4. A radio-controlled teaching device according to claim 1, wherein said tone generation means of said teacher transmitter unit are actuated by the teacher during oral reading by said teacher of a correct answer associated with a previously presented multiple-choice or true or false question, whereby a tone signal is transmitted by said teacher transmitter unit to a plurality of said student receiver units, one of said student receiver units being provided for each student of a classroom, said tone signal being detected by all of said student receiver units and causing a "right" score to be displayed by an associated digital readout when said response switch of a student receiver unit is momentarily closed within a short time period following reception of said tone signal, and causing a "wrong" score to be displayed by an associated digital readout when said response switch is momentarily closed when said tone signal has not been transmitted and received for extemporaneously testing each member of a school classroom without requiring written student responses.
1. A radio-controlled teaching device comprising in combination: a teacher transmitter unit containing tone generation means, timing means associated with and controlling the duration of tones generated by said tone generation means, manual switching means operatively connected to said timing means for actuating said timing means and said tone generation means at selected points during oral reading of textual material or test material, counting and readout means operatively associated with said timing means for counting and displaying the number of times said tone generation means are actuated, manual reset means operatively connected to said counting and readout means for selectively resetting said readout means to zero, and a radio transmitter operatively coupled to the output of said tone generation means for transmitting tones generated by said tone generation means; and a plurality of portable student receiver units containing a battery power supply, a radio receiver tuned to the carrier frequency of said transmitter, a tone decoder operatively connected to the output of said radio receiver, a first timing means operatively connected to and actuated by the output of said tone decoder for providing a short time period during which a student is expected to respond at said selected points during oral reading of textual or test material, a response switch which is momentarily closed by the student at said selected points during oral reading of textual or test material, a second timing means operatively connected to and actuated by said response switch for providing a brief time period when said response switch is closed, a first logic gate and a second logic gate operatively connected to said first and second timing means wherein a "right" pulse is conducted by said first logic gate when said response switch is momentarily closed during said short time period of said first timing means and, wherein a "wrong" pulse is conducted by said second logic gate when said response switch is momentarily closed when said short time period of said first timing means is not occuring, a third timing means operatively connected to the outputs of said first logic gate and second logic gate and actuated by said "right" pulse or "wrong" pulse for momentarily disabling said second timing means and said first logic gate and second logic gate when said response switch is momentarily closed, a first counter operatively connected to the output of said first logic gate, whereby a said "right" pulse advances said first counter one count when said "right" pulse occurs, a second counter operatively connected to said second logic gate, whereby said "wrong" pulse advances said second counter one count when said "wrong" pulse occurs, first decoder/drivers and liquid crystal readouts operatively connected to the outputs of said first counter for displaying the current count of said first counter, and second decoder/drivers and liquid crystal readouts operatively connected to the outputs of said second counter for displaying the current count of said second counter.