Download App

Current Electricity — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSCurrent Electricity1 Mark
MCQ
The most non-polluting and efficient lighting device is :
  • A
    $CFL$
  • ✓
    $LED$
  • C
    Fluorescent light
  • D
    Electric bulb
✓

Answer

Correct option: B.
$LED$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Current Electricity→Current Electricity — all question types→PHYSICS STD 9 question papers→ICSE Board STD 9 question papers→ICSE Board question paper generator→

Similar questions

In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is:
→
A body is projected vertically upward with an initial velocity $u.$ If acceleartion due to gravity is $g,$ the time for which it remains in air , is :
→
The green house gas is :
→
The unit $Nm ^2$ is the unit of
→
The longitudinal waves can propagate only in .
→
Which of the following is best conductor of electricity?
→
A ray of light is incident on a concave mirror. If it is parallel to principal axis, the reflected ray will:
→
The unit of retardation is $..........$
→
The speed of sound in air at $0^\circ C$ is nearly :
→
With the increase in the density of the fluid, the upthrust experienced by a body immersed in it:
→