Optics Additional One Mark Online Test

Optics Additional One Mark Online Test (10th Standard Science)

Pick how many questions you want and set a time limit, then start. You'll get your score at the end with the correct answer and an explanation for every question. Free, in Tamil and English — 15 questions available.

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When a ray of light passes from a medium of refractive index 1.5 into a medium of refractive index 1.3, how does its speed and direction change?

A.Its speed decreases and it bends towards the normal B.Its speed increases and it bends away from the normal C.Its speed decreases and it bends away from the normal D.Its speed increases and it bends towards the normal

According to Rayleigh's scattering law, if the wavelength of light is reduced to half of its original value, by what factor will the amount of scattering change?

A.It will decrease to 1/16 of its original value B.It will increase by a factor of 4 C.It will increase by a factor of 16 D.It will decrease to 1/4 of its original value

Which type of scattering is primarily responsible for the white appearance of clouds when sunlight falls on water droplets?

A.Rayleigh scattering B.Mie scattering C.Tyndall scattering D.Raman scattering

In Raman scattering, the scattered light contains additional spectral lines of frequencies other than the incident frequency. This phenomenon is observed when monochromatic light passes through which of the following?

A.Only gases B.Only liquids C.Only transparent solids D.Gases, liquids, or transparent solids

According to the Cartesian sign convention, which of the following distances is always taken as negative for spherical lenses?

A.Focal length of a convex lens B.Distance of the object from the lens C.Distance of a real image formed behind the lens D.Height of an erect object placed above the principal axis

If the magnification produced by a spherical lens is -0.5, what is the nature and size of the image formed?

A.Real, inverted and enlarged B.Real, inverted and diminished C.Virtual, erect and enlarged D.Virtual, erect and diminished

Which part of the human eye acts as the main refracting surface where most of the refraction of entering light occurs?

A.Iris B.Pupil C.Cornea D.Retina

The power of accommodation of the human eye is achieved by changing the focal length of the eye lens. This is done with the help of which of the following?

A.Optic nerves B.Ciliary muscles C.Iris muscles D.Sclera

What is the maximum time interval between two consecutive light pulses below which the human eye cannot distinguish them separately?

A.1/10 second B.1/16 second C.1/25 second D.1/50 second

Q10

A person suffering from myopia can see objects clearly only up to a distance of 5 meters. To see distant objects at infinity, what should be the focal length of the correcting lens?

A.+5 meters B.-5 meters C.-2.5 meters D.+2.5 meters

Q11

An eye defect where a person cannot see parallel and horizontal lines clearly is called astigmatism. This defect can be corrected by using which type of lens?

A.Bifocal lenses B.Cylindrical lenses C.Convex lenses D.Concave lenses

Q12

A simple microscope consists of which of the following optical components?

A.A concave lens of short focal length B.A convex lens of short focal length C.A concave lens of long focal length D.A convex lens of long focal length

Q13

In a compound microscope, how do the focal lengths of the objective lens and the eye lens compare?

A.Objective lens has larger focal length, eye lens has shorter focal length B.Objective lens has shorter focal length, eye lens has larger focal length C.Both lenses have equal and short focal lengths D.Both lenses have equal and long focal lengths

Q14

If a lens has a focal length of -25 centimeters, what is its power?

A.+4 D B.-4 D C.+0.04 D D.-0.04 D

Q15

When white light is refracted through a glass prism, why does a spectrum form?

A.Because different colored lights travel with the same velocity in glass B.Because the refractive index of glass is different for different wavelengths C.Because red light has the highest angle of refraction and violet has the smallest D.Because the prism reflects only certain colors of the white light

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About this Optics test

This free online practice test covers Optics from the 10th Standard Science (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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