Kerala (English Medium) Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
Refractive index of kerosene is

(A) 1.33	(B) 1.49
(C) 1.44	(D) 2.42

Question-2
Which of the following lens is thicker in the middle and thinner at the edges ?

(A) Convex lens	(B) Concave lens
(C) Prism	(D) None of these

Question-3
The point at which the incident ray meets the separating surface is called

(A) Point of incidence	(B) Point of refraction
(C) Point of diversion	(D) None of these

Question-4
Law of photoelectric effect was discovered by

(A) Sir Isaac Newton	(B) Christian Huygens
(C) Willebrord Snell	(D) Albert Einstein

Question-5
The exposed surface of the human eye ball has a transparent covering called

(A) Iris	(B) Pupil
(C) Cornea	(D) Retina

Question-6
Which of the following help us to see tiny objects which are magnified many more times than a simple microscope ?

(A) Compound microscope	(B) Telescope
(C) Stethoscope	(D) None of these

Question-7
Which of the following joins the centres of curvatures of the two spherical surface of the lens?

(A) Centre of curvature	(B) Radius of curvature
(C) Principal axis	(D) Optical centre

Question-8
Behind the cornea of human eye, is the opaque muscular diaphragm called

(A) Iris	(B) Pupil
(C) Retina	(D) Ciliary muscles

Question-9
The distance between the optical centre and the principal focus of a lens is known as

(A) Optical centre	(B) Principal focus
(C) Focal length	(D) None of these

Question-10
The ability of the eye lens to self adjust its focal length is termed as the

(A) Power of accomodation	(B) Persistance of vision
(C) Reflection of light	(D) None of these

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Std 9

Kerala (English Medium)

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