Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Measuring Instruments
For seeing objects at the surface of water from a submarine under water, the instrument used is
1
kaleidoscope
2
periscope
3
spectroscope
4
More than one of the above
5
None of the above