The device used for detecting charge (positive or negative) on an object is called:

(a) stethoscope (b) telescope (c) kaleidoscope (d) electroscope

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is:

(a) electroscope

(b) kaleidoscope

(c) periscope

(d) stethoscope

Question 1

An electroscope is a device which is used to find if an object is
(a) charged
(b) magnetic
(c) free of cracks
(d) hot

How will you use a pith ball electroscope to find out whether the charge on a charged body is positive or negative?