Light Test

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Light Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

How many holes are there in a KALEIDOSCOPE:

A
1

B
2

C
5

D
Cant be predicted

Solution

Basically, Kaleidoscope consists of three long plane mirrors tilted at an angle $$60^\circ$$ which is fitted inside the tube. One end of the tube is closed by an opaque sheet and another sheet is covered with a transparent sheet. this transparent sheet is used to see objects inside this passes is also known as eye hole of Kaleidoscope.

Option A
Question 2
1 / -0

Which of the following is(are) needed for making a KALEIDOSCOPE

A
Bangles of black colour

B
Black coloured wooden box

C
Tiny colourful glass fragments

D
None of these

Solution

A kaleidoscope is an optical instrument consisting of two or more reflecting surfaces. These surfaces are tilted towards each other at a certain angle to obtain symmetrical patterns when viewed from the other end. The tube with reflecting surfaces consists of coloured pieces of glass. By rotating the tube, symmetrical images are created. Tiny colourful glass fragment specially bangle fragments are required to prepare a KALEIDOSCOPE
Question 3
1 / -0

Which of the following is true for kaleidoscope?

A
Same pattern can't be seen twice

B
Same pattern is seen after equal intervals

C
Patterns are seen randomly

D
No pattern seen

Solution

It is a specific property of kaleidoscope that same pattern can't be seen twice. Each pattern made by the multiple reflections is unique and doesn't repeat itself.
Question 4
1 / -0

A tube containing two or more plane mirrors, inclined at certain angles to each other, is called a ________. Fill in the blanks.

A
Microscope

B
Telescope

C
Kaleidoscope

D
Periscope

Solution

Such a tube is called a Kaleidoscope. It works on the principle of multiple reflection of light.
The idea of multiple images formed by mirrors, placed at an angle to one another, is used in a kaleidoscope.
As can be seen in picture three mirrors placed at an angle to each other(axial view) are present in kaleidoscope which forms multiple images.
The side view of kaleidoscope is also given .
Question 5
1 / -0

Kaleidoscope is based on the principle of ______ of plane mirrors. Fill in the blank.

A
single reflection

B
multiple reflection

C
refraction

D
dispersion

Solution

The idea of number of images formed by mirrors placed at an angle to one another is used in a kaleidoscope. The number of plane mirrors used help in the formation of multiple images.
Question 6
1 / -0

Kaliedoscope is made by using:

A
convex mirrors

B
concave mirrors

C
plane mirrors

D
spherical mirrors

Solution

To make a kaleidoscope, three rectangular plane mirrors of the same size are placed such that the reflecting surfaces face each other.
Question 7
1 / -0

Which of the following instruments can be used for viewing and replicating repetitive patterns?

A
Periscope

B
Kaleidoscopes

C
Telescopes

D
Microscopes

Solution

Kaleidoscopes can be used for viewing and replicating repetitive patterns. Beautiful patterns are formed in a kaleidoscope because of multiple reflections.
Question 8
1 / -0

How many plane mirrors are required for a kaleidoscope?

A
1

B
2

C
3

D
4

Solution

In a kaleidoscope tube, three rectangular plane mirrors of same size are placed such that the reflecting surfaces face each other. The mirrors are bound together by a string.
Question 9
1 / -0

In dim light:

A
rods are sensitive but cones are not

B
cones are sensitive but rods are not

C
both rods and cones are sensitive

D
neither rods nor cones are sensitive

Solution

Rods and cones are light sensitive cells. Rods respond to different degrees of brightness and darkness. Cones respond mainly to colour of the incident light.
Question 10
1 / -0

When you enter a dim lighted room from sunlight at noon time. What is the change in size of pupil?

A
In the sunlight pupil contracts and after entering a dim lighted room the size of pupil increases.

B
In dim light size of pupil decreases and in sunlight the pupil size increases

C
Both A and B can occur.It depends on the size of eye

D
No change in size of pupil

Solution

Pupil control the light rays enter into the eyes.
In sunlight, the size of the pupil decreases because of high light-intensity but in dim light, the pupil gets enlarged and increase the area to enter more light ray because the low intensity and thus lets more light into the eye.

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Re-Attempt Weekly Quiz Competition

Light Test - 19

Result

Light Test - 19

Score

-

Rank

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SHARING IS CARING

Question 1

1

2

5

Cant be predicted

Solution

Question 2

Bangles of black colour

Black coloured wooden box

Tiny colourful glass fragments

None of these

Solution

Question 3

Same pattern can't be seen twice

Same pattern is seen after equal intervals

Patterns are seen randomly

No pattern seen

Solution

Question 4

Microscope

Telescope

Kaleidoscope

Periscope

Solution

Question 5

single reflection

multiple reflection

refraction

dispersion

Solution

Question 6

convex mirrors

concave mirrors

plane mirrors

spherical mirrors

Solution

Question 7

Periscope

Kaleidoscopes

Telescopes

Microscopes

Solution

Question 8

1

2

3

4

Solution

Question 9

rods are sensitive but cones are not

cones are sensitive but rods are not

both rods and cones are sensitive

neither rods nor cones are sensitive

Solution

Question 10

In the sunlight pupil contracts and after entering a dim lighted room the size of pupil increases.

In dim light size of pupil decreases and in sunlight the pupil size increases

Both A and B can occur.It depends on the size of eye

No change in size of pupil

Solution

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