Light Shadows and Reflections Test

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Light Shadows and Reflections Test - 10

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Question 1
1 / -0

Diamond is :

A
transparent

B
translucent

C
opaque

D
semi-absorbent

Solution

$$\bullet$$ Objects which allow the light to pass through them completely without any obstruction are called $$ \bf{transparent} $$ objects.
$$\bullet$$Objects which allow the light to pass through them partially are called $$ \bf{translucent} $$ objects.
$$\bullet$$Objects which do not allow the light to pass through them are called $$\bf{opaque} $$ objects.
$$\bullet$$ Since a diamond allows the light to pass through it completely without any absorption or obstruction of light, it is a transparent object.

Hence Option A correct
Question 2
1 / -0

Which type of objects can cast shadows?

A
Transparent objects

B
All types of objects

C
Opaque objects

D
Only heavy objects can cast shadows

Solution

Shadow is formed when rays of light are stopped by an opaque object.
Question 3
1 / -0

Identify the instrument from the given image.

A
Periscope

B
Kaleidoscope

C
Pinhole Camera

D
None of the above

Solution

The instrument is an example of pinhole camera.
Question 4
1 / -0

Why does the pinhole camera produce an inverted image ?

A
The light passing through a convex lens produces an inverted image

B
The light passing through a concave lens produces an inverted image

C
The light travelling in a straight line passes through aperture to produce an inverted image

D
Pinhole camera produces an upright image

Solution

A pinhole camera is a simple camera without a lens but with a tiny aperture, a pinhole – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.
Question 5
1 / -0

What kind of lens is used in making a pinhole camera ?

A
Concave lens

B
Convex lens

C
Concavo-convex lens

D
No lens is used

Solution

A pinhole camera is a simple camera without a lens but with a tiny aperture, a pinhole – effectively a light-proof box with a small hole in one side.
Question 6
1 / -0

What is the role of aperture in pinhole camera ?

A
Sharpens the image

B
Allows light to enter to form the image

C
Diffracts light passing through it

D
None of these

Solution

A pinhole camera is a simple camera without a lens but with a tiny aperture,(aperture is nothing but the hole here) a pinhole – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box.
Question 7
1 / -0

Which of the following statements is true?

A
The image formed by a pinhole camera is inverted because light travels in a straight line.

B
Light does not change its direction on reflection.

C
As we move the object away from the light source, the shadow of the object becomes smaller.

D
Reflection is possible only from polished surface.

Solution

Solution:
b) We know, Light changes its direction after reflection, therefore this option is wrong.
c) As we move the object away from the light source, the shadow becomes larger as the distance between the object and the light source increases.
d) Reflection is possible from a rough surface (eg. wall, road) that is the reason why we can see those objects therefore this option is false
The pinhole camera produces an inverted image because light travels in a straight line, this statement is correct.
Question 8
1 / -0

Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of

A
Unpolished wood, covered with white cloth

B
Polished glass of red colour

C
Glass covered with cellophane paper

D
Smoked glass covered with green colour cloth.

Solution

A polished glass of red colour reflects most of the light incident on it so images of both persons are formed on it.
Question 9
1 / -0

Which of the following is not a characteristic of pinhole camera ?

A
It produces an inverted image

B
It works on the principle of rectilinear motion of light

C
It is inexpensive to make

D
The image produced is black and white

Solution

Pinhole camera
- image formed is inverted (upside down) as compared to the object.
- image formed is real (because it can be formed on a screen) and of the same colour as the object.
- Image can be smaller than the object, equal to the object or bigger than the object (depending on the distance of object from the pinhole camera).
- Is inexpensive to make
- works on the principle of rectilinear motion of light
Question 10
1 / -0

Which of the following is an example of natural pinhole camera ?

A
Thorns on a stem

B
Pollen grains in flower

C
Holes in a leaf

D
All the above

Solution

Tiny hole in a leaf is an example of natural pinhole camera.

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Light Shadows and Reflections Test - 10

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Light Shadows and Reflections Test - 10

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Question 1

transparent

translucent

opaque

semi-absorbent

Solution

Question 2

Transparent objects

All types of objects

Opaque objects

Only heavy objects can cast shadows

Solution

Question 3

Periscope

Kaleidoscope

Pinhole Camera

None of the above

Solution

Question 4

The light passing through a convex lens produces an inverted image

The light passing through a concave lens produces an inverted image

The light travelling in a straight line passes through aperture to produce an inverted image

Pinhole camera produces an upright image

Solution

Question 5

Concave lens

Convex lens

Concavo-convex lens

No lens is used

Solution

Question 6

Sharpens the image

Allows light to enter to form the image

Diffracts light passing through it

None of these

Solution

Question 7

The image formed by a pinhole camera is inverted because light travels in a straight line.

Light does not change its direction on reflection.

As we move the object away from the light source, the shadow of the object becomes smaller.

Reflection is possible only from polished surface.

Solution

Question 8

Unpolished wood, covered with white cloth

Polished glass of red colour

Glass covered with cellophane paper

Smoked glass covered with green colour cloth.

Solution

Question 9

It produces an inverted image

It works on the principle of rectilinear motion of light

It is inexpensive to make

The image produced is black and white

Solution

Question 10

Thorns on a stem

Pollen grains in flower

Holes in a leaf

All the above

Solution

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