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                                 K.S ACADEMY, SALEM-PG TRB QUESTION PAPER 
           
                                                                                                        
                                    PG TRB  , POLYTECHNIC TRB & TNSET  
                                       COACHING CENTRE FOR PHYSICS 
                 MODEL EXAMINATION FOR DIRECT RECRUITMENT OF POST GRADUATE 
                                          ASSITENT IN GOVERNMENT SCHOOLS-2017 
                                                                  th 
                                                               8  FULL TEST  
          TIME:  HOURS                                                                                                        Marks: 150 
          ***************************************************************************** 
          General Instruction to Candidates : 
                  At the commencement of examination, the question booklet will be given to you. In the 
                   first 5 minutes, you are requested to open the booklet and compulsorily examine it as 
                   below : 
                  To have access to the Question Booklet, tear off the paper seal on the edge of this cover 
                   page.  
                  Rough Work is to be done in the end of this booklet. 
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                  Answers are to be marked on the OMR answer sheet 
                  Use only Black Ball point pen to shade the answer. 
                  Hand over the OMR answer sheet at the end of the examination to the Invigilator. 
                  This book contains 22 pages 
          Answer all the question: 
          1.A small body of mass “m” is suspended from a retort stand with light inextensible string and 
          is made to oscillate.  The Lagrangian of the system is 
                                                                                                 
          a) m                                                                       b)                        
                                                                                                
                                                                                                 
          c)                                                                       d)           
                                                                                        
           
           
          K.S ACADEMY, SALEM PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS 
          CELL:9042976707                                                                                                                Page 1 
           
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                              K.S ACADEMY, SALEM-PG TRB QUESTION PAPER 
          
         2. The motion of an unconstrained rigid body can be described by 
         a) six coordinates                                              b) three Cartesian coordinates             
         c) three Euler angles                                           d) three Cartesian and three Euler angles  
          
         3. One of the Hamiltonian`s equations of motion is 
         a)                                                              b)                           
                                                                               
                                                                                         
         c)                                                              d)         
                                                                                       
                                                                                      
          
         4. The Lagrangian L of a particle of mass “m” for which its momentum is conserved is 
         a)                                                                b)                        
                                                                                     
                                                                                               
         c)                                                                    d)                 
          
                                                                          
         5. The Hamiltonian is for Lagrangian L =                            
                                                                        
                                                                                          
         a)                                                              b)                             
                                                                             
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         c)                                                                d)               
          
         6. SI unit of Poynting vector are 
                                                                                        
         a) Joule/                                                        b) Watt/                  
                                                                                        
         c) Joule/                                                          d) Watt/   
          
         7. Ampere`s law in integral form is 
                                                                                       
         a)                                                              b)                              
                                                                                            
                                                                                           
                                                                                       
         c)                                                              d)                  
                                                                             
                                                                                            
          
         8. The maximum efficiency of reflex klystron is 
         a) 58%                          b) 10%                            c) 22.7%                        d) 64% 
         K.S ACADEMY, SALEM PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS 
         CELL:9042976707                                                                                                  Page 2 
          
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                                K.S ACADEMY, SALEM-PG TRB QUESTION PAPER 
          
         9. The velocity of plane electromagnetic wave in free space is 3 x     m/s, the wave velocity in 
         lossess medium with       and       is 
                                                         
                                                                                              
         a) 3 x                                                                  b)                                        
                                                                                      
                                                                                               
         c)                                                                     d)               10.  
                                                                                      
          
         10. In a travelling electromagnetic wave E and H fields with respect to time are 
         a) of phase difference 90                                               b) of phase difference 45                    
         c) of phase difference 135                                             d) in phase 
          
         11. The Lorentz force law is expressed as 
                                                                                                     
         a)                                                                      b)                              
                                                                                                               
         c)                                                                       d)                   
          
         12. The magnetic field accompanying a beam of light can be accurately described as 
         a) parallel to the direction of its motion                            
         b) parallel to the electric field but out of phase by 90                             
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         c) perpendicular to both electric field and direction of travel               
         d) perpendicular to the electric field but out of phase by 90  
          
         13. Inertial system of reference is one in which 
         a) Newton`s 1st law holds                   
         b) forces due to acceleration of distant stars relative to the system are present                  
         c) uniform rotation is present                                 
         d) Euclidean geometry does not hold 
          
         14. A one metre rigid rod is at rest along    axis in an internal system    which is moving with 
         constant velocity 0.8C relative to another inertial system S also the common positive X-   axis.  
         For an observer in S, the length of the rod is 
         a)                                                                     b)                             
                                                                                     
                  
         c) 0.36 metre                                                           d)           
                                                                                         
         K.S ACADEMY, SALEM PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS 
         CELL:9042976707                                                                                                             Page 3 
          
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                                      K.S ACADEMY, SALEM-PG TRB QUESTION PAPER 
            
            
           15. In relativistic mechanics, kinetic energy is given by 
           a)                                                                                       b)                                                    
                                                                                                                                      
                                                                                                                              
                                                                                                                            
                                                                                                                      
                                                                                                                           
                                                                                                                            
                                                                                                               
                                                                                                              
           c)                                                                                        d)            
                                                
                                                                                                                  
                                                                                                                
                                                                                                           
                                                                                                                
                                                                                                                
            
           16. The de Broglie wavelength associated with an electron of mass m and accelerated by a 
           potential V is 
           a)                                    b)                              c)                                                d)        
                                                                                                                                           
            
           17. The rest mass of a photon is 
                                                                                                                                                             
           a) 1.67 x                                       b) zero              c) 1.67 x                                         d) 1.67 x                        
            
           18. Michaelson-Morley experiment was conducted to 
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           a) measure velocity of light                                                       b) test the validity of either hypothesis              
           c) verify Doppler`s effect                                                          d) verify photo-electric effect 
            
           19. Covariant form of Maxwell`s equations implies 
           a) that they are written in 4 vector notation                       
           b) that the four equations are reduced into 2 
           c) writing the equations in terms of electric and magnetic potentials                 
           d) that the form of equations is unchanged when one goes from one reference system to another  
            
           20. The mean energy of quantum oscillator is 
           a) equal to KT                                                                     b) always greater than KT                 
           c) always less than KT                                                             d) equal to zero 
            
            
           K.S ACADEMY, SALEM PG TRB, POLYTECHNIC TRB & TNSET COACHING CENTRE FOR PHYSICS 
           CELL:9042976707                                                                                                                                 Page 4 
            
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