PHYSICS MULTIPLE CHOICE QUESTIONS SET 17

PHYSICS 

MULTIPLE CHOICE QUESTIONS SET 17

1. Which one of the following layers of the atmosphere is responsible for the reflection of radio waves?
A. Stratosphere                 
B. Mesosphere                  
C. Ionosphere             
D. Troposhere
Answer: Option  c
 
2. The substance used for the softening of hard water is
A. copper sulphate                 
B. sodium carbonate         
C. sodium hydroxide     
D. sodium chloride
Answer: Option  b
 
3. The energy gap of diamond is
A. 1 ev                    
B. 2 ev                        
C. 7 ev                             
D. 10 ev
Answer: Option  c
 
4. When water freezes into ice the density
A. increases                          
B. decreases                
C. remains constant                
D. disappears
Answer: Option  b
 
5. Joule is the unit of
A. temperature                  
B. pressure                    
C. energy                      
D. electric potential
Answer: Option  c
 
6. Einstein was awarded Nobel prize for
A. theory of relativity            
B. gravitational effect          
C. photo electric effect     
D. quantum effect
Answer: Option  c
 
7. The smallest planet in the solar system is
A. mars                   
B. mercury                         
C. earth                    
D. pluto
Answer: Option  d
 
8. The first satellite launched by india is
A. bhaskara                
B. varuna                     
C. aryabhatta                  
D. agni
Answer: Option  c
 
9. Crystal dynamics was invented by
A. Volta                     
B. Napier                 
C. C.V.Raman                    
D. Graham bell
Answer: Option  c
 
10. When the pressure increases the boiling point rises. The device which uses this principle is
A. electric iron              
B. electric heater               
C. pressure cooker         
D. manometer
Answer: Option  c