Curriculum
Course: Igcse Physics
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Curriculum

Igcse Physics

1. Motion, Forces and Energy

0/161 Dr Dabour Hub Science Diagram and Course Material

2. Thermal Physics

0/75 Dr Dabour Hub Science Diagram and Course Material

3. Waves

0/77 Dr Dabour Hub Science Diagram and Course Material

4. Electricity and Magnetism

0/119 Dr Dabour Hub Science Diagram and Course Material

5. Nuclear Physics

0/39 Dr Dabour Hub Science Diagram and Course Material

6. Space Physics

0/47 Dr Dabour Hub Science Diagram and Course Material
Quiz

3.3.5 Digital and Analogue Signals – Check yourself

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1.
A digital signal consists of
pulses of two levels
sound waves
white noise
continuous smooth variations
2.
An advantage of digital transmission is that
it never errors
noise can be removed
it needs no conversion
it uses less bandwidth always
3.
A signal is sampled 8 000 times per second with 8 bits per sample. The data rate is
1 000 bit/s
8 000 bit/s
64 000 bit/s
640 000 bit/s
4.
An amplifier in an analogue system also amplifies
the noise
only the signal
only the pulses
the sampling rate
5.
Which is an analogue quantity?
A binary number
The voltage from a microphone
A computer file
A pulse train
6.
A higher sampling rate gives
no change
a less accurate reproduction
a more accurate reproduction
analogue output
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