Physics

Question 1

1In an n-type semiconductor, the majority charge carriers are

Easy

A. holes B. electrons C. protons D. neutrons

Question 2

2In a potential divider with an LDR, the output voltage across the LDR rises when

Hard

A. light intensity falls B. light increases C. temperature falls D. the supply is removed

Question 3

3A microphone is a transducer that changes

Easy

A. sound energy into electrical energy B. light into heat C. electrical energy into sound D. heat into sound

Question 4

4A thermistor's resistance (NTC type) decreases when its

Easy

A. temperature falls B. temperature rises C. voltage is zero D. light falls

Question 5

5Which device changes electrical energy into sound?

Easy

A. solar cell B. thermistor C. loudspeaker D. microphone

Question 6

6A microphone converts

Easy

A. heat to light B. sound energy to electrical energy C. electrical energy to sound D. light to heat

Question 7

7A loudspeaker converts

Easy

A. light into sound B. electrical energy into sound energy C. sound into electrical energy D. heat into light

Question 8

8A transducer is a device that

Easy

A. blocks current B. stores charge C. only measures time D. converts one form of energy into another

Question 9

9In a p-type semiconductor, the majority charge carriers are

Medium

A. holes B. electrons C. neutrons D. protons

Question 10

10Silicon is a semiconductor because its conductivity

Easy

A. lies between that of conductors and insulators B. is very high C. is zero D. is the same as copper