Transparent, Opaque and Translucent Objects

Q. Choose the odd one out.

1. Cardboard
2. Metal sheet
3. Wooden block
4. Glass

Q.

Collective noun for clothes

Q.

Write differences between a shadow and an image.

Q.

Question 2

Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:

Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, Firefly, moon.

Q.

Prepare a list of at least 20 objects and classify them into solid, liquid and gas.

Q.

Silver is used to make good quality mirrors. Why?

Q. Which property of light defines the shape of a shadow?

1. Elliptical propagation of light
2. Curvilinear propagation of light
3. Circular propagation of light
4. Rectilinear propagation of light

Q.

During the summer holidays, a group of children collected a lump of salt, green grass, a broken glass piece, a small thermocol box, a pen, iron nail, glass marbles, hair, a naphthalene ball, a piece of sugar candy (mishri), and tried to group them on the basis of properties given in the table below. Help them in filling the table.

Name of the material	Appearance (Hard/soft)	Transparency (Transparent/Translucent/Opaque)	Floats/Sinks in water	Soluble/Insoluble in water

Q.

You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.​

Q. Which object reflects maximum amount of light falling on it?

1. Mirror
2. Butter paper
3. Glass
4. Water

Q. Is air around us always transparent? Discuss.

Q.

Do all opaque objects cast shadows? [1 MARK]

Q.

Which type of the following materials is used for making the front glass (windscreen) of a car?

1. Transparent

2. Translucent

3. Opaque

4. All the above

Q.

Is air around us always transparent? Discuss.

Q. Which of the following materials are translucent in nature?

1. White chalk
2. Fluoroscent bulb
3. Paper dipped in oil
4. Blue coloured glass

Q. There are four types of solar eclipse.

1. True
2. False

Q.

Define translucent materials.

Q.

Fluorescent tube lights are called shadowless lights.

1. True
2. False

Q. Which of the following objects forms the most prominent shadow?

1. Translucent
2. Opaque
3. Transparent
4. Combination of a transparent and a translucent object

Q.

Identify the translucent object from the following.

1. Frosted glass

2. Cardboard

3. Mirror

4. Clear water

Q.

Encircle the odd one out.

Give reasons for your choice: Shadows, eclipses, glowworms and images

Q.

1. entire
2. some
3. very less
4. no

Q. Which among the following objects must be used to cover the window of a room, so that the room remains dark during the day time?

1. Glass pane
2. Butter paper
3. Wooden board
4. Tracing paper

Q.

If a player is wearing a uniform consisting of a red shirt and a white short as seen in white light, so state what will be the appearance of the shirt and short in red light?

Q. What is effective refractive index?

Q.

Explain the appearance of the colour of an object on the basis of absorption and reflection of light.

Q. Substances that allow light to pass through them are called

1. Transparent
2. Translucent
3. Opaque
4. None of these

Q.

Objects that do not allow light to pass through them are called __________ objects.

1. Transparent.

2. Translucent.

3. Opaque.

4. None of these.

Q. Select the odd one out w.r.t. transparency (wood, stone, cement, glass)

1. glass
2. wood
3. cement
4. stone

Q. Butter paper is an example for ........ objects.

1. A transparent
2. A translucent
3. An opaque
4. A luminous