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. Xeric condition refers to-
जेरिक स्थिति किसको संदर्भित करता है?
(a) low temperature /कम तापमान
(b) low humidity /कम आर्द्रता
(c) high evaporation /उच्च वाष्पीकरण
(d) None of these/ इनमे से कोई नहीं
S1. Ans.(b)
Sol. Xeric condition refers to low humidity. Xeric environment is place where water is meager.
Sol. Xeric condition refers to low humidity. Xeric environment is place where water is meager.
Q2. A body floats at 4°C water. If temperature reaches 100°C then-
एक वस्तु 4 डिग्री सेल्सियस तापमान के पानी पर तैरती है। यदि तापमान 100 डिग्री सेल्सियस तक पहुंच जाए है तो-
(a) The body will sink /वस्तु डूब जाएगी
(b) No change /कोई बदलाव नहीं
(c) Less part of the body will submerge /वस्तु का कम भाग डूब जाएगा
(d) The body will float freely/वस्तु स्वतंत्र रूप से तैरेगी
Show Answer
S2. Ans.(a)
Sol. When the water is heated, its density decreases. The density of the water at 100°C is at the lowest, so the body will sink. Water density is maximum at 4°C, so the body will float.
Q3. Bats can fly during dark nights and also prey. This is because- Sol. When the water is heated, its density decreases. The density of the water at 100°C is at the lowest, so the body will sink. Water density is maximum at 4°C, so the body will float.
चमगादड़ रात के अँधेरे के दौरान उड़ान भर सकते हैं और शिकार भी कर सकते हैं. यह है क्योंकि-
(a) The pupil of their eyes is large / उनकी आंखों की पुतली बड़ी होती है.
(b) Their night vision is very good / उनकी रात्रि दृष्टि बहुत अच्छी है
(c) Every bird can do this / प्रत्येक पक्षी यह कर सकता है.
(d) They produce ultrasonic waves and are guided by them / वे अल्ट्रासोनिक तरंगें पैदा करते हैं और इनके द्वारा निर्देशित होते हैं
Show Answer
S3. Ans.(d)
Sol. Bats are a fascinating group animals. They are one of the few mammals that can use ultrasonic sound to navigate. As they fly, make an ultrasonic (shouting) sound. The returning echoes give the bats information about anything that is ahead of them, including the speed and size of an insect and which way it is going. This system of finding prey is called echolocation-locating things by their echoes.
Sol. Bats are a fascinating group animals. They are one of the few mammals that can use ultrasonic sound to navigate. As they fly, make an ultrasonic (shouting) sound. The returning echoes give the bats information about anything that is ahead of them, including the speed and size of an insect and which way it is going. This system of finding prey is called echolocation-locating things by their echoes.
Q4. Which one of the following is the effect of the flight of supersonic jet?
निम्नलिखित में से क्या सुपरसोनिक जेट की उड़ान का प्रभाव है?
(a) Air pollution/वायु प्रदुषण
(b) Eye disease/नेत्र रोग
(c) Depletion in ozone layer/ओजोन परत में कमी
(d) None of these/इनमे से कोई नहीं
Show Answer
S4. Ans.(c)
Sol. A jet engine is a machine for turning fuel into thrust. The thrust is produced by action and reaction also known as Newton’s third law of motion. Those jet planes which are able to fly faster than the speed of sound are called supersonic jet planes. Jet engines are responsible for depletion of ozone. Flying at stratosphere height, they emits nitrogen oxide which has the potential to destroy significant quantities of ozone in the stratosphere.
Sol. A jet engine is a machine for turning fuel into thrust. The thrust is produced by action and reaction also known as Newton’s third law of motion. Those jet planes which are able to fly faster than the speed of sound are called supersonic jet planes. Jet engines are responsible for depletion of ozone. Flying at stratosphere height, they emits nitrogen oxide which has the potential to destroy significant quantities of ozone in the stratosphere.
Q5. Which of the following has the longest wavelength?
निम्नलिखित में से किसकी सबसे लंबी तरंग दैर्ध्य है?
(a) Infrared/इन्फ्रारेड
(b) X-rays/एक्स-रे
(c) Visible light/दृश्य प्रकाश
(d) Radio waves/ रेडियो तरंगें
Show Answer
S5. Ans.(d)
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. The tolerable limit of noise for human being is around- 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.
मानव के लिए शोर की सहनीय सीमा लगभग _____ है
(a) 45 decibel / 45 डेसीबल
(b) 85 decibel /85 डेसीबल
(c) 125 decibel / 125 डेसीबल
(d) 155 decibel/155 डेसीबल
Show Answer
S6. Ans.(b)
Sol. The sound of 50 decibel is enough to wake up a sleeping person. To remain continuously in the sound of 80 decibel proves to be harmful. 85 decibel is the maximum limit to tolerate any noise by human being.
Sol. The sound of 50 decibel is enough to wake up a sleeping person. To remain continuously in the sound of 80 decibel proves to be harmful. 85 decibel is the maximum limit to tolerate any noise by human being.
Q7. A radio station broadcast at 30 metre band. The frequency of the carrier wave transmitted by this station is:-
एक रेडियो स्टेशन 30 मीटर बैंड पर प्रसारण करता है. इस स्टेशन द्वारा प्रेषित वाहक तरंग की आवृत्ति कितनी होती है:-
(a) 10 KHz /10 किलोहर्ट्ज
(b) 100 KHz / 100 किलोहर्ट्ज
(c) 10 MHz /10 मेगाहट्र्ज
(d) 100 MHz/ 100 मेगाहट्र्ज
एक रेडियो स्टेशन 30 मीटर बैंड पर प्रसारण करता है. इस स्टेशन द्वारा प्रेषित वाहक तरंग की आवृत्ति कितनी होती है:-
(a) 10 KHz /10 किलोहर्ट्ज
(b) 100 KHz / 100 किलोहर्ट्ज
(c) 10 MHz /10 मेगाहट्र्ज
(d) 100 MHz/ 100 मेगाहट्र्ज
Show Answer
S7. Ans.(c)
Sol. According to formula = > n = c/I
[where n=frequency,c=speed of light;I=wavelength]
=(3×〖10〗^8)/30=10×〖10〗^6=10 MHz
Sol. According to formula = > n = c/I
[where n=frequency,c=speed of light;I=wavelength]
=(3×〖10〗^8)/30=10×〖10〗^6=10 MHz
Q8. A cut diamond shines brilliantly due to-
एक कट हीरा शानदार ढंग से चमकता है-
(a) Total internal reflection / कुल आंतरिक प्रतिबिंब
(b) Absorption of light / प्रकाश का अवशोषण
(c) Some inherent property / कुछ अंतर्निहित संपत्ति
(d) Its molecular structure / इसकी आणविक संरचना
एक कट हीरा शानदार ढंग से चमकता है-
(a) Total internal reflection / कुल आंतरिक प्रतिबिंब
(b) Absorption of light / प्रकाश का अवशोषण
(c) Some inherent property / कुछ अंतर्निहित संपत्ति
(d) Its molecular structure / इसकी आणविक संरचना
Show Answer
S8. Ans.(a)
Sol. The refractive index of diamond is very high. Diamond achieves brilliance partially from total internal refraction. It has been cut or designed in such a way that if light enters into it, incident light strikes many of the internal surfaces.
Sol. The refractive index of diamond is very high. Diamond achieves brilliance partially from total internal refraction. It has been cut or designed in such a way that if light enters into it, incident light strikes many of the internal surfaces.
Q9. The clouds float in the atmosphere because of their low :
बादल वायु-मंडल में उनके कम __________के कारण उड़ते है:
(a) Temperature/तापमान
(b) Velocity/वेग
(c) Pressure/दाब
(d) Density/घनत्व
बादल वायु-मंडल में उनके कम __________के कारण उड़ते है:
(a) Temperature/तापमान
(b) Velocity/वेग
(c) Pressure/दाब
(d) Density/घनत्व
Show Answer
S9. Ans.(d)
Sol. Clouds from when the invisible water vapour in the air condenses into visible water droplets. They are so small that the effect of gravity on them is negligible. Thus the clouds float in the atmosphere because of their low density.
Sol. Clouds from when the invisible water vapour in the air condenses into visible water droplets. They are so small that the effect of gravity on them is negligible. Thus the clouds float in the atmosphere because of their low density.
Q10. Who discovered Television?
टेलीविजन की खोज किसने की थी?
(a) Edison/एडीसन
(b) Galileo/गैलीलियो
(c) Baird/बेयर्ड
(d) Franklin/फ्रेंकलिन
S10. Ans.(c)
Sol. Television was invented by J.L. Baird in 1926 in Britain. Galileo invented the Telescope.
Sol. Television was invented by J.L. Baird in 1926 in Britain. Galileo invented the Telescope.
Q11. In cold countries, alcohol is preferred to mercury as a thermometric liquid because:
ठंडे देशों में, एल्कोहल को पारे में थर्मामेट्रिक तरल के रूप में उपयोग किया जाता है क्योंकि-
(a) Alcohol has a lower freezing point /एल्कोहल का हिमांक बिन्दू कम है
(b) Alcohol is a better conductor of heat /एल्कोहल ऊष्मा का बेहतर सुचालक है
(c) Alcohol is cheaper than mercury /एल्कोहल पारे से सस्ता है
(d) The world production of alcohol is greater than that of mercury/ शराब का विश्व उत्पादन पारा के मुकाबले अधिक है
ठंडे देशों में, एल्कोहल को पारे में थर्मामेट्रिक तरल के रूप में उपयोग किया जाता है क्योंकि-
(a) Alcohol has a lower freezing point /एल्कोहल का हिमांक बिन्दू कम है
(b) Alcohol is a better conductor of heat /एल्कोहल ऊष्मा का बेहतर सुचालक है
(c) Alcohol is cheaper than mercury /एल्कोहल पारे से सस्ता है
(d) The world production of alcohol is greater than that of mercury/ शराब का विश्व उत्पादन पारा के मुकाबले अधिक है
Show Answer
S11. Ans.(a)
Sol. There are lots of reasons for using alcohol than mercury as thermometric liquids. Some alcohol has a very low freezing point of about-112°C and therefore is suitable to record very low temperature.
Sol. There are lots of reasons for using alcohol than mercury as thermometric liquids. Some alcohol has a very low freezing point of about-112°C and therefore is suitable to record very low temperature.
Q12. The colour of the star is an indication of its:
एक तारे का रंग किसका एक संकेत है:
(a) Distance from the earth/ पृथ्वी से दूरी
(b) Temperature / तापमान
(c) Luminosity / चमक
(d) Distance from the sun / सूर्य से दूरी
एक तारे का रंग किसका एक संकेत है:
(a) Distance from the earth/ पृथ्वी से दूरी
(b) Temperature / तापमान
(c) Luminosity / चमक
(d) Distance from the sun / सूर्य से दूरी
Show Answer
S12. Ans.(b)
Sol. The colour of the stars reflects the age of stars. Colour is reflected from the temperature is high, then the star is young. The star will be blue during young stage which indicates high temperature. If star is red the temperature is low.
Sol. The colour of the stars reflects the age of stars. Colour is reflected from the temperature is high, then the star is young. The star will be blue during young stage which indicates high temperature. If star is red the temperature is low.
Q13. Power of sunglass is-
धूप के चश्में की पॉवर है:
(a) 0 Dioptre /0 डायोप्टर
(b) 1 Dioptre /1 डायोप्टर
(c) 2 Dioptre /2 डायोप्टर
(d) 4 Dioptre /4 डायोप्टर
Show Answer
S13. Ans.(a)
Sol. The power of the sunglass is 0 dioptre.
Sol. The power of the sunglass is 0 dioptre.
Q14. For shaving, one uses-
शेविंग के लिए, एक का उपयोग करता है -
(a) Concave mirror/अवतल दर्पण
(b) Plain mirror /समतल दर्पण
(c) Convex mirror /उत्तल दर्पण
(d) None of these / इनमें से कोई नहीं
शेविंग के लिए, एक का उपयोग करता है -
(a) Concave mirror/अवतल दर्पण
(b) Plain mirror /समतल दर्पण
(c) Convex mirror /उत्तल दर्पण
(d) None of these / इनमें से कोई नहीं
Show Answer
S14. Ans.(a)
Sol. People use a concave mirror for shaving because when a man standing between the principal focus and pole of a concave mirror, he sees as enlarged, the erect and virtual image of his face.
Sol. People use a concave mirror for shaving because when a man standing between the principal focus and pole of a concave mirror, he sees as enlarged, the erect and virtual image of his face.
Q15. The image formed on Retina is :
रेटिना पर निर्मित प्रतिबिंब:
(a) Equal to object but inverted / वस्तु के बराबर लेकिन उल्टा
(b) Smaller than object but straight / वस्तु से छोटा लेकिन सीधा
(c) Smaller than object but inverted / वस्तु से छोटा लेकिन उल्टा
(d) Equal to object but straight / वस्तु के बराबर लेकिन सीधा
रेटिना पर निर्मित प्रतिबिंब:
(a) Equal to object but inverted / वस्तु के बराबर लेकिन उल्टा
(b) Smaller than object but straight / वस्तु से छोटा लेकिन सीधा
(c) Smaller than object but inverted / वस्तु से छोटा लेकिन उल्टा
(d) Equal to object but straight / वस्तु के बराबर लेकिन सीधा
Show Answer
S15. Ans.(c)
Sol. The image formed on Retina is real, inverted and smaller than the object.
Sol. The image formed on Retina is real, inverted and smaller than the object.
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