Chapter 15- Light Class 7 science- Question and Answer (True or False)

Chapter 15- Light -Question and Answer (True Or False) – Solved Worksheet with Explanation

Question- The reflected ray travels towards the reflecting surface.

Answer- False

Explanation- The reflected ray is the beam of light that bounces off the reflecting surface and travels away from it.

Question- The normal line is drawn parallel to the reflecting surface.

Answer- False

Explanation- The normal is an imaginary line drawn perpendicular to the reflecting surface at the point of incidence.

Also Check Class 7 Science -Chapter 15 – Light- Complete Notes

Question- The laws of reflection apply only to smooth surfaces.

Answer- False

Explanation- The laws of reflection apply to both smooth and rough surfaces, though the quality of the reflected ray differs.

Question- A real image can be obtained on a screen.

Answer- True

Explanation- Real images are formed by the actual convergence of light rays and can be projected onto a screen, such as in cinema.

Question- The image formed in a plane mirror is laterally inverted.

Answer- True

Explanation- Lateral inversion in a plane mirror causes the right side of the object to appear as the left side in the image and vice versa.

Question- A concave mirror forms a virtual image when the object is far from the mirror.

Answer- False

Explanation- A concave mirror forms a virtual image when the object is very close to the mirror, not far.

Question- White light consists of three primary colours.

Answer- False

Explanation- White light is composed of seven different colours, as demonstrated by Newton through dispersion using a prism.

Question- In a rainbow, the colour violet appears on the outer part of the arc.

Answer- False

Explanation- In a rainbow, red appears on the outer part of the arc, while violet is on the inner part.

Question- Convex mirrors are used in vehicle mirrors because they provide a narrowed field of view.

Answer- False

Explanation- Convex mirrors are used in vehicle mirrors because they offer a wider field of view, aiding in driving safety.

Question- Regular reflection leads to the formation of clear and well-defined images.

Answer- True

Explanation- Regular reflection, characteristic of smooth surfaces, results in light rays being reflected back uniformly, forming clear and well-defined images.

Question- Light can only travel in curved paths.

Answer- False

Explanation- Light travels in a straight line, as demonstrated by the experiment involving a straight and a bent pipe.

Question- Butter paper is an example of a transparent object.

Answer- False

Explanation- Butter paper is translucent, not transparent, as it allows some, but not all, light to pass through.

Question- Shiny surfaces are generally poor reflectors of light.

Answer- False

Explanation- Shiny surfaces, like mirrors, are good reflectors. They reflect light efficiently, making them act as reflectors.

Question- A curved mirror can be either concave or convex.

Answer- True

Explanation- Curved mirrors can bulge inwards (concave) or outwards (convex), affecting the reflection of light and the nature of the image formed.

Question- In reflection, light is always absorbed and never thrown back.

Answer- False

Explanation- In reflection, light is thrown back from the surface it encounters, rather than being absorbed.

Question- Concave mirrors are used in headlights of vehicles to disperse light.

Answer- False

Explanation- Concave mirrors are used in vehicle headlights to focus and direct light into a strong, straight beam, not to disperse it.

Question- Convex lenses are thicker at the edges than at the centre.

Answer- False

Explanation- Convex lenses are thicker in the centre and narrower at the edges, opposite to concave lenses.

Question- Lateral inversion results in the top of an object appearing as the bottom in its image in a plane mirror.

Answer- False

Explanation- Lateral inversion causes the sides of an object to be reversed (right becomes left and vice versa) in a plane mirror, not the top and bottom.

Question- In concave lenses, light rays diverge after passing through the lens.

Answer- True

Explanation- Concave lenses cause light rays to diverge, or spread out, which is why they are used in peepholes and for correcting nearsightedness.

Question- A plane mirror must be as tall as the observer to reflect the entire image.

Answer- False

Explanation- A plane mirror only needs to be half the height of the observer to reflect their entire image because the image is the same size as the object and located at the same perceived distance behind the mirror.