The path of light is ______

(a)

rays

(b)

point

(c)

lines

(d)

beam

The group of rays is ______

(a)

lines

(b)

dots

(c)

beam

(d)

none of these

The velocity of light is _______

(a)

3 x 10^-8 ms^-1

(b)

3 x 10⁸  ms^-1

(c)

3 x 10⁸ km s^-1

(d)

3 x 10^-8 km s^-1

Velocity and wavelength of light are related by a relation

(a)

g-c⋋

(b)

\(\gamma =\frac { c }{ \lambda } \)

(c)

c=\(\gamma \)⋋

(d)

both b & c

Violet and red light ______ wavelengths.

(a)

lowest, highest

(b)

highest, lowest

(c)

same

(d)

standard

We can see objects because of

(a)

reflection

(b)

refraction

(c)

transmission

(d)

diffraction

_____ determines speed of light in a medium.

(a)

thickness

(b)

wavelength

(c)

refractive index

(d)

both b and c

When light travels from rarer to denser medium, the refracted ray is ______  the normal.

(a)

bent away

(b)

along

(c)

bent towards

(d)

just grazes the surface of separation

For air, the refractive index is

(a)

1

(b)

infinity

(c)

0

(d)

1

When a ray of light travels from one medium to another, it bends. This phenomenon is called.

(a)

reflection

(b)

dispersion

(c)

refraction

(d)

interference

The splitting up of white light into colours is called

(a)

reflection

(b)

refraction

(c)

scattering

(d)

dispersion

On a rainy day, small oily films on water show brilliant colours. This is due to

(a)

scattering

(b)

dispersion

(c)

reflection

(d)

refraction

Rainbow formation is due to _____ water droplets.

(a)

Ionisation

(b)

absorption of sunlight

(c)

reflection and refraction of sunlight

(d)

reflection of sunlight

Red light is used in traffic signals because

(a)

It has highest wavelength

(b)

disperses least

(c)

red is symbol of danger

(d)

both a & b

A star appears twinkling in the sky because of ______ by the atmosphere.

(a)

scattering of light

(b)

reflection of light

(c)

refraction of light

(d)

both a and b