Which action directly produces sound in most cases? A Heating objects B Melting solids C Vibrating a source D Reflecting
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Chapter 21: Human Eye and the Colourful World (Set-5)
A student reads comfortably at 30 cm, but at 10 cm the letters blur quickly; which eye action fails first
Continue readingChapter 21: Human Eye and the Colourful World (Set-4)
A student shifts focus from a far blackboard to a nearby notebook; which change happens inside the eye to focus
Continue readingChapter 21: Human Eye and the Colourful World (Set-3)
The transparent front part that gives most of the eye’s focusing power is the A Iris B Cornea C Retina
Continue readingChapter 21: Human Eye and the Colourful World (Set-2)
When bright sunlight suddenly falls on your eyes, which immediate change happens to protect the retina? A Pupil shrinks quickly
Continue readingChapter 21: Human Eye and the Colourful World (Set-1)
Which part of the eye is the transparent front covering that first bends incoming light? A Cornea B Retina C
Continue readingChapter 20: Optics – Mirrors, Lenses and Refraction (Set-5)
If angle between incident ray and reflected ray is 120°, the angle of incidence is A 30° B 45° C
Continue readingChapter 20: Optics – Mirrors, Lenses and Refraction (Set-4)
A plane mirror shows a person’s right hand as left due to A Multiple reflection B Refraction effect C Lateral
Continue readingChapter 20: Optics – Mirrors, Lenses and Refraction (Set-3)
When light reflects from a smooth surface, the path follows the law of A Dispersion B Reflection C Diffraction D
Continue readingChapter 20: Optics – Mirrors, Lenses and Refraction (Set-2)
In a ray diagram, the “incident ray” is the ray that A Leaves the mirror B Strikes the surface C
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