Light Shadows and Reflections Test

Result

Light Shadows and Reflections Test - 16

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

Incident light falling on a surface is sent back into the same medium. This phenomenon is known as

A
Dispersion

B
Reflection

C
Refraction

D
Polarization

Solution

Reflection is the phenomenon by which any incident light falling on a surface is sent back into the same medium where it originated.
So correct answer is reflection.
Question 2
1 / -0

Three sticks are placed in an open field as shown in figure. Which of the following sticks will form the shadow of equal length?

A
Only sticks (I) and (II)

B
Only sticks (II) and (III)

C
Only sticks (I) and (III)

D
All sticks (I), (II) and (III).

Solution

The length of the shadow changes according to the position of the source of light, i.e., the sun with respect to the object. When the sun is perpendicular to the object's length then the shadow will be equal in length.
Question 3
1 / -0

You have to cast the shadow of your pencil on the wall with the help of candle in a dark room. How can you obtain a shadow smaller in size than the pencil?
[You cannot use mirrors or lenses and assume the candle to be a point source of light]

A
Keep the pencil close to the wall

B
Bring the pencil closer to the candle

C
Keep the pencil midway between the candle and the wall

D
You cannot obtain a shadow smaller than the size of the pencil
Solution
Let us understand size of shadows in different case using a toy and a point source of light, like a torch.
Large shadow will be formed when the toy is close to the light.
Smaller shadow will be formed when the toy is further from the light.
Tiny shadow will be formed when the toy is a long way from the light.
Thus, we can say the shadow of the pencil will be small in size when the pencil is taken away from the candle and close to the wall. Option A is correct.
Question 4
1 / -0

The pinhole camera works on the principle of

A
Reflection of light.

B
Refraction of light.

C
Rectilinear propagation of light.

D
Both A and B.

Solution

The pinhole camera works on the principle that light travels in straight line that is rectilinear propagation of light.

Answer-(C)
Question 5
1 / -0

The given image shows the working of which optical instrument ?

A
Telescope

B
Microscope

C
Pinhole Camera

D
Periscope

Solution

This instrument is a Pinhole Camera.

Answer-(C)
Question 6
1 / -0

When Abhishek looked at a lighted torch through an object he could see a faint glow, but not the torch. The object is

A
Transparent

B
Opaque

C
Translucent

D
None of these

Solution

Translucent objects allow only a small part of light to pass through them.
Since the object was a translucent one, Abhishek could see only a part of the torch light, i.e. a faint glow.
Question 7
1 / -0

The color of the shadow of Green ball is:

A
Red

B
Black

C
Blue

D
Green

Solution

Shadow is a region where no light enters. Since a shadow region is devoid of any light rays, the colour of the shadow is always black irrespective of the colour of the object.
Thus, The color of the shadow of a green ball is black.
Question 8
1 / -0

Which of the following is a translucent object?

A
Glass

B
Water

C
Butter paper

D
Iron sheet

Solution

Translucent objects can be defined as the objects which allow the light to pass through them partially.
For ex: Butter paper, thin sheets of plastic etc.
So, the correct option will be the option$$(C)$$.
Question 9
1 / -0

Read the given statements and select the correct option.
Statement 1: Rahul placed a colored plastic bottle in front of the beam of a torchlight. Then he placed a transparent sheet of the same size on the other side of the bottle. No shadow will form on the screen.
Statement 2: Translucent objects allow light to pass through them partially.

A
Both statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1

B
Both statement 1 and statement 2 are true but statement 2 is not the correct explanation of statement 1

C
Statement 1 is true but statement 2 is false

D
Statement 1 is false but statement 2 is true

Solution

A colored plastic bottle is an opaque material. When a light beam is an incident on it, a shadow will form on the screen.
Light can easily pass through the transparent material.
The objects which allow light to pass through them partially are known as translucent objects.
Question 10
1 / -0

Which diagram best shows the reflection of light?

A

B

C

D

Solution