Light Test

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Light Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

When all the parallel rays reflected from a plane surface are parallel, the reflection is known as:

A
regular reflection

B
irregular reflection

C
diffused reflection

D
none of these

Solution

When all the parallel rays reflected from a plane surface are parallel, the reflection is known as regular reflection. The regular reflection is the reflection of light rays when they meet (fall on) a smooth (uniform) and glistening surface, where the incident light rays are reflected in one direction, When a beam of parallel light rays is incident on a smooth and plane surface, the reflected rays will also be parallel.
Question 2
1 / -0

The idea of multiple images formed by plane mirrors is used in:

A
a periscope

B
a kaleidoscope

C
a telescope

D
all the above

Solution

The idea of multiple images formed by mirrors, placed at an angle to one another, is used in a kaleidoscope.
As can be seen in picture three mirrors placed at an angle to each other(axial view) are present in kaleidoscope which forms multiple images.
The side view of kaleidoscope is also given .
Question 3
1 / -0

Mark the statement which is true for diffused reflection:

A
Diffused reflection is due to failure of laws of reflection

B
It is caused due to irregularities in the reflecting surface

C
When the incident light is diffused in nature it causes diffused reflection

D
All are true

Solution

Diffused reflection is not due to failure of laws of reflection but it is due to irregularities in the reflecting surface, like that of cardboard.
Question 4
1 / -0

Why we are not able to see our image on a cardboard even though it reflects light?

A
Because cardboard does not shine like mirror

B
Because cardboard is not as durable as mirror

C
Because cardboard's surface is irregular

D
All

Solution

We can"t see our image on a cardboard because cardboard"s surface is rough and the reflection occurring on uneven surface is irregular reflection. So, the rays, after reflection, move to different directions. Images are not formed due to irregular reflections.
Question 5
1 / -0

In 1902, periscope was used in submarine by:

A
Jefferson Simon

B
Charles Simon

C
Simon Lake

D
George Lake

Solution

Periscope was used by Simon Lake in 1902. It is used to make observation beyond obstruction.
Question 6
1 / -0

Periscope works on the principle of:

A
refraction of light

B
reflection of light

C
diffraction of light

D
scattering of light

Solution

As can be seen from the picture of a periscope , a periscope works on the principle of the multiple reflections of light (Light reflects two times by two plane mirrors.)
Question 7
1 / -0

Irregular reflection _______ laws of reflection.

A
obeys

B
violates

C
obeys sometimes

D
violates sometimes

Solution

In physics every type of reflection obeys laws of reflection. Regular , diffused and reflection at spherical surfaces,etc obeys laws of reflection.
Question 8
1 / -0

Which of the following can form image?

A
Diffused reflection

B
Irregular reflection

C
Regular reflection

D
All of these
Question 9
1 / -0

Reflected rays strike the second mirror in periscope at an angle of:

A
$$\displaystyle 45^{ o }$$

B
$$\displaystyle 90^{ o }$$

C
$$\displaystyle 180^{ o }$$

D
$$\displaystyle 60^{ o }$$

Solution

In periscopes, the parallel rays which enter the cylindrical tube from the upper end, from an object, strike the plane mirror at an angle of $$\displaystyle 45^{ o }$$ and hence are reflected through an angle of $$\displaystyle 45^{ o }$$.
These reflected rays strike the second mirror at an angle of $$\displaystyle 45^{ o }$$ and are further reflected through an angle of $$\displaystyle 45^{ o }$$.
Question 10
1 / -0

Periscope is a device related to:

A
tactual aid

B
auditory aid

C
visual aid

D
sensory aid

Solution

Periscope is used in submarines to see objects on the surface of water and in different other cases where observations are to made beyond obstructions. Hence periscope comes under visual aid.

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Re-Attempt Weekly Quiz Competition

Light Test - 17

Result

Light Test - 17

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Rank

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SHARING IS CARING

Question 1

regular reflection

irregular reflection

diffused reflection

none of these

Solution

Question 2

a periscope

a kaleidoscope

a telescope

all the above

Solution

Question 3

Diffused reflection is due to failure of laws of reflection

It is caused due to irregularities in the reflecting surface

When the incident light is diffused in nature it causes diffused reflection

All are true

Solution

Question 4

Because cardboard does not shine like mirror

Because cardboard is not as durable as mirror

Because cardboard's surface is irregular

All

Solution

Question 5

Jefferson Simon

Charles Simon

Simon Lake

George Lake

Solution

Question 6

refraction of light

reflection of light

diffraction of light

scattering of light

Solution

Question 7

obeys

violates

obeys sometimes

violates sometimes

Solution

Question 8

Diffused reflection

Irregular reflection

Regular reflection

All of these

Question 9

$$\displaystyle 45^{ o }$$

$$\displaystyle 90^{ o }$$

$$\displaystyle 180^{ o }$$

$$\displaystyle 60^{ o }$$

Solution

Question 10

tactual aid

auditory aid

visual aid

sensory aid

Solution

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