LED
Trending Questions
Q. A LED tester glows dim while checking the electrical conductivity of a liquid. The liquid is a _______ conductor of electricity.
- weak
- good
- strong
- bad
Q. Which of the following statements are true about a LED bulb?
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/439357/original_baebd.PNG)
- It glows only when high current passes through it.
- It can glow even when a low current passes through it.
- The longer terminal indicates the positive terminal.
- The shorter terminal indicates the positive terminal.
Q. Unlike electric bulb, LED glows even when a weak current flows through it.
- True
- False
Q. In the given figure, what should be the liquid `X' from the following options inorder to make the LED glow?
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/429249/original_Circuit_002_AP08PHY04_Ele_Cond_Liqs.PNG)
- Sugar solution
- Kerosene
- Vinegar
- Mustard oil
Q. While testing a tester, if the free ends of the tester are connected for long, a large flows and the drains out.
- current
- voltage
- battery
- wire
- bulb
Q. Which of the following is true for LEDs used in a tester?
- The shorter lead is always connected to the positive terminal of a battery.
- The longer lead is always connected to the positive terminal of a battery.
- Both the shorter as well as longer lead are connected to the positive terminal of a battery.
- Both the shorter as well as longer lead are connected to the negative terminal of a battery.
Q.
Which of the following are conductor(s) of electricity?
Distilled water and salt water
Distilled water
Tap water
Salt water
Q. In a circuit tester, LED bulb is used in place of a normal bulb because LED bulbs needs ______ electric current.
![](https://s3-us-west-2.amazonaws.com/tnl-content-images/moodle-migration/8714_c4c9fa59a33e070b0ff00efb42e37390841a1fdc_Screenshot_2.png)
![](https://s3-us-west-2.amazonaws.com/tnl-content-images/moodle-migration/8714_c4c9fa59a33e070b0ff00efb42e37390841a1fdc_Screenshot_2.png)
more
equivalent
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Q. A tester for detecting electric current utilizes some effect of electricity to detect its presence, which of the following can be used for this?
- Light bulb
- Magnetic compass
- Buzzer
- Fuse wire
Q. In a circuit tester, LED bulb is used in place of a normal bulb because LED bulbs needs ______ electric current.
![](https://s3-us-west-2.amazonaws.com/tnl-content-images/moodle-migration/8714_c4c9fa59a33e070b0ff00efb42e37390841a1fdc_Screenshot_2.png)
![](https://s3-us-west-2.amazonaws.com/tnl-content-images/moodle-migration/8714_c4c9fa59a33e070b0ff00efb42e37390841a1fdc_Screenshot_2.png)
alternate
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Q. Why do we prefer an LED instead of a bulb in a tester?
[2 marks]
[2 marks]
Q. Unlike electric bulb, LED glows even when a weak current flows through it.
- True
- False
Q. While testing a tester, if the free ends of the tester are connected for long, a large flows and the drains out.
- current
- voltage
- battery
- wire
- bulb
Q. LED is an abbreviation for:
- Lightning Emergency Drum
- Laser Emitting Disc
- Light Emitting Diode
- Laser Emitting Display
Q.
The part of the bulb that lightens up is knowns as terminal.
- True
- False
Q. LED stand for "Light Emitting Diode".
- False
- True
Q. While testing a tester, if the free ends of the tester are connected for long, a large flows and the drains out.
- current
- voltage
- battery
- wire
- bulb
Q. In the tester, LED bulb is used in place of a normal bulb because LED bulb needs ____ electric current in comparison. ![](https://search-static.byjusweb.com/question-images/byjus/tnl-content-images/moodle-migration/8714_c4c9fa59a33e070b0ff00efb42e37390841a1fdc_Screenshot_2.png)
![](https://search-static.byjusweb.com/question-images/byjus/tnl-content-images/moodle-migration/8714_c4c9fa59a33e070b0ff00efb42e37390841a1fdc_Screenshot_2.png)
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Q. In which of the following cases are we likely to see the LED light up?