Section 2: Uses of sensors

Question 1

Temperature sensor

Answer 1

Automatic washing machines, automatic cookers, central heating
controllers, computer-controlled greenhouses, scientific experiments
and environmental monitoring

Question 2

Pressure sensor

Answer 2

Burglar alarms, automatic washing machines, robotics, production line
control, scientific experiments and environmental monitoring

Question 3

Light sensor

Answer 3

Computer controlled greenhouses, burglar alarm systems, robotics,
production line control, scientific experiments and environmental
monitoring

Question 4

Graphics tablet

Answer 4

Inputting freehand drawings or retouch photographs

Question 5

Optical Mark Reader

Answer 5

Inputting pencil marks on a form such as a school register, candidate
exam answers, any application involving input of a choice of options

Question 6

Optical Character Reader

Answer 6

Inputting text to a computer ready for processing by another software
package such as word processors, spreadsheets, databases etc.

Question 7

Bar code Reader

Answer 7

Inputting code numbers from products at a POS terminal, library books
and membership numbers

Question 8

Video camera

Answer 8

Inputting moving pictures, often pre-recorded, into a computer

Question 9

Web Cam

Answer 9

Inputting moving pictures from a fixed position into a computer

Question 10

Light Pen

Answer 10

Where desktop space is limited, it is used instead of a mouse or for
drawing applications where a graphics tablet might be too big