What is a motion sensor?

English as a Second Language English Teacher Explanations (ESL Tests)
1

English Grammar Tests, Elementary Level

ESL/EFL Test #290 [color=blue]“Electronic Devices (1)”, question 1

A …-sensor is a security device that turns on an outdoor light if someone walks near the device.

(a) speaker
(b) motion
(c) move
(d) jog

English Grammar Tests, Elementary Level

ESL/EFL Test #290 [color=blue]“Electronic Devices (1)”, answer 1

A motion-sensor is a security device that turns on an outdoor light if someone walks near the device.

Correct answer: (b) motion
[size=200]_________________________[/size]

is move-sensor right?

2

No, this is a specific technical term. You may hear some people speaking about a ‘movement sensor’, but the correct term is ‘motion sensor’.