Light Shadows and Reflections Test

Result

Light Shadows and Reflections Test - 17

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Question 1
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In the pinhole camera, the light rays from the source are moving through the pinhole and incident on the white screen. This is due to :

A
the property of light called "rectilinear propagation of light"

B
the property of light called "interference of light"

C
the property of light called "diffraction"

D
the property of light called "dispersion"

Solution

In a pinhole camera, the light rays pass through the small hole of the camera and incident on the white screen, kept on the other side of the source. This is possible because light travels in a straight line, which is known as the rectilinear propagation of light.
Question 2
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Directions For Questions

A torch is shone on the four sticks of the same length as shown below.

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Which stick is likely to form the $$SHORTEST$$ shadow on the ground?

A
$$A$$

B
$$B$$

C
$$C$$

D
$$D$$

Solution

The shadow is formed when light falls at an angle to the stick and it is clear that light falling is completely parallel to stick $$B$$ so stick B will form almost no shadow on ground.
Question 3
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Which surface will reflect most of the light falling on them ?

A
Rough surface

B
Shining surface

C
Smooth surface

D
Opaque surface

Solution
Question 4
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Which of the following can never form a circular shadow?

A
A ball

B
A flat disc

C
A shoe box

D
An ice cream cone

Solution

The correct answer is option (c) A shoe box. A shoe box is either square or rectangular shaped.
Question 5
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The phenomenon related to the reflection of light is

A
Image of the sun visible on the surface of water

B
Reddish colour of the sky during evening

C
Sun is visible two minutes before the actual sun rise.

D
Green house effect caused by the radiation of the sun

Solution

Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection, and image of sun becomes visible on the surface of water.
Question 6
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A student observes a tree given in Fig. through a pinhole camera. Which of the diagrams given in Fig. (a) to (d) depicts the image seen by her correctly?

A

B

C

D

Solution

The correct answer is option (b). The image will be inverted and left - right reversed. Therefore, the option (b) is correct.
Question 7
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Which of the following is/are not always necessary to observe a shadow?

A
Sun

B
Screen

C
Source of light

D
Opaque object

Solution

The correct answer is option (a) Sun. Shadow can be formed from other sources of light also, like, torch.
Question 8
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If we are able to see anything clearly through an object, then such an object is said to be a ________ object

A
Transparent

B
Translucent

C
Opaque

D
None of these

Solution

If we are able to see anything clearly through an object, then such an object is said to be a transparent object.
Translucent objects allow some light to travel through them. Materials like frosted glass and some plastics are called translucent. When light strikes translucent materials, only some of the light passes through them. The light does not pass directly through the materials.
An opaque object is something that allows no light through it. Concrete, wood, and metal are some examples of opaque materials. Some materials can be opaque to light, but not to other types of electromagnetic waves.
Question 9
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Assertion: Shadow forms when light falls on a wooden block.
Reason: Wood is an example of an opaque object.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

C
Assertion is true but Reason is false

D
Assertion is false but Reason is true

Solution

Shadow forms when light falls on a wooden block because wood is an example of an opaque object. Opaque objects do not allow light to pass through them. Shadows are formed when an opaque object comes in the path of light.
Question 10
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A man of height h walking away from a lamp post finds his shadow to be equal to his height when he is at a distance x from the lamp post. If the height of the lamp post is H, then x is

A
H + h

B
H - h

C
H.h

D
H/h