Light Shadows and Reflections Test

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Light Shadows and Reflections Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Nature of the shadow depends on :

A
The relative distance between the source of light and the object

B
The relative size of the source of light and the object

C
The angle between the source of light and the object

D
All of the above

Solution

The nature of the shadow depends on the relative distance, the angle between the source of light and the object, and the relative size of the source of light and the object.
Question 2
1 / -0

The phenomenon of rebounding and change in direction of light when it strikes the surface of a mirror is called ____________.

A
Refraction

B
Diffraction

C
Reflection

D
None of these

Solution

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
Question 3
1 / -0

What is the angle of incidence if a ray is reflected by a plane mirror back along its original path?

A
$$0^{\circ}$$

B
$$90^{\circ}$$

C
$$45^{\circ}$$

D
$$30^{\circ}$$

Solution

If an incident light ray is reflected back along its original path by a plane mirror,then it means that the ray was incident normally on the plane mirror.And then its angle of incidence will be 0 degrees. Because the angle of incidence is the angle that an incident line or ray makes with perpendicular to the surface at the point of incidence.Here the incident ray is along the normal (perpendicular to mirror) so angle between incident ray and normal is zero.
Question 4
1 / -0

Which fact can be established by a pinhole camera?

A
Light travels in straight lines

B
Images are always inverted

C
Image gets inverted when the light travels through a hole

D
No specific conclusion

Solution

In a pinhole camera, light travels in a straight line and forms an image.
Question 5
1 / -0

The shadow below a tree has bright spots in it because :

A
the light comes through circular gaps

B
the light bends around the leaves to form circular spots

C
the gaps between the leaves act as the pin holes

D
the leaves are circular

Solution

If the light is blocked by an obstacle, let us say it's a tree, then the part of the light that goes around the tree will act as a source of its own light which then tend to fill the space behind the tree. So you see the shadow from the other side of the tree even though the light source leaves you in shadow.
Question 6
1 / -0

The length of the shadow will be shortest when

A
The angle between the source of light and the object is 45

B
The source of light and the object are parallel to each other

C
The source of light and the object are perpendicular to each other

D
The angle between the source of light and the object is 60

Solution

When the light rays are parallel to the object there would be no obstruction in the path of light, so ideally there will be no shadow formed.
Thus option B is correct.
Question 7
1 / -0

The shadow below a tree has bright spots in it because:

A
The light comes through circular gaps

B
The light bends around the leaves to form circular spots

C
The gaps between the leaves act as the pin holes

D
The leaves are circular

Solution

Light passes through the gaps present in between the leaves and produces bright spots.
Question 8
1 / -0

Which of the following type of bodies form sharp shadows when placed in the path of light?

A
Transparent

B
Translucent

C
Transparent and translucent

D
Opaque

Solution

Transport bodies allow light to pass through it while translucent bodies allow light partially through it but opaque bodies do not allow light to pass through it, so they form sharp shadows when placed in the path of light.
Option (D) is correct.
Question 9
1 / -0

Which of the following is a translucent?

A
Silver

B
Iron

C
Wood

D
Ground glass

Solution
Question 10
1 / -0

The colour of shadow formed by red light is:

A
Grey

B
Blue

C
Black

D
Green

E
Red

Solution

The shadow is the place where the light doesn't go. So it doesn't matter what color the light is where it does go, and the shadow is usually described as "black"

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Re-Attempt Weekly Quiz Competition

Light Shadows and Reflections Test - 13

Result

Light Shadows and Reflections Test - 13

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SHARING IS CARING

Question 1

The relative distance between the source of light and the object

The relative size of the source of light and the object

The angle between the source of light and the object

All of the above

Solution

Question 2

Refraction

Diffraction

Reflection

None of these

Solution

Question 3

$$0^{\circ}$$

$$90^{\circ}$$

$$45^{\circ}$$

$$30^{\circ}$$

Solution

Question 4

Light travels in straight lines

Images are always inverted

Image gets inverted when the light travels through a hole

No specific conclusion

Solution

Question 5

the light comes through circular gaps

the light bends around the leaves to form circular spots

the gaps between the leaves act as the pin holes

the leaves are circular

Solution

Question 6

The angle between the source of light and the object is 45

The source of light and the object are parallel to each other

The source of light and the object are perpendicular to each other

The angle between the source of light and the object is 60

Solution

Question 7

The light comes through circular gaps

The light bends around the leaves to form circular spots

The gaps between the leaves act as the pin holes

The leaves are circular

Solution

Question 8

Transparent

Translucent

Transparent and translucent

Opaque

Solution

Question 9

Silver

Iron

Wood

Ground glass

Solution

Question 10

Grey

Blue

Black

Green

Red

Solution

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