BTEC Applied Science - Physics Exam
Questions
State what is meant by the term analogue signal (1 mark) - ANSWERA signal that can have any value
State what is meant by the term digital signal (1 mark) - ANSWERA signal that has 2 values only which
are 0 and 1.
Explain 2 advantages of using digital signals instead of analogue signals to transmit television
programmes. (2 marks) - ANSWER1. Digital Signals can carry more info than Analogue signals.
2. Less interference so better quality is produced.
Give 2 other differences between visible light waves and sound waves. (2 marks) - ANSWER1. Visible
light is electromagnetic whereas sound is a vibration
2. Sound waves has a lower frequency than visible light.
Explain the advantages and disadvantages of using radio waves instead of light waves to send large
amounts of information from the satellite to the surface of the Earth. (4 marks) - ANSWER1. Light waves
have a higher frequency than radio waves so light waves would take less time to transfer information.
2. Some of the radio waves reach the Earth's surface so they receive a clear signal.
Evaluate the strengths and weaknesses of using:
• An infrared remote control
• A Bluetooth remote control
to control the home cinema system. (6 marks) - ANSWER1. Infrared doesn't interfere with other devices
- has higher frequency than Bluetooth
2. This means there will be better quality between the devices.
Questions
State what is meant by the term analogue signal (1 mark) - ANSWERA signal that can have any value
State what is meant by the term digital signal (1 mark) - ANSWERA signal that has 2 values only which
are 0 and 1.
Explain 2 advantages of using digital signals instead of analogue signals to transmit television
programmes. (2 marks) - ANSWER1. Digital Signals can carry more info than Analogue signals.
2. Less interference so better quality is produced.
Give 2 other differences between visible light waves and sound waves. (2 marks) - ANSWER1. Visible
light is electromagnetic whereas sound is a vibration
2. Sound waves has a lower frequency than visible light.
Explain the advantages and disadvantages of using radio waves instead of light waves to send large
amounts of information from the satellite to the surface of the Earth. (4 marks) - ANSWER1. Light waves
have a higher frequency than radio waves so light waves would take less time to transfer information.
2. Some of the radio waves reach the Earth's surface so they receive a clear signal.
Evaluate the strengths and weaknesses of using:
• An infrared remote control
• A Bluetooth remote control
to control the home cinema system. (6 marks) - ANSWER1. Infrared doesn't interfere with other devices
- has higher frequency than Bluetooth
2. This means there will be better quality between the devices.
