Choose or find odd number - 15 , 21 , 24 , 28 , 30

D. 28

Choose or find odd word - Physics , Chemistry , Geography , Botany , Zoology

C. GEOGRAPHY

Choose or find odd word - Stereo , Transistor , Television , Radio , Loundspeaker

C. TELEVISION

Choose or find odd number - 12, 25, 37, 49, 57

C. 37

Choose or find odd letter group - BDH , IKP , QSW , TVZ , PRV

B. IKP