Light Test

Result

Light Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The surface in the figure (b) is most likely:

A
A mirror

B
A sheet of paper

C
A waxed paper

D
A glass pane

Solution

In figure (b), we see a diffused reflection. It is the reflection of light such that all the parallel rays reflected from the rough or irregular surface are not parallel. The diffused reflection is not due to the failure of the laws of reflection but it is caused by the irregularities in the reflecting surface, like that of a sheet of paper. All the other surfaces are relatively smoother.

So the answer is option B.
Question 2
1 / -0

Motion pictures or cinematography make use of :

A
Least distance of distinct vision

B
Persistence of vision

C
Power of accommodation

D
None of these

Solution

Persistence of vision is the phenomenon when eye and brain hold on to a series of images to form a single complete picture.
It refers to the optical illusion whereby multiple discrete images blend into a single image in the human mind and believed to be the explanation for motion perception in cinema and animated films.
Hence Motion pictures or cinematography make use of persistence of vision.
Question 3
1 / -0

The screen behind the eye lens is called :

A
Iris

B
Ciliary muscle

C
Retina

D
Pupil

Solution

In human eyes, Retina works as a screen where real and inverted image formed after refraction of incoming light from an object.
Question 4
1 / -0

A beam of light is made up of:

A
bundles of rays

B
millions of droplets

C
clusters

D
none of these

Solution

A beam of light is made up of bundles of closely spaced parallel rays.
Question 5
1 / -0

Which of the following can actually affect the visibility of an object?

A
The shape of the object

B
Availability of light

C
The size of the object

D
All the above

Solution

Light makes an object visible by getting reflected from the object and falling on the observer's eyes. Light conditions can actually affect the visibility of an object. The visibility of an object has nothing to do with its shape and size.
Question 6
1 / -0

Select the odd one out with respect to the type of reflection of incident light -
wood, steel, silver, mirror

A
mirror

B
wood

C
silver

D
steel

Solution

Except wood all other causes regular reflection.
Question 7
1 / -0

A perpendicular drawn at the point of incidence of a light ray on the surface of a mirror is called -

A
incident ray

B
reflected ray

C
normal

D
none of these

Solution

Normal is perpendicular drawn to the surface at the point of incidence so that angle between incident ray and normal is angle of incidence.
Question 8
1 / -0

The splitting of white light into several colours on passing through a glass prism is due to

A
Refraction

B
Reflection

C
Dispersion

D
None of these

Solution

$$ \bf{Refraction} $$ of light is the phenomenon of bending of light or change in the direction of light when it passes obliquely from one transparent medium to another.

$$ \bf{Reflection} $$ is the phenomenon in which light rays striking a polished surface (such as a mirror) bounce back or are sent back into the same medium.

$$\bf{Dispersion} $$ is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.

Hence, the correct answer is OPTION C.
Question 9
1 / -0

Moon does not emit light yet it is visible. Choose the most appropriate reason behind it :

A
At night the moon starts emitting light because the moon is covered by sun at night

B
Moon is visible due to the light falling on it

C
Both are true

D
None is true

Solution

Moon is a nonluminous body. It is visible due to the light falling on it. It reflects the sunlight.
Question 10
1 / -0

The light ray which strikes any polished surface at some angle is called:

A
reflected ray

B
incident ray

C
normal ray

D
none of these

Solution

The ray of light which falls on a polished smooth surface at some angle other than 90 degree is called incident ray of light.

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Re-Attempt Weekly Quiz Competition

Light Test - 14

Result

Light Test - 14

Score

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Rank

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SHARING IS CARING

Question 1

A mirror

A sheet of paper

A waxed paper

A glass pane

Solution

Question 2

Least distance of distinct vision

Persistence of vision

Power of accommodation

None of these

Solution

Question 3

Iris

Ciliary muscle

Retina

Pupil

Solution

Question 4

bundles of rays

millions of droplets

clusters

none of these

Solution

Question 5

The shape of the object

Availability of light

The size of the object

All the above

Solution

Question 6

mirror

wood

silver

steel

Solution

Question 7

incident ray

reflected ray

normal

none of these

Solution

Question 8

Refraction

Reflection

Dispersion

None of these

Solution

Question 9

At night the moon starts emitting light because the moon is covered by sun at night

Moon is visible due to the light falling on it

Both are true

None is true

Solution

Question 10

reflected ray

incident ray

normal ray

none of these

Solution

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