GK Questions: General Science(Physics) – Set 18

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1. One Astronomical unit is the average distance between ………………….. and …………………..
   1.Earth , Sun
   2.Sun, Mars
   3.Moon, Sun
   4.Earth, Moon
   5.None of these
   
   Answer & Explanation

   Answer – 1.Earth , Sun
   Explanation :
   One Astronomical unit is the average distance between the Earth and the Sun
   
   
   
2. ……………… is used for making an electromagnet
   1.Copper
   2.Iron
   3.Aluminium
   4.Nickel
   5.None of these
   
   Answer & Explanation

   Answer – 2.Iron
   Explanation :
   The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing
   
   
   
3. ……………… is a unit of Astronomical Distance
   1.Para/Sec
   2.Sec
   3.Parasec
   4.Metersec
   5.None of these
   
   Answer & Explanation

   Answer – 3.Parasec
   Explanation :
   A parsec is a unit of length used to measure large distances to objects outside the Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arc second
   
   
   
4. A body will not radiate any heat energy at …………….
   1.0^oC
   2.100^oC
   3.300^oC
   4.-273^oC
   5.None of these
   
   Answer & Explanation

   Answer – 4.-273 ^oC
   Explanation :
   At 0 deg Celsius radiation would continue. It would totally stop only when it is at -273 deg Celsius or 0 kelvin. ie absolute zero.
   
   
   
5. The speed of light is maximum for which colour ?
   1.Red
   2.Green
   3.Blue
   4.Yellow
   5.None of these
   
   Answer & Explanation

   Answer – 5.None of these
   Explanation :
   The speed of light is same for all the colours.
   
   
   
6. The conversion of heat energy into electrical energy is achieved by
   1.Diodes
   2.Thermocouple
   3.Coils
   4.Resistors
   5.None of these
   
   Answer & Explanation

   Answer – 2.Thermocouple
   Explanation :
   The conversion of heat energy into electrical energy is achieved by Thermocouple
   
   
   
7. Recording a permanent three dimensional photograph of a single or multi colour is known as
   1.Stylography
   2.Iconography
   3.Holography
   4.Stereoscopy
   5.None of these
   
   Answer & Explanation

   Answer – 3.Holography
   Explanation :
   Holography is the science and practice of making holograms. Recording a permanent three dimensional photograph of a single or multi colour.
   
   
   
8. Persistance of vision is the principle behind which among the following ?
   1.Cinema
   2.Telescope
   3.Periscope
   4.Microscope
   5.None of these
   
   Answer & Explanation

   Answer – 1.Cinema
   Explanation :
   Persistence of vision refers to the optical illusion whereby multiple discrete images blend into a single image in the human mind and believed to be the explanation for motion perception in cinema and animated films. Like other illusions of visual perception, it is produced by certain characteristics of the visual system.
   
   
   
9. ……………… is used for accurately measuring very small intervals
   1.Analog Clock
   2.Quatrz Clock
   3.Digital Clock
   4.Atomic Clocks
   5.None of these
   
   Answer & Explanation

   Answer – 4.Atomic Clocks
   Explanation :
   To measure very small time intervals, atomic clocks may be used
   
   
   
10. Cryogenic engine find application in…………
    1.Submarines
    2.Super Conductivity
    3.Rocket Technology
    4.Nuclear Energy
    5.None of these
    
    Answer & Explanation

    Answer – 3.Rocket Technology
    Explanation :
    ISRO successfully used an indigenous cryogenic engine in a  rocket technology