1. A cathoderay oscilloscope may be used as a voltmeter (DC) in the range __ to __ V with sensitivity __ (mm/V) and for A.C in the range __ V(RMS) to __ V with sensitivity (mm/V)

cathode-ray oscilloscope (CRO) is an electronic test instrument commonly used to display and analyze the waveform of electronic signals. It can be used as a voltmeter and an oscilloscope.<br /><br />For the voltmeter function, the range and sensitivity depend on the specific CRO model. However, a typical CRO may be used as a voltmeter in the range of 0 to 10 V with a sensitivity of 0.1 mm/V for DC measurements.<br /><br />For AC measurements, the range and sensitivity also depend on the specific CRO model. A typical CRO may be used for AC measurements in the range of 0 to 100 V RMS with a sensitivity of 0.1 mm/V.<br /><br />Therefore, the correct answer is:<br /><br />A cathode-ray oscilloscope may be used as a voltmeter in the range of 0 to 10 V with a sensitivity of 0.1 mm/V for DC measurements and in the range of 0 to 100 V RMS with a sensitivity of 0.1 mm/V for AC measurements.