Light Test

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Light Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

An unlabeled analog clock is kept in front of mirror. Actual time on clock is 3. What is time in the mirror image?

A
3

B
9

C
6.15

D
9.30

Solution

Due to lateral inversion, hour hand of image points to 9. Minute Hand keeps pointing to 12. Hence, time in mirror image is 3.
Question 2
1 / -0

Why is it difficult to read image of a sentence from a book in a plane mirror?

A
Due to lateral inversion

B
Due to scattering

C
Due to vertical inversion

D
Due to loss on reflection

Solution

On reflection from plane mirrors, Objects undergo lateral inversion.
Most of the alphabets are not symmetrical laterally and on reflection produce unrecognizable alphabets. Also, letters on the right appear on the left. This hurt the sequence of letters and makes words and sentences meaningless.
Question 3
1 / -0

Why is AMBULANCE written laterally inverted on an Ambulance van?

A
It gathers more attention since it is laterally inverted.

B
Vehicle in front sees a laterally inverted image and perceives it correctly, hence giving side to the ambulance van.

C
Vehicle in front sees a virtually erect image and perceives it correctly, hence giving side to the ambulance van.

D
None of the above.

Solution

Ambulance is usually in a hurry. In order to convey the vehicle in front that it is an ambulance, it is written laterally inverted. When the driver of the vehicle in front reads through the rear-view mirror, the Image of this inscription, through lateral inversion, form a right oriented image.
Question 4
1 / -0

Comparing real and virtual images, we may say that

A
Real images can not be obtained on a screen and virtual images can be

B
Virtual images can not be obtained on a screen and real images can be

C
Both real and virtual images can be obtained on a screen

D
Neither real nor virtual images can be obtained on a screen

Solution

Real images can be obtained on a screen. On-screen rays meet in real.
Virtual images can not be obtained on a screen. Because there is no meaning of screen for the virtual image.
Question 5
1 / -0

A real image is formed by

A
actual intersection of the refracting or reflecting rays

B
imaginary intersection of the refracting or reflecting rays produced backwards

C
either actual or imaginary intersection of the reflecting or refracting rays

D
neither actual nor imaginary intersection of the reflecting or refracting rays

Solution

When the refracting or reflecting rays actually intersect, rather than pretending to be meeting at a point ,a real image is formed.A real image hence can be obtained on a screen.
Question 6
1 / -0

Which of the following is/are type(s) of reflection?

A
Regular reflection

B
Irregular reflection

C
Both

D
None

Solution

There are two kinds of reflection
I) Regular reflection occurs from smooth surface.
ii) Irregular reflection occurs from rough surface.
Question 7
1 / -0

Fill in the blanks:
An image that cannot be obtained on a screen is called _________.

A
real

B
virtual

C
plane

D
none

Solution

Virtual images cannot be obtained on a screen as they are not formed by actual intersection of light rays. Virtual images are formed when light rays appear to be diverging from a point.
Question 8
1 / -0

From below given colors, which colour is not present in 7 colours of rainbow?

A
Violet

B
Purple

C
Green

D
Indigo

Solution

As per VIBGYOR, we have Violet, Indigo, Blue, Green, Yellow, Orange and Red colours in the rainbow.
Hence Purple colour is not available in the rainbow.
Question 9
1 / -0

If a newton's color disc composed of seven colors is rotated at high speed, it appears as

A
Seven coloured disc rotating

B
Few colours merge and only three dominant colours are visible

C
Colours mix and it appears white

D
Colours mix giving a sparkling effect

Solution

Human eyes cannot differentiate between different colors when they move at a high speed. So, white light comprises seven colours. Hence, when a newton's colour disc composed of seven colours is rotated at a high speed, it appears as Colours mix as it appears white.
Question 10
1 / -0

If the object is shifted by a distance towards the mirror, the image will shift by _______ towards the mirror.

A
Double the distance

B
Same distance

C
Half the distance

D
None of these

Solution

If the object is shifted by a distance towards the mirror, the image will shift by the same distance towards the mirror.

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Re-Attempt Weekly Quiz Competition

Light Test - 12

Result

Light Test - 12

Score

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Rank

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SHARING IS CARING

Question 1

3

9

6.15

9.30

Solution

Question 2

Due to lateral inversion

Due to scattering

Due to vertical inversion

Due to loss on reflection

Solution

Question 3

It gathers more attention since it is laterally inverted.

Vehicle in front sees a laterally inverted image and perceives it correctly, hence giving side to the ambulance van.

Vehicle in front sees a virtually erect image and perceives it correctly, hence giving side to the ambulance van.

None of the above.

Solution

Question 4

Real images can not be obtained on a screen and virtual images can be

Virtual images can not be obtained on a screen and real images can be

Both real and virtual images can be obtained on a screen

Neither real nor virtual images can be obtained on a screen

Solution

Question 5

actual intersection of the refracting or reflecting rays

imaginary intersection of the refracting or reflecting rays produced backwards

either actual or imaginary intersection of the reflecting or refracting rays

neither actual nor imaginary intersection of the reflecting or refracting rays

Solution

Question 6

Regular reflection

Irregular reflection

Both

None

Solution

Question 7

real

virtual

plane

none

Solution

Question 8

Violet

Purple

Green

Indigo

Solution

Question 9

Seven coloured disc rotating

Few colours merge and only three dominant colours are visible

Colours mix and it appears white

Colours mix giving a sparkling effect

Solution

Question 10

Double the distance

Same distance

Half the distance

None of these

Solution

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