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Important Questions Test: Light


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20 Questions MCQ Test Science Class 8 | Important Questions Test: Light

Important Questions Test: Light for Class 8 2022 is part of Science Class 8 preparation. The Important Questions Test: Light questions and answers have been prepared according to the Class 8 exam syllabus.The Important Questions Test: Light MCQs are made for Class 8 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Light below.
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Important Questions Test: Light - Question 1

The ray of light striking at the reflecting surface is called

Detailed Solution for Important Questions Test: Light - Question 1

A is the correct option.A beam of light striking the reflecting surface is called incident ray.
 An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence. The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface.
 

Important Questions Test: Light - Question 2

The angle of incidence is always ______ to the angle of reflection.

Important Questions Test: Light - Question 3

There are ______ laws of reflection.

Detailed Solution for Important Questions Test: Light - Question 3

The two laws of reflection are as follows:

1. The incident ray, the reflected ray, and the normal to the reflecting interface at the point of incidence all lie in the same plane.

2. The angle of incidence equals the angle of reflection.
 

Important Questions Test: Light - Question 4

The process of banding of seven colours is called

Detailed Solution for Important Questions Test: Light - Question 4

The phenomenon of splitting of white light into seven constituent colors is known as dispersion. And, the band of seven colours obtained on the screen is known as spectrum.

Important Questions Test: Light - Question 5

The image formed by plane mirror is

Detailed Solution for Important Questions Test: Light - Question 5

Plane mirrors are the only type of mirror for which a real object always produces an image that is virtual, errect and of the same size as the object.

Important Questions Test: Light - Question 6

The image that can be obtained on the screen is called

Detailed Solution for Important Questions Test: Light - Question 6

An image which can be obtained on a screen is called a real image.

Images are of two types: real images and virtual images. Real images are formed on a screen, whereas virtual images cannot be formed on the screen.

Important Questions Test: Light - Question 7

Reflection from a smooth surface is

Important Questions Test: Light - Question 8

 Angle between normal and incident ray is called

Detailed Solution for Important Questions Test: Light - Question 8

The correct answer is B as angle between normal and incident ray is called angle of incidence.

Important Questions Test: Light - Question 9

An example of luminous object is

Important Questions Test: Light - Question 10

An example of night bird is

Important Questions Test: Light - Question 11

Cones and rods are the light sensitive cells.

Detailed Solution for Important Questions Test: Light - Question 11

Photoreceptors in the retina are classified into two groups, named after their physical morphologies. Rod cells are highly sensitive to light and function in nightvision, whereas cone cells are capable of detecting a wide spectrum of light photons and are responsible for colour vision.

Important Questions Test: Light - Question 12

Kaleidoscope is based on the principle of spectrum.

Detailed Solution for Important Questions Test: Light - Question 12

B is the correct option. It si false,actually the Kaleidoscope is based on the principle of multiple reflection. according to this the light ray get reflected by these multiple mirror. when a light ray falls on one mirror , then it get reflected to the another one.

Important Questions Test: Light - Question 13

Rods are sensitive to bright light.

Detailed Solution for Important Questions Test: Light - Question 13

B is the correct option.There are 2 types of photoreceptors in the retina: rods and cones. The rods are most sensitive to light and dark changes, shape and movement and contain only one type of “light-sensitive pigment”. Rods are not good for color vision. Cones, however, work only in bright light. So the statement is true.

Important Questions Test: Light - Question 14

The image formed by plane mirror is laterally inverted.

Important Questions Test: Light - Question 15

Angle of incidence is greater than angle of reflection.

Important Questions Test: Light - Question 16

Cones of our eye are responsible for colour vision.

Detailed Solution for Important Questions Test: Light - Question 16

Cone cells, or cones are photoreceptor cells  in the retinas of vertebrate eyes including the human eye. They respond differently to light of different wavelength, and are thus responsible for color vision, and function best in relatively bright light.

Important Questions Test: Light - Question 17

On blind spot there are no sensory cells.

Detailed Solution for Important Questions Test: Light - Question 17

The blind spot is the area on the retina without receptors that respond to light. Therefore an image that falls on this region will NOT be seen. It is in this region that the optic nerve exits the eye on its way to the brain.

Important Questions Test: Light - Question 18

 If particles of dust enter our eyes then we should rub eye properly.

Important Questions Test: Light - Question 19

 Two mirrors inclined to each other give multiple images.

Important Questions Test: Light - Question 20

Visually challenged persons can read and write using the Braille system.

Detailed Solution for Important Questions Test: Light - Question 20

Braille is the language in which holes are done in page and in special language which is taught to blind people which is sensible by touching by fingers. 
Thus the given statement is true.

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