Samacheer Kalvi Class 8 Science Light Questions - 1
Question: 1
The distance from the pole to the focus is called
(A) Pole length
(B) Principal axis
(C) Focal length
(D) None of the above
Ans: C
Focal length
Question: 2
The refractive index of water is ______
(A) 1.0
(B) 1.33
(C) 1.44
(D) 1.52
Ans: B
1.33
Question: 3
The phenomenon of light passing through the object is called
(A) Refraction
(B) Reflection
(C) Total internal reflection
(D) Dispersion
Ans: A
Refraction
Question: 4
Which surface will not reflect most of the light falling on them?
(A) Opaque surface
(B) Shining surface
(C) Smooth surface
(D) Rough surface
Ans: D
Rough surface
Question: 5
Mirrors having a curved reflecting surface are called as
(A) Simple mirrors
(B) Plane mirrors
(C) Spherical mirrors
(D) None of the above
Ans: C
Spherical mirrors
Question: 6
The imaginary line passing through the centre of curvature and pole of a spherical mirror is called
(A) Principal axis
(B) Pole
(C) Radius of curvature
(D) Centre of curvature
Ans: A
Principal axis
Question: 7
Focal length is equal to half of the
(A) Axis
(B) Centre of curvature
(C) Radius of curvature
(D) None of the above
Ans: C
Radius of curvature
Question: 8
The ENT doctor uses a _____
(A) Convex lens
(B) Convex mirror
(C) Concave mirror
(D) Plane mirror
Ans: C
Concave mirror
Question: 9
The spherical mirror used as a rear view mirror in the vehicle is _____
(A) Plane mirror
(B) Convex mirror
(C) Concave mirror
(D) None of the above
Ans: B
Convex mirror
Question: 10
The spherical mirror with a reflecting surface curved inward is called _____
(A) Curved mirror
(B) Convex mirror
(C) Concave mirror
(D) None of the above
Ans: C
Concave mirror
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