Light Shadows and Reflections Test

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Light Shadows and Reflections Test - 11

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Question 1
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Which of the following is the setup to make a basic pinhole camera ?

A
An enclosed box with a small hole on one of its surface

B
An enclosed box with a small plane mirror on one of its surface

C
An enclosed box with a small concave mirror on one of its surface

D
An enclosed box with a small convex mirror on one of its surface

Solution

A pinhole camera is a simple camera without a lens but with a tiny aperture, a pinhole – effectively a light-proof box with a small hole in one side.
Question 2
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What acts as a pinhole in the naturally formed pinhole images of sun ?

A
The twigs and branches of trees

B
The trunk of leafless trees

C
The gaps between the leaves

D
The shadow of birds sitting on the trees

Solution

The elliptical splashes of sunlight on the ground under a tree is called pinhole images, the source of the light is the sun, the dry porous leaves and the gaps between the leaves acts as the screen, and the phenomenon is known as diffraction of lights.
Question 3
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Reflection is

A
Bending of ray of light.

B
Bouncing back of ray of light.

C
Light travelling in a straight line.

D
None of these.

Solution

Reflection is bouncing back of ray of light by a surface.
Question 4
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Select the correct alternative:
The property due to which a light ray striking a surface and returned back into the same medium is called

A
refraction

B
reflex action

C
reflection

D
regression

Solution

The property due to which a light ray striking a surface and returned back into the same medium is called reflection.
Question 5
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Butter paper is an example for ........ objects.

A
A transparent

B
A translucent

C
An opaque

D
A luminous

Solution

Butter paper is an example for a translucent object.
Question 6
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Light travels in ........ lines.

A
Straight

B
zig zag

C
circular

D
parabolic

Solution

Light travels in a straight line. Unless encountered with continious changing refractive index object.
Question 7
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Air is not visible because it:

A
is nearly a perfectly transparent substance

B
neither absorbs nor reflects light

C
transmits whole of light

D
follows all of the above

Solution

Air is not visible because it neither absorbs nor reflects light, it transmits whole of light. Dust particles in air is visible as they reflect light. Air is an almost perfect transparent substance.
Question 8
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Shadows are formed because:

A
Opaque bodies allow the light to pass through them

B
Light can bend around the opaque bodies

C
Light rays cannot pass through the opaque bodies

D
Light shows the phenomenon of diffraction around large objects

Solution

Shadows are formed because light travels in straight lines. When an opaque object or material is placed in the path of the rays of light, the object blocks the light to pass through it, forming its shadow.
Question 9
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Transparent objects:

A
Do not allow light to pass through them

B
Allow light to pass through them

C
Allow light to pass through them partially

D
None of these

Solution

Transparent objects allow light to pass through them and we can see through these objects clearly. For example, glass.
Question 10
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Translucent objects possess following quality :

A
Do not allow light to pass through them

B
Allow light to pass through them

C
Allow only a partial amount of light to pass through them

D
Absorb all the light incident on them

Solution

Translucent objects allow transmitting and diffusing light so that objects beyond cannot be seen clearly that is they allow only a partial amount of light to pass through them.

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Re-Attempt Weekly Quiz Competition

Light Shadows and Reflections Test - 11

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Light Shadows and Reflections Test - 11

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SHARING IS CARING

Question 1

An enclosed box with a small hole on one of its surface

An enclosed box with a small plane mirror on one of its surface

An enclosed box with a small concave mirror on one of its surface

An enclosed box with a small convex mirror on one of its surface

Solution

Question 2

The twigs and branches of trees

The trunk of leafless trees

The gaps between the leaves

The shadow of birds sitting on the trees

Solution

Question 3

Bending of ray of light.

Bouncing back of ray of light.

Light travelling in a straight line.

None of these.

Solution

Question 4

refraction

reflex action

reflection

regression

Solution

Question 5

A transparent

A translucent

An opaque

A luminous

Solution

Question 6

Straight

zig zag

circular

parabolic

Solution

Question 7

is nearly a perfectly transparent substance

neither absorbs nor reflects light

transmits whole of light

follows all of the above

Solution

Question 8

Opaque bodies allow the light to pass through them

Light can bend around the opaque bodies

Light rays cannot pass through the opaque bodies

Light shows the phenomenon of diffraction around large objects

Solution

Question 9

Do not allow light to pass through them

Allow light to pass through them

Allow light to pass through them partially

None of these

Solution

Question 10

Do not allow light to pass through them

Allow light to pass through them

Allow only a partial amount of light to pass through them

Absorb all the light incident on them

Solution

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