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Andhra Pradesh SSC (Class 10) The Human Eye and the Colourful World — practice questions

Explore 32 free The Human Eye and the Colourful World questions in Andhra Pradesh SSC (Class 10) Science and Technology. Open each question or exercise to read its content, reference answers and available explanation.

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The Human Eye and the Colourful World questions and exercises with answers

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The retina of the eye is the:Read the answer and worked solution →The function of the iris is to:Read the answer and worked solution →Myopia (near-sightedness) is corrected by:Read the answer and worked solution →Hyperopia (far-sightedness) is corrected by:Read the answer and worked solution →The sky appears blue due to:Read the answer and worked solution →The colours of a rainbow are caused by:Read the answer and worked solution →The transparent front layer of the human eye is called the:Read the answer and worked solution →The image of an object is formed on the:Read the answer and worked solution →The least distance of distinct vision for a healthy adult human eye is about:Read the answer and worked solution →Power of accommodation of the eye is the ability of the eye lens to:Read the answer and worked solution →White light splits into its colours when passed through a prism. This phenomenon is called:Read the answer and worked solution →Which defect of vision is corrected by a concave lens?Read the answer and worked solution →Which defect of vision is corrected by a convex lens?Read the answer and worked solution →In the human eye, the size of the pupil is controlled by the:Read the answer and worked solution →Why does the sky appear blue during the day?Read the answer and worked solution →A near-sighted person can see only objects nearer than:Read the answer and worked solution →Power of a corrective lens is expressed in dioptres. One dioptre equals:Read the answer and worked solution →Presbyopia is caused by:Read the answer and worked solution →Which of the following causes night blindness?Read the answer and worked solution →A person can read a book at 30 cm but cannot read it at 25 cm. The defect is:Read the answer and worked solution →A myopic person uses a lens of focal length -1.5 m. The power of this lens is:Read the answer and worked solution →The splitting of white light by a prism into colours is due to:Read the answer and worked solution →Why does a hypermetropic eye have its near point farther than 25 cm?Read the answer and worked solution →A myopic eye can be corrected by:Read the answer and worked solution →The phenomenon of bending of light caused by gas density variations in the atmosphere is called:Read the answer and worked solution →Why are danger signals such as stop lights and fire engines coloured red?Read the answer and worked solution →Two convex lenses of focal lengths 20 cm and 50 cm are placed in contact. The power of the combination is:Read the answer and worked solution →Which of the following causes the colour of the clear sky to appear blue at noon?Read the answer and worked solution →The Tyndall effect refers to the:Read the answer and worked solution →A boy can see distant objects clearly but cannot read his textbook held at 25 cm. He suffers from:Read the answer and worked solution →

Worked practice questions

The retina of the eye is the:

  1. Light-sensitive screen
  2. Focusing element
  3. Front cover
  4. Coloured iris
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Correct answer: A. Light-sensitive screen

The human eye works similarly to a camera. Light enters through the cornea and lens, which act as the **focusing elements**. These elements focus the light onto the back surface of the eye called the **retina**. 1. **Function**: The retina contains millions of specialized cells called photoreceptors (rods and cones) that are sensitive to light. 2. **Conversion**: When light hits these cells, they convert light energy into electrical signals, which are sent to the brain via the optic nerve. 3. **Analogy**: Just as a movie is projected onto a screen to be seen, the lens of the eye projects an image onto the retina. Therefore, the retina acts as the **light-sensitive screen** of the eye. Matching the options: - **Focusing element**: Cornea and Lens - **Front cover**: Cornea - **Coloured iris**: Iris - **Light-sensitive screen**: Retina

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The function of the iris is to:

  1. Focus the image
  2. Control the size of the pupil
  3. Convert light to signals
  4. Carry signals to the brain
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Correct answer: B. Control the size of the pupil

The iris is the colored, ring-shaped muscular diaphragm located behind the cornea. Its primary biological function is to regulate the amount of light reaching the retina. 1. **Mechanism**: The iris consists of two sets of muscles: the sphincter pupillae (which constricts) and the dilator pupillae (which expands). 2. **Action**: These muscles adjust the diameter of the **pupil**, the central opening of the eye. 3. **Light Regulation**: - In bright light, the iris constricts the pupil to prevent overexposure. - In dim light, the iris dilates the pupil to allow more light to enter. Therefore, the correct function of the iris is to **control the size of the pupil**.

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Myopia (near-sightedness) is corrected by:

  1. A cylindrical lens
  2. A convex lens
  3. A concave lens
  4. Bifocals only
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Correct answer: C. A concave lens

Myopia, or near-sightedness, is a vision defect where a person can see nearby objects clearly but cannot see distant objects distinctly. This occurs because the light rays coming from a distant object converge **in front of the retina** instead of directly on it. This is typically caused by the eyeball being too long or the curvature of the eye lens being too great. To correct this, the focal point needs to be shifted further back. This is achieved by using a **concave lens** (also known as a diverging lens) of suitable power. The concave lens diverges the parallel light rays from a distant object before they enter the eye, causing them to appear as if they are coming from the eye's far point. Consequently, the eye's lens can then focus these rays exactly on the retina. Summary of corrections: - **Myopia (Near-sightedness):** Concave lens. - **Hypermetropia (Far-sightedness):** Convex lens. - **Astigmatism:** Cylindrical lens.

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