VSAQ for Chapter 11 Light: Shadows and Reflections Class 7 Science NCERT
Important Questions1
Q1: Name an artificial source of light.
Answer
Electric bulbs.
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2
Q2: What do fireflies use to communicate?
Answer
Fireflies use light to communicate.
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3
Q3:Â What is a luminous object?
Answer
An object that emits its light.
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4
Q4: Does the Moon produce its light?
Answer
No, the Moon reflects sunlight.
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5
Q5: How does light travel under normal conditions?
Answer
Light travels in a straight line.
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6
Q6: Name a natural source of light.
Answer
The Sun.
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7
Q7:Â Give an example of a non-luminous object.
Answer
The Moon.
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8
Q8: Why are LED lamps promoted by the Indian government?
Answer
Because they are energy-efficient, brighter, and environmentally friendly.
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9
Q9:Â What device uses two mirrors to see objects that are not directly visible?
Answer
A periscope.
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10
Q10:Â What is the reflection of light?
Answer
When light bounces off a surface and changes direction.
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11
Q11: What happens when light passes through aligned holes in a straight line?
Answer
It creates a bright spot on a screen.
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12
Q12: What is a transparent material?
Answer
A material that lets light pass through almost completely, like glass.
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13
Q13: What kind of material allows only some light to pass through?
Answer
Translucent material.
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14
Q14: What is formed when an object blocks light?
Answer
A shadow.
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15
Q15: What kind of shadow does an opaque object create?
Answer
A dark and well-defined shadow.
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16
Q16:Â How does a pinhole camera form an image?
Answer
Light passes through a tiny hole and forms an upside-down image on a screen.
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17
Q17: What type of image does a plane mirror form?
Answer
A virtual, upright, same-size, laterally inverted image.
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18
Q18: What is lateral inversion in a mirror image?
Answer
The left side appears as the right side and vice versa.
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19
Q19:Â What causes light pollution?
Answer
Excess artificial light from cities and towns.
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20
Q20: What type of shadow do translucent objects create?
Answer
Lighter and less distinct shadows.
VSAQ