100+ General science GK for competitive exam of Railway Group-D,

100+ General science GK, for the competitive exam of Railway Group-D, Group-C, ASM, TC, TTE, NTPC, Bank PO, Clerk, SSC, BSF, CISF, etc.

GK Science

  • Ancient instruments used by men to measure time- Sundial, Water clock, hourglasses.
  • The time period of a Pendulum depends on -The length of the string.
  • An Odometer shows – Trip distance.
  • A speedometer shows-Speed of vehicles.
  • An instrument is used to measure Humidity –Hydrometer.
  • SONAR is based on the principle of –Eco.
  • Ohm’s law does not apply on - Semiconductor.
  • For measuring very high temperature, we use-Thermoelectric Pyrometer.
  • Bat can fly in dark night because – They produce the ultrasonic wave.
  • Change of solid into vapor directly is called-Sublimation.
  • The audible frequency range of a human ear is- 20Hz to 20KHZ or 20Hz to 20000Hz.
  • The wavelength of X-ray is of the order of -1 angstrom.
  • Wireless communication is discovered by – Marconi.
  • The planet nearest to the earth is- Venus.
  • The solar eclipse occurs when-moon comes between the sun and the earth.
  • Primary colors used in a color TV are-Blue, Green, Violet.
  • Cooking is quicker in a pressure cooker because- Increased pressure raises the boiling point.
  • According to Keller, the path of planets revolving around the sun is --- Elliptical.
  • The best conductor of electricity is- Saltwater.
  • The coolant used in Nuclear Reactors is-Heavy water.
  • Lightyear is the unit of –Distance.
  • Lightest gas –Hydrogen.
  • Red Planet-Mars.
  • The core of a Transformer is made up of –Soft Iron.
  • For Pasteurization of Milk by Flash method, milk is heated to a temperature of -72 ℃.
  • The chief source of energy –Sun.
  • In a battery cell, energy is stored in the form of -- Chemical energy.
  •  For shaving type of mirror used—Concave mirror.
  • The Eco is produced by the sound waves due to—Reflection of sound.
  • The weight of the object of mass 1 kg is equal to –9.8N.
  • A body executing free falling motion have –Equal acceleration.
  • A semi conductor has –Negative temperature coefficient.
  • A mobile charger is—Step - down transformer.
  •  The Bernoulli’s theorem is---- Energy conservation.
  • Good absorbers are good emitters, explain by ---- Kirchhoff’s law.
  • Good conductors have many loosely bound ---- Electron.
  • Solar radiation is measured by ---Pyrometer.
  • Relative humidity is measured by--- Hygrometer.
  • Inventor of Scooter—Wim  Ouboter.
  • Hydrogen bomb is developed by--- Edward Teller.
  • The missile is developed by --- Wernher Von Braun.
  • Atom is developed by – J. Robert Oppenheimer.
  • X-ray is invented by --- Roentgen.
  • Inventor of cosmic ray --- Vector Hess.
  • SI unit of Mechanical power--- Watt.
  • In a nuclear reactor, heavy water (D₂O) is used in the form of --- Moderator.
  • Curie is the unit of --- Radioactivity.
  • If a bar magnet is cut into two equal halves, then pole strength of each piece---Remain the same.
  • A nuclear reactor is an example of--- Controlled fission.
  • The hydrogen bomb is based on the principle of --- Nuclear fission.
  • Any motion which repeats itself after regular intervals of time is called—Periodic motion.
  • Distance traveled by an object in unit time called --- Speed.
  • Distance =Speed x Time.
  •  Distance –Time graph of a body in uniform motion is a--- Curved line.
  •  The potential difference is measured by ---Voltmeter.
  • Materials which allow electric current to pass through them are called--- Conductors.
  • Materials which do not allow electric current to pass through them are called--- Insulators.
  • The closed path in which the electric current flows is called --- Electric Circuit.
  • An electric circuit can be protected by a device called --- Miniature Circuit Breaker(MCB)/Fuse.
  • The device which prevents the flow of excess electron in a circuit ---Fuse.
  • The thin wire seen inside the bulb is ---Filament.
  • Electric current flows from --- High potential to Low potential.
  • 1 Astronomical Unit (A. U) = 1.495 X 10⁹ meter. ( Distance between sun and earth )
  • 1 Light Year=9.46 x 10¹⁵ meters ( Distance traveled by light in vacuum in 1 year )
  • 1 ParSec = 3.08 x 10¹⁶ meters.
  • The Time taken by a body to fall from a certain height and to raise the same height is always--- Same.
  • When a body is thrown vertically upward, its value of acceleration due to gravity is taken as---Negative (Bcz its velocity decreases during upward throwing ).
  • When a body is falling vertically downward, its value of acceleration due to gravity is taken as---Positive. (Bcz its velocity increases during downward falling ).
  • When a body falls from a certain height freely its initial velocity is---Zero.
  • When a body or object is thrown vertically its final velocity will be---Zero.
  • In earth surface value of acceleration due to gravity (g) ---9.8 m/s²
  • The power of a Machine is expressed in ---HP.
  • 1 H.P. =746 watt.
  • The minimum velocity through which a body is projected from earth surface so that it goes out of the gravitational field of earth and never returned to earth is called --- Escape Velocity.
  • The SI unit of pressure is --- Pascal (Pa).
  • 1 Pa=1 N/m²
  • A thin needle can float on the surface of water due to ---Surface Tension.
  •  The speed of Sound in Air at 0℃ –332 m/ s.
  • The speed of Sound in Vapour at 0℃ – 405 m/s.
  • The speed of Sound in CO₂ at 0℃–260 m/s.
  • The speed of Sound in Water at 0℃ ---1493 m/s.
  • The speed of Sound in Glass at 0℃ –5640 m/s.
  • The speed of Sound in Iron at 0℃ –-5130 m/s.
  • The speed of Sound in Mercury at 0℃  ---1450 m/s
  • The speed of Sound in Seawater at 0℃ –1533 m/s
  • The speed of Sound in Alcohol at 0℃ ---1213  m/s
  • The body through which heat is not transmitted by any condition is called---Thermal Insulator.
  • The typewriter is invented by ---Sholes.
  • The stethoscope is invented by --- Laennec.
  • The motor car is invented by ---Austin.
  • The Study of Earth and rocks is called ---Geology.
  • The Planet which has both air and water--- Earth.
  • The natural satellite of the earth is --- Moon.
  • The brightest planet is --- Venus.
  • The object through which light cannot pass is called—Opaque object.
  • The objects through which light can pass partially are call---Translucent object.
  • The objects through which most of the light can pass are call--- Transparent object.
  • The solar eclipse occurs only on---New moon day.
  • The solar eclipse occurs when the moon is in between ---The sun and the earth.
  • The lunar eclipse occurs only on ---Full moon day.
  • The lunar eclipse occurs when the earth is in between---Sun and moon.
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