Friday, 11 October 2013

QUESTION & ANSWER

1.      Which one of the following is a non conventional source of energy?

                         All of the above

2.      Nuclear fusion reactions reactions require very high temperature so as to overcome

                        Coulomb forcer

3.      Permanent magnets can be made from

                         Cobalt
  
4.      What type of image is formed on a film in a camera?

                        A real image

5.      Who propounded the quantum theory?

                        Max Planck
                                                                                                       
6.      An object weighs maximum in

                          Air

7.      Electric bulbs are filled with………gas.

                         Argon

8.      Photographs of very distant objects are possible by……..

                         Infrared rays

9.      What is the source of electric energy in an artificial satellite?

                        Solar cells

10.  Transmission of heat takes place very quickly by

                      Radiation

11.  The hydraulic brakes used in automobiles are a direct application of…………

                      Pascals law

12.  The luster of diamond is due to………

                      Total internal reflection

13.  Ultraviolet rays are absorbed by………

                      Glass

14.  Which one of the following is the most effective carrier of information?
  
                     Optical fibres.

15.  The spring balance works on the principle of…..

                     Hooke’s law
  
16.  The process of adding certain impunities in the crystal structure of a semi conductor so as to improve its conductivity is called-------
  
                      Doping

17.  We can not hear sounds less than……….frequency.

                       Hz

18.  Which of the following metals has higher conductivity of heat?

                        Copper

19.  The most harmful radiations for man are:

                         Gamma-rays

20.  The present telegraph code was introduced by:

                          Morse

21.  Light consists of tiny packets of energy called---

                          Photons

22.  The light energy of the sun comes from:

                         Fusion reaction

23.  In a nuclear reactor, one of the following is used as fuel:

                         Uranium

24.  Which type of mirror is used by dentists to concentrate light on the tooth to be examined?

                          Concave

25.  The particle which is supposed to travel faster than light is:


                          Tachyon