The device used for seeing over the heads of crowds is
(a) periscope
(b) kaleidoscope
(c) prism
(d) telescope

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Solution

(a) periscope

A periscope is used for seeing over the heads of crowds.

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Similar questions

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

(d) stethoscope

What is the tall device which contains plane mirror and can be used to see over the heads of crowds ( say,as in a football match)

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