PHYSICS MULTIPLE CHOICE QUESTIONS SET 18

PHYSICS 

MULTIPLE CHOICE QUESTIONS SET 18

1. The angle of incidence for which the angle of refraction is 90° is called as
A. right angle                 
B. critical angle              
C. straight angle           
D. obtuse angle
Answer: Option  b
 
2. Land and sea breeze are due to
A. conduction of heat          
B. convection of heat          
C. radiation of heat   
D. conversion of heat
Answer: Option  d
 
3. A rainbow is caused by
A. diffraction            
B. dispersion           
C. total internal reflection          
D. interference
Answer: Option  c
 
4. A falling drop of rain water acquires the spherical shape due to
A. viscosity                  
B. surface tension            
C. atmospheric pressure        
D. gravitational force
Answer: Option  b
 
5. The coefficient of reflectivity of a perfect black body is
A. infinite                  
B. zero                   
C. one                      
D. between zero and one
Answer: Option  d
 
6. The period of oscillation of a simple pendulum
A. is independent of length                            
B. increases with length
C. decreases with length                               
D. increases with amplitude
Answer: Option  c
 
7. Earthquake is measured using
A. Barometer              
B. Laser rays                    
C. Altimeter                   
D. Seismograph
Answer: Option  d
 
8. X–rays carry
A. no charge            
B. two positive charges          
C. unit positive charge     
D. unit negative charge
Answer: Option  d
 
9.  One of the following is used for satellite communication?
A. light waves           
B. microwaves                  
C. radio waves                
D. all of these
Answer: Option  b
 
10. The term “Mach” is used to measure speed of
A. sound                   
B. wind               
C. ship                     
D. aeroplane
Answer: Option  d