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. The most commonly used substance in fluorescent tubes are-
फ्लोरोसेंट ट्यूबों में सामान्यतः सबसे अधिक इस्तेमाल किया जाने वाला पदार्थ हैं-
(a) Sodium Oxide and Argon / सोडियम ऑक्साइड और आर्गन
(b) Sodium Vapour and Neon / सोडियम वाष्प और नियॉन
(c) Mercury Vapour and Argon / मरकरी वाष्प और आर्गन
(d) Mercuric Oxide and Neon / मेर्कुरिक ऑक्साइड और नियॉन
Ans.(c)
Sol. Fluorescent lamp tube is filled with a gas containing low pressure mercury vapour and Argon. Sometimes gases like Xenon, Neon or Krypton can also be used. The pressure inside the lamp is around 0.3% of atmospheric pressure.
Sol. Fluorescent lamp tube is filled with a gas containing low pressure mercury vapour and Argon. Sometimes gases like Xenon, Neon or Krypton can also be used. The pressure inside the lamp is around 0.3% of atmospheric pressure.
Q2. Which one of the following metals is accessed in the native state?
निम्नलिखित में से कौन सी धातु का उपयोग मूल अवस्था में किया जाता है?
(a) Aluminium/अल्युमीनियम
(b) Gold/सोना
(c) Chromium/क्रोमियम
(d) Zinc/जस्ता
Show Answer
Ans.(b)
Sol. Among the metals, gold is the least reactive, so this was accessed the in the native (free) state. On the basis of reactivity, the decreasing order (From top to bottom) of metals is given below. Lithium (Li), Potassium (K), Barium (Ba), Strontium (Sr), Calcium (Ca), Sodium (Na), Magnesium (Mg), Aluminium (Al), Manganese (Mn), Zinc (Zn), Chromium (Cr), Iron (Fe), Cadmium (Cd), Cobalt (Co), Nickel (Ni), Tin (Sn), Lead (Pb), Copper (Cu), Mercury (Hg), Silver (Ag), Platinum (Pt), Gold (Au).
Q3. Of how many carats is the pure gold? Sol. Among the metals, gold is the least reactive, so this was accessed the in the native (free) state. On the basis of reactivity, the decreasing order (From top to bottom) of metals is given below. Lithium (Li), Potassium (K), Barium (Ba), Strontium (Sr), Calcium (Ca), Sodium (Na), Magnesium (Mg), Aluminium (Al), Manganese (Mn), Zinc (Zn), Chromium (Cr), Iron (Fe), Cadmium (Cd), Cobalt (Co), Nickel (Ni), Tin (Sn), Lead (Pb), Copper (Cu), Mercury (Hg), Silver (Ag), Platinum (Pt), Gold (Au).
शुद्ध सोना कितने कैरेट का होता है?
(a) 22
(b) 24
(c) 28
(d) 20
Show Answer
Ans.(b)
Sol. It is an extension of the older carat (Karat in North American spelling) system of denoting the purity of gold by fractions of 24, such as ’18 carat’ for an alloy with 75% (18 parts per 24) pure gold, it is usually alloyed with base metals for use in jewellery, altering its hardness and ductility, melting point, colour and other properties. Alloys with lower carat rating typically 22k, 18k, 14k or 10k contain higher percentages of copper or other base metals or silver or palladium in the alloy.
Sol. It is an extension of the older carat (Karat in North American spelling) system of denoting the purity of gold by fractions of 24, such as ’18 carat’ for an alloy with 75% (18 parts per 24) pure gold, it is usually alloyed with base metals for use in jewellery, altering its hardness and ductility, melting point, colour and other properties. Alloys with lower carat rating typically 22k, 18k, 14k or 10k contain higher percentages of copper or other base metals or silver or palladium in the alloy.
Q4. The softest mineral, Talc (Soapstone) is mainly: .
नरम खनिज, टॉल्क (सोपस्टोन) मुख्य रूप से क्या है:
(a) Manganese Silicate/मैंगनीज सिलिकेट
(b) Sodium Silicate/सोडियम सिलिकेट
(c) Sodium Phosphate/सोडियम फॉस्फेट
(d) Magnesium Silicate/मैग्नीशियम सिलिकेट
Show Answer
Ans.(d)
Sol. Talc is a mineral which is composed of hydrated Magnesium silicate with formula Mg3Si4O10(OH)2. On the Mohs hardness scale, the softest mineral talc is rated and the hardest mineral, the diamond is rated 10. In loose form, talc is the widely used substance known as a baby powder (aka talcum). It occurs as foliated to fibrous masses and in an exceptionally rare crystal form.
Sol. Talc is a mineral which is composed of hydrated Magnesium silicate with formula Mg3Si4O10(OH)2. On the Mohs hardness scale, the softest mineral talc is rated and the hardest mineral, the diamond is rated 10. In loose form, talc is the widely used substance known as a baby powder (aka talcum). It occurs as foliated to fibrous masses and in an exceptionally rare crystal form.
Q5. The chemical name of limestone is?
चूना पत्थर का रासायनिक नाम क्या है?
(a) Calcium Carbonate/कैल्शियम कार्बोनेट
(b) Magnesium Chloride/मैग्नीशियम क्लोराइड
(c) Sodium Chloride/सोडियम क्लोराइड
(d) Sodium Sulphide/सोडियम सल्फाइड
Show Answer
Ans.(a)
Sol. Limestone is a sedimentary rock composed largely of the minerals Calcite and Aragonite which are different crystals form of Calcium Carbonate (CaCO3). Limestone binds with silica and other impurities to remove them from the iron.
Sol. Limestone is a sedimentary rock composed largely of the minerals Calcite and Aragonite which are different crystals form of Calcium Carbonate (CaCO3). Limestone binds with silica and other impurities to remove them from the iron.
Q6. Which one of the following liquids is very good conductor of heat?
निम्न में से कौन सा तरल पदार्थ ऊष्मा का सुचालक है?
(a) Mercury / पारा
(b) Water / पानी
(c) Ether / ईथर
(d) Benzene / बेंजीन
Show Answer
Ans.(a)
Sol. Mercury is a chemical element with the symbol (Hg). Mercury is used in thermometers due to its special properties. It can measure a wide range of temperatures from – 40 to 356°C and up to 570°C under pressure in a liquid state. It expands changes. A heavy, silvery d-block element, mercury is the only metallic element which is found in liquid state at standard conditions for temperature and pressure.
Sol. Mercury is a chemical element with the symbol (Hg). Mercury is used in thermometers due to its special properties. It can measure a wide range of temperatures from – 40 to 356°C and up to 570°C under pressure in a liquid state. It expands changes. A heavy, silvery d-block element, mercury is the only metallic element which is found in liquid state at standard conditions for temperature and pressure.
Q7. Which one of the following metals is liquid at ordinary temperature?
निम्नलिखित में से कौन सी धातु सामान्य तापमान पर तरल होती है?
(a) Lead /लेड
(b) Nickel/ निकल
(c) Mercury/पारा
(d) Tin/टिन
निम्नलिखित में से कौन सी धातु सामान्य तापमान पर तरल होती है?
(a) Lead /लेड
(b) Nickel/ निकल
(c) Mercury/पारा
(d) Tin/टिन
Show Answer
Ans.(c)
Sol. Mercury is the only common metal which is liquid at ordinary temperature. Mercury is sometimes called quicksilver.
Sol. Mercury is the only common metal which is liquid at ordinary temperature. Mercury is sometimes called quicksilver.
Q8. Mercury is basically used in thermometer devices because its especiality is-
पारे को मूल रूप से थर्मामीटर उपकरणों में उपयोग किया जाता है क्योंकि इसकी विशिष्टता है-
(a) High density / उच्च घनत्व
(b) High liquidity / उच्च तरलता
(c) Good conductor of heat / ऊष्मा का सुचालक
(d) High specific heat / उच्च विशिष्ट ऊष्मा
पारे को मूल रूप से थर्मामीटर उपकरणों में उपयोग किया जाता है क्योंकि इसकी विशिष्टता है-
(a) High density / उच्च घनत्व
(b) High liquidity / उच्च तरलता
(c) Good conductor of heat / ऊष्मा का सुचालक
(d) High specific heat / उच्च विशिष्ट ऊष्मा
Show Answer
Ans.(c)
Sol. Mercury is easily the best liquid to use in thermometers, five important reasons are -
It is very reflective, so it’s easy to see and to read accurately.
It doesn’t wet the glass, so you don’t get an inaccurate reading if the temperature is falling.
It is metal, so it’s good conductor of heat.
It expands evenly with the temperature so a linear scale can be used with a high degree of accuracy.
there is a large of range of temperature for which it is a liquid
Sol. Mercury is easily the best liquid to use in thermometers, five important reasons are -
It is very reflective, so it’s easy to see and to read accurately.
It doesn’t wet the glass, so you don’t get an inaccurate reading if the temperature is falling.
It is metal, so it’s good conductor of heat.
It expands evenly with the temperature so a linear scale can be used with a high degree of accuracy.
there is a large of range of temperature for which it is a liquid
Q9. There is no reaction when steam passes over-
किस धातु में भाप गुजरने पर कोई प्रतिक्रिया नहीं होती है?
(a) Aluminium / अल्युमीनियम
(b) Copper / तांबा
(c) Carbon / कार्बन
(d) Iron / लोहा
किस धातु में भाप गुजरने पर कोई प्रतिक्रिया नहीं होती है?
(a) Aluminium / अल्युमीनियम
(b) Copper / तांबा
(c) Carbon / कार्बन
(d) Iron / लोहा
Show Answer
Ans.(a)
Sol. There is no reaction when steam passes over aluminium.
Sol. There is no reaction when steam passes over aluminium.
Q10. Iron is obtained from
आयरन से प्राप्त किया जाता है-
(a) Limestone/ चूना पत्थर
(b) pitch-blende/ पिच-मिश्रण
(c) Monazite sand/ मोनजाइट रेत
(d) Hematite/ हेमेटाइट
आयरन से प्राप्त किया जाता है-
(a) Limestone/ चूना पत्थर
(b) pitch-blende/ पिच-मिश्रण
(c) Monazite sand/ मोनजाइट रेत
(d) Hematite/ हेमेटाइट
Show Answer
Ans.(d)
Sol. Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and the iron itself is usually found in the form of magnetite (Fe3O4 – 72.4% Fe), hematite (Fe2O3 – 69.9% Fe).
Sol. Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and the iron itself is usually found in the form of magnetite (Fe3O4 – 72.4% Fe), hematite (Fe2O3 – 69.9% Fe).
Q11. Easily soluble in water-
पानी में आसानी से घुलनशील है-
(a) Carbon/कार्बन
(b) Nitrogen/नाइट्रोजन
(c) Ammonia/अमोनिया
(d) Iodine/आयोडीन
पानी में आसानी से घुलनशील है-
(a) Carbon/कार्बन
(b) Nitrogen/नाइट्रोजन
(c) Ammonia/अमोनिया
(d) Iodine/आयोडीन
Show Answer
Ans. (c)
Sol. Ammonia being a polar molecule dissolves readily in water. This is due to the Hydrogen atoms of Ammonia which are bonded with a highly electronegative Nitrogen and the Hydrogen atoms of water molecules which are bonded with the highly electronegative Oxygen atom.
Sol. Ammonia being a polar molecule dissolves readily in water. This is due to the Hydrogen atoms of Ammonia which are bonded with a highly electronegative Nitrogen and the Hydrogen atoms of water molecules which are bonded with the highly electronegative Oxygen atom.
Q12. Which is used as Laughing gas is–
हास्य गैस (लाफिंग गैस) के रूप में उपयोग की जाने वाली गैस है-
(a) Nitrous Oxide / नाईट्रस ऑक्साइड
(b) Nitrogen dioxide / नाइट्रोजन डाइऑक्साइड
(c) Nitrogen Trioxide / नाइट्रोजन ट्रायऑक्साइड
(d) Nitrogen Tetra Oxide / नाइट्रोजन टेट्राऑक्साइड
हास्य गैस (लाफिंग गैस) के रूप में उपयोग की जाने वाली गैस है-
(a) Nitrous Oxide / नाईट्रस ऑक्साइड
(b) Nitrogen dioxide / नाइट्रोजन डाइऑक्साइड
(c) Nitrogen Trioxide / नाइट्रोजन ट्रायऑक्साइड
(d) Nitrogen Tetra Oxide / नाइट्रोजन टेट्राऑक्साइड
Show Answer
Ans.(a)
Sol. Nitrous Oxide (N_2 O) is also known as laughing gas. It is a colourless gas with a sweet odour and taste. Inhalation leads to disorientation, euphoria, numbness, loss of coordination, dizziness and ultimately a loss of consciousness. It is also used as the anesthetic gas.
Sol. Nitrous Oxide (N_2 O) is also known as laughing gas. It is a colourless gas with a sweet odour and taste. Inhalation leads to disorientation, euphoria, numbness, loss of coordination, dizziness and ultimately a loss of consciousness. It is also used as the anesthetic gas.
Q13. Vinegar is chemically known as:
सिरका को रासायनिक रूप से जाना जाता है:
(a) Acetic acid / सिरका अम्ल
(b) Butyric acid / ब्यूट्रिक एसिड
(c) Formic acid / फॉर्मिक एसिड
(d) Tartaric acid / टारटरिक अम्ल
सिरका को रासायनिक रूप से जाना जाता है:
(a) Acetic acid / सिरका अम्ल
(b) Butyric acid / ब्यूट्रिक एसिड
(c) Formic acid / फॉर्मिक एसिड
(d) Tartaric acid / टारटरिक अम्ल
Show Answer
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.
Q14. Which of the following contains lactic acid?
निम्निखित में से किसमे लैक्टिक एसिड होता है?
(a) Ant’s sting / चींटी का डंक
(b) Unripe grapes / कच्चे अंगूर
(c) Lemon / नींबू
(d)Sour milk / खट्टा दूध
निम्निखित में से किसमे लैक्टिक एसिड होता है?
(a) Ant’s sting / चींटी का डंक
(b) Unripe grapes / कच्चे अंगूर
(c) Lemon / नींबू
(d)Sour milk / खट्टा दूध
Show Answer
Ans.(d)
Sol. Lactic acid is found primarily in sour milk products.
Sol. Lactic acid is found primarily in sour milk products.
Q15. 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
Ans.(d)
Sol. Lemon contains citric acid (C6H8O7) which fulfils 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 fulfils 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.
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