Car Brain Booster Quiz (3) 
                                                                                                                                                                 
                                                                                                                                                                                                                                                                                                                                                                                                                                                               
                                                                                                                                                                 
                                                                                                                                                                Car Engine 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                                                                                                                             What in an automobile engine serves no 
                                                                                                                                                                                                                                                                                                                                                                                                                                                             purpose but without it the engine does not 
                                                                                                                                                                                                                                                                                                                                                                                                                                                             work? 
                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                                                                                                                             Noise.