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Class 7 Science Chapter 13 Question Answers - Light

Very Short Q & A :


Q1: Give an example to show that the path of light is always straight and never curved.

Ans: Light emitted by torchlight and light emitted from the headlights of a vehicle


Q2: The bouncing of light by any smooth surface, like a mirror, is called__________________.

Ans: Reflection of light.


Q3: What is the image of an object?

Ans: Due to the reflection of light, the impression of an object formed in a mirror is called the image of the object.


Q4: As the distance of the object from the mirror increases, the distance of the image also increases. True/ False.

Ans: True


Q5: Placing a mirror near lights, and table lamps reflect the light over a larger area and make the room appear brighter. True/ False.

Ans: True.


Q6: Images that cannot be captured on a screen are called __________________.

Ans: Virtual images.


Q7: Ravi is looking in a mirror; his right hand will appear to be at ____________ in its image in the mirror.

Ans: Left side


Q8: Why the word ‘AMBULANCE’ is painted left-right inversed on the vehicle?

Ans: So that when the driver of a vehicle in front looks into his rear - view mirror, can read ambulance written on it quickly and give way to it.


Q9: The image formed by a plane mirror is

  1. The same size as that of the object
  2. Left-right inversed
  3. Erect and virtual
  4. All of the above

Ans: (4) All of the above.


Q10: State the principle used in creating a mirror image.

Ans: Principle of reflection


Q11: Name the mirror having a curved reflecting surface.

Ans: Spherical mirror


Q12: Name the two types of spherical mirror.

Ans: Concave mirror and convex mirror.


Q13: State uses of the concave mirror.

Ans: Concave mirrors are used by dentists to obtain a magnified image of the teeth. They are also used in solar heaters or solar concentrators, and as reflectors in flashlights, and headlights of cars and scooters.


Q14: State uses of the convex mirror.

Ans: Convex mirror are used as reflectors at sharp turns and tricky or ‘blind’ corners and in parking lots, and as rear-view mirrors in cars and on motorcycles.


Q15: What is a virtual image?

Ans: The image formed by a plane mirror cannot be captured on a screen, and is called a virtual image.


Q16: What is a real image?

Ans: Images that can be captured on a screen are known as real images.


Q17: Give an example of a real image.

Ans: In a camera, images are real and can be captured on the negative, which acts as a screen.


Q18: In an opaque spherical surface, the silvered surface acts as a mirror. True/ False.

Ans: True


Q19: What happens when light rays are incident on a concave lens?

Ans: When light rays are incident on a concave lens, they bend outwards or diverge.


Q20: What is the name for the concave lens?

Ans: Diverging lens


Q21: What kind of image is formed by the concave lens?

Ans: Upright, virtual and smaller than the object.


Q22: Name an object made from the concave lens.

Ans : Peep holes contain concave lenses.


Q23: A convex lens converges light rays. Therefore, it is also called a ___________________.

Ans: Converging lens


Q24: What kind of image is formed by the convex lens?

Ans: Virtual, erect and magnified.


Q25: State various applications of lenses.

Ans: Lenses are used in magnifying glasses, peepholes, cameras, bioscopes, binoculars, telescopes, microscopes, and projectors.


Q26: A refracting telescope uses a:

  1. Concave mirror
  2. convex lens
  3. Convex mirror
  4. Both a and c

Ans: (4) Both 1 and 2.


Q27: How is rainbow formed in the sky?

Ans: A rainbow is formed by the refraction and reflection of the sun’s rays through raindrops.


Q28: When does rainbow appear in the sky?

Ans: When it is raining in one part of the sky and sunny in another, a rainbow appears.


Q29: Although sunlight appears white, it is composed of _________________colours.

Ans: Seven


Q30: The colors in a rainbow are not the colors of sunlight. True/ False.

Ans: False.


Q31: An image formed by a______________mirror is always of the same size as that of the object.

Ans: Plane


Q32: A concave mirror always forms a real image. True/ False.

Ans: False


Q33: Which type of lens forms always a virtual image?

Ans: A concave lens always forms a virtual, erect and smaller image than the object.


Q34: What is the focal length of a plane mirror?

Ans: Infinite


Q35: State the relation between the radius of curvature and focal length of spherical mirrors.

Ans : 

Radius of curvature = 2 * focal length.

R = 2f.


Q36: Out of convex mirror and the concave mirror, whose focus is situated behind the mirror?

Ans: The focus of convex mirror is situated behind it.

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FAQs on Class 7 Science Chapter 13 Question Answers - Light

1. What is light?
Ans. Light is a form of electromagnetic radiation that is visible to the human eye. It is made up of tiny particles called photons, which travel in waves and carry energy.
2. How does light travel?
Ans. Light travels in straight lines at a speed of approximately 299,792 kilometers per second (186,282 miles per second). It can travel through a vacuum, such as outer space, as well as through transparent substances like air, water, and glass.
3. What are the sources of light?
Ans. The primary sources of light are natural sources, such as the Sun, stars, and fire. Artificial sources of light include light bulbs, lamps, candles, and LED lights.
4. How does light interact with objects?
Ans. When light encounters an object, it can be absorbed, transmitted, or reflected. The color of an object is determined by the wavelengths of light that it reflects. For example, a red apple appears red because it reflects red light and absorbs other colors.
5. What are the properties of light?
Ans. Light has several properties, including reflection, refraction, dispersion, and polarization. Reflection occurs when light bounces off a surface, while refraction is the bending of light as it passes from one medium to another. Dispersion refers to the splitting of white light into its component colors, and polarization refers to the alignment of light waves in a specific direction.
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