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.
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
S1. Ans.(b)
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
S2. Ans.(c)
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 / एनी टर्मिनल
S3. Ans.(a)
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
S4. Ans.(d)
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
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-
मनुष्य के लिए ध्वनि की सहनशील सीमा लगभग है:
(a) 45 decibel / डेसीबल
(b) 85 decibel / डेसीबल
(c) 125 decibel / डेसीबल
(d) 155 decibel/ डेसीबल
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.
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 प्रसारित होता है। इस स्टेशन द्वारा प्रेषित वाहक तरंग की आवृत्ति है:
(a) 10 KHz
(b) 100 KHz
(c) 10 MHz
(d) 100 MHz
Q8. The concept of expanding universe is based on-
ब्रह्मांड के विस्तार की अवधारणा किस पर आधारित है?
(a) Doppler effect / डोप्लर प्रभाव
(b) Stark effect / स्टार्क प्रभाव
(c) Zeeman effect / ज़ीमेन प्रभाव
(d) Raman effect / रमन प्रभाव
S8. Ans.(a)
Sol. The concept of expanding universe is based on Doppler effect. It was named after Christian Doppler, who first came up with the idea in 1942. Edwin Hubble used the Doppler Effect to determine that universe is expanding. Hubble found that the light from distant galaxies was shifted towards lower frequencies, to the red end of the spectrum. This is known as a red Doppler shift or a red-shift.
Q9. A biotechnique in which ultrasonic sound is used-
एक बायोटेक्निक जिसमें अल्ट्रासोनिक ध्वनि का उपयोग किया जाता है
(a) Sonography / सोनोग्राफी
(b) E.C.G / ई.सी.जी.
(c) E.E.G / ई.ई.जी.
(d) X-ray / एक्स-रे
S9. Ans.(a)
Sol. Sonography or ultrasonography is an important mean of clinical diagnosis. It is a diagnostic imaging technique based on the application of ultrasound. It is widely used in the field of medical science.
Q10. CT Scan is done by using-
सीटी स्कैन किसके उपयोग द्वारा किया जाता है?
(a) Infra-red Rays/ इन्फ्रा-रेड किरणें
(b) Ultrasonic Waves / अल्ट्रासोनिक तरंगे
(c) Visible Light / दृश्यमान प्रकाश
(d) X-Rays / एक्स-रे
S10. Ans.(d)
Sol. CT scan or computed tomography are special x-rays tests that produce cross-sectional images of the body using x-rays and a computer.
Q11. Which one of the following atomic plants of India is located in the IV Seismic Zone?
भारत के निम्नलिखित परमाणु संयंत्रों में से कौन सा चतुर्थ भूकंपीय क्षेत्र में स्थित है?
(a) Kaiga / कैगा
(b) Kalpakkam /कलपक्कम
(c) Narora /नरोरा
(d) Tarapur /तारापुर
S11. Ans.(c)
Sol. Narora power station is located in the IV Seismic Zone. Kalpakkam is located into the II Seismic Zone. Kaiga and Tarapur are located into the III Seismic Sone.
Q12. The oil in the wick of an oil lamp rises up due to –
तेल दीपक में बत्ती किसके माध्यम से बढ़ता है?
(a) Capillary action / केशिका क्रिया
(b) Low viscosity of oil / तेल की कम श्यानता
(c) Gravitational force / गुरुत्वाकर्षण बल
(d) Pressure difference /दाब अंतर
S12.Ans.(a)
Sol. The oil in the wick of an oil lamp rises up is an example of capillary action.
Q13. The working of a rocket is based on the principle of –
किसी रॉकेट के काम करने का सिद्धांत किस पर आधारित है:
(a) Conservation of momentum / संवेग का संरक्षण
(b) Conservation of mass/ द्रव्यमान का संरक्षण
(c) Conservation of energy/ ऊर्जा का संरक्षण
(d) Conservation of angular momentum/ कोणीय संवेग का संरक्षण
S13.Ans.(a)
Sol. The working principle of rocket is conservation of momentum.
Q14. What is absolute zero temperature?/ परम शून्य तापमान क्या है?
(a) The starting point of any temperature scale / किसी भी तापमान पैमाने का प्रारंभिक बिंदु
(b) Theoretically the lowest possible temperature / सैद्धांतिक रूप से सबसे कम संभव तापमान
(c) The temperature at which the vapour of any liquid substance is condensed. / तापमान जिस पर किसी तरल पदार्थ का वाष्प संघनित होता है।
(d) The temperature at which all material in vapour form. / तापमान जिस पर सभी सामग्री वाष्प रूप में होता है।
S14. Ans.(b)
Sol. Absolute zero is the lowest possible temperature at which point the atoms of a substance transmit no thermal energy. They are completely at rest. It is 0 degrees on the Kelvin scale, which translates to-273.15 degree Celsius.
Q15. Rectifiers convert _____./ रेक्टीफायर _____ परिवर्तित करते हैं।
(a) High voltage to low voltage/ उच्च वोल्टेज को कम वोल्टेज
(b) Low voltage to high voltage/ कम वोल्टेज को उच्च वोल्टेज
(c) AC to DC / एसी से डीसी
(d) DC to AC/ डीसी से एसी
S15. Ans.(c)
Sol. A rectifier is an electrical device composed of one or more diodes that converts alternating current (AC) to direct current (DC).
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