RRB NTPC Physics quiz for Stage I : 11/04/2019

RRB NTPC Physics quiz for Stage I

Railway/SSC JE Physics quiz for  (Phase I), RRB NTPC, SSC various exams and other competitive exams.

Q.1 What is the minimum distance (in meters) required to hear an echo?

 प्रतिध्वनि सुनने के लिए आवश्यक न्यूनतम दूरी (मीटर में) कितनी है?

(a) 10

(b) 13

(c) 17

(d) 21

Answer & Explanation

Exp. Echo is a reflection of sound that arrives at the listener with a delay after the direct sound.The reflecting object must be more than 17m from the sound source for echo to be perceived by a person located at the source.

Q.2 Why does a Black board appears black in colour?

ब्लैक बोर्ड काले रंग का क्यों दिखाई देता है?

(a) It reflects black colour/यह काले रंग को परावर्तित करता है

(b) It absorbs black colour/यह काला रंग अवशोषित करता है

(c) It reflects all colours/यह सभी रंगों को परावर्तित करता है

(d) It absorbs all the colours/ यह सभी रंगों को अवशोषित करता है

Answer & Explanation

Exp.A black board appears black because it absorbs all the colors of white light and reflects none.

Q.3 Which of the following instrument is used to measure Soil Water Tension?

मृदा जल तनाव को मापने के लिए निम्नलिखित में से कौन सा उपकरण प्रयोग किया जाता है?

(a) Photometer/प्रकाशमापी

(b) Pyrometer/ उत्तपमापी

(c) Psychrometer/साइक्रोमीटर 

(d) Tensiometer/टेंशनमीटर

Answer & Explanation

Exp.A tensiometer in soil science is a measuring instrument used to determine the Soil water tension.Such tensiometers are used in irrigation scheduling to help farmers and other irrigation managers to determine when to water. It can also be used in the scientific study of soils and plants.

Q.4 What is the SI unit of Force?

बल का एस.आई मात्रक क्या है?

(a) Pascal/पास्कल

(b) Boyle/बॉयल

(c) Newton/न्यूटन 

(d) Watt/वाट

Answer & Explanation

Exp.The SI unit of Force is Newton. One Newton is equal to 1 kilogram meter per second squared.  

Q.5 Which one of the following is a bad Thermal Conductor?

निम्नलिखित में से कौन सा ऊष्मा का कुचालक है?

(a) Aluminum/ एल्युमीनियम

(b) Copper/कॉपर

(c) Glass/ ग्लास 

(d) Silver/सिल्वर

Answer & Explanation

Exp.Glass is bad thermal conductor and is a good insulator.It has tightly held electrons which did not allow heat to flow through it.

Q.6 Who invented first working laser?

पहले वर्किंग लेज़र की खोज किसने की?

(a) A. H. Taylor/ए. एच. टेलर 

(b) W. K. Roentgen/विलहम कॉनरैड रॉटजन 

(c) T. H. Mailman/टी.एच. मेमन 

(d) Fred Morrison/फ्रेड मॉरिसन

Answer & Explanation

Exp.LASER (LIGHT AMPLIFICATION BY STIMULATED EMMISSION OF RADIATION)is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The first laser was built in 1960 by Theodore H. Maiman.

Q.7 In the absence of the earth’s atmosphere, sky would appear-

पृथ्वी के वायुमंडल की अनुपस्थिति में, आकाश कैसा दिखाई देगा?

(a) Blue/नीला

(b) Deep red/गहरा लाल 

(c) White/सफेद

(d) Black/काला

Answer & Explanation

Exp.In absence of earth’s atmosphere, sky would appear black due to absence of scattering phenomena.

Q.8 Temperature of distant luminous bodies can be determined by –

दूर चमकदार निकायों का तापमान निर्धारित किया जा सकता है

(a) Mercury thermometers/पारा थर्मामीटर

(b) Gas thermometers/गैस थर्मामीटर

(c) Pyrometers/पाइरोमीटर 

(d) Colour thermometers/रंग थर्मामीटर

Answer & Explanation

Exp.Temperature of distant luminous bodies can be determined by Pyrometers.  

Q.9 Energy travels from Sun to Earth through –

सूर्य से पृथ्वी तक ऊर्जा का संचरण ____ के माध्यम से होता है।

(a) Conduction/संचालन 

(b) Convection/संवहन 

(c) Radiation/विकिरण

(d) Modulation/मॉडुलेशन

Answer & Explanation

Exp.Energy travels from Sun to Earth through Radiation.

Q.10 Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in –

ताप किसमें अणुओं की वास्तविक गति के माध्यम से उच्च तापमान से निम्न

तापमान तक परसारित होती है?

(a) Conduction/संचालन

(b) Convection/संवहन

(c) Radiation/विकिरण

(d) Both conduction and convection/संचालन और संवहन दोनों 

Answer & Explanation

Exp.Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in both conduction and convection.


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