey / शहद
(d) Gasoline / गैसोलीन
Show Answer
Sol. ‘Viscosity’ of a fluid is a measure of its resistance to gradual deformation by stress or tensile stress. For liquids, it corresponds to the informal concept of ‘Thickness’. For example, Honey has a much higher viscosity than water. 
Q12. Which acid is used in photography – / फोटोग्राफी में कौन सा अम्ल उपयोग किया जाता है? 
(a) Formic acid / फॉर्मिक अम्ल
(b) Oxalic acid / ऑक्सैलिक अम्ल
(c) Citric acid / सिट्रिक अम्ल
(d) Acetic acid / एसिटिक अम्ल
Show Answer
Sol. Oxalic acid is used in photography as Ferrous Oxalate. Formic acid is found in ants. Citric acid is found in lemon and Acetic acid is also found in vinegar. 

Q13. Which one of the following acids is used in the manufacturing of baking powder? / निम्नलिखित अम्लो में से किसका उपयोग बेकिंग पाउडर के निर्माण में किया जाता है?
(a) Oxalic Acid / ऑक्सैलिक अम्ल
(b) Lactic Acid / लैक्टिक अम्ल
(c) Tartaric Acid / टारटरिक अम्ल
(d) Benzoic Acid / बेंजोइक अम्ल
Show Answer
Sol. Tartaric acid is used in the manufacturing of baking powder. This tartaric acid occurs naturally in many plants particularly in grapes, bananas and tamarinds. It is commonly combined with baking soda to function as a leavening agent in recipes and is one of the main acids found in wine. 
Q14. The main component of honey is: / शहद का प्रमुख घटक है- 
(a) Glucose / ग्लूकोज
(b) Sucrose / सुक्रोज
(c) Maltose / माल्टोस
(d) Fructose / फ्रुक्टोज    
Show Answer
Sol. The main components of honey are fructose – 38.2%, glucose -31.3%, sucrose – 1.3%, maltose – 7.1% and water – 17.2%. Fructose or fruit sugar is simple ketonic monosaccharide found in many plants. 
Q15. Methane is present in the atmosphere of- 
मीथेन किसके वायुमंडल में मौजूद है?
(a) Moon / चंद्रमा
(b) Sun / सूरज
(c) Jupiter / बृहस्पति
(d) Mars / मंगल 
Show Answer
Sol. First NASA Goddard Space Flight Centre confirmed the presence of Methane in the atmosphere of Mars. In 2014, Mars Express Orbiter and Canada France Telescope at Hawaii further confirmed the presence of methane on Mars.

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