Science [1 Marks Each] M.C.Q.

Orange.

A glass block is a transparent substance which allows the maximum amount of light to pass through it

Light shows rectilinear propagation.

Transparent.

Shadows do not give us the complete information about the shape of the object as sometimes they can mislead us with the shape of the object of an animal or a certain figure.

Notebook.

Rectilinear path.

We are able to see the objects around us because the light reflected from the objects enters our eyes.

Allow light not to pass through them.

Oily paper

Light travels in straight line.

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.

Incident ray.

Tracing paper.

Real image.

Light changes its direction after reflection. As we move the object away from the light source, the shadow becomes larger as the distance between object and the light source increases. Reflection is possible from rough surface also.

Virtual image is always eract and it cannot be taken on screen. Image formed on screen is always real and inverted.

Firefly (Jugnu) emits short bursts of light.

Light rays incident on a mirror can be reflected.

Translucent objects allow only a small part of light to pass through them.

The moon is a non-luminous object and cannot emit light of its own. It only reflects the light energy falling on it from the sun.

Glass is a transparent material. It allows light to pass through it.

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.

Objects that reflect the light falls on them can cast shadow.

A shoe box can never form a 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.

A transparent object.

In the morning, when the sun rises in the east, your shadow will be seen on the west, i.e. on the opposite side.

When an iron ball is placed in the path of a source of light, its dark shadow is cast on the screen, because the iron ball is an opaque object which blocks the passage of light.

A sheet of glass

The length of the shadow changes according to the position of the source of light, i.e., the sun with respect to the object.

Black thick paper is opaque.

Sun can be imaged by using a pinhole camera.

Planet reflects sun's light that falls on them and shines.

Real image.

New moon.

When a ray of light falls on a smooth and polished surface, whole of light is returned back in the same medium. It is called reflection of light.

The table top must be made of glass sheet because only a glass sheet can show the images of both the students, which can be seen by both of them.

Wooden block.

The image formed in the plane mirror is always of the same size as that of the object.

A Shoe box

A plane mirror can form a real image if the object itself is virtual.