Light Test

Result

Light Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

Amount of light reflected depends upon

A
Nature of material of the object

B
Nature of the surface

C
Smoothness of the surface

D
All of these

Solution

The amount of light reflected depends upon the nature of the material of the object, the nature of the surface, and the smoothness of the surface. If the material is opaque for incident light, then the total amount of incident light gets reflected. Otherwise, a part of the incident light can get transmitted. If the surface is smooth, the reflection is more, otherwise reflected light can get scattered.
Question 2
1 / -0

The path along which light travels is called a ........

A
ray

B
line

C
line segment

D
none

Solution

The path along which light travels is called a Ray.
Question 3
1 / -0

....... are drawn on light rays to show the direction in which light travels.

A
RAYS

B
ARROWS

C
LINES

D
LINE SEGMENTS

Solution

ARROWS are used to specify the direction of propagation of a light.
Question 4
1 / -0

The Braille code used by blind people use dot patterns for words. How many dot patterns or characters are used for this code?

A
52

B
63

C
48

D
26

Solution

Braille is a system of raised dots that can be read with the fingers by people who are blind or who have low vision.It consists of a code of $$63$$ characters , each made up of $$1$$ to $$6$$ raised dots arranged in a six position matrix.
Question 5
1 / -0

If two mirrors are kept at $$60^0$$ to each other and a body is placed in the middle, then total number of images formed is

A
Three

B
Four

C
Five

D
Six

Solution

The formula for finding this is : - $$n=360/x$$ or $$n=360/x - 1$$,
where $$n$$ is the no. of images, x is the angle of inclination between the two mirrors & n is always an odd integer.
So, in this case, $$n = \dfrac{ 360 }{60} -1 = 6 - 1= 5$$
Question 6
1 / -0

The principle of successive reflections of light at inclines mirrors is used in

A
Periscope

B
Telescope

C
Microscope

D
Kaleidoscope

Solution

A Kaleidoscope operates on the principle of multiple reflection. Typically there are three rectangular mirrors set at 60 to each other so that they form an equilateral triangle. The 60 angle creates seven duplicate images of the objects, five at 60, and 2 at 90. As the tube is rotated, the tumbling of the coloured objects presents varying colours and patterns.
Question 7
1 / -0

We are able to see objects around us because :

A
The objects absorb all the light.

B
The light reflected from the object enters our eyes.

C
Light can be refracted.

D
Light travels in straight lines.

Solution

We are able to see objects around us because the light reflected from the object enters our eyes.
Question 8
1 / -0

Two mirrors are inclined at an angle $$\theta$$. For an object placed in front of them, 11 images are noticed. Find the angle between the mirrors :

A
$$ { 30 }^{ \circ }$$

B
$$ { 32.8 }^{ \circ }$$

C
$$ { 16.4 }^{ \circ }$$

D
$$ { 15 }^{ \circ }$$

Solution

When two plane mirrors are inclined to each other at an angle $$\theta$$ ,then number of images ($$n$$) formed of an object which is kept between them is given by
$$ n = (\dfrac {360}{\theta} - 1)$$

Given $$ n= 11$$

$$\implies (\dfrac {360}{\theta} - 1) = 11$$

$$\implies \theta = 30^o$$
Question 9
1 / -0

An object is placed near two perpendicular plane mirrors shown in the figure. How many images will be formed?

A
1

B
2

C
3

D
4

Solution

Accroding to given fig.
An object is kept at angle bisector line of both mirrors.

$$n=\dfrac {360^o}{90^o}-1=4-1$$
$$\Rightarrow n=3$$

3 Image will formed.
Question 10
1 / -0

When the white light is passed through a equilateral prism it splits into seven colours. The phenomena of splitting of white light is called :

A
$$refraction$$

B
$$spectrum$$

C
$$dispersion$$

D
$$scattering$$

Solution

$$ \begin{array}{l} \text { when the white light is passed through a } \\ \text { equilateral prism it splits into seven colours } \\ \text { phenomena of splitting of white light } \\ \text { is called dispersion. } \end{array} $$

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Re-Attempt Weekly Quiz Competition

Light Test - 30

Result

Light Test - 30

Score

-

Rank

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SHARING IS CARING

Question 1

Nature of material of the object

Nature of the surface

Smoothness of the surface

All of these

Solution

Question 2

ray

line

line segment

none

Solution

Question 3

RAYS

ARROWS

LINES

LINE SEGMENTS

Solution

Question 4

52

63

48

26

Solution

Question 5

Three

Four

Five

Six

Solution

Question 6

Periscope

Telescope

Microscope

Kaleidoscope

Solution

Question 7

The objects absorb all the light.

The light reflected from the object enters our eyes.

Light can be refracted.

Light travels in straight lines.

Solution

Question 8

$$ { 30 }^{ \circ }$$

$$ { 32.8 }^{ \circ }$$

$$ { 16.4 }^{ \circ }$$

$$ { 15 }^{ \circ }$$

Solution

Question 9

1

2

3

4

Solution

Question 10

$$refraction$$

$$spectrum$$

$$dispersion$$

$$scattering$$

Solution

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