PHYSICS MULTIPLE CHOICE QUESTIONS SET 22

PHYSICS  

MULTIPLE CHOICE QUESTIONS SET 22

1. Sound travels at maximum speed in
A. iron                       
B. air                 
C. vacuum               
D. steel
Answer: Option  d
 
2. The process responsible for the enormous energy in the sun is
A. nuclear fission            
B. nuclear fusion          
C. the burning of gases        
D. none of these
Answer: Option  b
 
3. The process of nuclear fission occurs mainly in
A. the sun                   
B. the hydrogen bomb           
C. chemical reactions      
D. nuclear reactors
Answer: Option  d
 
4. The positron is called the antiparticle of the electron,because it
A. has opposite charges                       
B. has same mass
C. collides with an electron                           
D. annihilates with an electron
Answer: Option  a
 
5. A woman’s voice is shriller than a man’s voice due to
A. higher frequency             
B. higher amplitude            
C. lower frequency         
D. weak vocal chords
Answer: Option  a
 
6. For a transversely vibrating string the frequency of vibration is directly proportional to
A. the load                  
B. its linear density                   
C. its length                    
D. none of these
Answer: Option  c
 
7. Which one of the following device converts electrical energy into mechanical energy
A. transformer                         
B. inductor                     
C. dynamo                  
D. electric motor
Answer: Option  d
 
8. Substances which lose their electrical resistances at very low temperature are called
A. semi conductors                     
B. super conductors             
C. good conductors        
D. dielectrics
Answer: Option  b
 
9. When two resistors,each of value 10 ohms,are connected in parallel,what is the effective value 
of the combination?
A. 6 ohms                     
B. 7 ohms                    
C. 4 ohms                     
D. 5 ohms
Answer: Option  d
 
10. The unit for quantity substance is
A. mole                    
B. kilogram                   
C. gram                   
D. metre^3
Answer: Option  b