Light Test

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Light Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Two beams of light; one red and the other green fall on the same spot on a white screen. The colour on the screen will appear to be

A
magenta

B
blue

C
black

D
yellow

Solution

Red + Green = Yellow
Question 2
1 / -0

Which of the following statements is correct?

A
Ultraviolet rays play useful role in the production of vitamin A.

B
Ultraviolet rays are absorbed by ordinary glasses.

C
Only infrared rays can heat up the object on which it falls.

D
Violet rays has the lowest frequency among visible light.

Solution

Ultraviolet rays are absorbed by ordinary glasses.
Question 3
1 / -0

The totally dark part of the shadow is called

A
umbra

B
eclipse

C
penumbra

D
None of the above

Solution

The totally dark part of a shadow is called umbra.
Question 4
1 / -0

A picture seen on the screen of a pinhole camera is

A
an image

B
a shadow

C
neither an image nor a shadow

D
both an image and a shadow

Solution

A picture seen on the screen of a pinhole camera is an image.
Question 5
1 / -0

If a man approaches a plane mirror at the rate of 2 km/hr, then his image would approach him at the rate of

A
1 km/hr

B
2 km/hr

C
4 km/hr

D
8 km/hr

Solution

Given: Speed of the man (object) = 2 km/hr

Let's consider that the distance between the man and the plane mirror be 'x' km.

So, the distance between the man and his image will be '2x' km because the distance of image and object in case of the plane mirror is equal.

Thus, speed of the man = x/t = 2 km/hr

Then, speed of the image = 2x/t = 4 km/hr
Question 6
1 / -0

To see a full size image of ourselves, we should use a plane mirror of ____ times the height of ourselves.

A
3

B
2

C
1/2

D
1/4

Solution

To see the full size image of the man, the man needs a mirror with height 1/2 of the height of the man.
Question 7
1 / -0

When angle of incidence in a denser medium is equal to critical angle, the angle of refraction is

A
0^o

B
30^o

C
60^o

D
90^o

Solution

When angle of incidence in a denser medium is equal to critical angle, the angle of refraction is 90⁰

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Re-Attempt Weekly Quiz Competition

Light Test - 1

Result

Light Test - 1

Score

-

Rank

-

SHARING IS CARING

Question 1

magenta

blue

black

yellow

Solution

Question 2

Ultraviolet rays play useful role in the production of vitamin A.

Ultraviolet rays are absorbed by ordinary glasses.

Only infrared rays can heat up the object on which it falls.

Violet rays has the lowest frequency among visible light.

Solution

Question 3

umbra

eclipse

penumbra

None of the above

Solution

Question 4

an image

a shadow

neither an image nor a shadow

both an image and a shadow

Solution

Question 5

1 km/hr

2 km/hr

4 km/hr

8 km/hr

Solution

Question 6

3

2

1/2

1/4

Solution

Question 7

0o

30o

60o

90o

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

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Results Announcement on: coming Monday

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0^o

30^o

60^o

90^o