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A Level Physics Practice Test: Electronics
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Electronics is the technology of using transistors and silicon chips, especially in devices such as radios, televisions, and computers.

A Level Physics Practice Test: Electronics
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24 Questions

1. To limit current in LED, resistor should be connected in
2. Actual op-amp may have an open loop gain of
3. Number of power supplies required to get output of op-amp is
4. Change in length and cross-sectional area of metal wire changes
5. In inverting amplifier, the phase difference between input and output voltages must be
6. Output current from an LED is
7. Amplifier produces output with more
8. A sensing device is also called
9. If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is
10. For non-inverting amplifier the input and output is
11. A component whose property changes when there is a change in any physical quantity of a device is
12. A light dependent resistor is made up of
13. A device used to avoid the relay destroying the op-amp is
14. Op-amp can provide maximum output current of
15. When temperature rises, resistance of negative temperature coefficient thermistor
16. Output resistance of an actual op-amp is
17. As long as op-amp is not saturated, the potential difference between inverting and non-inverting inputs is
18. Benefits of negative feedback include
19. LED starts to conduct when voltage is about
20. Graph of resistance of thermistor to temperature is
21. Impedance of ideal op-amp is
22. In an inverting amplifier the non-inverting input (+) is connected to
23. An infinite slew rate refers to
24. Coil of relay is connected to the

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