railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Measuring Instruments

ଶବ୍ଦ ପୁନଃଉତ୍ପାଦନ ପାଇଁ ବ୍ୟବହୃତ ହେଉଥିବା ଯନ୍ତ୍ରକୁ ________ କୁହାଯାଏ ।

1
ରେଫ୍ରାକ୍ଟୋମିଟର 
2
ଫୋନୋଗ୍ରାଫ୍
3
କ୍ରେସ୍କୋଗ୍ରାଫ୍ 
4
ଇଉଡିଓମିଟର 
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