Light Test

Result

Light Test - 40

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is not correct for Braille system?

A
Transcription method for preparing Braille includes slates and stylus

B
Character represents a letter, a combination of letters, a common word or a grammatical sign

C
Each character in Braille system need to be recognised

D
For some languages, Braille is read from right to left

Solution

Cells are read from left to right,regardless of the language they are used to encode.
Each Braille character is made up of six dots,arranged in matrix of dots.
Braille is produced manually or by computer.Braille is used to transcribe text in natural languages by encoding individual letters,abbreviations and short hand contractions per language.
Braille is always read from left to right irrespective of language.
Question 2
1 / -0

The incident ray, the reflected ray and the .......... all lie on the ....... plane.

A
Normal, different

B
Normal, same

C
Emergent ray, different

D
Emergent ray, same

Solution

From the laws of reflection, we know that
The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence, all lie in the same plane.

Hence, the correct answer is OPTION B.
Question 3
1 / -0

Mark the statements which is true for Braille system:

A
It makes up the letters of alphabets,punctuation marks

B
It has 63 dot patterns or characters

C
Dots are arranged in cells of 3 vertical rows of maximum 2 dots in each.

D
All are true

Solution

In the braille system, there are only $63$ dot patterns, including space, the characters of a braille script commonly have multiple values, depending on their context. These dots are arranged in cells of $3$ vertical rows of maximum $2$ dots in each.
Option D is correct.
Question 4
1 / -0

Which of the following statement is true for laws of reflection?

A
The incident ray, reflected ray and the normal lie in the same plane.

B
Angle of incidence is equal to the angle of reflection.

C
Both A and B

D
None
Solution
The laws of reflection are:
The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence, all lie in the same plane.
The angle which the incident ray makes with the normal called the angle of incidence is equal to the angle which the reflected ray makes with the normal called the angle of reflection.
$\angle i = \angle r$

Hence, the correct answer is OPTION C.
Question 5
1 / -0

According to laws of reflection, the angle of incidence is equal to the angle of reflection. On what condition this statement is true?

A
It is always true

B
It is true sometimes

C
This is true only under special conditions

D
It can never happen

Solution

Laws of reflection are Universal laws and hold true at all times for all the mirrors.
Therefore, the law that the angle of incidence is equal to angle of reflection is always true.

Hence, the correct answer is OPTION A.
Question 6
1 / -0

Match the columns:
i) Visual aids a) used for minor eye defects or partial blindness.
ii) Electronic aids b) includes cassettes, tape recorders, talking books.
iii) Auditory aids c) used for people having little vision.
iv) Optical aids d) available for performing computational tasks.

A
i-b,ii-d,iii-a,iv-c

B
i-d,ii-a,iii-c,iv-b

C
i-c,ii-d,iii-b,iv-a

D
i-a,ii-c,iii-d,iv-b
Solution
- Visual aids can magnify words, can provide suitable intensity of light.
- Electronic aids available for performing computational tasks.
- Auditory aids include talking books, cassettes, audio players etc.
- Optical aids include contact lenses, bifocal lenses.
So correct match is i-c, ii-d, iii-b, iv-a
Question 7
1 / -0

A man goes to a barber shop with two mirrors placed parallel and facing each other. He observes himself in one of the mirrors. How many images will he see?

A
1

B
2

C
infinite

D
insufficient information

Solution

Due to continuous infinite reflections from the mirrors, infinite images are formed. This is a common phenomenon taking place in barbershops when the mirrors are placed parallel.
Question 8
1 / -0

If the tube of a kaleidoscope is filled with thick black smoke, the pattern:

A
will change and will not be observable

B
will not change and will not be observable

C
will not change and will be observable

D
will change and will be observable

Solution

Above diagram show a simple kaleidoscope .
A kaleidoscope is a toy that uses light and mirrors to reflect objects and create beautiful, fascinating repeating patterns.
The pattern depends upon the positioning of the object and the mirrors. So, the pattern will not change because object and mirror positions are fixed. But, as the tube is filled with thick black smoke, no light will come out to the eye piece. So, the pattern will not be observable.
Question 9
1 / -0

Two parallel plane mirrors placed facing each other forms $\infty$ images of an object. Does this hold good, if they are placed at an angle $\theta \neq 0$ ?

A
Yes

B
No

C
Only if angle is of the form $\theta = \pi/n,\ \ n={1,2,3....}$

D
Only if angle is of the form $\theta \neq \pi/n,\ \ n={1,2,3....}$

Solution

Number of images formed are $n=(2\pi/\theta)-1\ \text{where}\ \theta\ \text{is in radians}$ .Hence option B is correct.
Question 10
1 / -0

Minimum number of mirrors used in a kaleidoscope is:

A
1

B
2

C
3

D
4

Solution

A kaleidoscope is an optical instrument with two or more reflecting surfaces (or mirrors) tilted to each other at an angle. The diagram shows a kaleidoscope with $3$ mirrors.
Hence the minimum no of mirrors is $2.$

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Light Test - 40

Result

Light Test - 40

Score

-

Rank

-

SHARING IS CARING

Question 1

Transcription method for preparing Braille includes slates and stylus

Character represents a letter, a combination of letters, a common word or a grammatical sign

Each character in Braille system need to be recognised

For some languages, Braille is read from right to left

Solution

Question 2

Normal, different

Normal, same

Emergent ray, different

Emergent ray, same

Solution

Question 3

It makes up the letters of alphabets,punctuation marks

It has 63 dot patterns or characters

Dots are arranged in cells of 3 vertical rows of maximum 2 dots in each.

All are true

Solution

Question 4

The incident ray, reflected ray and the normal lie in the same plane.

Angle of incidence is equal to the angle of reflection.

Both A and B

None

Solution

Question 5

It is always true

It is true sometimes

This is true only under special conditions

It can never happen

Solution

Question 6

i-b,ii-d,iii-a,iv-c

i-d,ii-a,iii-c,iv-b

i-c,ii-d,iii-b,iv-a

i-a,ii-c,iii-d,iv-b

Solution

Question 7

1

2

infinite

insufficient information

Solution

Question 8

will change and will not be observable

will not change and will not be observable

will not change and will be observable

will change and will be observable

Solution

Question 9

Yes

No

Only if angle is of the form θ=π/n, n=1,2,3....\theta = \pi/n,\ \ n={1,2,3....}θ=π/n, n=1,2,3....

Only if angle is of the form θ≠π/n, n=1,2,3....\theta \neq \pi/n,\ \ n={1,2,3....}θ=π/n, n=1,2,3....

Solution

Question 10

1

2

3

4

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

Only if angle is of the form $\theta = \pi/n,\ \ n={1,2,3....}$

Only if angle is of the form $\theta \neq \pi/n,\ \ n={1,2,3....}$