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Practice Paper

Prepared by: learnloophq@gmail.com

Last edited 26 days ago by Learn LoopHQ.

Answer key

Chapter: 06. Light

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Light: Practice Exam

Total Marks: 50 Time Allotted: 60 minutes

Instructions:

Read each question carefully before answering.

Answer all questions.

Write your answers clearly in the space provided.

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I. Multiple Choice Questions (5 Marks)

Choose the correct option for each question.

Which of the following is a luminous object? a. The Moon b. A chair c. A lit candle d. A book

The property of light travelling in a straight line is called: a. Light reflection b. Rectilinear propagation of light c. Light bending d. Shadow formation

The image formed by a pinhole camera is always: a. Virtual and erect b. Real and inverted c. Virtual and inverted d. Real and erect

Which type of object does NOT allow light to pass through it at all? a. Transparent b. Translucent c. Opaque d. Luminous

A lunar eclipse occurs when the Earth is positioned: a. Between the Sun and the Moon b. Between the Moon and the Sun c. After the Moon, away from the Sun d. Ahead of the Sun

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II. Fill in the Blanks (5 Marks)

Complete the following sentences with the correct words.

Light is a form of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ that causes the sensation of vision.

The working of a pinhole camera is based on the principle of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

For a shadow to form, an _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ object must obstruct the path of light.

The central darkest part of a shadow is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ region.

A solar eclipse always occurs on a _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ day.

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III. True/False Questions (5 Marks)

State whether each statement is True (T) or False (F).

Light itself is invisible; we see its path only when it illuminates dust particles. (T/F)

Increasing the size of the pinhole in a pinhole camera will make the image clearer. (T/F)

A lunar eclipse happens every full moon night. (T/F)

It is safe to view a solar eclipse directly with naked eyes. (T/F)

A translucent object casts a very dark and distinct shadow. (T/F)

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IV. Short Answer Questions (10 Marks)

Answer the following questions in 1-2 sentences.

What are luminous objects? Give an example.

Explain why a clear glass window does not cast a shadow.

What is magnification in the context of a pinhole camera?

Name the two main types of natural shadows or eclipses.

Why do shadows appear shortest at noon?

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V. Diagram-Based Questions (10 Marks)

Question 1: The image shows a person attempting to see a candle flame through a bent tube.

{

"image_description": "A person looking through a bent, hollow tube towards a lit candle.",

"style": "simple, schematic diagram",

"elements_to_include": ["eye", "bent hollow tube", "lit candle flame", "dashed line indicating attempted line of sight"],

"keywords_for_ai_generator": ["rectilinear propagation", "light experiment", "bent tube", "candle flame", "sight"]

}

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What property of light is this setup designed to illustrate? (2 Marks)

Will the person be able to see the candle flame clearly? Explain why. (3 Marks)

Question 2: The image shows a spherical object casting a shadow from an extended light source.

{

"image_description": "A diagram showing a large light source (like a torch) illuminating an opaque spherical object (like a ball), casting a shadow on a flat screen. The shadow clearly shows a central dark region and a surrounding lighter region.",

"style": "scientific illustration, ray diagram",

"elements_to_include": ["large light source", "opaque ball", "screen", "light rays diverging from source", "umbra region (darkest)", "penumbra region (lighter)"],

"keywords_for_ai_generator": ["shadow formation", "umbra", "penumbra", "extended light source", "light rays", "opaque object"]

}

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Identify the two distinct regions of the shadow. (2 Marks)

Why does this type of light source create both a central dark and a surrounding lighter region in the shadow? (3 Marks)

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VI. Long Answer Questions (10 Marks)

Answer the following questions in 4-5 sentences.

Describe the construction and working principle of a simple pinhole camera. (5 Marks)

Explain the difference between a total solar eclipse and a total lunar eclipse, including the alignment of the Sun, Earth, and Moon for each. (5 Marks)

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VII. Identifying and Differentiate Concepts (5 Marks)

Categorize the following objects based on how light interacts with them (Transparent, Translucent, Opaque):

Wood: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Clear Glass: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Butter Paper: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Steel Spoon: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Frosted Glass: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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