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Top 500 Science Questions For Airforce Navy 2022


Top 500 Science Questions For Airforce Navy 2022

WE are enclosing 500+ General Science Questions and Answers in English which contains MCQs from Physics, Chemistry and Biology. Many students were demanding this in the comment post of this post. So, we are providing it in a PDF file also, you can download it from the link given at the end of the article. 500+ General Science Questions and Answers in English are attached which contains MCQs from Physics, Chemistry and Biology. Many students were demanding this in the comment post of this post. So, we are also providing it in a PDF file, you can download it from the link given at the end of the article.

Top 500 Science Questions For Airforce Navy 2022
  1.  A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is
    conserved’? – Momentum
  2. Which mixture is homogeneous? – Methanol and water
  3. What is formed by strong heating of potassium petmanganate? – O2
  4. Most of the digestion occur in which part of alimentory canal of man? – Small intestine
  5. What is the Branch of biology in which we study about relationship between living and their
    environment? – Ecology
  6.  Why does a man inside an artificial satellite feels weightlessness? – Because the force of attraction due to earth is zero at that earth is
  7. Which has the longest wave length? – Infra red radiation
  8. Which plant produce seed but not fruit? – Mint
  9. When are positive ions are formed from neutral atoms? – By loss of electrons
  10. Which Bacteria convert atmospheric nitrogen into nitrogenous compound? – Nitrogen fixing bacteria
  11. If the ratio of the amplitudes of two waves is 4 : 3, then what will be the ratio of maximum and
    minimum intensity? – 49 : 1
  12. When the universal gas constant (R) is divided by Avogadro’s number (N), what is their ratio called?
    – Boltzmann’s constant
  13. Why is yeast is used in bakery in the preparation of bread? – Because it make bread soft and spongy
  14. Which variety of glass is used for the manufacture of optical glasses? – Flint glass
  15. Sex determination of child is done by whose chromosome? – Father
  16.  In a stationary longitudinal wave, nodes are points of which variation? – Maximum pressure
  17. Which crop enrich the soil with nitrogen? – Pea
  18. At constant temperature, the product of pressure and volume of a given amount of a gas is constant, whose this law? – Boyles’law
  19. If the amplitude of sound is doubled and the frequency reduced to one-fourth, what will the
    intensity? – Decrease by a factor of 4
  20. What is good source of protein ? – Soyabean
  21. The compressed gas available in cooking gas cylinder is a mixture of which gases? – C4H10 + C3H8
  22. What is the temperature at which the speed of sound in air becomes double of its value at 27°C? –
  23.  For television broadcasting. how much MHz frequency employed normally? – 30-300 MHz
  24. Which insect spreads kala-azar? – Sand fly
  25.  By which enzyme is Urea converted into ammonia and carbon dioxide? – Urease
  26. In the leaf of tobacco what is found? – Nicotin
  27.  Which property occurs in alkali metals? – Largest atomic radil
  28.  A number of images of a candle flame are seen in thick mirror which image will be brightest? – The second image is the brightest
  29.  Parthanogenesis is seen generally in which fruit? – Grapes
  30.  Inert gases (Except Helium) comes in which block in the periodic table? – p-block
  31.  Whose experiments proved that the speed of light was always the same? – Michelson and Marley
  32.  Why do Blood cells do not shrink in blood? – Because blood is isotonic
  33.  Which stem is modified to perform the function of leaf and many internodes called? – Phylloclade
  34.  What is the process of slow and homogeneous cooling of glass called? – Annealing of glass
  35. Which is largest cell organelles? – Plastid
  36. An endoscope is employed to view the internal parts of the body organ. It is based on the principle of which reflection? – Internal reflection
  37.  A solution contains 1 mole alcohol and 4 mole water. What will mole fraction of water and alcohal be? – 4/5 and 1/5
  38.  What is the process in which loss of water occurs in the form of water vapour through aerial part of plant? – Transpiration
  39. A strong magnetic field is applied on a stationary electron, then how will the electron? – Remains stationary
  40.  Why does Pure water not conduct electricity? – Because it is almost not ionised
  41.  Besides water and light which is more essential as a raw material for photosynthesis? – CO2
  42.  Why is the conduction of electricity through the electrolyte solution? – Due to movement of ions of electrolyte
  43.  Which fraction is obtained between temperature 150–300°C during fractional distillation of crude petroleum? – Kerosene
  44. What is the process of transfer of genetic information from DNA to RNA or formation of RNA from DNA? – Transcription
  45.  What is the Study of integrated use of microbiology, biochmistry and engineering? – Biotechnology
  46.  If a proton is brought towards an electron from infinity, how will the potential energy of the system? – Decrease
  47.  What is an example of emulsion? – Milk
  48.  Which system is formed by the interaction of a community of organisms with its environment? –
  49.  Which branch of science deals with the study of tissue found in the body of organism? – Histology
  50.  In the electrolysis the amount of mass deposited or liberated at an electrode is directly proportional to which thing? – Amount of charge
  51.  Activated charcoal is employed to remove colouring matter from pure substance, it work? –
  52.  Which substance is more than 80% in the cell? – Water
  53.  A horizontal cable carries a current from west to east. the direction of the magnetic field produced by the current at a point vertically above the wire is which side? – North to south
  54.  What is the Eosin used to detect the end point of precipitation titration by adsorption called? –
    Normal indicator
  55.  Which branch of science that deals with the study of law is genetics for the improvement of human race? – Eugenics
  56.  What is the bond between two amino acids in a protein? – Ester bond
  57.  What is the Study of inter-relationships between an entire community and its environment? –
  58.  Ophthalmology is the branch of science in which we study about which thing? – Eye
  59.  The process of converting hydrate Al2O3 into anhydrous aluminium is known as which name? –
  60.  Fluorescent tubes are fitted with a choke. What does the choke coil? – Reduces current in the circuit
  61. What is the second most common element in the universe? – Si
  62.  Entamoeba histolytica is found in which part of man? – Intestine
  63.  What is the maximum number of different electrical combination possible with three equal
    resistances? – 4
  64.  Which is the compound in that oxygen shows + 2 oxidation state? – F2O
  65.  The statements “Protoplasm is the physical basis of life” is given by which person? – Purkinje
  66. Purification of aluminium by electrolyte refining is known as which name? – Hoope’s process
  67.  Malaria parasite and Amoeba are grouped under? – Protozoa
  68. Magnetic dipole moment is a vector quantity directed from which direction? – South to north
  69. What is France’s global ranking in terms of the number of animal species under threat? – 8
  70. Which is the largest phylum in the animal kingdom in respect of number of species? – Arthropoda
  71. A large magnet is broken into two pieces. If the lengths of two pieces are in the ratio of 3 : 4. what is the ratio of their pole strengths? – 1 : 1
  72. Van arkel method of purification of metals involves converting the metal to which compound? –
    Volatile compound
  73. By whom was Tetrahedral nature of bonding in carbon atom first shown? – van’t Hoff and Le-Bel
  74. Which ancestor of man for the first time began the bipedal locomotion ? – Australopithecus
  75.  Which is the contractile protein muscle? – Myosin
  76.  Which is the compound in that oxygen shows –1 oxidation state is? – Na2O2
  77.  What is the reason of floating of the ore particles in concentration by froth floatation process? –
    Their being hydrophobic
  78.  What is also known as green protozo? – Euglena
  79.  If the electric current in a lamp decreases by 5% then the power output decreases by how many
    percentages? – 10%
  80.  Acid rain is caused due to emission of which gases into the atmosphere? – Oxides of nitrogen and sulphur
  81.  Which naturally occurring element in the rice husk makes it termite resistant? – Silicon
  82.  Which quantity remains constant in a step-down transformer? – Power
  83.  In the extraction of zinc the formation of blue flame is due to the burning of which gas? – CO
  84.  What number of essential amino acid is found in man? – 20
  85.  Which of the following potassium compounds is known as ‘Pearl ash’? – K2CO3
  86. By which is the amount of light entering into the eye controlled? – Iris
  87.  Over the last 100 years global sea level has risen by about howmany cm? – 10-12. 5 cm
  88.  Whose statement is this? “Algebraic sum of the current meeting at a node is zero”– – Kirchhoff’s law
  89.  What is formed when white phosphorus is heated at 540 K in the absence of air? – Red phosphorus
  90.  Which tissue help in keeping the body warm? – Fatty tissue
  91.  A particle of mass m and charge q travels from rest through a potential difference V. What is its final energy? – qV
  92. Why are elements of group I known as alkali metals? – Their oxides are alkaline
  93. In which organ carbohydrate is stored as glycogen? – Liver
  94. Which particle has the longest de Broglie wavelength if they are moving with same velocity ? – â particle
  95. Which pollutant is main product of automobile exhaust? – NO
  96.  If all plant of the world die than why will all animal ultimately die? – Due to Lack of oxygen
  97.  Why does Coagulation of blood not occur inside human body? – Due to presence of Heparin
  98.  Which oxide is amphoteric in nature? – SnO2
  99.  In methane molecule how are the four hydrogen atoms arranged? – As tetrahedral
  100.  What is an association of individuals of different species living in the same habitat and having
    functional interactions? – Biotic community
  101. What is the name of the scientist who stated that matter can be converted into energy? – Einstein
  102.  The isotopes of chlorine with mass number 35 and 37 exist in which ratio? – 3 : 1
  103. A gas is found to have the formula (CO)n. Its vapour density is 70. What must the value of n be? – 5
  104. Which law directly explains the law of conservation of mass? – Avogadro’s law
  105. To whom the credit for the discovery of transuranic element goes? – Seaborg
  106.  How many moles are there is 140 g of Si (atomic mass of silicon is 28)? – 5
  107. Which substance does not have a melting point? – Glass
  108. By which a mixture of sand and naphthalene can be separated? – sublimation
  109. An element X forms an oxide X03. What is the valency of X? – 6
  110. Sodium carbonate crystals lose water molecules. What is this property called? – Efflorescence
  111.  By whom was the law of constant proportions enunciated? – Proust
  112. What is the number of unpaired electrons in carbon atom? – 2
  113.  In an atom the order of filling up of the orbitals is governed by which principle? – Aufbau principle
  114.  Regarding the atom of a chemical element, magnetic quantum number refers? – Orientation
  115.  What are the atoms of the elements having same mass number but different atomic number called? – isobars
  116. Rutherford’s scattering experiment related to the size of which thing? – nucleus
  117.  By whom was the absolute value of charge on electron determined? – R.A. Millikan
  118. Which property of the elements is a whole number? – Atomic number
  119. Discovery of the nucleus of an atom was due to the experiment carried out by which person? –
  120. Rutherford
  121.  What are the atoms of the elements which have same number of neutrons called? – Isotones
  122.  Whose experiment proved that the speed of light was always the same? – Michelson and Morley
  123.  Which element has two electrons in the K-shell only? – Helium
  124. What is Electromagnetic radiation with maximum wavelength? – Radio waves
  125. Which nuclear particles responsible for holding all nucleons together? – Mesons
  126.  In which process, a nucleus spontaneously breaks down by emitting radiation? – Radioactive decay
  127. In atomic reactors, graphite is used as which name? – Moderator
  128.  Why is Cobalt-60 commonly used in radiation therapy? –Because it emits gamma rays
  129.  A radioactive substance has a half life of four months. Three-fourth of the substance would decay in howmany months? – 8 months
  130.  What is a bond formed by the transfer of electrons between atoms of the elements called? – ionic bond
  131. What is a bond formed by sharing of electrons between atoms of the elements called? – covalent
  132. bond
  133. What is the maximum number of hydrogen bonds in a H2O molecule? – 4
  134.  Select the compound in which chlorine shows oxidation state + 7? – HClO4
  135.  What is the oxidation of two Cl atoms in bleaching powder Ca(OCl) Cl? – +1,–1
  136.  What is the Oxidation state of Mn in acidic KMnO4 change from? – +7 to +2
  137. Why is Molten NaCl good conductor of electricity? – Free ions
  138. What is the common oxidation state of alkali metals in the combined state? – +1
  139. What is the oxidation number and covalency-of sulphur in S8? – 0, 2
  140. Starch iodide paper is used to test for the presence of which agent? – Oxidising agent
  141. The pH of water at 25° C is 7. When it is heated to 100°C, what will the pH of water? – increases
  142. When Metal carbonate reacts with dilute acids, what does it forms? – CO2
  143. The element common to all the acids is known as which name? – Hydrogen
  144.  What is the sum of pH and pOH in aqueous solution at 25°C? – 14
  145. By what factor is a solution with pH = 2 more acidic than one with pH = 6 ? – 104
  146.  Red litmus paper is changed into blue in solution of which thing? – Base
  147.  What is formed by dissolution of base or acid in water? – Exothermic
  148.  Blue litmus paper is converted into red in solution of which thing? – acid
  149. According to Arrhenius theory of an acid and base, an acid is a substance that gives which ions in
  150. water? – H+ ions
  151. What is the negative logarithmic value of hydrogen on called? – pH
  152. What are the physical state of dispersion medium of a cloud ? – Gas
  153. Vander Wall’s equation explains the behaviour of which gases? – real gases
  154. In general gas equation, pV= nRT, V is the volume of which gas? – n mole of a gas
  155. What is the ratio of rate of diffusion of oxygen and hydrogen? – 1 : 4
  156. Absolute zero is the temperature where all gases are expected to have howmuch volume? – Zero
  157. volume
  158. 4.4 g of CO2 contains how many litre of CO2 at STP? – 2.24 litre
  159. Glucose or fructose is converted into C2H5OH in the presence of which thing? – zymase
  160. Which type of materials act as effective catalysis? – Transition metals
  161. What is the substance which decreases the rate of a chemical reaction? – Poison
  162. TEL minimise the knocking effect when mixed with petrol, how does it act? – As negative catalyst
  163. Which is the catalyst used in the manufacture of sulphuric acid by contact process? – V2O5
  164. Which catalyst is sensitive to temperature changes? – Enzyme
  165. Which is the temperature at which the catalytic activity of the catayist is maximum? – Optimum
  166. temperature
  167.  Alcoholic fermentation is brought about the action of which thing? – Yeast
  168. Which is catalyst used in the Deacon’s process for the manufacture of chlorine? – CuCl2
  169.  In the Ostwald’s process for manufacture of HNO3, which catalyst is used? – Pt
  170. Which gas has maximum colorific value? – Oil gas
  171.  When ammonium chloride is dissolved in water, the solution becomes cold. Whiat is change? –
  172. Endothermic
  173. When ice melts into water, which type of change occurs in entropy? – Increases
  174.  In which type of coal percentage of carbon is the highest? – Anthracite
  175.  What is the mixture of carbon monoxide and nitrogen called? – Producer gas
  176.  What is the mixture of carbon monoxide and hydrogen called? – Water gas
  177. Which law of thermodynamics introduces the concept of entropy? – Second law
  178. For which element, the standard enthalpy is not zero? – C (Diamond)
  179. Which fuel causes minimum environmental pollution? – Hydrogen
  180. Which gas has the highest fuel value? – Hydrogen
  181. The compound with negative heat of formation is known as which name? – Exothermic compound
  182. Which hydrocarbon is mainly present in gobar gas? – Methane
  183. What happens when the door of a refrigerator is kept open? – Room heated
  184. What does the second law of thermodynamics introduced? – The concept of Entropy
  185. What is an extensive property of the system? – Volume
  186. A gas expands isothermally and reversible. How much work is done by the gas? – Maximum
  187. About which is the information not conveyed by thermodynamics? – Rates of reactions
  188. Which is the element that has the highest first ionization potential? – Nitrogen
  189. What has the highest ionization potential? – Ne
  190. Which of the following among alkali metals is most reactive? – Cs
  191. Which is the element having lowest melting point in periodic table? – He
  192. Which are the elements on the right side of the periodic table? – Non-metals
  193. Which transition metal is in liquid state? – Mercury
  194. Which electronic configurations exhibits metallic character? – 2, 8, 2
  195. Which element has the lowest electron affinity? – Argon
  196. By whom was the calculation of electronegativities first done? – Pauling
  197. Which element does not exist in liquid state at room temperature ? – Na
  198. What is the most electropositive amongst the alkaline earth metals? – Barium
  199. Which block of elements is mostly metals with high B.P., M.P. values? – d-block
  200. Which are the vertical lines in modern periodic table called? – Group
  201. What is horizontal line in modern periodic table called? – Period
  202.  In a period, the elements are arranged in which order? – Increasing charges in the nucleus
  203.  Which noble gas does not have octet of electrons in its outer shell? – He
  204. Which pair of elements is in the same period of the periodic table? – Na, Cl
  205. Why is the electron affinity of chlorine highest than that of fluorine? – Smaller nuclear charge
  206.  What is the Electron affinity of noble gases? – Almost zero
  207. Which mirror is to be used to obtain a parallel beam of light from a small lamp ? – Concave mirror
  208. The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens? – + 20 D
  209. When viewed in white light, why do soap bubbles show colours? – Because of interference
  210. Angular separation between two colours of the spectrum depends upon which thing? – Angle of
  211. deviation
  212.  Total internal reflection of light is possible when light enters from which thing? – Water to air
  213. Which is used to remove astigmatism for a human eye? – Cylindrical lens
  214. Why does diffusion of light in the atmosphere take place? – Due to dust particles
  215. Which phenomena can not be attributed to the refraction of light? – Redshift
  216. Total internal reflection can take place when light travels from which thing? – Diamond to glass
  217.  The refractive index of a given piece of transparent quartz is greatest for which light? – Violet light
  218. A virtual image larger than the object can be formed by which mirror? – Concave mirror
  219.  If there were no atmosphere, what will be the length of the day on the earth? – Decrease
  220.  The focal length of a convex lens is 50 cm. what is its power? – +2 D
  221. For an astronaut in a space ship, how does the sky appear? – Black
  222.  Which phenomena is used in optical fibres? – Total internal reflection
  223.  What is the phenomenon of splitting white light into seven colours? – Dispersion
  224.  Critical angle is minimum when a light ray passes which thing? – Glass to air
  225.  If the angle between two plane mirrors is 60°; then how many number of image will be formed? – 5
  226.  In which part of the eye lies the pigment, that decides the colour of the eyes of a person? – Choroid
  227.  Critical angle of. light passing from glass to water is minimum for which colour? – Violet colour
  228. To an observer on the lunar surface, during the day time, how will the sky appear? – Black
  229. What is the unit of luminous efficiency of an electric bulb? – Lumen / watt
  230.  Which of light are strongly absorbed by plants? – Blue and red
  231.  A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens? – +3.0 D
  232.  How many image can a man see if he stands between two plane mirrors inclined at an angle of 60°? – 5
  233.  How is image formed on the retina of a human eye? – Real and inverted
  234.  The resistance of material increases with temperature. What is this? – Metal
  235.  When do all the magnetic materials lose their magnetic properties? – Strongly heated
  236.  What is the relative permeability of a paramagnetic material? – Greater than unity
  237.  A soap bubble is given negative charge then what happen in its radius? – Increases
  238.  How is the relative permeability of a diamagnetic material? – Less than unity
  239.  How are the magnetic field lines in the middle of a solenoid? – Parallel to the axis
  240.  Why do Electricians use rubber gloves while working? – Rubber is an insulator
  241.  What work is work done in moving a positive charge on an equipotential surface? – Zero
  242. Kirchhoff’s voltage law is based on the law of conservation of which thing? – Energy
  243.  Why is In a hydel station the motion produced in turbines? – Due to the flow of water
  244.  What is most suitable for the core of an electromagnet? – Soft iron
  245.  At a grid sub stations the voltage is stepped up to reduce loss of which thing? – Power
  246. Equal charges are given to two spheres of different radii. What will the potential be? – More on
  247. smaller sphere
  248. Two electron beams are travelling parallel to each other. What will be their reactions? – Repel each other
  249. Instrument used to store the electric charge is known by which name? – Capacitor
  250. When an ebonite rod is rubbed with fur, which charge acquired by the fur? – Positive
  251. Conversion of chemical energy into electrical energy occurs in which thing? – Battery
  252. What is the temperature at which a ferromagnetic material becomes paramagnetic? – Curie
  253. temperature
  254.  A magnetic needle is kept in non uniform magnetic field. What does itexperiences? – A force and a torque
  255. Where will be the Time period in a vibration magnetometer infinite? – At magnetic pole
  256. The north pole of the earth’s magnet is near the geographical which direction? – South
  257. If the current in the core decreases, what will the strength of the magnetic field be? – Decreases
  258. The intensity of a magnetic field is defined as the force experienced by which pole? – Unit north pole
  259.  If a material, placed in a magnetic field is thrown out of it, then how is the material? – Diamagnetic
  260. The capacity of a pure capacitor is 1 farad. In D.C. circuit, what will its effective resistance be? –
  261. Infinite
  262.  If a bar magnet is cut length wise into 3 parts, what will the total number of poles be? – 6
  263. For electroplating a spoon, it is placed in the voltameter at which postion? – The position of cathode
  264.  A substance, when inserted between the poles of a magnet, is pushed out, what is it? – Diamagnetic
  265.  By inserting a soft iron piece into solenoid, what does the strength of the magnetic field? – Increase
  266. The magnetic induction associated with currents flowing in a hollow copper tube, how will be? –
  267. only out side
  268.  How is the electric potential at the centre of a charged conductor? – Same as on the surface
  269.  What is not the cause of low conductivity of electrolyte? – Ionisation of salt
  270.  What is Electric field intensity at a point a hollow charged spherical conductor? – Is zero
  271.  Which property is processed by the ferromagnetic substance? – Hysterasis
  272. Which type of cell can be used if a device requires 75 A of current for 15 seconds? – Lead-acid cell
  273.  A hydrogen atom is paramagnetic. What is a hydrogen molecule? – Diamagnetic
  274.  In nuclear fission, how many percentage of mass is converted into energy? – 0.1%
  275.  X210 has half life of 5 day. What is the time taken for seven-eights of sample of X210 to decay? – 15 days
  276. If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced? – Stable
  277.  What is the half-life of a radioactive element which has only 1/32 of its original mass left after a
  278. lapse of 60 days? – 12 days
  279.  If a proton of mass m is moving with the velocity of light, what will its mass be? – Infinite
  280.  What was the fissionable material used in the bomb dropped at Nagasaki (Japan) in the year 1945? – Plutonium
  281. Energy transferred to a person through gamma rays is measured in by which unit? – Roentgens
  282.  Which field is used to produce deflection in a television picture tube? – A magnetic fields
  283.  The electron emitted in beta radiation originates from where? – Inner orbits of atoms
  284.  From which the cathode ray particles originate in a discharge tube? – Cathode
  285.  Einstein’s mass energy relation is given by which expression? – E = mc2
  286.  Which rays will deflect in electric field? – Cathode rays
  287.  What percentage of the original quantity of a radioactive material is left after five half lives
  288. approximately? – 3%
  289.  What is the important conclusion given by Millikan’s experiment about the charge? – Charge is
  290. quantized
  291.  What are Alpha rays emitted from a radioactive substance? – Helium nuclear
  292.  Which are the Particles that can be added to the nucleus of an atom without changing its chemical properties? – Neutrons
  293.  Which particle has similar mass to that of the electron? – Positron
  294.  When the speed of electrons increases, then what happens in the value of the specific charge on an electron? – Decreases
  295. The colour of the +ve column in a gas discharge tube depends on which thing? – The gas in the tube
  296. The first explosion of an atomic device in India was carried out in which state? – Rajasthan
  297. Direct conversion of solar energy with the use of photovoltaic cell results in the production of which energy? – Electrical energy
  298. Why is energy is continuously generated in the sun? – Due to nuclear fusion
  299.  What is the ratio of specific charges of an á-particle to that of a proton? – 1/2
  300.  Long distance short-wave radio broad casting uses which waves? – Ionospheric wave
  301.  Which satellite is used in ship-to-shore and shore-to-shore and shore-to-ship communication? –
  302. Marisat
  303.  Which is electrical circuits used to get smooth de output from a rectified circuit called? – Filter
  304.  When the temperature of semiconductor is increased, what will happen in its electrical conductivity? – Increases
  305.  With the rise of temperature, what will happen in the specific resistance of semiconductor? –
  306. Decreases
  307.  The absorption of radio waves by the atmosphere depends on which thing? – Their frequency
  308.  Which are the space waves are affected seriously by atmospheric conditions? – UHF
  309.  With which can Radio wave of constant amplitude be generated? – Oscillator
  310.  What is the electrical circuit used to get smooth DC output from a rectifier circuit called? – Filter
  311.  If germanium has to be doped with a donor impurity, how should the foreign atom be? –
  312. Pentavalent
  313.  In a p-type semiconductor, Which are the majority charge carriers? – Holes
  314. The unidirectional property of a pn-junction is useful for its use as which thing? – Rectifier
  315. Which energy of the electron at absolute zero is called? – Fermi energy
  316.  For television broadcasting, what frequency is employed normally? – 30-300 MHz
  317. A zener diode is also a p – n junction diode. It can be used as which regular? – DC voltage regulator
  318.  Which effect shows particle nature of height? – Photoelectric effect
  319. A particle is executing S.H.M. Then what is the graph of acceleration as a function of
  320. displacement? – Hyperbola
  321. An atom has 7 electrons in its M-shell and contains 18 neutrons in its nucleus. What is its
  322. mass number? – 35
  323.  The medicine ephedrin used in the treatment of cough, asthma and bronchitis, from where is
  324. obtained? – Ephedra
  325.  By whom was the concept of dual nature of radiation proposed? – de-Broglie
  326. In a bisexual flower if androcium and gynoecium mature at different time the phenomenon is
  327. known as which name? – Dichogamy
  328. A small drop falls from rest from a large height h in air. What is the final velocity? – Almost
  329. independent of h
  330.  Why does Molten sodium chloride conduct electricity? – Due to the presence of free ions
  331. Which modification of root does not store food? – Stilt
  332.  The total energy of a particle vibrating in S.H.M. is proportional to which thing? –The square
  333. of its Amplitude
  334.  A body rolling freely on the surface of the earth eventually comes, why does it to rest? –
  335. Because it suffers friction
  336. What is the a biological process in which glucose and fat is oxidised to librate energy? –
  337. Respiration
  338. What is an example of Miscelles System here? – Soap + Water
  339. A gale blows over a house. The force due to the gale on the roof is in which direction? – In
  340. the upward direction
  341.  Why is Ail aqueous solution of copper sulphate is acidica in nature? – Because the salt
  342. undergoes hydrolysis
  343.  Oxygen released during photosynthesis of green plant comes from the breakdown of which
  344. thing? – Water
  345. The pressure at the bottom of a liquid tank does not depend on which area? – Area of the
  346. liquid surface
  347.  Which compound transforms baking soda into baking powder? – KHC4H4O6
  348.  Water will be absorbed by root hairs, then how is when the external medium? – Hypotonic
  349.  Why is Weightlessness experienced in spaceship? – Due to absence of gravity
  350.  How is Perchloric acid prepared? – By the action of Concentrate sulphuric acid on potassium perchlorate
  351. What is the Study of system of animal body which protects it from infection of various
  352. disease? – Immunology
  353. A particle revolves round a circular path with a constant speed, how is the acceleration of
  354. the particle? – Along the radius
  355. Which is the Branch of science that deal with the improvement of human race by providing
  356. better environmental condition? – Euthenics
  357. Aluminium surface are often ‘anodized’. This means deposition of a layer of which oxide? –
  358. Zinc oxide
  359. Which Animal is also known as ‘Portuguese man of war’? – Physalia
  360.  Which metal is extracted by thermal reduction process? – Copper
  361.  An ideal liquid flows through a horizontal tube of variable diameter. The pressure is lowest
  362. and what will be velocity? – Velocity is highest
  363.  If a non-metal is added to the interstitial sites of a metal, then how does the metal become?
  364. – less malleable
  365.  Which is used as a gift in Japan? – Euplectella
  366. A gas is enclosed in a container which is then placed on a fast moving train. What will be the
  367. temperature of the gas? – Remain unchanged
  368. When will a hot body radiate maximum energy? – If its surface is black and rough
  369.  How many electrons are involved in the oxidation by KMnO4 in basic medium? – 4
  370. Which chemical substance secreted by particular species of animal to attract another
  371. member of same species? – Pheromones
  372. How is the heat transferred by the radiator of a refrigerator? – More than that at the
  373. freezer
  374.  Which compound of zinc is white when cold and yellow when hot? – ZnO
  375.  Pheretima posthuma is scientific name of which animal? – Earth worm
  376.  Merscuric sulphide dissolves in aqua-regia to form which compund? – HgCl2
  377.  An individual whose blood type is B may in an emergency donate blood to a person which
  378. blood groups? – AB or B
  379.  If the amplitude of a wave at a distance t from a point source is A, what will be the
  380. amplitude at a distance 2r? – A/2
  381.  In which sequence are the electromagnetic radiations in decreasing order of wave lengths?
  382. – Infrared, radio, X-rays, visible
  383.  Salts of which element provide colours to fireworks? – Strontium and barium
  384.  Which organ have the capacity of regeneration? – Liver
  385. With the increase in temperature, what happens in the frequency of the sound from an
  386. organ pipe? – Increases
  387. What is obtained when cadmium chloride is treated with water? – Cd(OH)2
  388. Which organ cannot be transplanted? – Brain
  389.  When a coin placed in a bowl of water is seen from above, how does it appears? – Raised
  390. from its position
  391.  What is formed when cadmium reacts with H2S? – CdS
  392.  Appetite and satiety centres of brain, where are present in? – Hypothalmus
  393.  Which gland disapear during old age? – Thymus
  394.  How is the matallic nature of transition elements is than that of alkali metals? – Less
  395.  Which types of waves are used in a night vision apparatus? – Infra-red-waves
  396.  When seen in green light, what will the saffron and green portions of our national flag
  397. appear? – Black and green respectively
  398.  The 3d transition series contains how many elements from atomic number? – 21 to 30
  399.  Which blood group is universal doner? – O
  400.  Which lanthanides are used in glass, blowers, goggles? – Pr, Nd
  401.  Why is the function of the collimator in a spectrometer? – To obtain a parallel beam of light
  402.  What is the smallest structural and functional unit of nervous system? – Neuron
  403.  Which compound is obtained when auric chloride reacts with sodium chloride? – Na[AuCl4]
  404.  What is systolic and diastolic pressure in a healthy man? – 120 mm and 80 mm
  405.  The refractive index of a piece of transparent quartz is the greatest for which light? – Violet
  406. light
  407.  Which part of human brain is the regulating centre for swallowing and vomating? – Medulla
  408. oblangata
  409.  By which Carbon and hydrogen are estimated in organic compounds? – Liebig’s method
  410.  If the refractive angle of a prism is 60° and the minimum deviation is 30°, then the angle of
  411. incidence is how many degrees? – 45°
  412.  What is present both in plant and animal? – Plasma membrane
  413. What does mixture of CS2 and H2S on passing over heated copper give? – Methane
  414. If the rotational velocity of a dynamo armature is doubled, what will then the induced emf?
  415. – Become double
  416.  Which is used in storage batteries? – Lead
  417.  What is the name of the poisonous gas formed by the interaction of acetylene and arsenic
  418. trichloride? – Lewisite
  419.  Which tissue take part in healing the wounds? – Epithelium tissue
  420.  When a body is earth connected, electrons from the earth flow into the body. What is its
  421. mean? –This means the body is Charged positively
  422. Acetylene is used as an anaesthetic under which name? – Narcylene
  423. In daily requirement basis which vitamin is required in largest quantity by the human body?
  424. – Vitamin C (Ascorbic acid)
  425. When does not No current flows between two charged bodies? – If they have same
  426. potential
  427. Denatured spirit is a mixture of ethyl alcohol, methyl alcohol and which other thing? –
  428. Pyridine
  429. Consumption of fish is considered to be healthy compared to flesh of other animals why? –
  430. Because it contains polyunsaturated fatty acids
  431.  What is the reason for excessive solubility of ethyl alcohol in water? – Due to hydrogen
  432. bonding with water
  433.  Through which are the characters are transferred from parents to progeny? – DNA
  434.  A radioactive substance has a half life of 4 months. In how many months will three fourths
  435. of the substance will decays? – 8 months
  436.  The cause of fractional atomic weights of elements? – The presence of Isotopes
  437.  Which gas, is used for artificial ripening of fruit? – C2H4
  438.  Which branch of biology deal with the study of heredity? – Genetics
  439.  The maximum number of photo electrons released in photocell is independent of which
  440. thing? – Frequency
  441.  A fruity smell is produced by the reaction of C2H5OH with which formula? – CH3COOH
  442. By which can Evolutionary development of a species be best studied? – Studying fossils of
  443. this species
  444.  What is the process by which vegetable ghee is manufactured? – Hydrogenation
  445.  Early atmosphere contained methane and other hydrocarbons they have been now
  446. replaced by which gas? – Carbon dioxide
  447.  For an electric dipole, how are the field at a point on the equatorial line and the dipole
  448. moment? – In opposite direction
  449.  Crop sown soon after the onset of south-west monsoon in India, what is this called? – Kharif
  450. Thermal decomposition of alkanes is known as which name? – Cracking
  451. If a diamagnetic substance is brought near north and south pole of a oar magnet, what will
  452. be then? – It is Repelled by poles
  453. What is a glass sided tank, bowl in which aquatic animals live? – Aquarium
  454. Deficiency of which vitamin causes xerophthalmia? – Vitamin A
  455.  If a wire of resistivity p is stretched to double its length, then what will change in its new
  456. resistivity? – Not change
  457. Cathode rays enter an electric field normal to the lines of force. Then how is their path in
  458. the electric field is – Parabola
  459. The word “biodiversity” is a combination of which two words? – Biology and diversity
  460.  Which thing is the sweetest natural sugar? – Lactose
  461. Jaundice in human beings affects which of the body part? – Liver
  462.  How many orangutans disappear each year as result of palm oil farming? – 5000
  463.  The sky wave propagation is suitable for radio waves of frequency form how many MHz? –
  464. From 2 MHz to 30 MHz
  465. . Which is considered a hot-spot of biodiversity in India? – Western Ghats
  466. Trunk of tree increases in grith due to cell division in which tissue? – Meristematic tissue
  467. Which tissue in cells have lost the capicity of cell division? – Permanent tissue
  468. Which scientist studied about wheat rust problem? – K. C. Mehta
  469. Most of the plants obtain nitrogen from the soil in which from? – Nitrates
  470. Which fungus is responsible for disease late blight of potato? – Phytophthora infestans
  471. Which is responsible for red rot of sugarcane? – Collectorichum falcatum
  472. Which stage of development of insect is most harmful for crop? – Caterpillar
  473. In India famous Bengal famine accurred in 1942 by which disease? – Leaf spot of rice
  474. Which factors are most responsible for disease in plant? – Fungi
  475. Which fungus is responsible for the tikka disease of groundnut? – Cercosplora personata
  476. Which animals who have constant body temperature? – Homeothermic
  477. What is treatment of body defects through massage and exercise? – Physiotherapy
  478. What is making interesting discoveries unexpectedly or by accident? – Serendipity
  479. What is Study of growth and development of embryo? – Embryology
  480. Which branch of biology is concerned with study and function of internal organ of
  481. organism? – Physiology
  482. Which branch of science deal with the study of causative agent of disease? – Etiology
  483. What is the Study of pulse and arterial blood pressure called? – Sphygmology
  484. Which branch of biology deals with the study of processing and preservation of food? –
  485. Food technology
  486. What is the Study of the effects of toxic chemical substance on animal and plant? –
  487. Toxicology
  488. What is the Branch of science which deals with the study of skin of man? – Dermatology
  489. The release of which fish into wells helps in controlling the mosquitoes? – Gambusia fish
  490. Which animal lays eggs and does not produce young ones directly? – Echidna
  491. How many pair of heart is found in an earthworm? – Four
  492. Which substance found in blood which helps in cloting? – Fibrinogen
  493. Which worm reach into intestine of human by eating leaf? – Tape worm
  494. Which is the phylum that includes exclusively marine animal? – Echinodermata
  495. Which organs has its own wave of autonomic excitation? – Heart
  496. What is the short upper part of human intestine next to the stomach? – Duodenum
  497. A person feel fatigued due to depositon of which acid in their muscles? – Latic Acid
  498. In the retina of eye cells what is present for colour differentiation? – Cones
  499. Which gland is responsible for the secretion of insulin? – Pancrease
  500. What is considered as the easily digestable source of protein? – Soyabean
  501. What percentage of water found in blood plasma of human? – 91 to 92%
  502. Which blood vessel bringing blood into Bowman’s capsule? – Afferent arteriole
  503. Bu which antibodies are produced in the plasma of blood? – Lymphocytes
  504. Which enzyme take part in digestion of milk protein? – Rennin
  505. Which part of brain is centre of thirst hunger and sleep? – Hypothalmus
  506. Blood Coagualtion is prevented by which chemical when it flow through artery and vein? –
  507. Heparin
  508. Which organelles in the cell, other than nucleus contains DNA? – Mitochondria
  509. What is infolding from the inner membrane of mitochondria called? – Cristae
  510. In a living cell what is the site of ribosome formation? – Nucleolus
  511. What do both respiration and photosynthesis require? – Cytochromes
  512. In absence of ribosome in cell which function does not takes place? – Protein synthesis
  513. Deficiency of which vitamin, causes xerophthelmia? – Vitamin A
  514. Which antimicrobial drug is suitable for treatment of both tuberculosis and leprosy? –
  515. Rifampicin
  516. Insects that can transmit diseases to human are referred to as which name? – Vectors
  517. Pneumoconiosis affects the workers who work mainly in which industry? – Coal mining
  518. industry
  519. Lathyrism is caused by excessive consumption of which thing? – Khesari Dal
  520. Which part of blood carry out the function of body defence? – White blood cell
  521. Which disease is caused due to presence of excess arsenic in water? – Skin Cancer
  522. What is the transmission of characters from one generation to next? – Heredity
  523. Who got noble prize for artificial synthesis of DNA? – Kornberg
  524. What is the smallest part of DNA that undergoes recombination? – Recon
  525. By whom was Artificial gene synthesis first done in laboratory? – Khurana
  526. By whom the concept of survival of the fittest as advanced? – Herbert Spencer
  527. From the evolutionary point of view, which is the most primitive animal? – Turtle
  528. Which was the Russian scientist who proposed the theory of origin of life? – Oparin
  529. Who published the book ‘Origin of species by natural selection in 1859’? – Darwin
  530. Which is most primitive ancestor of man ? – Australopithecus
  531. Which harmful element tobacoo exists in tobacoo ? – Nicotine
  532. What is abiotic component of ecosystem? – Water
  533. What is Study of inter relationship between living organism and their environment? –
  534. Ecology
  535.  Epiphytes are plant which depend on other plants for which purpose? – Mechanical support
  536. What amount of energy transfered from one trophic level to next? – 10%
  537. Plant and animal living in a particular area, what is it called? – Community
  538. Reduced leaves and sunken stomata are the main feature of which thing? – Xerophytes
  539. What ratio of forest area needed for ecologycal balance in India? – 33.3%
  540. Ultimate environmental hazard to mankind, why? – Due to Nuclear pollution
  541. Sound become hazardous noise pollution at which level? – Above 80 dB
  542. Which energy do not have the problem of pollution? – Sun
  543. Which air pollutant affect the nervous system of man? – Lead
  544. By which is the Atmosphere of big metropolition cities is polluted most? – Automobile
  545. exhausts
  546. National Environmental Engineering research institute is situated in which city? – Nagpur
  547. Edward Jenner is related with which disease? – Small pox
  548. Which Scientist first explained about circulatory system? – William Harvey
  549. Who discovered Anopheles mosquito transmit malaria? – Ronal ross
  550. Who discovered the causal organism of the disease Anthrax? – Robert Koch
  551. Which Scientists has established the ‘Phylum Annelida’? – Lamark
  552.  Which Biologist proposed the theory of Germ plasm? – Weisman
  553. For which is the southern blot technique used for the detection? – DNA
  554. For which is the northern blot technique used for the detection? – RNA
  555. What is the introduction of foreign genes for improving genotype? – Immunisation
  556. Which vitamin is transformed in golden rice ? – Vitamin A
  557. Human protein x –1 – antitrysin is used for which disease? – Emphysama
  558. Which type of cell has the ability to develop into any type of all ? – Stem cell
  559. What is the percentage of land area covered under forest according to Indian Forest policy?
  560. – 33%
  561. Which organisation is responsible for maintaing Red data book? – IUGN
  562.  What is the main cause of extinction of species from tropics? – Deforestation
  563. What is the number of plant species estimated to be present in India? – 40,000
  564. Which group has the highest number of endangered species ? – Reptiles
  565. Silent valley having rare plant and animal is located in which state? – Kerala
  566. Which is the first national park established in India? – Corbet
  567. Insectivorous plant generally grow in soil which is deficient in which gas? – Nitrogen
  568. What is one-way relationship where one species benefits at the expense of another is
  569. called? – Parasitism
  570. What is symbiotic relationship in which both species benefit’ is best described? – Mutualism
  571. Which of a species describes the tropic function it fills in its environment? – Niche
  572. What is the least influential in determining the distribution of terrestrial biomes? – Salinity
  573. What is the term for the maximum number of individuals that an area can support
  574. indefinitely? – Carrying capacity
  575. The massive hole in the ozone layer over the Antarctica was first discovered in which year?
  576. – 1985
  577. Which animals have a diet mainly consisting of bamboo? – Red pandas
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