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 1,27,278 seats to be filled by the valid candidates. Opportunity is here but you have to welcome it with a provident strategy.
Q1. The material used in the fabrication of a transistor is –
ट्रांजिस्टर के निर्माण में उपयोग किया जाने वाला धातु है:
(a) Aluminum/ एल्यूमिनियम
(b) Copper / कॉपर
(c) Silicon / सिलिकॉन
(d) Silver / रजत
ट्रांजिस्टर के निर्माण में उपयोग किया जाने वाला धातु है:
(a) Aluminum/ एल्यूमिनियम
(b) Copper / कॉपर
(c) Silicon / सिलिकॉन
(d) Silver / रजत
Ans.(c)
Sol.The fabrication of the transistor is the process of creating the transistor that is used in electrical and electronics circuit. Transistors are made from very pure silicon or germanium, but certain other semiconductor materials can also be used.
Sol.The fabrication of the transistor is the process of creating the transistor that is used in electrical and electronics circuit. Transistors are made from very pure silicon or germanium, but certain other semiconductor materials can also be used.
Q2. In which of the following processes is energy released?
निम्नलिखित में से किस प्रक्रिया में ऊर्जा मुक्त होती है?
(a) Respiration/ श्वसन
(b) Photosynthesis/ प्रकाश संश्लेषण
(c) Evaporating liquid water/ तरल जल के वाष्पीकरण
(d) Absorption/ अवशोषण
Show Answer
Ans.(a)
Sol. Respiration is the process in which energy is released.
Sol. Respiration is the process in which energy is released.
Q3. If a boy is sitting in a train, which is moving at a constant velocity throws a ball straight up into the air, the ball will –
यदि कोई लड़का एक ट्रेन में बैठा है, जो नियत वेग से चल रही है, वह गेंद को सीधे हवा में फेंकता है, गेंद:
(a) fall in front of him/ उसके सामने गिरेगा
(b) fall behind him/ उसके पीछे गिरेगा
(c) fall into hand / हाथ में गिरेगा
(d) None of the above/ उपर्युक्त में से कोई नहीं
Show Answer
Ans.(c)
Sol.If a boy is sitting in a train, which is moving at a constant velocity throws a ball straight up into the air, the ball will fall into his hand.
Sol.If a boy is sitting in a train, which is moving at a constant velocity throws a ball straight up into the air, the ball will fall into his hand.
Q4. A person is hurt on kicking a stone due to –
एक पत्थर पर पैर मारने से व्यक्ति को किसके कारण चोट लगती है?
(a) Inertia / जड़ता
(b) Velocity / वेग
(c) Reaction / प्रतिक्रिया
(d) Momentum /संवेग
Show Answer
Ans.(c)
Sol.A person is hurt on kicking a stone due to reaction. Here Newton third law of motion is applied which states that every action has equal and opposite reaction.
Sol.A person is hurt on kicking a stone due to reaction. Here Newton third law of motion is applied which states that every action has equal and opposite reaction.
Q5. For a body moving with non-uniform acceleration –
असमान त्वरण के साथ चलने वाली पिंड के लिए:
(a) Displacement-time graph is linear/ विस्थापन-समय ग्राफ रैखिक होता है
(b) Displacement-time graph is non-linear/ विस्थापन-समय ग्राफ अ-रैखिक होता है
(c) Velocity-time graph is non-linear / वेग-समय ग्राफ अ-रैखिक होता है
(d) Velocity-time graph is linear/ वेग-समय ग्राफ रैखिक होता है
Show Answer
Ans.(c)
Sol.For a body moving with non-uniform acceleration, the velocity -time graph is non linear.
Sol.For a body moving with non-uniform acceleration, the velocity -time graph is non linear.
Q6. Why does an iron nail float on mercury while it sinks in water?
एक लौहे की कील पारा में तैरती है जबकि पानी में डूब जाती है, क्यों?
(a) Due to less chemical interaction of iron with mercury than it is with water / पानी की तुलना में पारा के साथ लौहे के कम रासायनिक प्रतिक्रिया के कारण
(b) Iron is heavier than water and lighter than mercury. / लौहा पानी की तुलना में भारी है और पारा से हल्का होता है।
(c) Iron has greater density than water and lesser than mercury.
लौहे का घनत्व पानी की तुलना में अधिक और पारा से कम होता है।
(d) Mercury is heavier than water. / पारा पानी से भारी होता है।
Show Answer
Ans.(c)
Sol. An iron ball floats on mercury but gets immersed in water because the relative density of mercury is greater than the relative density of iron. However iron has a higher density than water.
Sol. An iron ball floats on mercury but gets immersed in water because the relative density of mercury is greater than the relative density of iron. However iron has a higher density than water.
Q7. The clouds float in the atmosphere because of their low:/ किसके कारण बादल वायुमंडल में तैरते हैं?
(a) Temperature/ तापमान
(b) Velocity / वेग
(c) Pressure / दबाव
(d) Density / घनत्व
(a) Temperature/ तापमान
(b) Velocity / वेग
(c) Pressure / दबाव
(d) Density / घनत्व
Show Answer
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.
Q8. In fiber-optics communication, the signal travels in the form of-
फाइबर ऑप्टिक्स संचार में, सिग्नल किसके रूप में यात्रा करता है?
(a) Lightwave / प्रकाश तरंग
(b) Radio wave / रेडियो तरंग
(c) Microwave / माइक्रोवेव
(d) Electric wave / विद्युत तरंग
फाइबर ऑप्टिक्स संचार में, सिग्नल किसके रूप में यात्रा करता है?
(a) Lightwave / प्रकाश तरंग
(b) Radio wave / रेडियो तरंग
(c) Microwave / माइक्रोवेव
(d) Electric wave / विद्युत तरंग
Show Answer
Ans.(a)
Sol. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fibre.
Sol. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fibre.
Q9. ‘Raman effect’ deals with the light rays passing through
'रमन प्रभाव' ____ से गुजरने वाली प्रकाश किरणों से संबंधित है
(a) Only fluids / केवल तरल पदार्थ
(b) Only prisms / केवल प्रिज्म
(c) Only diamonds / केवल हीरे
(d) All transparent medium/ सभी पारदर्शी माध्यम
'रमन प्रभाव' ____ से गुजरने वाली प्रकाश किरणों से संबंधित है
(a) Only fluids / केवल तरल पदार्थ
(b) Only prisms / केवल प्रिज्म
(c) Only diamonds / केवल हीरे
(d) All transparent medium/ सभी पारदर्शी माध्यम
Show Answer
Ans.(d)
Sol. Raman effect deals with the light rays passing through all transparent medium. According to this, a beam of light traverses a dust-free transparent sample of a chemical compound, a small fraction of light emerges in directions other than that of the incident (incoming) beam.
Sol. Raman effect deals with the light rays passing through all transparent medium. According to this, a beam of light traverses a dust-free transparent sample of a chemical compound, a small fraction of light emerges in directions other than that of the incident (incoming) beam.
Q10. The image formed on Retina is: / रेटिना पर बनाई गई छवि है:
(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 उलटा
(d) Equal to object but straight / वस्तु के बराबर लेकिन सीधा
Show Answer
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.
Q11. Food gets cooked faster in a pressure cooker because-
एक प्रेशर कुकर में खाना तेजी से पकता है, क्योंकि-
(a) Water starts boiling at a lower temperature due to high pressure
उच्च दबाव के कारण पानी कम तापमान पर उबलना शुरू करता है
(b) Water starts boiling at a higher temperature due to high pressure / उच्च दबाव के कारण पानी अधिक तापमान पर उबलना शुरू करता है
(c) Water boils only at 100° C but the heat content is higher at high pressure / पानी केवल 100 डिग्री सेल्सियस पर उबलता है लेकिन ऊष्मा की मात्रा उच्च दबाव पर अधिक होती है
(d) Convection currents are set inside the cooker/ कुकर के भीतरसंवहन धाराएं स्थापित हो जाती हैं
एक प्रेशर कुकर में खाना तेजी से पकता है, क्योंकि-
(a) Water starts boiling at a lower temperature due to high pressure
उच्च दबाव के कारण पानी कम तापमान पर उबलना शुरू करता है
(b) Water starts boiling at a higher temperature due to high pressure / उच्च दबाव के कारण पानी अधिक तापमान पर उबलना शुरू करता है
(c) Water boils only at 100° C but the heat content is higher at high pressure / पानी केवल 100 डिग्री सेल्सियस पर उबलता है लेकिन ऊष्मा की मात्रा उच्च दबाव पर अधिक होती है
(d) Convection currents are set inside the cooker/ कुकर के भीतरसंवहन धाराएं स्थापित हो जाती हैं
Show Answer
Ans.(b)
Sol. Food can be cooked faster in a pressure cooker since the boiling point of water increases with pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature.
Sol. Food can be cooked faster in a pressure cooker since the boiling point of water increases with pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature.
Q12. When a piece of ice floating in a glass of water melts, the level of water will:
जब पानी के गिलास में तैरता बर्फ का एक टुकड़ा पिघल जाता है, तो पानी के स्तर में होगा:
(a) Fall / गिरावट
(b) Rise /वृद्धि
(c) Remain same /समान रहेगा
(d) Fall or rise depends on the temperature of water / गिरावट या वृद्धि पानी के तापमान पर निर्भर करता है
जब पानी के गिलास में तैरता बर्फ का एक टुकड़ा पिघल जाता है, तो पानी के स्तर में होगा:
(a) Fall / गिरावट
(b) Rise /वृद्धि
(c) Remain same /समान रहेगा
(d) Fall or rise depends on the temperature of water / गिरावट या वृद्धि पानी के तापमान पर निर्भर करता है
Show Answer
Ans.(c)
Sol. We know that the mass of liquid displaced by the floating ice equals to the mass of the object. That’s why the ice caps float on water. Similarly, when an ice cube melts in a glass of water, the water level does not change as the melted water will occupy exactly the same amount of space as the ice under the water level previously occupied.
Sol. We know that the mass of liquid displaced by the floating ice equals to the mass of the object. That’s why the ice caps float on water. Similarly, when an ice cube melts in a glass of water, the water level does not change as the melted water will occupy exactly the same amount of space as the ice under the water level previously occupied.
Q13. If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy is original, volume?
यदि किसी गैस को इसके मूल आयतन से आधे तक 27 डिग्री सेल्सियस पर संपीड़ित किया जाता है, तो इसका मूल आयतन प्राप्त करने के लिए इसे किस तापमान पर गर्म किया जाना चाहिए?
(a) 327°C
(b) 600°C
(c) 54°C
(d) 300°C
Show Answer
Ans.(a)
Q14. A device which converts electrical energy into mechanical energy is- / एक उपकरण जो विद्युत ऊर्जा को यांत्रिक ऊर्जा में परिवर्तित करता है
(a) Dynamo / डायनेमो
(b) Transformer / ट्रांसफार्मर
(c) Electric motor/ इलेक्ट्रिक मोटर
(d) Inductor / इन्डक्टर
(a) Dynamo / डायनेमो
(b) Transformer / ट्रांसफार्मर
(c) Electric motor/ इलेक्ट्रिक मोटर
(d) Inductor / इन्डक्टर
Show Answer
Ans.(c)
Sol. Electric motor is a device which converts electrical energy into mechanical energy. Electric motors involve rotating coils of wire which are driven by the magnetic force exerted by a magnetic field or an electric current.
Sol. Electric motor is a device which converts electrical energy into mechanical energy. Electric motors involve rotating coils of wire which are driven by the magnetic force exerted by a magnetic field or an electric current.
Q15. Electric motors operating at low voltages tend to burn out because-
कम वोल्टेज पर चलने वाले इलेक्ट्रिक मोटर जल जाते हैं, क्योंकि-
(a) They draw more current which is inversely proportional to the voltage. / वे अधिक करेंट आकर्षित करते हैं जो वोल्टेज के व्युत्क्रमानुपाती होता है।
(b) They draw more current which is inversely proportional to the square root of the voltage.
(c) They draw heat proportional to V² / वे V² के आनुपातिक ऊष्मा आकर्षित करते हैं।
(d) Low voltage sets in electrical discharge./ कम वोल्टेज विद्युत डिस्चार्ज में सेट होता है।
कम वोल्टेज पर चलने वाले इलेक्ट्रिक मोटर जल जाते हैं, क्योंकि-
(a) They draw more current which is inversely proportional to the voltage. / वे अधिक करेंट आकर्षित करते हैं जो वोल्टेज के व्युत्क्रमानुपाती होता है।
(b) They draw more current which is inversely proportional to the square root of the voltage.
(c) They draw heat proportional to V² / वे V² के आनुपातिक ऊष्मा आकर्षित करते हैं।
(d) Low voltage sets in electrical discharge./ कम वोल्टेज विद्युत डिस्चार्ज में सेट होता है।
Show Answer
Ans.(a)
Sol. Electric motors operating at low voltage tend to burn out because they draw more current which is inversely proportional to the voltage.
Sol. Electric motors operating at low voltage tend to burn out because they draw more current which is inversely proportional to the voltage.
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