Question

Tick (✓) the most appropriate answer :
1. An electric bell is suspended in a bell jar and
then air is removed from it. On switching on
the electric bell, the sound heard is:
(a) very loud (b) normal sound
(c) weak sound (d) no sound is heard
2. The convenient instrument used in laboratory
to produce pure sound is :
(a) whistle
(b) drum
(c) tuning fork
(d) guitar
d later​

Answer 1

Answer:

When electric bill is suspended in a bell jar and the air is removed from it then there will be no air and there will be the presence of vaccum

Answer 2

Answer:

d) no sound is heard

c) tuning fork