Railway Board offers opulent and revered job posts to its aspirants. And it is not every year that we get the notification from Railway offering a good number of vacant seats to the multitude aspirants. But the current year 2018 brought a pleasant surprise with almost 1,20,000 seats to be filled by the valid candidates. Opportunity is here but you have to welcome it with a provident strategy.
रेलवे बोर्ड अपने उम्मीदवारों के लिए भव्य और प्रतिष्ठित कार्य पदों की पेशकश करता है. और हर साल ऐसा नहीं होता है कि हमें रेलवे की ओर से अधिसूचना मिलती है. लेकिन वर्तमान वर्ष 2018 आपके लिए बहुत सुखद वर्ष है क्योंकि इसमें लगभग 1,20,000 सीटों को वैध उम्मीदवारों द्वारा भरा जाएगा. आपके पास बहुत अच्छा अवसर है और आपको इसे एक बेहतर रणनीति से प्राप्त करना होगा.
Q1. An element X has four electrons in its outermost orbit. What will be the formula of its compounds with Hydrogen?
एक तत्व X में इसकी बाहरी कक्षा में चार इलेक्ट्रॉन हैं। हाइड्रोजन के साथ इसके यौगिक का सूत्र क्या होगा?
(a) X_4 H
(b) X_4 H_4
(c) XH_3
(d) XH_4
S1. Ans.(d)
Sol. The compounds of element X which has four electrons in its outermost orbit will be XH4.
Sol. The compounds of element X which has four electrons in its outermost orbit will be XH4.
Q2. According to weight, the percentage of Hydrogen in water (H_2 O), is:
भार के अनुसार, जल में हाइड्रोजन (H_2 O) का प्रतिशत है:
(a) 44.45%
(b) 5.55%
(c) 88.89%
(d) 11.11%
Show Answer
S2. Ans.(d)
Sol. Percentage of the composition is the percent by mass of each element present in a compound.
In Water, H2O = 2 + 16 = 18 g/mol
Molecular weight of water 18.0152 grams
No. of Hydrogen atoms present in Water = 2
∴ Percentage of Hydrogen in water
= 2/18×100=11.11%
Sol. Percentage of the composition is the percent by mass of each element present in a compound.
In Water, H2O = 2 + 16 = 18 g/mol
Molecular weight of water 18.0152 grams
No. of Hydrogen atoms present in Water = 2
∴ Percentage of Hydrogen in water
= 2/18×100=11.11%
Q3. The burning of Hydrogen produces-
हाइड्रोजन को जलाने पर क्या उत्पन्न होता है?
(a) Oxygen / ऑक्सीजन
(b) Ash /राख
(c) Soil /मृदा
(d) Water /जल
Show Answer
S3. Ans.(d)
Sol. Hydrogen gas is highly flammable and burns in air at a very wide range of concentrations between 4% to 75% by volume. Hydrogen gas cannot burn in absence of air. But by burning with Oxygen it produces water.
Sol. Hydrogen gas is highly flammable and burns in air at a very wide range of concentrations between 4% to 75% by volume. Hydrogen gas cannot burn in absence of air. But by burning with Oxygen it produces water.
Q4. Which one of the following fuels causes minimum air pollution?
निम्नलिखित में से कौन-सा ईंधन न्यूनतम वायु प्रदूषण का कारण बनता है?
(a) Kerosene oil / केरोसिन तेल
(b) Hydrogen / हाइड्रोजन
(c) Coal / कोयला
(d) Diesel / डीजल
Show Answer
S4. Ans.(b)
Sol. Hydrogen is the purest combustion fuel. Water is generated from burning of Hydrogen. While coal, kerosene oil and diesel are known as fossil fuel or carbonic fuel which generates Carbon dioxide and many other harmful gases when it burns.
Sol. Hydrogen is the purest combustion fuel. Water is generated from burning of Hydrogen. While coal, kerosene oil and diesel are known as fossil fuel or carbonic fuel which generates Carbon dioxide and many other harmful gases when it burns.
Q5. Heavy water is a type of-
भारी जल किसका एक प्रकार है?
(a) Coolant / शीतलक
(b) Moderator / मॉडरेटर
(c) Ore / अयस्क
(d) Fuel / ईंधन
Show Answer
S5. Ans.(b)
Sol. Heavy water (D2O) Deuterium Oxide is used as a moderator and coolant in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of Hydrogen which comprises both a neutron and a proton. D2O is a form of water which reacts with Oxygen to form Deuterium Oxide (O2O), also known as heavy water.
Sol. Heavy water (D2O) Deuterium Oxide is used as a moderator and coolant in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons. Deuterium is an isotope of Hydrogen which comprises both a neutron and a proton. D2O is a form of water which reacts with Oxygen to form Deuterium Oxide (O2O), also known as heavy water.
Q6. The chemical formula of Heavy Water is?
भारी जल का रासायनिक सूत्र है?
(a) H_2 O
(b) D_2 O
(c) H_2 CO_3
(d) H_2 S
Show Answer
S6. Ans.(b)
Sol. Heavy water is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water. The chemical formula of Heavy Water is D2O.
Sol. Heavy water is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water. The chemical formula of Heavy Water is D2O.
Q7. Chemically “Plaster of Paris” is:
रासायनिक रूप से “पेरिस का प्लास्टर” है:
(a) Calcium Sulphate / कैल्शियम सल्फेट
(b) Calcium Carbonate / कैल्शियम कार्बोनेट
(c) Calcium Oxide / कैल्शियम ऑक्साइड
(d) Calcium Oxalate / कैल्शियम ऑक्सालेट
रासायनिक रूप से “पेरिस का प्लास्टर” है:
(a) Calcium Sulphate / कैल्शियम सल्फेट
(b) Calcium Carbonate / कैल्शियम कार्बोनेट
(c) Calcium Oxide / कैल्शियम ऑक्साइड
(d) Calcium Oxalate / कैल्शियम ऑक्सालेट
Show Answer
S7. Ans.(a)
Sol. A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Sol. A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Q8. The chemical formula of the Plaster of Paris is-
प्लास्टर ऑफ पेरिस का रासायनिक सूत्र है:
(a) CaSO4
(b) CaSO4 ½ H2O
(c) CaSO4. H2O
(d) CaSO4. 2H2O
प्लास्टर ऑफ पेरिस का रासायनिक सूत्र है:
(a) CaSO4
(b) CaSO4 ½ H2O
(c) CaSO4. H2O
(d) CaSO4. 2H2O
Show Answer
S8. Ans.(b)
Sol. A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Sol. A group of gypsum cement, essentially hemihydrated Calcium Sulphate (CaSO4. 1/2H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Q9. Monazite is an ore of-
मोनाजाईट किसका एक अयस्क है?
(a) Zirconium / ज़िरकोनियम
(b) Thorium / थोरियम
(c) Titanium / टाइटेनियम
(d) Iron / आयरन
मोनाजाईट किसका एक अयस्क है?
(a) Zirconium / ज़िरकोनियम
(b) Thorium / थोरियम
(c) Titanium / टाइटेनियम
(d) Iron / आयरन
Show Answer
S9. Ans.(b)
Sol. Monazite is an important ore for Thorium, Lanthanum and Cerium. India, Madagascar and South Africa have large deposits of monazite sands. The deposits in India are particularly rich in Monazite. Its extensive deposits are found in Southern India.
Sol. Monazite is an important ore for Thorium, Lanthanum and Cerium. India, Madagascar and South Africa have large deposits of monazite sands. The deposits in India are particularly rich in Monazite. Its extensive deposits are found in Southern India.
Q10. Which one of the following is used in the manufacture of soaps?
साबुन के निर्माण में निम्नलिखित में से किसका उपयोग किया जाता है?
(a) Vegetable oil / वनस्पति तेल
(b) Mobil oil / मोबिल तेल
(c) Kerosene oil/ केरोसिन तेल
(d) Cutting oil / कटिंग आयल
साबुन के निर्माण में निम्नलिखित में से किसका उपयोग किया जाता है?
(a) Vegetable oil / वनस्पति तेल
(b) Mobil oil / मोबिल तेल
(c) Kerosene oil/ केरोसिन तेल
(d) Cutting oil / कटिंग आयल
Show Answer
S10. Ans.(a)
Sol. Soap is a combination of animal fat or plant oil and caustic soda. When dissolved in water, it breaks dirt away from surface. The modern soap makers use the fat that has been processed into fatty acids. This eliminates many impurities and it produces water as a by-product instead of glycerine. Many vegetable fats including olive oil, palm kernel oil and coconut oil are also used in soap making.
Sol. Soap is a combination of animal fat or plant oil and caustic soda. When dissolved in water, it breaks dirt away from surface. The modern soap makers use the fat that has been processed into fatty acids. This eliminates many impurities and it produces water as a by-product instead of glycerine. Many vegetable fats including olive oil, palm kernel oil and coconut oil are also used in soap making.
Q11. Acid produced naturally in our stomach is –
हमारे पेट में स्वाभाविक रूप से उत्पादित एसिड है
(a) Sulphuric acid / सल्फ्यूरिक एसिड
(b) Hydrochloric acid / हाइड्रोक्लोरिक एसिड
(c) Citric Acid / साइट्रिक एसिड
(d) Acetic Acid / एसिटिक एसिड
हमारे पेट में स्वाभाविक रूप से उत्पादित एसिड है
(a) Sulphuric acid / सल्फ्यूरिक एसिड
(b) Hydrochloric acid / हाइड्रोक्लोरिक एसिड
(c) Citric Acid / साइट्रिक एसिड
(d) Acetic Acid / एसिटिक एसिड
Show Answer
S11. Ans.(b)
Sol. Gastric acid, gastric juice or stomach acid, is a digestive fluid formed in the stomach and is composed of hydrochloric acid (HCl), potassium chloride (KCl) and sodium chloride (NaCl).
Sol. Gastric acid, gastric juice or stomach acid, is a digestive fluid formed in the stomach and is composed of hydrochloric acid (HCl), potassium chloride (KCl) and sodium chloride (NaCl).
Q12. Vinegar is chemically known as:
सिरका रासायनिक रूप से किस नाम से जाना जाता है?
(a) Acetic acid / एसिटिक एसिड
(b) Butyric acid / ब्यूटरीक एसिड
(c) Formic acid / फॉर्मिक एसिड
(d) Tartaric acid / टार्टेरिक एसिड
सिरका रासायनिक रूप से किस नाम से जाना जाता है?
(a) Acetic acid / एसिटिक एसिड
(b) Butyric acid / ब्यूटरीक एसिड
(c) Formic acid / फॉर्मिक एसिड
(d) Tartaric acid / टार्टेरिक एसिड
Show Answer
S12. Ans.(a)
Sol. Vinegar consists of acetic acid and water. A small amount of sugar and fruit juice may be added to vinegar as a flavouring agent.
Sol. Vinegar consists of acetic acid and water. A small amount of sugar and fruit juice may be added to vinegar as a flavouring agent.
Q13. Which of the following contains lactic acid?
निम्नलिखित में से किसमें लैक्टिक एसिड होता है?
(a) Ant’s sting / चींटी के डंक
(b) Unripe grapes / कच्चे अंगूर
(c) Lemon/ नींबू
(d)Sour milk / खट्टा दूध
निम्नलिखित में से किसमें लैक्टिक एसिड होता है?
(a) Ant’s sting / चींटी के डंक
(b) Unripe grapes / कच्चे अंगूर
(c) Lemon/ नींबू
(d)Sour milk / खट्टा दूध
Show Answer
S13. Ans.(d)
Sol. Lactic acid is found primarily in sour milk products.
Sol. Lactic acid is found primarily in sour milk products.
Q14. Lemon is citrus due to-
नींबू किसके कारण खट्टा होता है?
(a) Hydrochloric acid / हाइड्रोक्लोरिक एसिड
(b) Acetic acid/ एसिटिक एसिड
(c) Tartaric acid/ टार्टेरिक एसिड
(d) Citric acid / साइट्रिक एसिड
नींबू किसके कारण खट्टा होता है?
(a) Hydrochloric acid / हाइड्रोक्लोरिक एसिड
(b) Acetic acid/ एसिटिक एसिड
(c) Tartaric acid/ टार्टेरिक एसिड
(d) Citric acid / साइट्रिक एसिड
Show Answer
S14. Ans.(d)
Sol. Lemon contains citric acid (C6H8O7) which fulfills the deficiency in the body. Due to the lack of vitamin C, one may suffer from Scurvy disease. Citric acid is a weak organic acid found in citrus fruits. Citric acid is most concentrated in lemons and limes, where it can comprise as much as 8% of the dry weight of the fruit. Acetic acid is found in vinegar, while Tartaric acid is found in tamarind.
Sol. Lemon contains citric acid (C6H8O7) which fulfills the deficiency in the body. Due to the lack of vitamin C, one may suffer from Scurvy disease. Citric acid is a weak organic acid found in citrus fruits. Citric acid is most concentrated in lemons and limes, where it can comprise as much as 8% of the dry weight of the fruit. Acetic acid is found in vinegar, while Tartaric acid is found in tamarind.
Q15. A polymer used for making a nonstick surface coating for utensils is-
बर्तनों के लिए नॉनस्टिक सतह कोटिंग बनाने के लिए इस्तेमाल किया जाने वाला एक बहुलक है
(a) Polyvinyl chloride / पॉलीविनाइल क्लोराइड
(b) Teflon / टेफ्लॉन
(c) Polystyrene/ पॉलीस्टीरिन
(d) Polypropylene / पॉलीप्रोपाइलीनs
बर्तनों के लिए नॉनस्टिक सतह कोटिंग बनाने के लिए इस्तेमाल किया जाने वाला एक बहुलक है
(a) Polyvinyl chloride / पॉलीविनाइल क्लोराइड
(b) Teflon / टेफ्लॉन
(c) Polystyrene/ पॉलीस्टीरिन
(d) Polypropylene / पॉलीप्रोपाइलीनs
Show Answer
S15. Ans. (b)
Sol. Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTFE is a solid fluorocarbon. Its density is 2.2 g/cm3 and its melting point is 327°C. This is especially used for making a non-stick surface coating for utensils.
Sol. Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTFE is a solid fluorocarbon. Its density is 2.2 g/cm3 and its melting point is 327°C. This is especially used for making a non-stick surface coating for utensils.
