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Question-1
_________ is denoted by P.

(A) Principle focus	(B) Pole
(C) Principal axis	(D) None of these

Question-2
Army personnel and scouts use _____ for signalling

(A) Concave	(B) Convex
(C) Plane	(D) None of these

Question-3
A centre of a spherical mirror is called the

(A) Centre of curvature	(B) Pole of the mirror
(C) Axis of the mirror	(D) None of these

Question-4
A spherical mirror in which the outer surface is reflecting is called a ___________ mirror.

(A) Concave	(B) Convex
(C) Plane	(D) None of these

Question-5
In a concave mirror, the object is at infinity then the image formed is

(A) Infinity	(B) At the focus
(C) At the centre of curvature	(D) Behind the mirror

Question-6
The distance between the pole and the principle focus is called,

(A) Radius of curvature	(B) Principle axis
(C) Aperture	(D) Focal length

Question-7
In a concave mirror the object is at the focus, the image is at

(A) at infinity	(B) The focus
(C) Behind the mirror	(D) At the centre of curvature

Question-8
Radius of curvature, r =

(A) f/2	(B) 2f
(C) 2/3 f	(D) f

Question-9
An image formed by a plane mirror is a/an

(A) Virtual image	(B) real image
(C) Inverted image	(D) None of these

Question-10
Concave mirror is used in

(A) Solar devices	(B) Car headlights
(C) Dentist's mirror	(D) All of these

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Std 7

CBSE

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