other govt exam BARC DAE Junior Purchase Assistant / Junior Storekeeper Mock Test General Science Physics Measuring Instruments
The size of the Respirable Suspended Particulate Matter (R.S.P.M) in air:
1
more than 7 μm (microne)
2
more than 6 μm (microne)
3
more than 5 μm (microne)
4
less than 5 μm (microne)