Mukul is a student of class VI. Once he was suffering from cold and cough. His mother took him to a doctor. The doctor examined him with the help of a 'stethoscope'. On returning home, he asked his elder brother Shubham about the Stethoscope, who got him aware about it ? (a) 4lhat is Stethoscope ? State its application. (b) Name any other device which works on the same principle as being utilised in a Stethoscope. (.) what qualities are shown by Mukul and his brother shubham