Class 7 Science Chapter 11 Very Short Question Answers

Q1: Name an artificial source of light.
Ans: Electric bulbs. Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Q2: What do fireflies use to communicate?
Ans: Fireflies use light to communicate.

Q3: What is a luminous object?
Ans: An object that emits its light. Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Q4: Does the Moon produce its light?
Ans: No, the Moon reflects sunlight.

Q5: How does light travel under normal conditions?
Ans: Light travels in a straight line.

Q6: Name a natural source of light.
Ans: The Sun.

Q7: Give an example of a non-luminous object.
Ans: The Moon.

Q8: Why are LED lamps promoted by the Indian government?
Ans: Because they are energy-efficient, brighter, and environmentally friendly.

Q9: What device uses two mirrors to see objects that are not directly visible?
Ans: A periscope. Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Q10: What is the reflection of light?
Ans: When light bounces off a surface and changes direction.

Q11: What happens when light passes through aligned holes in a straight line?
Ans: It creates a bright spot on a screen.

Q12: What is a transparent material?
Ans: A material that lets light pass through almost completely, like glass. Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Q13: What kind of material allows only some light to pass through?
Ans: Translucent material.

Q14: What is formed when an object blocks light?
Ans: A shadow.

Q15: What kind of shadow does an opaque object create?
Ans: A dark and well-defined shadow. Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Q16: How does a pinhole camera form an image?
Ans: Light passes through a tiny hole and forms an upside-down image on a screen.

Q17: What type of image does a plane mirror form?
Ans: A virtual, upright, same-size, laterally inverted image.

Q18: What is lateral inversion in a mirror image?
Ans: The left side appears as the right side and vice versa. Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Q19: What causes light pollution?
Ans: Excess artificial light from cities and towns.

Q20: What type of shadow do translucent objects create?
Ans: Lighter and less distinct shadows.

FAQs on Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

	Science (Curiosity) Class 7 - New NCERT 80 videos\|224 docs\|12 tests

1. What are shadows and how do they form?

Ans. Shadows are dark areas created when an opaque object blocks light from a source. When light travels in straight lines and encounters an object, it cannot pass through, resulting in a shadow on the surface behind the object.

2. What factors affect the size and shape of a shadow?

Ans. The size and shape of a shadow depend on the position of the light source, the distance between the object and the surface where the shadow falls, and the shape of the object itself. For example, shadows are longer when the light source is low and shorter when it is overhead.

3. How do reflections occur?

Ans. Reflections occur when light bounces off a smooth surface, such as a mirror or still water. The angle at which the light hits the surface (incident angle) is equal to the angle at which it reflects away (reflected angle), creating a clear image of whatever is in front of the reflective surface.

4. Why do we see different colors in reflections?

Ans. The colors seen in reflections are due to the properties of the surface and the light that illuminates it. Different surfaces can absorb or reflect different wavelengths of light, which gives the reflected image its color. For instance, a red object will reflect red light and absorb other colors.

5. How can we use shadows and reflections in everyday life?

Ans. Shadows and reflections can be used in various ways, such as in art to create depth, in architecture to enhance lighting, and in science to study light behavior. Additionally, they can help us understand the position of the sun and time of day by observing the length and direction of shadows.

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Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Science (Curiosity) Class 7 - New NCERT

FAQs on Class 7 Science Chapter 11 Very Short Question Answers - Light: Shadows and Reflections

Science (Curiosity) Class 7 - New NCERT

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