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Photoresistor and phototransistor sensor

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.

Photoresistor sensor is made of a _________________ material

a)

Insulator

b)

Conductor

c)

Semiconductor

2.

A photoresistor is an electronic component whose electrical resistance ________________________________when it is exposed to light.

a)

changes

b)

increases

c)

doesn't change

3.

Phototransistor sensor is a __________________ that reacts to brightness

a)

sensor

b)

feeler

c)

indicator

4.

To build a light barrier in a car parking gate mechanism we need a _____________ .

a)

Photoresistor sensor

b)

Phototransistor sensor

5.

We use a __________________ to switch off the light automatically.

a)

Photoresistor sensor

b)

Phototransistor sensor

6.

The output of the _________________ is only one or zero.

a)

digital sensor

b)

passive sensor

7.

A sensor that has a negative pole and a positive pole it means it has ___________.

a)

resistance

b)

polarity

8.

Resistance of photoresistor sensor is low in brightness

a)

True

b)

False

9.

Phototransistor sensor is an indicator for the brightness of the light.

a)

True

b)

False

10.

Phototransistor sensor doesn't have polarity

a)

True

b)

False

11.

To build a light barrier in a hand dryer mechanism we need a _____________

a)

Photoresistor sensor

b)

Phototransistor sensor

12.

Light sensor doesn't have polarity

a)

True

b)

False

13.

Photoresistor sensor is an insulator in darkness.

a)

True

b)

False

14.

A semiconductor material has an electrical conductivity value falling between that of a conductor, such as metallic copper, and an insulator, such as glass.

a)

True

b)

False

15.

The Photoresistor sensor, which is an analog brightness sensor, reacts to daylight and changes its resistance value due to this. This is an indicator for the brightness of the light.

a)

True

b)

False