Light Test

Result

Light Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not an example of dispersion of light?

A
Rainbow

B
Colors appearing on the surface of CDs

C
Colorful display of LED television screen

D
Colors appearing on the surface of a soap bubble

Solution

Common examples of dispersion of light is rainbow, colors appearing on the surfaces of Compact Discs and soap bubbles.
LED TV however have colorful Light emitting diode display.
Question 2
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The image represents white light getting split into seven constituent colors after passing through a prism. Pick the correct option.

A
1: Violet
5: Yellow
7: Red

B
1: Red
5: Blue
7: Violet

C
1: Violet
5: Green
7: Red

D
1: Red
5: Green
7: Violet

Solution

When sunlight passes through a prism it splits into its seven constituent colors as shown in the image.
The order of the colors from the top is:
1: Red
2: Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet
Question 3
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How many images of an object in a room will be formed if two mirrors are fitted on adjacent walls and one mirror on the roof of the room?

A
2

B
5

C
7

D
10

Solution

Three images are formed when two plane mirrors are perpendicular to each other, namely $$I_1, I_2$$ and $$I_3$$.
If the ceiling has mirror, then it will form images of these 3 images, namely $$I_1', I_2'$$ and $$I_3'$$. One image will be of the object itself.

Therefore, total number of images $$=3+3+1=7$$

So $$7$$ is the answer. Option $$(C)$$ is correct.
Question 4
1 / -0

Sunlight that bounces off a surface is said to be __________ from the surface.

A
Radiated

B
Absorbed

C
Emitted

D
Reflected

Solution
Question 5
1 / -0

Which of the following is not true about sunlight?

A
Sunlight is white light

B
Sunlight has seven constituent colors

C
Sunlight cannot be split with a prism made of water

D
All of the above

Solution

The sunlight is said to be white light. This means that the white light consists of seven colors. Any beam of white light from any source can be split using a prism.
Sunlight can be split with a prism made of water.
Question 6
1 / -0

Right angle mirrors produce three images of objects. Which of the following is statements is/ are true of the middle image?

A
The middle image is the same as the object

B
The middle image is at the same distance from the mirror as the object

C
The middle image will exhibit left-right reversal relative to the object

D
The middle image is a real image

Solution

Mirrors inclined at an angle $$\theta=90^o$$ will form multiple images.

The number of images formed is given by the expression $$\dfrac{360^o}{\theta}-1$$
$$n= \dfrac{360^o}{90^o}-1$$
$$n=3$$
In these three images, 2 will be laterally inverted and the middle one formed at the joint of the two mirrors will be the same as the object as it is formed by rays getting reflected twice. Hence the middle is not laterally inverted and the same as the object.
Question 7
1 / -0

Which one of the following could be the color of the ray marked 1?

A
Violet

B
Red

C
Green

D
Indigo

Solution

The order of colors in the spectrum obtained from the prism is VIBGYOR.It is observed that the violet color is most deviated and ray 1 is most deviated in given diagram so ray 1 will be violet color.
Question 8
1 / -0

Which of these correctly defines the term - Dispersion?

A
Splitting of sunlight

B
Splitting of light in the night

C
Splitting of light in into its constituent colours

D
None of these

Solution

Dispersion is splitting of light into it's consitutent colours, hence option $$C$$ is correct.
Question 9
1 / -0

To demonstrate dispersion of light, a teacher sets up an experiment with a bowl of water with mirror placed on it and allows sunlight to fall on it as shown. Why is a spectrum observed on the wall?

A
Because the bowl and the water act like a prism

B
Because the water and mirror placed on one end acts like a prism

C
Because sunlight gets trapped inside the water in the bowl

D
none of the above

Solution

The mirror and the water in the bowl collectively act like a prism and we know when sunlight passes through a prism and allow it to fall on a screen there are seven colours seen on the screen. These are Violet, Indigo, Blue, Green, Yellow, Orange, Red.
Question 10
1 / -0

The image shows three experimental setups. A consists of a light ray incident on a plane mirror. B consists of a light beam incident on a prism and C shows light incident on a mirror placed inside a bowl filled with water. Which of the above setups will be useful for demonstrating dispersion of light?

A
only A

B
only B

C
B and C

D
only C

Solution

Dispersion is the splitting of white light into its components.
When white light falls on a prism, the different colours will experience different refractive indexes of the material of the prism. Hence, the colours will be split as they pass through the prism.

On the other hand, water drops inside the bowl will act as prisms. Therefore, they will also exhibit dispersion when light passes through them.