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Published on: 05/12/2020
10th Standard Science Optics English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
The phenomena of light responsible for the working of the human eye is
Reflection
Refraction
Power
Accommodation
2.
An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is _______ cm.
50
16.66
6.66
10
3.
Convex lens forms a highly diminished, real and inverted image, when an object is at
infinity
F
below F & c
beyond 2 F
4.
The point at which the principal axis meets the surface of the lens is
centre of curvature
radius of curvature
focus
pole
5.
According to snell's law
\(\mu=\frac{\sin i}{\sin r}\)
μ =\(\frac { { c }_{ a } }{ { c }_{ m } } \)
\(\mu=\frac{\sin r}{\sin i}\)
μ=\(\frac { { c }_{ m } }{ { c }_{ a } } \)
6.
In spherical lenses, all distance are measured from
optic centre
principal focus
principal axis
centre of curvature
7.
The scattering of light by colloidal particles is _____ scattering.
Ray light
Mie
Raman
Tyndall
8.
Rainbow formation is due to _____ water droplets.
Ionisation
absorption of sunlight
reflection and refraction of sunlight
reflection of sunlight
9.
When a ray of light travels from one medium to another, it bends. This phenomenon is called.
reflection
dispersion
refraction
interference
10.
11.
Velocity and wavelength of light are related by a relation
g-c⋋
\(\gamma =\frac { c }{ \lambda } \)
c=\(\gamma \)⋋
both b & c
12.
The group of rays is ______
lines
dots
beam
none of these
13.
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
A convex lens of focal length 5 cm
A concave lens of focal length 5 cm
A convex lens of focal length 10 cm
A concave lens of focal length 10 cm
14.
Power of a lens is –4D, then its focal length is
4m
–40m
–0.25 m
–2.5 m
15.
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
a convergent beam of light
a divergent beam of light
a parallel beam of light
a coloured beam of light
1.
(b)
Refraction
2.
(b)
16.66
3.
(a)
infinity
4.
(d)
pole
5.
(a)
\(\mu=\frac{\sin i}{\sin r}\)
6.
(a)
optic centre
7.
(d)
Tyndall
8.
(c)
reflection and refraction of sunlight
9.
(c)
refraction
10.
(c)
11.
(d)
both b & c
12.
(c)
beam
13.
(a)
A convex lens of focal length 5 cm
14.
(c)
–0.25 m
15.
(c)
a parallel beam of light
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
