QUESTION & ANSWER

1.      The quantum of electromagnetic radiation is called

             Photon

2.      When an object is placed between two parallel mirrors, the number of images fomed will be

                         Infinite

3.      The pitch  of a sound is determined by its

                         Wave length

4.      What do we call a substance which is repelled?

                         Diamagnetic

5.      The energy required to remove an electron from an atom is called the……….

                  

                         Ionization energy

6.      A system of two equal and opposite parallel forces is called………

                          Couple

                 

7.      Ice skating is possible because of the phenomenon of

                          Regulation

8.      Nuclear force is communicated from one nucleon to another via a particle called………

                         Momenyum

9.   Bending of light beams around the corner of an obstacle is called…………

                         Diffusion

  

10.  One coulomb charge is                                              

                        6.25x1018 electrons

11.  The space surrounding a magnet in which magnetic force is exerted is called………..

                         Magnetic field

12.  Fleming’s left-hand rule is applicable to

                        Motor

13.  Lenz’s law states that the induced current

                        Opposes the motion

14.  What is the number of neutral points for a bar magnet with its north pole pointing geographical north?

                          Two

15.  Radar System uses

                           Electromagnetic waves

16.  With rise in temperature, the speed of sound

                           Increases

17.  A quantity that has both magnitude and direction is called………..

                           A vector

18.  ……….is the ratio of viscosity forces to pressure forces in a fluid flow.

                          Reynolds number

19.  In Newton’s third law, the action and reaction forces;

                           Act on different bodise

  

20.  What is ‘Black Hole’?                                            

                          A dying star

21.  Which of the following parts of the sunlight makes the solar cooker hot?

                         Infrared

22.  Who is the inventor of X-ray tube?

                         Coolidge

23.  In a Diesel engine ignition is caused through:

                          Compression

24.  The terminal colours of the rainbow are:

                          Violet and red

25.      The mid point of lens is called………..

                          Optic centre