rrb ntpc /je group d

Q1. Funk invented- 
फंक ने किस का आविष्कार किया था?
(a) Vitamins /विटामिन
(b) Hormones / हार्मोन
(c) Proteins / प्रोटीन
(d) Enzymes / एंजाइम

Ans.(a)

Sol. Kazimierz Funk is generally credited with being among the first to formulate the concept of vitamins, which he called “vital amines” or “vitamins”. Umetaro Suzuki had in 1910 succeeded in extracting a water-soluble complex of micronutrients from rice bran and had named it “aberic acid”.

Q2. What are vitamins? 
विटामिन क्या है?
(a) Organic compound / कार्बनिक यौगिक
(b) Inorganic compound / अकार्बनिक यौगिक
(c) Living organism / जीव जंतु
(d) None of these /इनमें से कोई नहीं

Ans.(a)
Sol. Vitamins are organic compounds and a vital nutrient that an organism requires in limited amounts. An organic chemical compound (or related set of compounds) is called a vitamin when the organism cannot synthesize the compound in sufficient quantities and must be obtained through the diet.

Q3. Which one of the following groups of compounds is called ‘accessory dietary factor”? 
निम्नलिखित में से किस समूह के यौगिकों को ‘सहायक आहार कारक’ कहा जाता है?
(a) Fats / वसा
(b) Hormones / हार्मोन
(c) Proteins / प्रोटीन
(d) Vitamins/ विटामिन

Ans.(d)
Sol. Frederick Gowland Hopkins was the first scientist to elucidate the “accessory food factor,” the idea that food contains trace amounts of substances essential for nutrition. Accessory food factors later came to be called vitamins.

Q4. Which of the following elements is not essential for plant growth? 
निम्नलिखित में से कौन सा तत्व पौधे की वृद्धि के लिए आवश्यक नहीं है?
(a) Sodium / सोडियम
(b) Potassium / पोटैशियम
(c) Calcium / कैल्शियम
(d) Magnesium / मैगनीशियम

Ans.(a)
Sol. Essential elements are classified into following two categories.
• Macro elements (Major elements) – These are required by the plant in larger quantities. Eg-Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), Phosphorus (P), Potassium (K), Magnesium (Mg), Calcium (Ca) and Sulphur (S).
• Microelements (Minor elements or Trace elements)- These are required by the plant in low quantities. Example are Boron (B), Zinc (Zn), Manganese (Mn), Copper (Cu), Molybdenum (Mo), Chlorine (CI), Iron (Fe) and Nickel (Ni).

Q5. Vitamin B5 is called? 
विटामिन B5 क्या कहलाता है?
(a)Pantothenic acid / पैंटोथैनिक एसिड
(b)Folic acid / फोलिक एसिड
(c) Ratinol/रतिनोल
(d)Tocopherol / टोकोफेरोल

Ans.(a)
Sol. Vitamin B5, also known as pantothenic acid, is a water-soluble vitamin that is found in all living cells within the body.Aside from being critical in manufacturing red blood cells, vitamin B5 also plays a part in producing sex and stress-related hormones produced in the adrenal glands.

Q6. Which one of the following is the correct sequence of the given substances in the decreasing order of their densities? 
निम्नलिखित में से कौन सा पदार्थ, उनके घनत्व के घटते क्रम में दिए गए पदार्थों का सही क्रम है.
(a) Steel > Mercury > Gold / स्टील> पारा > सोना
(b) Gold > Mercury > Steel / सोना> पारा > स्टील
(c) Steel > Gold > Mercury / स्टील > सोना> पारा
(d) Gold > Steel > Mercury / सोना> स्टील> पारा

Ans.(b)
Sol. Substance Density
(gram/cm3) (Kg./meter3)
Gold 19.3 19,300
Mercury 13.6 13,534
Steel 7.8 7,870
Thus, from the above table, we see the correct sequence of decreasing order of the substances Gold > Mercury > Steel.

Q7. When eno salt is poured into the water, bubbles forms, which is due to- 
जब इनो नमक को पानी में डाला जाता है, तो बुलबुले उत्पन्न होते है, ऐसा किसके कारण होता है –
(a) O₂ gas/ O₂ गैस
(b) CO₂ gas/ CO₂ गैस
(c) CO gas / CO गैस
(d) H₂ gas / H₂ गैस

Ans.(b)
Sol. When eno salt is dissolved in water, the Carbon dioxide gas is produced which produce gas bubbles.

Q8. The chemical used as a ‘fixer’ in photography is- 
फोटोग्राफी में एक ‘फिक्सर’ के रूप में इस्तेमाल किया जाने वाला रसायन है – 
(a) Sodium sulphate/सोडियम सल्फ़ेट
(b) Sodium thiosulphate/सोडियम थियोसल्फ़ेट
(c) Ammonium persulphate/अमोनियम पर्सल्फ़ेट
(d) Borax/बोरेक्स

Ans.(b)
Sol. Sodium Thiosulphate is used in photography as a fixer of positive and negative.

Q9. Which one of the following is viscous? 
निम्नलिखित में से कौन सा पदार्थ चिपचिपा है? 
(a) Alcohol/अल्कोहॉल
(b) Water/पानी
(c) Honey/शहद
(d) Gasoline/गैसोलीन

Ans.(c)
Sol. ‘Viscosity’ of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. For liquids, it corresponds to the informal concept of ‘Thickness’. For example, Honey has a much higher viscosity than water.

Q10. Brass gets fade colour in air due to the presence of- 
किसकी उपस्थिति के कारण पीतल का रंग हवा में फीका हो जाता है?
(a) Oxygen / ऑक्सीजन
(b) Hydrogen Sulphide / हाइड्रोजन सल्फाइड
(c) Carbon dioxide / कार्बन डाइऑक्साइड
(d) Nitrogen / नाइट्रोजन

Ans.(b)
Sol. Hydrogen Sulphide is responsible for fading of Brass.

Q11. Human eye is most sensitive to visible light of the wavelength 
मानव आंख किस तरंग दैर्ध्य के दृश्यमान प्रकाश के प्रति अधिक संवेदनशील है?
(a) 655nm/ एनएम
(b) 555nm/ एनएम
(c) 455nm / एनएम
(d) 755nm / एनएम

Ans.(b)
Sol. Eye is most sensitive to yellow-green light that is light of wavelength 555nm.

Q12. The wave length extension of visible light is- 
दृश्यमान प्रकाश का तरंगदैर्ध्य विस्तार कितना है- 
(a) Between 200–900 nm / 200-900 एनएम के बीच
(b) Between 250–850 nm / 250-850 एनएम के बीच
(c) Between 300–800 nm / 300-800 एनएम के बीच
(d) Between 390–780 nm / 390-780 एनएम के बीच

Ans.(d)
Sol. Visible light is that part of electromagnetic radiation which can be seen by human eyes. A normal human eye can see the electromagnetic radiation between 390–780 nm of wavelength.

Q13. The speed of light will be minimum while passing through- 
किसके माध्यम से जाने के दौरान प्रकाश की गति न्यूनतम होगी-
(a) Glass /कांच
(b) Vacuum /निर्यात
(c) Water /पानी
(d) Air /हवा

Ans.(a)
Sol. Any of the object or material which has the highest refractive index has the minimum speed of light. The glass has the highest refractive index among other like, vacuum, water and air.

Q14. For shaving, one uses- 
शेविंग के लिए, ___________ का उपयोग किया जाता है –
(a) Concave mirror/अवतल दर्पण
(b) Plain mirror/समतल दर्पण
(c) Convex mirror/उत्तल दर्पण
(d) None of these/इनमें से कोई नहीं

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.

Q15. Which of the following lens is used to minimize Myopia? 
निम्न में से कौन सा लेंस निकट दृष्टि दोष (मायोपिया) को कम करने के लिए उपयोग किया जाता है?
(a) Convex lens/उत्तल लेंस
(b) Concave lens/अवतल लेंस
(c) Cylindrical lens/बेलनाकार लेंस
(d) None of these/इनमें से कोई नहीं

Ans.(b)

Q16. Which among the following has the maximum density?
निम्नलिखित में से किसका घनत्व अधिकतम है?
(a) Water/पानी
(b) Ice/बर्फ
(c) Ethylene/ एथिलीन
(d) Acetone/ एसीटोन

Ans.(a)
Sol. Water has maximum density.

Q17. What happens in an oxidation reaction?
ऑक्सीकरण प्रतिक्रिया में क्या होता है?
(a) Protons are lost./ प्रोटॉन कम हो जाते हैं
(b) Electrons are lost/ इलेक्ट्रॉन कम हो जाते हैं
(c) Neutrons are lost./ न्यूट्रॉन कम हो जाते हैं
(d) Electrons are gained./ इलेक्ट्रॉन प्राप्त होते हैं

Ans.(b)
Sol. Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.

Q18. The reactions in which oxidation and reduction occur simultaneously are called _______.
प्रतिक्रियाएं जिसमें ऑक्सीकरण और कमी एक साथ होती है उन्हें _______ कहा जाता है.
(a) Feral reactions/ फारल प्रतिक्रियाएं
(b) Redox reactions/ रेडॉक्स प्रतिक्रियाएं
(c) Demug reactions/ डीमग प्रतिक्रियाएं
(d) Kerol reactions/ केरोल प्रतिक्रियाएं

Ans.(b) 
Sol. A redox reaction is a type of chemical reaction that involves both oxidation and reduction simultaneously.

Q19. Who discovered Nitrogen?
नाइट्रोजन किसने खोजा?
(a) Faraday/ फैराडे
(b) Heisenberg/ हाइजेनबर्ग
(c) Hooke/ हूक
(d) Rutherford/ रदरफोर्ड

Ans.(d)
Sol. Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.

Q20. The percentage of water in an adult human body is around-
एक वयस्क मानव शरीर में पानी का प्रतिशत लगभग कितना होता है?
(a) 10%
(b) 30%
(c) 65%
(d) 75%

Ans.(c)
Sol. The amount of water in the human body ranges from 50-75%. The average adult human body is 50-65% water, averaging around 57-60%. The percentage of water in infants is much higher typically around 75-78% water, dropping to 65% by one year of age. Water is the best solvent in nature.

Q21.When the left ventricle in the human heart contracts, the blood moves to the –
जब मानव हृदय में बायाँ वेंट्रिकल सिकुड़ता है तब रक्त किस ओर चलता है?
(a) Brain/मस्तिष्क
(b) Pulmonary artery/फेफड़ा-धमनी
(c) Aorta/बड़ी धमनी
(d) Lungs/फेफड़े

Ans.(c)
Sol. When the left ventricle in the human heart contracts, the blood moves to the Arota. Blood leaves the heart through the aortic valve, into the aorta and to the body.

Q22. Glaucoma is a disease of the – 
ग्लूकोमा ________ कि एक बीमारी है
(a) Skin/त्वचा
(b) Lungs/फेफड़े
(c) Liver/जिग
(d) Eyes/आंखें

Ans.(d)
Sol. Glaucoma is a disease that damages your eye’s optic nerve. It usually happens when fluid builds up in the front part of your eye. That extra fluid increases the pressure in your eye, damaging the optic nerve.

Q23.Haemoglobin contains the metal –
हैमोग्लोबिन में शामिल धातु है:
(a) Copper/कॉपर
(b) Molybdenum/मोलिब्डेनम
(c) Iron/आयरन
(d) Magnesium/मैग्नेशियम

Ans.(c) 
Sol. Hemoglobin is made up of globin proteins and an iron(metal) rich compound called heme found in RBC involved in transport of oxygen. Each heme group contain iron which is responsible for binding of oxygen.

Q24. The life span of RBC of man is –
मनुष्य के आरबीसी का जीवन काल कितना है ?
(a) 120 days /दिन
(b) 150 days / दिन
(c) 180 days / दिन
(d) 190 days / दिन

Ans.(a)
Sol. The life span of RBC of man is 120 days.

Q25. A fan produces feeling of comfort during hot weather, because- 
एक पंखा गर्म मौसम के दौरान आराम की भावना पैदा करता है, क्योंकि –
(a) Fan supplies cold air/फैन ठंडी हवा की आपूर्ति करता है
(b) Our perspiration evaporates rapidly/हमारा पसीना तेजी से वाष्पित होता है
(c) Our body radiates more heat/हमारा शरीर अधिक गर्मी प्रसारित करता है
(d) Conductivity of air increase/वायु के प्रवाहकत्त्व में वृद्धि होती है

Ans.(b)
Sol. In summer, a ceiling fan in the counterclockwise direction can help to cool your home by pushing cool air down. During the hot summer months, though this wind chill effect can work to your advantage by providing a breeze that can help evaporate the skin’s moisture quickly, creating a cool feeling.

Q26. Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not? 
निम्नलिखित में से क्या यह पुष्टि करने के लिए उपयोग किया जा सकता है कि पीने के पानी में गामा उत्सर्जन आइसोटोप है या नहीं?
(a) Microscope/ माइक्रोस्कोप
(b) Lead plate /लीड प्लेट
(c) Scintillation counter / स्किनटीलेशनसरगर्मी काउंटर
(d) Spectrophotometer / स्पेक्ट्रोफोटोमीटर

Ans.(c)
Sol. Scintillation counter is an instrument for detecting ionizing radiation by using the excitation effect of incident radiation. Radiation on a scintillator material and detecting the resultant light pulses.

Q27. In an earthen pitcher, the water remains cold due to the process of 
मिटटी के घड़े में,किस प्रक्रिया की वजह से पानी ठंडा रहता है?
(a) Condensation /संक्षेपण
(b) Evaporation /वाष्पीकरण
(c) Sublimation /उर्ध्वपातन
(d) None of the above /उपरोक्त में से कोई भी नहीं

Ans.(b)
Sol. The water remains cold in an earthen pitcher because of a physical process is known as evaporation, when liquid changes to a gaseous (or vapour) state without boiling, it is known as evaporation. The earthen pitcher is made of mud and has many minute pores. It is through these pores that the water, placed inside the pitcher, oozes out. Now to evaporate, the water needs to absorb heat, which will change it to vapour. The only way the water oozing out of the pitchers can turn to vapour is by absorbing heat from the liquid within the pot. Due to this process of continuous absorption of heat from water inside the pot, in a few hours, this water becomes cool.

Q28. In the season of summer, we experience a humid heat when weather: 
गर्मी के मौसम में,किस दौरान हम एक आर्द्र गर्मी का अनुभव करते हैं?
(a) Start of summer / गर्मी की शुरुआत
(b) Middle of summer / गर्मी के मध्य
(c) high evaporation / उच्च वाष्पीकरण
(d) extreme temperature / अधिकतम तापमान
\

Ans.(d) 
Sol. In the season of summer, when the weather is humid, we experience humid heat.

Q29. Xeric condition refers to- 
ज़ैरिक स्थिति का संदर्भ है
(a) low temperature/कम तापमान
(b) low humidity/कम नमी
(c) high evaporation/उच्च वाष्पीकरण
(d) extreme temperature/अधिकतम तापमान

Ans.(b)
Sol. Xeric condition refers to low humidity. It is a challenging place with poor sandy soil, the extreme condition of rain and drought. Xeric environment is place where water is meager.

Q30. Cyclotrons are used to accelerate: 
साइक्लोट्रोंस का उपयोग किसे त्वरण प्रदान करने के लिए किया जाता है
(a) Neutrons / न्यूट्रॉन
(b) Protons/ प्रोटान
(c) Atoms / परमाणुओं
(d) Ions / आयनों

Ans.(b) 
Sol. Cyclotron is a machine used to accelerate charged particle such as alpha particles, deuteron, proton etc. up to a very high speed.