GK Questions: General Science(Physics) – Set 14

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1. A boat will submerge when it displaces water equal to its own ………………
   1.weight
   2.volume
   3.force
   4.momentum
   5.None of these
   
   Answer & Explanation

   Answer – 1.weight
   Explanation :
   A boat will float when the weight of water it displaces equal the weight of the boat and anything will float if it is shaped to displace its own weight
   
   
   
2. In an astronomical telescope the objective lens is ………….
   1.Bifocal lens
   2.Convex lens
   3.Polycarbonate lens
   4.Concave lenns
   5.None of these
   
   Answer & Explanation

   Answer – 2.Convex lens
   Explanation :
   Astronomical telescope consists of two convex lenses
   
   
   
3. Charge is a ………………..
   1.Vecor quantity
   2.Either Scalar or Vector
   3.Scalar quantity
   4.Dimensionless
   5.None of these
   
   Answer & Explanation

   Answer –3.Scalar quantity
   Explanation :
   Electric charge is a scalar quantity because it does not obey the law of vector addition.
   
   
   
4. ……………. Is a paramagnetic substance
   1.Zinc
   2.Water
   3.Iron
   4.Aluminium
   5.None of these
   
   Answer & Explanation

   Answer – 4.Aluminium
   Explanation :
   Paramagnetism is a form of magnetism whereby certain materials are attracted by an externally applied magnetic field, and form internal, induced magnetic field
   Ex – Aluminium
   
   
   
5. Chloride is a ………………….. substance
   1.Diamagnetic
   2.Ferromagnetic
   3.Paramagnetic
   4.All of these
   5.None of these
   
   Answer & Explanation

   Answer – 2.Ferromagnetic
   Explanation :
   Permanent magnets (materials that can be magnetized by an external magnetic field and remain magnetized after the external field is removed) are either ferromagnetic or ferrimagnetic, as are othe rmaterials that are noticeably attracted to them.Ex – Chloride, iron
   
   
   
6. The Curie temperature of Iron is ………..
   1.627K
   2.1000K
   3.1043K
   4.1400k
   5.None of these
   
   Answer & Explanation

   Answer – 3.1000K
   Explanation :
   The Curie temperature of Iron is 1000K
   Cobalt – 1400K
   Nickel – 627K
   
   
   
7. When the energy of satellite is ………………….. it escapes away from its orbit and its path become parabolic
   1.Zero
   2.Maximum
   3.Minimum
   4.Positive/Negative
   5.None of these
   
   Answer & Explanation

   Answer – 1.Zero
   Explanation :
   When the energy of satellite is Zero it escapes away from its orbit and its path become parabolic
   
   
   
8. Electrostatic precipitator is used to …………………
   1.Control the ionisation
   2.Control the speed
   3.Control the flow of current
   4.Remove the pollutants
   5.None of these
   
   Answer & Explanation

   Answer – 4.Air pollutants
   Explanation :
   An electrostatic precipitator (ESP) is a filtration device that removes fine particles, like dust and smoke, from a flowing gas using the force of an induced electrostatic charge minimally impeding the flow of gases through the unit.
   
   
   
9. Water is a ………………….of electricity
   1.Semi conductor
   2.Super conductor
   3.Bad conductor
   4.Good conductor
   5.None of these
   
   Answer & Explanation

   Answer – 3.Bad conductor
   Explanation :
   Pure water is always a bad conductor of electricity. this is because the electrons in the water molecules are not in the conduction band in the room temperature and at higher
   
   
   
10. The Frequency of alternating voltage supplied is ……………..
    1.30Hz
    2.50Hz
    3.20Hz
    4.80Hz
    5.None of these
    
    Answer & Explanation

    Answer – 2.50Hz
    Explanation :
    Almost the whole of the world uses a frequency of 50Hz and a voltage of 220-240(higher voltages for better efficiency in transmission). The exception, where 60Hz is used (with a voltage of 110-120), is the Americas (North and South) and the Caribbean (and parts of Japan and Korea).