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Class 8 Exam  >  Class 8 Tests  >  Science Class 8  >  Test: Light - 2 - Class 8 MCQ

Test: Light - 2 - Class 8 MCQ


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15 Questions MCQ Test Science Class 8 - Test: Light - 2

Test: Light - 2 for Class 8 2024 is part of Science Class 8 preparation. The Test: Light - 2 questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Light - 2 MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Light - 2 below.
Solutions of Test: Light - 2 questions in English are available as part of our Science Class 8 for Class 8 & Test: Light - 2 solutions in Hindi for Science Class 8 course. Download more important topics, notes, lectures and mock test series for Class 8 Exam by signing up for free. Attempt Test: Light - 2 | 15 questions in 15 minutes | Mock test for Class 8 preparation | Free important questions MCQ to study Science Class 8 for Class 8 Exam | Download free PDF with solutions
Test: Light - 2 - Question 1
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What is the main purpose of using optical aids for visually impaired individuals?

Detailed Solution for Test: Light - 2 - Question 1
Optical aids are used to correct or enhance vision for visually impaired individuals. These include devices such as magnifiers, bifocal lenses, and contact lenses.
Test: Light - 2 - Question 2
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What should you do if particles of dust enter your eyes?

Detailed Solution for Test: Light - 2 - Question 2
If particles of dust enter your eyes, you should wash your eyes with clean water to remove the particles. Rubbing your eyes can cause further irritation or damage.
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Test: Light - 2 - Question 3
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How does a periscope allow one to see objects that are not directly visible?

Detailed Solution for Test: Light - 2 - Question 3
A periscope enables visibility of objects that are not directly in sight by employing two plane mirrors arranged at angles to reflect light from the objects to the viewer's eyes. This arrangement allows one to see over obstacles or around corners.
Test: Light - 2 - Question 4
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What is the purpose of using a periscope in submarines and tanks?
Detailed Solution for Test: Light - 2 - Question 4
A periscope is used in submarines and tanks to view objects outside without needing a direct line of sight. This is achieved by reflecting light through a series of mirrors.
Test: Light - 2 - Question 5
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What is the role of the retina in the process of vision?
Detailed Solution for Test: Light - 2 - Question 5
The retina processes visual information by converting light into neural signals, which are then sent to the brain through the optic nerve for interpretation.
Test: Light - 2 - Question 6
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What happens to the light entering the eye once it passes through the cornea and pupil?
Detailed Solution for Test: Light - 2 - Question 6
After passing through the cornea and pupil, light is focused on the retina by the lens. The retina then processes the light and sends visual information to the brain through the optic nerve.
Test: Light - 2 - Question 7
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How does a lens in the human eye adjust to focus on different distances?
Detailed Solution for Test: Light - 2 - Question 7
The lens in the human eye changes its curvature to focus light on the retina for objects at different distances. This adjustment helps in clear vision of both near and distant objects.
Test: Light - 2 - Question 8
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__________ are used to enhance the vision of visually impaired persons and include devices like talking calculators.
Detailed Solution for Test: Light - 2 - Question 8

Non-optical aids, such as talking calculators and electronic devices, help visually impaired persons perform various tasks by using sound or tactile feedback instead of visual input.

Test: Light - 2 - Question 9
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Which part of the human eye is resposible for color perception?
Detailed Solution for Test: Light - 2 - Question 9

Cones are responsible for the color perception in our eyes. Rods help in sharpness of the image. Cones are sensitive to bright light whereas rods are sensitive to dim light.

Test: Light - 2 - Question 10
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What visual defect is commonly associated with aging and results from a cloudy lens?
Detailed Solution for Test: Light - 2 - Question 10
Cataract is a visual defect associated with aging, where the lens becomes cloudy, leading to a loss of vision. It can be treated by removing the opaque lens and replacing it with an artificial one.
Test: Light - 2 - Question 11
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The persistent impression of an image on the retina for about 1/16th of a second allows us to perceive what phenomenon?
Detailed Solution for Test: Light - 2 - Question 11
The persistence of an image on the retina for about 1/16th of a second helps us perceive continuous motion. This is why a series of still images, when flashed quickly, are perceived as smooth, continuous motion.
Test: Light - 2 - Question 12
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What is the result of looking directly at the Sun or a powerful light source?
Detailed Solution for Test: Light - 2 - Question 12
Looking directly at the Sun or a powerful light source can cause retinal injury due to the intense light damaging the sensitive cells in the retina. This can lead to permanent vision damage.
Test: Light - 2 - Question 13
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What visual condition results when a person cannot see distant objects clearly but can see nearby objects well?
Detailed Solution for Test: Light - 2 - Question 13
Myopia, or nearsightedness, is a condition where a person can see nearby objects clearly but has difficulty seeing distant objects. Corrective lenses can help focus light correctly on the retina.
Test: Light - 2 - Question 14
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What is the common treatment for cataracts?
Detailed Solution for Test: Light - 2 - Question 14
The common treatment for cataracts is the surgical removal of the opaque lens and its replacement with an artificial lens, which restores clear vision.
Test: Light - 2 - Question 15
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How does the lens in the human eye adjust to focus on near and distant objects?
Detailed Solution for Test: Light - 2 - Question 15
The lens in the human eye adjusts its shape to focus on objects at varying distances. This process, known as accommodation, helps in clearly viewing both near and distant objects.
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