||Who firstly demonstrated experimentally the existence of electromagnetic wave?
||The working of the quartz crystal in the watch is based on which effect?
||What is the unit of Radioactivity?
||What is the wavelength of visible spectrum?
||One astronomical unit is the average distance between___?
||Earth & Sun
||Number of basic S.I. units is ___.
||What is the name of the scientist who stated that matter can be converted into energy?
||The size of atomic nucleus is of the order of___?
||A temperature at which both the Fahrenheit and the centigrade scales have the same value?
||In the visible spectrum which colour has the shortest wavelength?
||What is the unit of specific resistance?
||What do we use as a moderator in nuclear reactor?
||The mirror used in motor vehicles near the driver’s seat is a__?
||Electron microscope was invented by__?
||The hydraulic brake used in automobiles is a direct application of__?
||The filament of an electric bulb is made of which metal?
||Camberts Law is related to__?
||Which waves are used in sonography?
||Which instrument is used to measure the power of electric circuit?
||Splitting of Uranium nucleus releases_____ energy.
||kilowatt hour is the unit of__?
||A simple device that is used to either break or complete the electric circuit, is called _____?
||Where the value of ‘g’ (acceleration due to gravity) is maximum?
||Good conductors have many loosely bound __?
||If the body is hollow, then its centre of gravity lies?
||outside the material
||A man with a dark skin, in comparison with a man with a white skin, experiences__?
||Less heat, Less cold
||What is the escape velocity for all objects from the earth?
||If the temperature inside a room is increased, the relative humidity will?
||If a bar magnet is cut length wise into 3 parts, what will the total number of poles be?
||Light travels in a____?
||What converts the alternating current into direct current?
||Einstein got noble prize for____?
||The nucleus of an atom consists of__?
||Neutrons and protons
||What is the measuring unit of length of light waves?
||How much is one barrel of oil approximately equal to?
||The sky appears black from the moon because of___?
||Lack of Atmosphere
||The specific resistance of a wire varies with its___?
||Which instrument is used to measure depth of ocean?
||The unidirectional property of a PN-junction is useful for its use as which thing?
||The strongest force in the nature is ____?
||Which is the only natural magnet?
||We cannot see during a fog, because of ____.
||Scattering of light
||In which medium sound travels faster?
||A fast wind can turn the blades of a windmill because it possesses__.
||Which of the following material is used for electric wire heater?
||Conversion of chemical energy into electrical energy occurs in which thing?
||The direction of a magnetic field within a magnet is___?
||From South to north
||What remains constant while throwing a ball upward?
||What type of lens is a magnifying glass?
||Why does a liquid drop tend to assume a spherical shape?
||To minimize surface tension
||What happens when soda water bottle falls freely?
||No bubbles form
||Pure water freezes at what temperature?
||Why are Metals good conductor of heat than insulator?
||they contain free electrons
||When some detergent is added to water, the surface tension___?
||The value of which quantity remains same in all system of units?
||Distance of stars are measured in___?
||Nature of sound wave is ____?
||Which is used to initiate fissions?
||The total internal reflection can occur when light pass from___.
||Denser to Rarer medium
||Who discovered Diode Bulb?
||Sir J. S. Fleming
||Radio waves of constant amplitude can be generated with___?
||What is the SI unit of luminous intensity?
||What is the name of short duration wave?
||The absorption of ink by blotting paper involves___?
||Two drops of a liquid are merged to form a single drop. In this process___?
||Energy is released
||Which is more elastic – Steel or Rubber?
||An atom bomb is based on the principle of___?
||Which instrument is used to measure the scattering of light by particles suspended in a liquid?
||The speed of light with the rise in the temperature of the medium ___?
||Most commercial nuclear power plants worldwide are cooled by __?
||Electric Motor converts____?
||Electric energy to
||Nuclear sizes are expressed in a unit named____?
||Weightlessness experienced in a spaceship is due to___?
||Absence of Gravity
||The blue colour of the clear sky is due to ____?
||Dispersion of Light
||What does airbag, used for safety of car driver, contain?
||Radian is used to measure___?
||Who had showed that the electric and magnetic waves are equal in vacuum?
||James Clerk Maxwell
||When a red glass is heated in dark room it will seem___.
||The friction force exerted by fluids is called ___.
||Which is used in designing ships and submarines?
||Which instrument is used to measure change in volume of substances?
||On which principle, transformer works?
||Potential energy of your body is minimum when you ___.
||Lie down on ground
||The velocity of sound in air___?
||Beats occur because of __?
||In summer, the mirages are seen due to the phenomenon of __?
||Total Internal Reflection
||Who gave the first experimental value of G?
||Astigmatism can be corrected by__?
||What apparatus is used to locate a submerged object?
||The image formed by convex lens in a simple microscope is__.
||Virtual & Erect
||What is the unit of magnetic flux?
||Coolis tube is used to produce___?
||Sudden fall in barometer is indication of___?
||Force of attraction between the molecules of different substances is called___?
||What is the working principle of Washing machine?
||Insects can move on the surface of water without sinking due to___.
||Surface tension of water
||The temperature of the sun is measured with ___.
||Acceleration acts always in the direction__?
||of the net force
||Which instrument is used to measure altitudes in aircrafts?