Classification of Objects

Q.

A mirror reflects light and we humans are able to see ourselves in it. But we also know that we humans are opaque objects and do not let light pass through and a shadow is formed. So when we stand in front the mirror there should be a shadow on the mirror as we are opaque object but instead we see our reflection.WHY?

Q.

Materials which allow light to pass partially through them are called translucent objects.

1. None of these

2. Opaque

Q.

Which of the following is a natural luminous object?

1. Candle
2. Bulb
3. CFL
4. Sun

Q. Moon is a self-luminous body. State True / False.

1. True
2. False

Q. Mirror is an example of what kind of object?

1. Transparent
2. Translucent
3. Luminous
4. Opaque

Q.

Why do we not see shadows in a fully dark room or outside on a dark, moonless night?

Q. Whenever light falls on an opaque object, a shadow appears on the screen behind it.

1. True
2. False

Q. Which is an example of a translucent object?

1. A thin sheet of paper
2. A thin glass slab
3. A thin iron sheet
4. A wooden plate

Q.

Jugnu is a living non luminous body true or false

Q. Statement 1: At sunrise or at sunset, the shadows on the ground become much longer than the sizes of the objects.
Statement 2:The size of the shadow becomes smaller when the object is brought near the light source or the screen is moved away from the object.

Q.

What do you mean by opaque, transparent and translucent objects? Give one example for each of them. [5 MARKS]

Q. Mirror is an example of what kind of object?

1. Transparent
2. Translucent
3. Opaque
4. Luminous

Q.

12. Write the name of two objects made from opaque materials.

Q. Which of the following is an example of a living thing which emits light?

1. Bee
2. Butterfly
3. Firefly
4. Jellyfish

Q.

Suggest a situation where we obtain more than one shadow of an object at a time.

Q. A mirror can be classified as:

1. Luminous object
2. Transparent object
3. Translucent object
4. Opaque object

Q.

Butter paper is an example for a translucent object.

Q. Which is an example of a translucent object?

1. A thin sheet of paper
2. A thin glass slab
3. A thin iron sheet
4. A wooden plate

Q.

Only stars can produce light on their own.

1. True
2. False

Q.

Draw the shadow of the following object when they are kept in front of a light source and an image is formed on the screen.

Q.

Why are the moon and the planets called non-luminous bodies?

Q. Which of the following objects is not transparent?

1. Smoke
2. Air
3. Clear glass
4. Pure water

Q.

In which of the following categories can Earth be classified into?

1. Luminous during day

2. Luminous

3. Non-luminous

4. Luminous during night

Q.

Rubber is ___but glass is ___

Q.

Only stars can produce light on its own.

1. False
2. True

Q.

Name a source of light energy.

Q. Is light an opaque object? Explain

Q. If the light source is closer to the object, shadows will be ______.

1. smaller
2. same size
3. bigger
4. pointed

Q. Light from which of these torches will not form a shadow of the ball on the screen?

1. 
2. 
3. 

Q.

_____ allow only some part of light to pass through them.

1. Translucent objects

2. Opaque objects

3. Transparent objects

4. Transparent and opaque objects