activity of text interpretation, aimed at students in the fifth year of elementary school, about the presence sensor. He has the function of perceiving, that is, detecting a certain type of energy and its variation in the environment. Let's understand how this equipment works? So, read the text carefully! Then answer the various interpretative questions proposed!
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SCHOOL: DATE:
PROF: CLASS:
NAME:
Read:
You approach the entrance of a building and, suddenly, the door opens by itself. It takes courage to face a dark corridor and, when you take the first step, the lights come on. Behind situations like this is the presence sensor, a device that uses detection technology!
The presence sensor has the function of perceiving, that is, detecting a certain type of energy and its variation in the environment. The most used equipment works by detecting infrared radiation. We can notice its action in many places: in malls, in banks, in some buildings and stores.
Infrared radiation – which are electromagnetic waves – is emitted by heat sources. That includes bonfires, as you might have thought, but also me, you, the neighbor's dog... When a person enters an environment monitored by such a sensor, its presence is detected by causing a variation of this energy in the place.
When we approach a door or a place where there is a lamp connected to sensors, the heat emitted by our body is interpreted by the sensor as an electrical signal. He is the one who activates the lamp and keeps it lit as long as there are people moving or occupying the environment. The sensor can also trigger an alarm or cause a door to open, depending on the device it is attached to.
The infrared presence sensor still has a lens that divides the environment into regions. This means that, in addition to detecting the infrared radiation emitted by heat sources, it also monitors variations in this energy in many parts of the same location. Now, if people are not very close to the sensor, they will probably not be detected, as the sensitivity of the device decreases with distance.
Fabio Luis Alves Pena. Magazine “Science Today for Children”. Edition 205.
Available in:. (With cut).
Question 1 – What is the purpose of the text above?
( ) explain something.
( ) tell a story.
( ) promote a product.
Question 2 – In the passage “[…] an equipment that uses detection technology!”, what equipment does the text refer to?
Question 3 – In “We can notice its action in many places: in malls, in banks, in some buildings It is stores.”, the highlighted term indicates:
( ) the sum of places.
( ) the alternation of places.
( ) the contrast between places.
Question 4 – Read back:
“When a person enters an environment monitored by such a sensor, their presence is detected by causing a variation of this energy in the place.”
The underlined fragment says:
( ) a cause.
( ) a condition.
( ) a consequence.
Question 5 – The segment “The infrared presence sensor still has a lens that divides the environment into regions.” It is:
( ) a narration.
( ) a description.
( ) an argument.
Question 6 – In "That This means that, in addition to detecting the infrared radiation emitted by heat sources, it also monitors variations in this energy [...]”, the word underlined:
( ) retrieves information.
( ) announces information.
( ) complements information.
Question 7 – According to the text, "if people are not very close to the sensor, they will probably not be detected". Why?
By Denyse Lage Fonseca
Graduated in Letters and specialist in distance education.