MCQS. +Light year is the unit of (distance ) ++ Number of base quantities (7) ++ Dimensions in plane angle (2) ++ Dimensions in solid angle..(3) ++ 1 radian is equal to how many degrees...(57.3) ++ 1.00000078666 in this the zeros are called...(Captive zero )...... ++Does these zeros are significant...(yes )they are significant..... ++primary unit used for time period.....(second ).. +++Time period derived from (Cesium atom outermost electron vibrations..)
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