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All questions of Sound and Light for Grade 4 Exam
What happens to the length of a shadow as the sun rises and sets?- a) It disappears completely.
- b) It remains the same.
- c) It changes color.
- d) It gets longer and shorter.
Correct answer is option 'D'. Can you explain this answer?
What happens to the length of a shadow as the sun rises and sets?
a)
It disappears completely.
b)
It remains the same.
c)
It changes color.
d)
It gets longer and shorter.
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Nclex Coaching Centre answered |
The length of a shadow changes as the sun rises and sets. Shadows are longest in the early morning and late afternoon when the sun is low in the sky, and shortest at noon when the sun is directly overhead.
Which of the following phenomena occurs when light is reflected?- a) Light is scattered
- b) Light is absorbed
- c) Light bounces back
- d) Light bends
Correct answer is option 'C'. Can you explain this answer?
Which of the following phenomena occurs when light is reflected?
a)
Light is scattered
b)
Light is absorbed
c)
Light bounces back
d)
Light bends
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Nclex Coaching Centre answered |
When light is reflected, it bounces back from a surface. This phenomenon is what allows us to see objects, as the light reflected from them enters our eyes. Reflective surfaces, like mirrors, are particularly effective at this.
What is the primary natural source of light essential for all living things?- a) Stars
- b) The sun
- c) Electric bulbs
- d) The moon
Correct answer is option 'B'. Can you explain this answer?
What is the primary natural source of light essential for all living things?
a)
Stars
b)
The sun
c)
Electric bulbs
d)
The moon
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Nclex Coaching Centre answered |
The sun is considered the primary natural source of light, vital for photosynthesis in plants and the survival of many organisms. It provides energy and warmth, impacting climate and weather patterns, and is fundamental to life on Earth.
When light passes through a prism, what phenomenon occurs?- a) Absorption
- b) Diffusion
- c) Reflection
- d) Refraction
Correct answer is option 'D'. Can you explain this answer?
When light passes through a prism, what phenomenon occurs?
a)
Absorption
b)
Diffusion
c)
Reflection
d)
Refraction
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Nclex Coaching Centre answered |
Refraction occurs when light changes direction as it passes through different materials, such as a prism. This bending of light causes the separation of white light into its constituent colors, often remembered by the acronym VIBGYOR (violet, indigo, blue, green, yellow, orange, red).
What is the significance of the term "VIBGYOR"?- a) It describes the speed of light.
- b) It refers to types of luminous objects.
- c) It indicates properties of opaque materials.
- d) It represents the colors of the rainbow.
Correct answer is option 'D'. Can you explain this answer?
What is the significance of the term "VIBGYOR"?
a)
It describes the speed of light.
b)
It refers to types of luminous objects.
c)
It indicates properties of opaque materials.
d)
It represents the colors of the rainbow.
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Nclex Coaching Centre answered |
"VIBGYOR" is an acronym that represents the colors of the rainbow: Violet, Indigo, Blue, Green, Yellow, Orange, and Red. This sequence is a result of light being refracted through a prism, showcasing how white light can be separated into its constituent colors. Understanding this concept is essential in optics and color theory.
What type of materials do not allow any light to pass through?- a) Reflective
- b) Opaque
- c) Translucent
- d) Transparent
Correct answer is option 'B'. Can you explain this answer?
What type of materials do not allow any light to pass through?
a)
Reflective
b)
Opaque
c)
Translucent
d)
Transparent
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|
Nclex Coaching Centre answered |
Opaque materials do not allow any light to pass through, completely blocking light. This property distinguishes them from transparent materials, which allow light to pass freely, and translucent materials, which permit some light while obstructing clear visibility.
Shadows are longest at which time of day?- a) Noon
- b) Midnight
- c) Morning
- d) Evening
Correct answer is option 'C'. Can you explain this answer?
Shadows are longest at which time of day?
a)
Noon
b)
Midnight
c)
Morning
d)
Evening
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Nclex Coaching Centre answered |
Shadows are longest in the morning and evening due to the low angle of the sun in the sky. At midday, when the sun is directly overhead, shadows are shortest. This change in shadow length is a direct result of the sun's position relative to the Earth.
What type of materials block all light from passing through?- a) Reflective
- b) Translucent
- c) Transparent
- d) Opaque
Correct answer is option 'D'. Can you explain this answer?
What type of materials block all light from passing through?
a)
Reflective
b)
Translucent
c)
Transparent
d)
Opaque
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Nclex Coaching Centre answered |
Opaque materials completely block light from passing through. Examples include wood and metal. In contrast, transparent materials allow light to pass through, while translucent materials permit only some light.
Which of the following statements is true regarding non-luminous objects?- a) They emit heat along with light.
- b) They can be seen in complete darkness.
- c) They reflect light from luminous objects.
- d) They produce their own light.
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is true regarding non-luminous objects?
a)
They emit heat along with light.
b)
They can be seen in complete darkness.
c)
They reflect light from luminous objects.
d)
They produce their own light.
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Nclex Coaching Centre answered |
Non-luminous objects do not produce their own light; instead, they reflect light from luminous objects. This means they can only be seen when illuminated by a light source, such as the sun or a lamp.
Which object can create a shadow?- a) A wooden table
- b) A mirror
- c) A glass cup
- d) A clear plastic sheet
Correct answer is option 'A'. Can you explain this answer?
Which object can create a shadow?
a)
A wooden table
b)
A mirror
c)
A glass cup
d)
A clear plastic sheet
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|
Nclex Coaching Centre answered |
A wooden table is an opaque object, which can block light and thus create a shadow. In contrast, transparent objects like a glass cup allow light to pass through completely and do not produce shadows. Shadows are formed only when light is obstructed by opaque or translucent materials.
Which of the following objects creates faint shadows?- a) A book
- b) A frosted glass
- c) A wall
- d) A metal chair
Correct answer is option 'B'. Can you explain this answer?
Which of the following objects creates faint shadows?
a)
A book
b)
A frosted glass
c)
A wall
d)
A metal chair
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|
Nclex Coaching Centre answered |
Frosted glass is a translucent material that allows some light to pass through, thus creating faint shadows. In contrast, opaque materials like books and walls create dark shadows, while transparent objects do not create shadows at all.
Why do objects appear bent when viewed in water?- a) Refraction
- b) Reflection
- c) Diffraction
- d) Transmission
Correct answer is option 'A'. Can you explain this answer?
Why do objects appear bent when viewed in water?
a)
Refraction
b)
Reflection
c)
Diffraction
d)
Transmission
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Nclex Coaching Centre answered |
Objects appear bent when viewed in water due to refraction, which occurs because light bends when it passes from air into water. This bending of light changes the apparent position of the object, making it seem distorted.
Which of the following is a characteristic of luminous objects?- a) They produce their own light.
- b) They are always natural.
- c) They do not emit heat.
- d) They reflect light from other sources.
Correct answer is option 'A'. Can you explain this answer?
Which of the following is a characteristic of luminous objects?
a)
They produce their own light.
b)
They are always natural.
c)
They do not emit heat.
d)
They reflect light from other sources.
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Nclex Coaching Centre answered |
Luminous objects are defined as those that produce their own light, such as the sun, stars, and artificial sources like bulbs. Unlike non-luminous objects, which can only reflect light, luminous objects can generate light independently. This characteristic allows them to be visible in darkness, distinguishing them from other types of materials.
What is the role of the sun in relation to the moon?- a) The moon produces its own light.
- b) The sun and moon both produce light.
- c) The sun produces light; the moon reflects it.
- d) The moon absorbs light from the sun.
Correct answer is option 'C'. Can you explain this answer?
What is the role of the sun in relation to the moon?
a)
The moon produces its own light.
b)
The sun and moon both produce light.
c)
The sun produces light; the moon reflects it.
d)
The moon absorbs light from the sun.
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Nclex Coaching Centre answered |
The sun produces light, which the moon reflects. The moon does not generate its own light; instead, it shines by reflecting sunlight, which is why we see it illuminated at night.
What occurs when light hits a surface and bounces back?- a) Diffraction
- b) Reflection
- c) Refraction
- d) Transmission
Correct answer is option 'B'. Can you explain this answer?
What occurs when light hits a surface and bounces back?
a)
Diffraction
b)
Reflection
c)
Refraction
d)
Transmission
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|
Nclex Coaching Centre answered |
Reflection occurs when light hits a surface and bounces back. This property is what allows us to see objects, as the reflected light reaches our eyes. Mirrors are a common example of materials that exhibit strong reflective properties.
Which of the following is an example of an artificial source of light?- a) Torch
- b) Firefly
- c) Sun
- d) Moon
Correct answer is option 'A'. Can you explain this answer?
Which of the following is an example of an artificial source of light?
a)
Torch
b)
Firefly
c)
Sun
d)
Moon
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|
Nclex Coaching Centre answered |
A torch is an artificial source of light, as it is a man-made device designed to produce light. In contrast, the sun and moon are natural sources of light, with the moon reflecting sunlight rather than generating its own.
Which of the following materials allows light to pass through easily?- a) Wood
- b) Metal
- c) Glass
- d) Cardboard
Correct answer is option 'C'. Can you explain this answer?
Which of the following materials allows light to pass through easily?
a)
Wood
b)
Metal
c)
Glass
d)
Cardboard
|
|
Nclex Coaching Centre answered |
Glass is classified as a transparent material, meaning it allows light to pass through without obstruction. This property makes it useful in applications such as windows and lenses. In contrast, materials like wood and metal are opaque, blocking light entirely.
Which of the following is a property of light?- a) Light travels in straight lines.
- b) Light is always visible.
- c) Light can be absorbed by all materials.
- d) Light travels in circles.
Correct answer is option 'A'. Can you explain this answer?
Which of the following is a property of light?
a)
Light travels in straight lines.
b)
Light is always visible.
c)
Light can be absorbed by all materials.
d)
Light travels in circles.
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|
Nclex Coaching Centre answered |
Light travels in straight lines as rays, which is a fundamental property of light. This characteristic is crucial for understanding concepts such as shadows and reflections, as it explains how light interacts with objects in its path.
What type of material is butter paper classified as?- a) Transparent
- b) Opaque
- c) Reflective
- d) Translucent
Correct answer is option 'D'. Can you explain this answer?
What type of material is butter paper classified as?
a)
Transparent
b)
Opaque
c)
Reflective
d)
Translucent
|
|
Nclex Coaching Centre answered |
Butter paper is classified as a translucent material, meaning it allows some light to pass through but not enough for clear visibility. This property is useful for applications like baking, where some light and heat are needed while still providing a barrier.
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