Class 6 Science Chapter 11 MCQ

Here, are all the statements are correct. Hence, your answer will be option [D].

The periscope is a device which gives us the higher view than normal. By using a periscope, we can see the objects on the other side of a high wall without having to climb over the wall. A soldier sitting in a trench can observe the enemy activities above the ground by using a periscope. Actually, a periscope works on the reflection of light from the two plane mirrors angle two parallel to one another.

A plane mirror is a thin, flat and smooth sheet of class having a shiny coating of silver metal or aluminum metal on one side. The regular reflection of light by a smooth, surface of a plane mirror produces an image of our face when we look into the mirror. A plane mirror always forms virtual images. The reflections of objects in water are also virtual images.

Our shadow is shortest at noon. The length of our shadow goes on decreasing till noon. The length of our shadow starts increasing in the afternoon. And our shadow becomes very long in the evening and just before sunset. As the sun rises in the sky, the shadow of a building shortens.

The materials like butter paper, oil paper, tissue paper, sheet of white cotton, ground glass (frosted glass), muddy water and clouds are translucent materials. They allow only a part of the light falling on their surface to pass through them. As we cannot see clearly through a translucent material.

Here, are all the statements are incorrect. Hence, your answer will be option [C]. [A] The pinhole camera works on the principle that light travels in straight lines. [B] An inverted image is formed in a pinhole camera very simply. [D] The pinhole camera is a simple device to see the images of various objects.

Here, are all the statements are correct. Hence, your answer will be option [D].

The shadow of an object is real because it can be formed on a screen.

Those materials which allow all the light to pass through them are called transparent materials. The materials like glass, polythene, air, water and groundnut oil are transparent materials. They allow almost all the light to pass through them. Remember, glass is a transparent material which allows all the light coming from the material kept inside it.

Both the size and shape of the shadow of the tree will be changed because at 8 a.m. and 3 p.m., the length of the shadows of free will be longer than its actual length and point to the west and the east directions, respectively. However, at 12 noon, the sun will be high in the sky just above the tree, so the shadow of tree will be shot.

Here, are all the statements are correct. Hence, your answer will be option [D].