Test: Light - 4


20 Questions MCQ Test Science Class 8 | Test: Light - 4


Description
This mock test of Test: Light - 4 for Class 8 helps you for every Class 8 entrance exam. This contains 20 Multiple Choice Questions for Class 8 Test: Light - 4 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Light - 4 quiz give you a good mix of easy questions and tough questions. Class 8 students definitely take this Test: Light - 4 exercise for a better result in the exam. You can find other Test: Light - 4 extra questions, long questions & short questions for Class 8 on EduRev as well by searching above.
QUESTION: 1

The ray of light striking at the reflecting surface is called

Solution:

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.
 

QUESTION: 2

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

Solution:
QUESTION: 3

There are ______ laws of reflection.

Solution:

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.
 

QUESTION: 4

The process of banding of seven colours is called

Solution:

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.

QUESTION: 5

The image formed by plane mirror is

Solution:

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.

QUESTION: 6

The image that can be obtained on the screen is called

Solution:

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.

QUESTION: 7

Reflection from a smooth surface is

Solution:
QUESTION: 8

 Angle between normal and incident ray is called

Solution:

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

QUESTION: 9

An example of luminous object is

Solution:
QUESTION: 10

An example of night bird is

Solution:
QUESTION: 11

Cones and rods are the light sensitive cells.

Solution:

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.

QUESTION: 12

Kaleidoscope is based on the principle of spectrum.

Solution:

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.

QUESTION: 13

Rods are sensitive to bright light.

Solution:

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 false.

QUESTION: 14

The image formed by plane mirror is laterally inverted.

Solution:
QUESTION: 15

Angle of incidence is greater than angle of reflection.

Solution:
QUESTION: 16

Cones of our eye are responsible for colour vision.

Solution:

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.

QUESTION: 17

On blind spot there are no sensory cells.

Solution:

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.

QUESTION: 18

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

Solution:
QUESTION: 19

 Two mirrors inclined to each other give multiple images.

Solution:
QUESTION: 20

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

Solution:

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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