Question

VIII Studying)
mple paper are indicative of the level and
s that will be asked in ANTHE-2019)
ON-A: SCIENCE
rect I 4.
Which of the following can be used in a tester along
with a battery to detect a weak current in the circuit?
(1) LED only
(2) A coil wounded over a compass needle only
(3) Bulb of 100 W only
(4) Either LED or a coil wounded over a compass
needle
The characteristics of sound because of which voice
of female is shrill as compared to voice of male is
(1) Pitch
(2) Loudness
(3) Amplitude
(4) Wavelength​

Answer 1

Answer:

LED only and wavelength