Light -class 8 chapter 16 MCQ TEST

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Kerala PSC

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Light energy travels from the sun - In a form of wave and in straight line

When light falls on an object, it may - All of the above

When the distance between object and the plane mirror increses - Both A and C

Light shows - Rectilinear Propagation

A smooth shining surface which rebounds the light back in same or different direction is called - A mirror

Beam of light striking the reflecting surface is called : - Incident rays

Front balged part of eye ball is called : - Cornea

Which of the following statements is correct regarding rods and cones in human eyes? - Cones are sensative to dim light

In case of reflection of light the angle of incidence [i] and angle of reflection [r] are releted as - i = r

Visullay challenged people can read and write by using - Braille Script

What is the angle of incidence of a ray if reflected ray is at an angle of 90° to the incident ray - 45°

The diffect due to which a person is not able to see the distant object clearly - Myopia

The amount of light entering the eye is controlled by - Iris

Light enters the eye through - Pupil

When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called - Lateral inversion

Rainbow is a natural phenomenon showing - Reflection

In the retina of the eye, the area having no sensory cells is called - Blind spot

If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected? - 0°

To make a kaleidoscope we require - Three plane mirrors

In our eye _______ cells can sense colour - Cone

An owl can see clearly at night but not day time because it has - More rods and few cones

Part of the eye which controls the light entering is called - Iris

We can see a non-luminous object when light: - is reflected from the object towards our eye.

The impression of sensation remains on the retania for about may secounds after removal of the object - 1/16th of a sec

the cells present in the retina of eye and responding to intensity of low light are: - Rod - shaped cells

The cells present in the retina of eye and responding to color are: - Cones

The disease of eye in which crystalline lens becomes hazy or even opaque due to development of membrane over it is : - Cataract

Image formed by a plane mirror is: - Virtual, Behind the mirror and of same size as the object

The angle between incident ray and normal is called the called the angle of: - Incidence

The lens present in eyes is: - Convex lens

Kaledioscope is based on the pattern of: - Multiple reflection

When 2 mirrors are placed parallel to each other, and a candle is place in the center of the mirror no. of images will be formed. - Infinity

The difference in the color of the eye is due to difference in: - Iris

Band of seven colours is called: - VIBGYOR

Rainbow is formed after rain due to - Dispersion

The focal lenght of the eye-lens is changed by: - Ciliary Muscles

Far point of a normal human eye is situated at: - Infinity

The least distance of distinct vision for a young adult with normal vision is: - 25 cm

As the angle between 2 plane mirrors is decreased gradually, the no. of images of an object placed between them: - Increases gradually

A person who cannot see the near by object is said to be suffering from: - Hypermetropia