Aperture is controlled by 'diaphragm' in optics.
        
                    
             
        
        
        
Percussion instruments are musical instruments that make a sound when they are struck, shaken, scraped, plucked or rubbed.
example: drums, cymbals, xylophone
        
                    
             
        
        
        
Aniconism is the avoidance of figural imagery.   Correct answer: C
Aniconism is the idea of avoiding or banning the visualization of divine or human beings. This art includes creating objects that are intended to be false gods is a sin and that even images that are not intended by the artist to be worshipped. It is included in the Islamic art. 
 
        
                    
             
        
        
        
The principal used the remote to change the slide on the presentation