Class 6 Science Chapter 8 MCQ

We cannot see anything in detail through a translucent material. Clouds are also translucent objects. Though we cannot see the sun through clouds on a cloudy day but is still there is some sunlight all around. This is because being translucent, clouds allows some of the sunlight to pass through them due to which there is light on earth even on a cloudy day.

The moon is a non-luminous object which does not have its own light. But the sun is a luminous source of light. Actually, we can see the moon because it reflects sunlight into our eyes. In generally, when sunlight falls on the surface of moon, then some of the sunlight is reflected by the moon towards the earth. And to us it appears as if the light is being given out by the moon itself. But in reality, moonlight is the sunlight which is reflected from the surface of moon. Thus, moon behaves as a cold, non-luminous mirror. It is a reflector of sunlight.

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.

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

Flower is a non-luminous object. It does not give its own light. We can see a flower because it reflects sunlight falling on it into our eyes. The flower reflects some of the sunlight falling on it in all direction, not only towards our eyes.

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

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.

When we are able to see through an object clearly it is allowing all the light to pass through it and hence it is called transparent object.

The materials like butter paper, oil paper, tissue paper, sheet of white cotton, 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 correct. Hence, your answer will be option [D].

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

The image which cannot be obtained on a screen is called a virtual image. The virtual image is just an illusion. All the three are the characteristic of a virtual image formed in a plane mirror, except option [B]. The image formed in a plane mirror is erect image, not inverted image. Remember, the image in a plane mirror is laterally inverted or sideways reversed with respect to the object.

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.

The shadow of an object has the different characteristics as the shadow of an object is erect. The shadow can be smaller than the object, equal to the object or bigger than the object. The shadow of an object is real. Irrespective of the color of the object, the shadow is always black.

As we know that due to the regular reflection of light by the smooth surface of a plane mirror, we can see an image of our face into the mirror. And when the light falling on different objects, the light is reflected back or scattered by these objects (having rough surfaces) in all direction, and we can see the objects. This is called a diffuse reflection or irregular reflection.

The bird of obstructs the sunlight to form shadow on the nearby ground. But when the same bird is flying high up in the air, even then the bird of obstructs the sunlight falling on it but its shadow is not seen on the ground because the ground is very, very far below the bird.

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.

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

The image in a plane mirror is laterally inverted or sideways reversed with respect to the object.

The image formed in a plane mirror is erect or upright.

The image formed in a pinhole camera is an example of real image because it can be received on a screen. A real image is formed when light rays coming from an object actually meet a point after reflection from the mirror.

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

Real images can be formed by a curved mirror known as concave mirror. And a concave mirror can form a virtual image only, when the object is very close to 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.

A shoe box can never form of circular shadow because in any condition it does not have a circular shape. However, a ball, a flat disc and the base of ice-cream cone can form a circular shadow.