Home
Class 10
PHYSICS
Assertion: LED bulb is a semi-conductor ...

Assertion: LED bulb is a semi-conductor device that emits visible light when an electric current passes through it.
Reason: LED television is one of the most important applications of light emitting diodes.

A

if both the assertion and the reason are true and the reason is the correct explanation of the assertion.

B

if both the assertion and the reason are true , but the reason is not the correct explanation of the assertion.

C

if the assertion is true, but Reason is false.

D

if assertion is false, but the reason is true.

Text Solution

Verified by Experts

both the assertion and the reason are true , but the reason is not the correct explanation of the assertion.
Promotional Banner

Topper's Solved these Questions

  • ELECTRICITY

    SURA PUBLICATION|Exercise ADDITIONAL QUESTIONS & ANSWRES (Use the Analogy to fill in the blank)|24 Videos
  • ELECTRICITY

    SURA PUBLICATION|Exercise ADDITIONAL QUESTIONS & ANSWRES (Arrange the following in a correct order)|2 Videos
  • ELECTRICITY

    SURA PUBLICATION|Exercise ADDITIONAL QUESTIONS & ANSWERS (Match the following )|10 Videos
  • ACOUSTICS

    SURA PUBLICATION|Exercise ADDITIONAL QUESTIONS & ANSWERS (VALUE B ASED QUESTION)|2 Videos
  • HALF YEARLY MODEL QUESTION PAPER

    SURA PUBLICATION|Exercise MCQ.s|24 Videos

Similar Questions

Explore conceptually related problems

The light emitting diode (LED) is

When electric current is passed through a bulb , the bulb gives light because of …………….

Assertion : Muscle wires are thin strands of wire made of shape memory alloys. Reason : They can contract by 5% when electric current is passed through them.

Assertion: In a series combination of electric bulbs, the bulb of 30 watts emits more light than that of lower bulbs. Reason: The 30W bulb in series gets more current than low power bulbs.

When electricity passes through a bulb, it gives off :1. Sound 2. Light 3. Electricity 4. Heat Choose the correct option from the codes given below :

A light emitting diode has a voltage drop of 2v across it when 10mA current is passed. If this LED is to operated with 6v battery the value of limiting resistor would be …………… .

You must have seen chandeliers having glass prism. The light from a tungsten bulb gets dispersed while passing through these prisms and we see coloured spectrum. If we use on LED light instead of tungsten bulb, will we be able to see the same effect ?

Assertion (A): Alkali metal salts with conc.HCl on heating gives characteristic coloured flame. Reason (R): The heat in the flame excited the valence electron to higher energy level and when it drops back, the excess energy emitted as light in the visible region gives colour