1. According to special theory of relativity, all laws of physics are valid in:

A. Inertial frames of reference
     
B. Non-inertial frames of reference
     
C. Accelerated frames of reference
     
D. General frames of reference
 

2. The velocity at which the relativistic length of body reduces to half its original length is.

A. 1/4c
B. √3/2
C. 1/2c
D. √2/3c

3. If speed of a body is v  C/2 then its relativistic mass m is:

A. √3m_e/2                                               
B. √3m_e    
C. 2m_e/√3                                                 
D. 2m_e
 

4. In non-inertial frame, which statement is correct?

A. Acceleration  0	                                  
B. External forces are present
     
C. Laws of physics are not valid                    
D. All of these
 

5. The mass of the particle moving with velocity greater than velocity of light is:

A. Zero                                                                  
B. Unity
    
C. Infinite                                                              
D. Not possible

6. When a body is heated, it first appears?:

A. Violet                                                                  
B. Red   
C. Green                                                                   
D. Blue
 

7. As a body is heated and its temperature is increased, the radiation becomes richer in:

A. Shorter frequencies                               
B. Shorter wavelengths
    
C. Longer wavelengths                               
D. Very long wavelengths
 

8. Which of the following light has highest momentum?

A. Blue                                                            
B. Violet
    
C. Yellow                                                         
D. Red
 

9. If energy of a photon A is twice the energy of photon B, then ratio of their momenta p_A/p_B=

A. 2                                                        
B. 1/2  
C. 4                                                                        
D. 1/4
 

10. Which of the following properties, the photon does not possess:

A. Rest mass                                                     
B. Energy 
C. Momentum                                                   
D. Frequency