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1., 2., 3., 4., 5., 6., , 7., 8., 9., 10., , 11., 12., 13., , 14., 15., , 16., 17., 18., , 19., 20., 21., , 22., 23., , 24., 25., , Two vectors are equal if their- shape direction, is same., What type of force acts on a car moving on a, circular curved path - Centripetal force, On what principle does the washing machine, work – decentralization, Under what conditions will the maximum weight, of an object be on- the earth's pole, What is an air pressure measuring instrument, called – barometer, Why the weightlessness is felt when the, spacecraft revolves around the Earth - zero, gravity, What principle does the segmental Libra work on, - the Hook rule, Why the Earth has its own atmosphere - due to, the force of gravity, What is the stopping force of a vehicle when, applying a brake - friction force, Sea water has more salts than rain water because, - rivers carry salts from the earth and pour it, into the sea., What is the stored heat energy stored during the, change of heat in a substance - kinetic energy, photon whose basic unit is- Light, Due to which huge amount of energy is released, in the explosion of a nuclear bomb- the change, of neutrons to protons, Which has maximum mass- neutron, What is the example of the motion of the body, around a circular path - uniform vein, variable, acceleration, What principle does the rocket work on Newton's Third Law, What causes clouds to float in the atmosphere low density, Why the speeding wheel is an important part of, the steam engine - helps the engine to keep the, speed the same., What is the freezing point of fresh water - 0'C, In which a real gas can act as an ideal gas - low, pressure and high temperature, What is the example of the speed of the wheels, of a bullock cart while walking on the road Transitional and rotational speed, With whose help the purity of a metal can be, determined - Archimedes' principle, When two objects are placed at some distance,, they feel the force of gravity against each other., If the distance between them is doubled from the, first distance, then the force will be - 1/4 F, Ineffective wave is formed by - two waves of, the same shape, moving in opposite direction, The minimum number of forces to keep a, particle in equilibrium is – 2, , 26. SHM It should be necessary in the system, showing - both elasticity and inertia, 27. To easily open a door, its handle should be, placed- The handle should be at a greater, distance than the occupation to open the door, easily., 28. The driver of a vehicle climbing a hill keeps the, ratio of gear - equal to or more than 1, 29. A wire of resistance T is cut into equal parts,, then these parts are connected in parallel. The, equivalent resistance of the combination will be R / n2, 30. An object covers a distance that is directly, proportional to the square of time. Its, acceleration is- constant, 31. Distance of stars is measured in- Light years, 32. 1 micron is equal to- 10-6 mm, 33. Which is the highest density of water - 40 C, 34. The value of one horsepower is - 746 watts, 35. The sound of an aircraft is generally compatible, with- 100 decibels, 36. When the mercury of the barometer suddenly, falls, what does it signify- the possibility of, thunderstorm or hail, 37. The work done by the formula of a simple, pendulum during a full oscillation is equal toZero, 38. What are the units of Planck constant - Joule, second, 39. What causes a needle or pin to float on the, surface of water - surface tension, 40. What are the units of electric power- Watt, 41. Both a metal band and a rubber band of the same, code normally strike a wall with the same wave., The ball of rubber is rebound and the metal ball, is not rebound. What can be concluded from this, - Rubber balls bear more changes in, momentum., 42. If an object rotates in a circle at the same speedits velocity remains the same., 43. Why rice cooks faster in pressure cooker Water boils at a higher temperature when, there is pressure., 44. The total energy required to launch a missile at a, velocity lower than the Earth's flight velocity –, negative, 45. When water freezes- its density decreases., 46. Works on the basis of conservation of linear, force- rocket, 47. The intensity ratio of waves is 25: 9, what will, be the ratio of their expansion - 5: 3, 48. What is the most suitable unit to express the, nuclear radius- angstrom, 49. What is the amount of substance in a steel, sphere- mass

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50. Whose rule of hydraulic brake works on Pascal's rule, 51. Measuring and recording the relative humidity of, air is a – hygrometer, 52. A gas thermometer is more sensitive than a, liquid thermometer because gas -diffuses more, than liquid., 53. When the bus suddenly turns, then the, passengers standing in the bus fall outwards what is the reason for this - speed of speed, 54. If the velocity time graph of a particle is, represented by y = mt + c, then the particle is, moving- with uniform acceleration, 55. Quartz crystal work in clock is based onPressure on electric effect, 56. The reasons for TV reception are disturbed when, a vehicle passes - spark plugs cause, electromagnetic disturbance., 57. For moving bodies with unequal velocity and, uniform acceleration -the displacement time, graph is non-linear., 58. The word isoenef signifies lines with the same, ……… - cloudiness, 59. In which the following thermometer engine is, used- Rocket, 60. Who is used to measure very short time intervals, - atomic clocks, 61. The drop of oil spreads over the water because the surface tension of the oil is much less than, the water, 62. Earthquake measuring instrument is called Seismograph., 63. On which principle does the fountain pen work capillary action, 64. The instrument called picnometer is used to, measure- Density, 65. Wind speed measuring device – Anemometer, 66. The energy stored in clock springs is - potential, energy., 67. Newton's first motion - law conceives - of, inertia, 68. The oldest form of energy known to man issolar energy., 69. Energy produced commercially from coal is, called -thermal energy., 70. Gas density is high - low temperature, high, pressure, 71. A boy sitting in an open car going at a steady, speed throws the ball straight up in the air, the, ball falls - in his hand, 72. The process involved in soap making issaponification., 73. Of all the basic forces, the weakest is - the, gravitational force, 74. The strongest in nature - nuclear force, , 75. According to the theory of relativity, what, always remains the same - the velocity of light, is, 76. What is the reason for injury to a person by, hitting the stone with a rock- reaction, 77. Two stones of different mass are dropped, together from the summit of a building - both, stones reach together on the ground., 78. Which fluid has the lowest density – Petrol, 79. During the run, the runner has a center of gravity, - in front of his feet., 80. The walls of a dam are made thicker at the, bottom than at the top because the pressure, exerted by the water - on the wall increases, with the depth of the wall., 81. The intensity of the Earth's gravitational field is, maximum - on the axis, 82. Used in the wheel of a bicycle, it increases its, inertia - moment of moment, 83. Should cars have bumpers that collide - yes,, because they protect the absorption of, passengers by withstanding the impact of the, collision., 84. Time period when the pendulum is taken to the, moon- increases, 85. Atmospheric air is placed on the earth - by, gravity, 86. The wheel has ball bearings - Converting, kinetic friction to belon friction, 87. The time period of a pendulum is 2 seconds., 88. When a spherical ball made of steel is placed in a, mercury vessel, it will remain above the surface, of the mercury., 89. Holding a piece of wood under water, how much, buoyancy force will it have on it - less than the, weight of the wood, 90. A pressure gauge is placed in a belazar, what, happens when the air is slowly extracted from, the belazar - the mercury level starts to rise., 91. Which component will be the most damaging the speed of both cars decreases to zero after, the collision, 92. By which action are wet clothes dried in spin, dryers - concentration force, 93. When a person sitting on a swing stands on it,, the frequency of swing - swing increases., 94. When the surface tension of water is added to, detergent – decreases, 95. For which purpose metal gaps are left between, two rail-pipes - for linear propagation, 96. The reason for the rounding of small bubbles is surface tension, 97. Whom does the bark of velocity-constant graph, represent- Acceleration, 98. There is a hole in the copper disc. If the disc is, heated, the size of the hole - increases.

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99. How long does it take for the light to reach the, Earth from the Sun - 8 minutes 20 seconds, 100. Ball pen works on which principleGravitational force, 101. The reason for separation of cream by churning, milk is- centrifugal force, 102. How many synchronous satellites will be, required for global transmission without, interruption – 2, 103. When detergent is added to pure water, the, surface tension will be - decreases., 104. Newton's first law is also called - law of roots., 105. On what principle do liquid machines work Pascal theory, 106. Mass of 10 moles of water is- 180 g., 107. Which force is the decaying force- friction force, 108. Who is used in hydraulic press- Pascal rule, 109. When a running car stops suddenly, the, passengers lean forward - the law of speed, 110. The material for the year old Koto and Tambu is, the source of water quality- Page stress, 111. Once is equal to -105 Pa, 112. When a body is dropped from an airplane, what, increases it – acceleration, 113. We transform water energy into potential, energy by a water pump., 114. When a stone block is immersed in water, it, displaces water with the same …………- mass., 115. What is the motion of a body which keeps, repeating after a period of time- periodic motion, 116. Due to which oil rises in the lamp light capillary event, 117. When a body is immersed in a fluid, what force, acts on it - load, uptake, 118. When a stone is thrown in the calm water of a, pond, there are waves that rise on the surface of, the water in the pond-Transverse, 119. Why is the color of the sun red at sunrise and, sunset - all the other colors are scattered, except red., 120. The phenomenon of change in the direction of, light when it passes from one medium to another, is called – refraction, 121. What would the sky look like in the absence of, the earth's atmosphere – black, 122. The blue color of the sky is visible due to which, - scattering of shorter wave concentration, 123. In which light diffusion occurs - colloidal, solution, 124. Whose unit is a diopter - the capacity of the, lens, 125. On which principle does the fiber optical cable, used in communication work- total internal, reflection of light, 126. The object which absorbs all the colors and does, not reflect any is seen- black, , 127. Movement of insects towards the source of light, is called-Lucent, 128. The division of white light into components is, due to-Reflection, 129. Why the thin layer of oil appears colored on the, water surface - due to the interference, 130. On which principle do optical fibers work complete internal reflection, 131. The color of the stars depends on- temperature, 132. The sky appears blue due to this - Raleigh, Scattering, 133. Whose units are light years – distance, 134. What causes Indra-dusha - refraction and, reflection, 135. Lux is the unit of which- Illumination, 136. If a concave mirror has both the object and the, image at the center of curvature, then the image, is- the same size as the object., 137. Color of stars depends on- their temperature, 138. Total internal reflection cannot occur when light, - through water, enters the glass., 139. Hurtz are the units of measure- Recurrent of, waves, 140. What are x rays - neutral particles, 141. When flat glass clay is placed on colored letters,, which letter appears less raised- red, 142. Which phenomenon helps in deciding that light, is a transverse wave – polarization, 143. In which case, distant things appear out of focus, – myopia, 144. Which color of light is least diffused through the, prism- Red, 145. The velocity of heat radiation in a vacuum is, equal to - light, 146. Coolies-tube is used to generate - X rays, 147. Our sky is the shape of Ganges- Spiral, 148. Who invented the electron microscope - Knoll, and Ruska, 149. Which glass is used in sunglasses- Crooks glass, 150. Non-responsive waves cannot pass through –, vacuum, 151. Which part of the light in the sun heats the solar, cooker – infrared, 152. What are the techniques related to holography to record a permanent one-color or multicolor permanent stereoscopic photograph., 153. Who absorbs ultraviolet rays in the atmosphere –, ozone, 154. Which varieties of glass are resistant to pyrex, glass, 155. The reason for the sky to appear blue is scattering of light, 156. The Lambert law is related to- Illumination, 157. What is called the atmospheric layer that reflects, radio waves – ionosphere

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158. Who was the first to explain the hydrogen, spectrum - Niels Bore, 159. Who first measured the velocity of light –, Roemer, 160. Where are the mesons found in the laser beam, 161. The conclusion of mass-energy relationship isGeneral Theory of Relativity, 162. Signal of danger is usually red because red light:, deviation is lowest, 163. A simple dithering is a convex lens with a low, focus., 164. 'Myopia' can be corrected in Manav's eye - using, right concave lens, 165. What is the reason for the shimmer of stars atmospheric refraction, 166. Instrument is used for studying the reflection of, light – spectrometer, 167. On which principle do fiber optics work - full, internal reflection, 168. A remote sensing device has a built-in source infrared ray, 169. In a laser (neon laser), all atoms emit light waves, - of the same frequency, of the same, dimension, of the same art., 170. What are the complementary colors of yellow –, blue, 171. The reason why water pools appear less deep is, refraction., 172. Color appears by applying white light on soap, bubbles. The reason for this – Interpretation, 173. The instruments used to see distant objects on, the earth are earthly telescopes., 174. The sky appears blue, because the vuomandal, scatter the drain color more than other colors., 175. When a ship enters the sea from the river- it, rises a little., 176. With the appearance of blue color in the sky,, there is a phenomenon of related light –, scattering, 177. Lens is made up of - Darak (aperture), 178. It takes the same time and the same kinetic, energy to roll a round on two inclined planes of, different angles but of equal height., 179. Which types of light are used in remote, photographing- Infra-red rays, 180. How can the magnification capability of an, astronomical telescope be reduced - by, increasing the focus distance of the eye, 181. Boolbula behaves like air in water- like the, concave lens, 182. Gulag appears red in the light of the sun. What, will that rose look like in green light – black, 183. The reason for the sparkle of the diamond is the, complete reflection of light., 184. Expected waves for long distance wireless, communication- Radio waves, , 185. 'Liquid Brake' works on the principle - Pascal, law, 186. The bomb falls to mark the 'pilot' target - before, the target, 187. Parabolic mirrors are used - in car headlights, 188. Red color is used as an emergency or danger, signal because its wavelength is the longest., 189. Bats can detect obstacles because they produce sound waves, 190. The sharpness of an image on television is called, - resolution (resolution)., 191. In a simple microscope, the image is a virtual,, magnified tabular radius., 192. On which principle does the periscope work –, diffraction, 193. A lateral view mirror for driving is convex., 194. The part of the eye with the highest refractive, index is – lens, 195. Light beam which is very directional, is calledlaser, 196. Energy in reflected light - does not depend on, angle of incidence, 197. Which color of light exhibits the most deviation, when passing through a prism- Purple, 198. When a light wave is reflected from a mirror,, then there is a change in its wavelength., 199. What type of mirror is used in front lamps (head, lights) of vehicles - concave mirror, 200. What exactly is a magnifying lens - convex lens, 201. What type of image does concave lens always, make - virtual image, 202. Whom does Gujarat face for full internal, reflection of light - water from glass, 203. People with myopia are advised to use themConcave lens (concave lens), 204. To remove the headlight chandelier in motorcars, - Polyrides are used., 205. 'lumen' unit - of flame flux, 206. Who was the founder of quantum theory of, radiation – Planck, 207. How are the magnetic waves used in television, remote control – infrared, 208. In motorcycles, why convex ions are used on the, rear arrow to hold the mirror - it has a smaller, shape than the real object., 209. What causes more biological damage - gamma, rays, 210. What is the light beam going from the critical, angle of the respective pair to the mean to the, sparse medium at the maximum incidence angle, - the overall internal reflection, 211. What is the mirror used to see the back traffic in, an automobile – convex, 212. Why the snow covered with sawdust does not, melt quickly - sawdust is a bad conductor of, heat.

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213. Which instrument is used for photography of the, Sun- Spectroheliograph, 214. Which coolant is commonly used in a, refrigerator- Freon, 215. With which instrument is the temperature of a, shining object accurately determined –, Pyrometer, 216. Which metal remains in liquid state at room, temperature- mercury, 217. At boiling point of liquids - temperature is, constant, 218. When ice is formed, water entropy- decreases, 219. Who suggested quantum theory - Max Planck, 220. Which device is used to convert solar energy into, electricity - light-voltaic cell, 221. The word 'insulation' means- incoming solar, radiation., 222. The rate of cooling depends on - the difference, in temperature between the body and its, surroundings, the tendency of the radiating, surface, the area of the radiating surface, 223. The ratio of the average kinetic energy in the, molecules of an ideal gas is - the ultimate, temperature of the gas, 224. A tire of a bicycle suddenly explodes, what does, it signify - a cryptogenic process, 225. Any mass of water from 00 From 100 cm By, heating up, its volume will- increase after, decreasing, 226. What can happen with gamma rays - gene, mutation, 227. What is seen through electron microscope Structure of bacteria and viruses, 228. Woolen clothes keep the body warm, becausethey are wool Malicious., 229. Clothes keep us warm during winters because the heat of the body keeps us from going out., 230. The conductor of electricity is- graphite., 231. Clear night are colder than cloudy nights. The, reason for this is – radiation, 232. By what process does the temperature of the Sun, reach the Earth – Radiation, 233. Where does heat in the atmosphere usually come, from – radiation, 234. Metals used to make lightning conductors arecopper., 235. Superconductors are- those whose resistance, becomes almost zero at very low, temperatures., 236. Whose unit is 'Therm' - of heat, 237. Turbulence is predicted when the pressure of the, atmosphere is -reduced., 238. Where is it difficult to cook rice - at the top of, the mountain, , 239. There will be changes in the ice and water kept, in the bowl at exactly zero degree salisius - no, change will occur., 240. A plate with a circular hole in the middle is, heated. What will be the effect on the area of the, hole - will increase., 241. Lakes freeze in winter in cold countries, leaving, water below - at 40C, 242. The amount of water vapor in the air chamber is, measured - in the form of humidity, 243. Which has the highest specific heat value –, water, 244. When vapor becomes equal to atmospheric, pressure, what is the effect on the fluid - the, fluid starts boiling., 245. The temperature whose reading is the same on, both Fahrenheit and Celsius scales - -400, 246. A body absorbs heat the most when it is - black, and rough, 247. Water is used in hot water bags because - its, specific heat is high., 248. Mercury is commonly used in thermometers, because it has high conductivity., 249. Water is not suitable as a substance until, calorimetric — it has high specific heat., 250. The density of water is 1 g / cc. This is perfect at 40c, 251. Why the outside of the bottom of cooking, utensils is left black - Black surfaces are good, absorbers of heat., 252. Gas thermometers are more sensitive to the, weight of liquid thermometers, because- the, diffusion coefficient of the gas is higher., 253. What is a white and smooth surface - bad, absorber of heat and good reflectivity, 254. At what fraction of centigrade and Fahrenheit, temperature are uniform - -400, 255. What material is used in electric heater –, nichrome, 256. The device for converting transformer is- Low, voltage AC.in High voltage AC, 257. The term 'Higgs Bosan' is related to- Gad, particle, 258. If the electrical resistance is to be reduced, then, the number of resistors should be connected to –, parallel, 259. Which is not an electromagnetic wave - Cathad, ray, 260. Diamond does not conduct electricity becauseit does not have an independent electron., 261. What is the anti-particle of electron – positron, 262. Who is associated with the current carrying, conductor - electromagnetic field, 263. Nuclear detonation is induced by- uncontrolled, chain reaction

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264. What is the adverse effect of emission of X rays - Light - Electrical effect, 265. What is called a group of solar cells that are, folded together in a certain pattern - solar cell, panels, 266. What is a choke used with tubelight- effector, 267. Which transistor is most likely to be in- Audio, equipment, 268. With whom a galvanometer can be connected, and made into a voltmeter - high resistance in, series, 269. Fleming's 'left hand rule' is related to- magnetic, field on the current, 270. Sill-frequency - frequency under which light, electrical emission is not possible., 271. Super conductors are materials that giveminimum resistance to the flow of electric, current., 272. In a conductor - the valence band and, conduction band overlap each other., 273. The electrical resistance of some materials is, completely eliminated at very low temperatures., What are these materials called –, superconductors, 274. Dynamo converts it - mechanical energy into, electrical energy, 275. A fuse wire is identified due to these, characteristics- minimum resistivity and, minimum melting point, 276. When the number of the coil in a horoscope is, tripled without any change in the length of the, coil, how much is its inductance - nine times, 277. In electronics what comes under tank circuit resistance (resistance) and capacitance, 278. Tungsten is used to make the filament of an, electric bulb, because- its melting point is very, high., 279. Polymeter is used to measure - current, voltage,, resistance, 280. A nuclear reactor used for power generation is, based on- nuclear fission., 281. A kilowatt-hour is a unit of- energy., 282. In our domestic electrical circuit the fuse melts, when there is a huge surge - in the current, 283. The instrument used to change the speed of, electric fan is – Regulator, 284. Superconducting is the conductor which haszero resistance, 285. Which device is used to limit current in electrical, circuit- Fuse, 286. Water cannot be used to extinguish a fire caused, by electric current, because - it can cause, electrocution., 287. Produces dynamic electrical charge - magnetic, field, 288. The SI unit of electric charge is- Coulam, , 289. Safety fuse wire used in household electrical, appliances is made of a metal whose- melting, point is low., 290. For electromagnetic radiation, make the correct, configuration in the order of their increased, frequency - X-rays, infrared, visible,, microscopic waves., 291. Whose unit is "ferred" - of capacity, 292. What is the nature of photon particle formation light effect, 293. The level of incompatibility of an electrolyte, depends on- Tanuta, 294. Electric fuse is an alloy of- tin and lead., 295. What is a conductor wire – neutral, 296. What is the unit of electrical conductivity- mho, 297. What is the conductor when carrying current negatively charged, 298. What is the unit of sound pollution (decibel) –, decibel, 299. Sound height depends on- amplitude, 300. Which property of sound changes due to change, in temperature of air – wavelength, 301. The velocity of sound in humid air is higher than, in dry air because in humid air: - Density is, lower than in dry air., 302. A decibel unit is used for- sound intensity., 303. Bolometer is used to measure – temperature, 304. What is noise measured in – decibels, 305. On which principle does the stethoscope used by, the doctors work - the reflection of sound, 306. Doordarshan's sound signals are- frequency, modulated, 307. The owl can see even in the darkest darkness,, because- his big eyes are facing forward,, which gives him a binocular view., 308. What is the frequency of sound- Frequency, 309. The ozone layer in the deaf atmosphere helps us, to- absorb ultraviolet radiation., 310. What is the quality that is seen in light wave but, not in sound wave – polarization, 311. Microphones are devices that convert- sound, signals into stream signals., 312. By which can the wave form of a signal be, studied- Voiceimeter or Sono meter, 313. Which is responsible for the resonance of sound, waves – Reflection, 314. Which instrument is used to measure the, wavelength of X-rays - Bragg spectrometer, 315. In which sextant device is used – Navigation, 316. What is measured by the anemometer, in the, given options - Wind speed, 317. Which has minimum frequency- visible light, 318. What is the phenomenon that established the, transverse form of light – polarization, 319. Neutron is denominated in a nuclear reactor –, modulator

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320. Why does a person standing on the platform of a, railway station feel drawn towards a fast, approaching train - the difference in pressure, between them due to the fast moving air, 321. Why a cannon retreats after firing - Newton's, third law of motion, 322. During the speed of the projectile fired from the, surface of the Earth - the horizontal component, of its velocity constant, 323. When iron rusts, its weight- increases., 324. For which reason air bubbles arise in liquids viscosity and eruption, 325. If the speed of rotation of the earth increases, the, weight of the body -will decrease., 326. Reaction is heat dependent - the path through, which the maximum product is obtained., 327. Green house gases - CO2, CH4, NO and CFC, 328. How is Dahk Sada – Praswadi, 329. A white solid substance A, on heating, removes a, gas, which turns lime water to milky, the, remaining material remains yellow in hot state,, but turns white when cooled accordingly. What, is solid A- Zinc Carbonate, 330. Iron and manganese are removed from water by, which process - air mixture, 331. Excess fraction of water absorbed by steps is, extracted – transpiration, 332. What are the substances that bring down fever in, the condition of high fever- antipyretic, 333. Sulfuric acid is- anisotropic., 334. What is the function of depressurization in the, treatment of dirty water - removal of suspended, solids, 335. There are two metal ions that cause hardness in, water - calcium, magnesium., 336. Which metals contribute to the bio-magnification, problem in ecology – Mercury, 337. Elements that are not in nature but can be, produced artificially, what is- Plutonium, 338. What is the process involved in the iron ore, fermentation process – oxidation, 339. The diagonal is used to change - the alternating, current into the direct current, 340. Elements having different physical properties but, with similar chemical properties are called asAllotropes, 341. Hexavalent chromium is strongly present in the, exclusion of which - tanning houses, 342. Thermal decomposition is the method followed, for disposal - hazardous waste, 343. Fullerene is a newly discovered crystalline, carbon molecule - 60C atom., 344. Maximum moisture content of composting, mixture for vermicomposting is- 65, 345. The permitted concentrations of residual chlorine, in drinking water, in mg / L, are- 0.2, , 346. What is the chemical used to develop, photographic films – hypo, 347. Arsenic pollution - black foot disease, 348. Alcoholic fermentation is made by- yeast., 349. Non-metals found in liquid state are- bromine., 350. The heaviest element found in nature isuranium., 351. Hydrogen balloon hovers above because- the, balloon's forest is less than the forest of air, displaced by it., 352. While using cloth, we use blue because- of its, correct character combination., 353. The energy stored in the spring of the clock ispotential energy., 354. The oscillation of the cricket ball in air can be, explained - based on the buoyancy of the air, 355. When an object is taken from the earth to the, moon, the weight changes, - but the mass, remains the same., 356. Two stones of different mass are dropped, together from the summit of a building - both, stones reach the ground together., 357. Ball bearings work in the wheel - converting, kinetic energy into cylinder friction, 358. Pushing is usually made of steel because- its, elasticity is high., 359. What is the principle of life jacket - It increases, the volume of a person to keep him floating., 360. To get the benefit of a player, who runs before a, long jump - speed of speed, 361. Instead of carrying a bucket of water in one, hand, it is easier to carry two buckets in both, hands separately, because- the center of gravity, and balance center are in the legs., 362. If the copper wire is doubled, its resistance will, be- four times., 363. Single stationary pulleys are used to draw water, from the well because the velocity ratio is low., 364. If in a break, a bomb explodes in small pieces,, then the total momentum of all the pieces will, be- zero., 365. Bullets are fired from a rifle which retreats after, firing. What is the kinetic energy ratio of the rifle, against that bullet - One, 366. Holes are made by cutting between a plate of, metal and then it is heated. The size of the hole, will- increase., 367. Kilowatt hours is a unit of energy., 368. A bottle of sodalime has been caught by the neck, and rotated rapidly in the vertical circle, near, which part of the bottle will the bubbles collect near the neck, 369. A cricket ball should be hit with a case angle so, that it can reach the maximum horizontal, distance - an angle of 450 from the horizontal.

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370. When we move from the equator to the north, pole, what is the acceleration of gravity –, increases, 371. What is the technique of collecting information, about an object remotely without direct contact remote sensing, 372. Inside an artificial satellite, a person feels, weightless because the force of attraction of the, earth is- zero at that place., 373. If we want to calculate the pressure of a liquid on, the bottom of a vessel, then to determine what, quantity is not expected - the surface area of, the surface of the vessel, 374. The water of the hand pump is hot in winter,, because- the temperature inside the Earth is, higher than the temperature of the, atmosphere., 375. A stone is dropped from the roof of a house, towards the ground. When will the kinetic, energy of that stone be maximum - just before it, reaches the ground, 376. Who is used to convert a dynamo - travel, energy into electrical energy, 377. A fluid is boiled about when its vapor pressure, becomes- equal to variable pressure., 378. Rice cooks quickly in a pressure cooker because, - high pressure increases the boiling point of, water., 379. Why it takes longer to cook potatoes on, mountain mats - high atmospheric pressure, 380. In cooking utensils there is a handle of lacadi or, bakelite because- wood and bakelite are bad, conductors of heat, 381. On hearing the thunder thunder, the person, opens his mouth, of which - to equalize the, pressure of the air on the ears of both ears., 382. Two bodies of the same bulk are thrown at the, same time from the top of a mina at the same, speed. If one body is thrown down vertically, the, other body is thrown flat, then- both reach the, ground with the same kinetic energy., 383. What happens when there is a spontaneous, change - free energy loss, 384. Why is it easier for a human to swim in sea, water than in water - the density of sea water is, more than the density of river water, 385. What should a person do to reduce his gait on a, freely rotating platform - spread his hands out, ward., 386. When two cubes of ice are pressed together,, they form a cube. Does it help them to get, together - making hydrogen bond, 387. Pressure cooker cooks food quickly becausethe contents of the cooker are conductive., , 388. Relative gravity is the ratio of which of the, following - density of matter and density of, water, 389. The work done by the formula of a Saral, pendulum during a full oscillation is equivalent, to – zero, 390. A liquid boils about when its- vapor pressure is, equal to the variable pressure., 391. A pressure gauge is placed in a belazar. Slowly, remove the air from that belt, but what happens the water level starts rising, 392. Steel is more elastic than rubber because - steel, easily deforms., 393. Who has no effect on the velocity of sound –, humidity, 394. Whose character of the star is the temperature –, temperature, 395. The glow that occurs in bubbles created by, water is due to which process - due to the total, internal reflection of light, 396. What is the purpose of optical filters transmission or inclusion of light of different, colors., 397. How signals are transmitted in optical (optical), fibers - due to total internal reflection, 398. The stars shine, but the planets do not shine, because - they are closer to the earth, so they, get more light and even if there is little change, in intensity, they are not seen., 399. Lens are used to correct the vision of a person, suffering from myopia - concave lens, 400. In which light diffusion occurs - colloidal, solution, 401. What Is not the result of atmospheric refraction, of light - showing sunlight at a higher altitude, than its actual height, 402. On what principle does optical fiber work complete internal reflection, 403. For what reason does the sea mussel appear, golden – polarization, 404. Why does the electron give more magnification, than the microscope - because the wavelength, of the electron is less than the wavelength of, the visible light ., 405. Who affects the color of flowers - flowers, blooming, vegetation growing, fruit bearing, 406. What are the minimum permeable power rays alpha-rays, 407. What is the disorder that can penetrate deep into, our body- gamma-particle, 408. What are X-rays - neutral particles, 409. Velocity is the incident light wave on a flat, surface with x. How much does Vang become, after reflection- X, 410. What causes redness in the atmosphere at, sunrise and sunset - scattering of light

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411. Which color of light is least unchanged in the, prism- red, 412. What is the view in which the points in one, plane of a substance appear in the center while, the points in the second plane are seen outside, the center- Immobility, 413. What is the technique related to 'Holigraphy' recording a one-color or one-dimensional, stereoscopic photograph of multiple colors, 414. With whom is the color of light – frequency, 415. Which compound is most convenient during day, and night - red and green, 416. Why can we hear short-wave transmissions, better than long-duration transmissions - shortrange atmospheric disturbances have no, effect, 417. What is the color of emerald (emerald), generally- dark green, 418. What is the tangency of the visible spectrum 3900Å – 7600Å, 419. Lambert's rule is related to- Illumination, 420. Which lens is used to correct the defect of, blindness- Cylindrical lens, 421. Which form of friction angle and repose angle, are - equal to each other, 422. On what phenomena are optical fibers based complete internal reflection, 423. Eclipse is caused by which optical phenomenon, – diffraction, 424. For what purpose is a very bright light in the, lighthouse - to guide and warn the ships, coming from different directions in the sea., 425. A person wears glasses with a concave lens,, because of this, where is the image of distant, objects usually focused in their eyes - in front of, the retina, 426. How does the microscope used in pathology, laboratories make images - magnified, virtual,, erect, 427. Using photography at night and in fog and fog is, possible using- infrared radiation, 428. In what colors can a blind person differ - red, and green, 429. Initially the radiation in a fluorescence tube is ultraviolet., 430. It is dangerous to see solar eclipse with naked, eyes because - ultraviolet radiation coming out, of the sun burns our retina., 431. Which waves cannot be transmitted through, vacuum- sound waves, 432. If an ordinary glass tube and a glass capillary, tube are both poured into a beaker of water, in, which water will rise - only in the glass, capillary tube, 433. Long vision can be corrected by the use of - by, convex lenses, , 434. Whose thin layer is coated on the back page of, the mirror - Silver nitrate, 435. In what form does a lightly plane surface reflect, a beam of light - in the form of diffused beam, in all directions, 436. Light waves are transverse waves because- they, can be polarized., 437. The organ with the highest refractive index isthe lens., 438. A man cannot see from 10 meters away from, which disease- myopia, 439. What is the shape of the shaving- Concave, 440. E.N.T. What type of head mirror is used by, doctors – concave, 441. Which of the following is produced by, conversion of solar energy using light voltage, cells - electric energy, 442. The ultraviolet light of the Sun's radiation does, not reach the Earth's atmosphere due to its layerOzon, 443. Why are white clothes cooler than black clothes, - they reflect whatever light reaches them., 444. What are the main colors in photography - red,, blue, green, 445. Black body can absorb whose radiation- all, wavelengths, 446. Those bodies, which are good absorbers of heat,, have other properties as well - good radiative, 447. What is wavelength when black body radiation, reaches the highest state - decreases with, increasing temperature., 448. X-ray fields are located between the gammaray and ultraviolet regions., 449. Most of the electric power used in fiber type, light bulbs is- manifested as infrared rays., 450. Why red lights are used as traffic signals to stop, traffic - they are the least scattered, 451. The reason why the star appears twinkling in the, sky - refraction of light by the atmosphere, 452. When a strong beam of light passes through a, colloidal solution, the light will – disperse, 453. Which radiation has the lowest wavelength - ϒ, rays, 454. The principle behind the stability of vision is the, theory behind- Cinema, 455. Who discovered the electromagnetic form of, light – Maxwell, 456. What is the time of exhalation required to take a, photograph of a substance - the brightness of, the substance, 457. Is the color disc test function of Newton, responsible for the - stability of vision, 458. Which layer of the Earth's atmosphere contains, ozone layer – stratosphere, 459. What will be the boiling point of water in, mountainous areas - less than the sea water

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460. In which process is the transmission of heat, through the actual motion of molecules from, high temperature to low temperature –, Convection, 461. Even after sunset, due to which the air near the, surface of the earth keeps getting heat terrestrial radiation, 462. Which device (instrument) can be used to detect, radiative heat - thermoelectric mass, 463. Which law of thermodynamics says that the heat, of a high-temperature object cannot be, transferred from a low-temperature object, without the help of any external factor - 2nd, 464. Burning by steam is more painful than boiling, water. Because - steam contains latent heat., 465. If an inert and an inertial engine are working, between the limits in front of the heat,- the, efficiency of the inertial engine will be higher, than the inertial engine., 466. The first law of thermodynamics is generally, related to the matter - conservation of energy, 467. Even after sunset, what causes the air near the, surface of the earth to receive heat - terrestrial, radiation, 468. The commonly used plastic material for making, gear heels is - polystyrene., 469. Which is used in closed- oven (micro-wave), 470. What causes the continuous creation of energy, in the Sun- nuclear fusion, 471. Different colors of different stars are due to, the variation of – temperature, 472. Whom is made by - water vapor at low, temperature, 473. How does refrigeration occur in the refrigeratorby the volatile liquid, 474. By keeping the Saint open in one corner of a, room, its scent spreads to all parts of the room., What is the reason for this – diffusion, 475. How the heat of the Sun reaches the Earth - by, radiation, 476. When two cubes of ice (cubes) are pressed on, top of each other, they join to form a cube covalent attraction, 477. Why it seems that strong wind is hurling large, fires in the open- Why the surrounding hot air, rises and cold air enters and has the effect of, kindling the fire., 478. Energy emitted by the Sun is due to- nuclear, fusion., 479. Energy in ultraviolet rays is more than whatinfrared rays, 480. The parachute comes down slowly, while the, stone thrown from the same height comes faster the surface area of the parachute is more, so, the air resistance is more, , 481. Which instrument is used to measure humiditySling cyclometer, 482. If there is a sudden increase in the temperature, of a place, the immigrant humidity - decreases., 483. Water pipes are often broken in cold winter, nights in mountainous places, because - the, water inside the pipe becomes snowy and, spreads and the pipes burst., 484. Why a two thin shirt can keep us warmer than a, thick shirt in the winter - the air layer between, two shirts acts as an anti-aging medium., 485. What is called horizontal heat transfer inside the, atmosphere - Convection, 486. Cloudy nights are warmer than clean nights,, because - clouds mainly reflect the heat given, by the Earth., 487. Lakes freeze in winter in cold countries, except, water below - at 4 ° C., 488. The amount of water vapor in the atmosphere is, measured - in the form of humidity, 489. Which has the highest specific heat valueWater, 490. By whom is the high temperature required to, ignite fuel in a diesel engine - by compressing, the air in the cylinders, 491. When the vapor pressure becomes equal to the, atmospheric pressure, what is the effect on the, fluid - the fluid starts boiling, 492. The temperature whose reading is the same on, both Fahrenheit and Celsius scales - 40 ° C, 493. A body absorbs heat the most when it is - black, and rough, 494. Water is used in hot water bags because - its, specific heat is high., 495. Mercury is commonly used in thermometers, because - it has high conductivity., 496. Why water is not suitable as a calorimetric, material - it has high specific heat., 497. Why the bottom of the cooking utensil is left, black - Black surface is good absorber of heat, 498. Gas thermometers are more sensitive than liquid, thermometers because - the diffusion coefficient, of the gas is high., 499. What is a white and smooth surface - bad, absorber of heat and good reflector, 500. What material is used in electric heaternichrome