RRB NTPC SCIENCE PART 4

RRB NTPC SCIENCE PART-4

Q1.Energy stored in a coal is

कोयले में संग्रहीत ऊर्जा ______ होती है
(a)kinetic energy/ गतिज ऊर्जा
(b)potential energy/ स्थितिज ऊर्जा
(c)chemical energy/ रासायनिक ऊर्जा
(d)nuclear energy/ परमाणु ऊर्जा

S1.Ans.(c)
Sol. Chemical energy is stored in coal. Coal is a Hydrocarbon. When coal is burnt its chemical energy comes out in the form of light and heat energy which result in formation of vapors of Carbon Dioxide(CO2) and water(H2O).

Q2. In electromagnetic induction, the induced charge does not depend on –
विद्युत चुम्बकीय प्रेरण में, प्रेरित चार्ज किस पर निर्भर नहीं करता है –
(a) Change in flux / प्रवाह में बदलाव
(b) time of change of magnetic flux / चुंबकीय प्रवाह के परिवर्तन का समय
(c) Resistance of Coil / वक्र का विरोध
(d) None of the above /इनमें से कोई नहीं

S2.Ans.(b)
Sol. Induced charge does not depend upon time of change of magnetic flux, as Induced charge Q = n∆T∅R

Q3. Waves which do not require any material medium for its propagation is–
तरंगे जिनके प्रसार के लिए किसी भी भौतिक माध्यम की आवश्यकता नहीं होती है-
(a) Matter waves/ द्रव्य तरंगें
(b) Mechanical waves/ यांत्रिक तरंगें
(c) Elastic waves/ लोचदार लहरें
(d) Electromagnetic waves/ विद्युतचुम्बकीय तरंगें

S3.Ans(d)
Sol. Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

Q4. In modern periodic table, the number of period is
आधुनिक आवर्त सारणी में, अवधि की संख्या कितनी है?
(a) 2
(b) 6
(c) 7
(d) 8

S4.Ans(c)
Sol. There are seven periods in the periodic table.

Q5. Match List-I with List -II and select the correct answer using the codes given below the lists:
सूची-I का सूची-II से मिलान कीजिये और सूचियों के नीचे दिए गए कूट का उपयोग करके सही उत्तर का चयन कीजिये:
List-I / सूची-I List-II/ सूची-II
A. Distance / दूरी 1. Hertz / हर्ट्ज़
B. Energy / ऊर्जा 2. Light Year / प्रकाश वर्ष 
C. Intensity of sound / ध्वनी की तीव्रता 3. Joule / जूल 
D. Frequency / आवृत्ति 4. Decibel / डेसिबल

Codes:/कूट:
A B C D
(a) 2 3 4 1
(b) 1 2 3 4
(c) 2 3 1 4
(d) 2 1 3 4

S5.Ans.(a)
Sol. Light-year is a unit of length, joule is the unit of energy. Intensity of sound is measured in decibel. Frequency is measured in hertz (Hz).

Q6.Neutron was discovered by
न्यूट्रॉन किस के द्वारा खोजा गया था?
(a) J.J. Thomson/जे. जे. थोमसन
(b) Chadwick/चैडविक
(c) Rutherford/ रदरफोर्ड
(d) Priestley/ प्रीस्टलि

S6.Ans(b)
Sol. Neutron was discovered by James Chadwick. Sir James Chadwick was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.

Q7. The increasing order of acid strength of HCI, HI, HBr, HF is
HCI, HI, HBr, HF की एसिड ताकत का बढ़ता क्रम है-
(a) HCI < HI < HBr < HI
(b) HI < HCI < HBr < HF
(c) HF < HCI < HBr < HI
(d) None/ कोई नहीं

S7.Ans(c)
Sol. Hydrogen Iodine has the largest size, thus weakest bond with Hydrogen and hence largest acidity. The size of the anions increases the order is HF

Q8. A group of archaebacteria is used in the production of-

अर्चेबक्टेरिया का समूह किस के उत्पादन में उपयोग किया जाता है?

(a) Ethane / एटैन

(b) Methane / मीथेन

(c) Acids / एसिड

(d) Alchohols / अल्कोहल

S8.Ans.(b)
Sol. Archaebacteria sub-kingdom of the kingdom Prokaryote, which on the basis of both RNA and DNA. Archaebacteria have unique protein-like cell walls and cell membrane simple organic compounds such as methanol and acetate as food, combining them with carbon dioxide and hydrogen gas from the air and releasing methane as a byproduct.

Q9. The largest invertebrate is- 
सबसे बड़ा अकशेरूक है-
(a) Octopus / ऑक्टोपस
(b) Squid / स्क्वीड
(c) Coral / मूंगा
(d) Jellyfish / जेलिफ़िश

S9.Ans.(b)
Sol. Invertebrate is the animals that do not have a backbone. The colossal squid is the largest invertebrate. It’s maximum size is 12 – 14 metre.

Q10. Which one of the following pairs is no correctly matched? 
निम्न में से कौन से जोड़े सही ढंग से मेल नहीं खाते? 
(a) Vitamin A/विटामिन A – Night Blindness/रतौंधी
(b) Vitamin B_3/विटामिन B_3 – Pellagra / पेलाग्रा
(c) Vitamin D/ विटामिन डी – Colour Bindness/ रंग अंधापन
(d) B6/B6 -Anaemia/अनीमिया

S10.Ans.(c)
Sol. Colour blindness is a sex-linked genetic disorder. It does not relate to vitamin D. The deficiency of Vitamin A causes night blindness. Vitamin B3 is also called niacin . Its deficiency causes pellagra. The deficiency of folic acid causes anaemia.

Q1. ‘Dialysis’ is related to? 
‘डायलिसिस’ किस से संबंधित है?
(a) Liver /जिगर
(b) Kidney /गुर्दा
(c) Eyes /आंखें
(d) Brain / मस्तिष्क

Ans.(b)
Sol. Kidneys remove excess organic molecules from the blood. They serve the body as a natural filter of the blood and remove water-soluble wastes, such as urea and ammonium and they are also responsible for the reabsorption of water, glucose and amino acids.

Q2. Where is urea separated from the blood? 
यूरिया रक्त से कहां अलग होता है?
(a) Intestine /आंत
(b) Stomach /पेट
(c) Spleen /प्लीहा
(d) Kidney /गुर्दा

Ans.(d)
Sol. The process, ultrafiltration occurs at the barrier between the blood and the filtrate in the renal capsule in the kidney. The kidneys remove urea and other toxic wastes from the blood, forming a dilute solution called urine in the process.

Q3. The average blood flow through kidneys per minute is 
प्रति मिनट गुर्दे के माध्यम से औसत रक्त प्रवाह कितना है?
(a) 1000 cc
(b) 1200 cc
(c) 200 cc
(d) 500 cc

Ans.(b) 
Sol. Kidneys are the most important organ in our body. Our kidneys purify around 1500 litre of blood and convert it into approximately 1.5 litre urine per day. 1200 ml of blood flows through both the kidneys per minute and out of it 1 ml of urine is formed per minute.

Q4. When kidneys fail to function, there is accumulation of- 
जब गुर्दे कार्य करने में विफल हो जाता हैं, तो इसमें किसका संचय होता है-
(a) Fats in the body /शरीर में वसा
(b) Proteins in the body /शरीर में प्रोटीन
(c) Sugar in the blood /रक्त में शुगर
(d) Nitrogenous waste products in the blood /रक्त में नाइट्रोजनयुक्त अपशिष्ट पदार्थ

Ans.(d) 
Sol. Metabolism refers to all of the body’s chemical process, the digestion of food and the elimination of waste. The main nitrogenous wastes are urea and uric acid. Urea is formed from gluconeogenesis of amino acids. Urea is one of the primary components of urine.

Q5. The bones are held together by elastic tissues are called- 
लोचदार ऊतक द्वारा हड्डियों को एक साथ रखे जाने को क्या कहते है?
(a) Ligaments / स्नायुबंधन
(b) Fibrous tissues / रेशेदार ऊतक
(c) Fibrin / फाइब्रिन
(d) Muscular tissues / मांसपेशी ऊतक

Ans.(a)
Sol. A ligament is a tissue that connects two bones to form a joint. It is tough and fibrous which means that when it is formed, a ligament can take quite a while to heal and might even require surgery.

Q6. Gasohol is 
गैसोहोल क्या है?
(a) Ethyl alcohol + Petrol / एथिल एल्कोहल + पेट्रोल
(b) Natural gas + Ethyl alcohol / प्राकृतिक गैस + एथिल अल्कोहल
(c) Any gas dissolved in alcohol / अल्कोहल में विघटित कोई भी गैस
(d) Ethyl alcohol + Kerosene oil / एथिल एल्कोहल + केरोसिन तेल

Ans.(a)
Sol. Gasohol, a gasoline extender made from a mixture of gasoline (90%) and ethanol (10 % often obtained by fermenting agricultural crops) or gasoline (97%) and methanol or wood alcohol (3%). Gasohol has higher octane or antiknock properties by which it burns more slowly, coolly and completely.

Q7. ‘Pyrheliometer’ is used for measuring: 
’पाइरेलियोमीटर’ का उपयोग क्या मापने के लिए किया जाता है?
(a) Sun spots / सूर्य के धब्बे
(b) Solar radiation / सौर विकिरण
(c) Air temperature / वायु तापमान
(d) Temperature of plants / पौधों के तापमान

Ans.(b)
Sol. Mainly there are two types of devices that are used to measure solar radiations these are: (i) Pyrheliometer (ii) Pyranometer.

Q8. Tetraethyl Lead (TEL) is added to petrol: 
टेट्राएथिल लैड, पेट्रोल में क्यों मिलाया जाता है?
(a) To prevent it from freezing / इसे जमने से बचाने के लिए
(b) To increase its flash point / इसका फ़्लैश पॉइंट बढाने के लिए
(c) To increase its anti-knocking rating / इसकी एंटी-नॉकिंग रेटिंग बढ़ाने के लिए
(d) To increase its boiling point / इसका क्वथनांक बढानें के लिए

Ans.(c)
Sol. Tetraethyl Lead (CH3CH2)4Pb is the chief antiknock agent for automotive gasoline or petrol. In the hot cylinder of a gasoline engine, the bonds between the Lead atom and the Ethyl groups are broken. Upon combustion, the Lead atom forms Lead Oxide (PbO) which prevents fractions of the fuel mixture from burning too quickly and causing a highly undesirable “engine knock.” It is mixed with petrol to increase its anti-knocking rate.

Q9. Force of attraction between the molecules of different substances is called
विभिन्न पदार्थों के अणुओं के बीच के आकर्षण बल को क्या कहा जाता है
(a) Surface tension/सतह तनाव
(b) Cohensive force/संसक्त बल
(c) Adhesive force/आसंजक बल
(d) None of above/उपरोक्त में से कोई नहीं

Ans.(c)
Sol. Adhesive forces are the attractive forces between unlike molecules.

Q10. Of the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct? 
एक घर में दो बल्बों में से एक दूसरे की तुलना में अधिक चमकता है. इस संदर्भ में निम्नलिखित में से कौन सा कथन सत्य है?
(a) The brightness does not depend on the resistance. / चमक प्रतिरोध पर निर्भर नहीं है
(b) Both the bulbs have same the resistance. / दोनों बल्बों में समान प्रतिरोध है
(c) The bright bulb has larger resistance. / चमकदार बल्ब में प्रतिरोध अधिक है.
(d) The dim bulb has larger resistance. / कम जलने वाले बल्ब में प्रतिरोध अधिक है

Ans.(d)
Sol. The bulb which decays more energy will generate more brightness.
Power (P) = Voltage (V) × Current (I)
It is known that = V = I × Resistance (R)
P = V^2/R;P∝1/R Thus, the bulb of high resistance decays low energy and will generate dim light.