Opaque

Q. Which of the following are NOT opaque objects?

Q.

Which of the following are translucent materials?

A. Air B. Ground glass C. Clouds D. Aluminium sheet

1. A and B

2. B and C

3. . A and C

4. . B and D

Q. A thin metal sheet is an opaque object.

1. False
2. True

Q. Which of the following items do not allow light to pass through it?

1. Transparent
2. Translucent
3. Both a and b
4. Opaque

Q.

What are the uses of transparent, translucent & opaque objects?

Q. Is light opaque, transparent or translucent?

Q. A rubber ball is an example of ___.

1. a transparent object
2. an opaque object
3. a translucent obejct
4. None of the above

Q. How does transparent object form shadow?

Q. If the obstacle is an opaque object and the screen is clearly transparent, then the shadow will not be formed.

1. True
2. False

Q.

State two conditions in order to observe a shadow.

Q. Which of the following is true about a plane mirror?

1. It has a smooth surface.
2. It can reflect light.
3. It always forms an inverted image.
4. It is transparent.

Q. Which of the following would reflect most of the light falling on it?

1. Wood
2. Thin plastic sheet
3. Gases
4. Mirror

Q.

Concrete is an example of ____ object.

1. Translucent

2. Transparent

3. Reflecting and opaque

4. Opaque

Q. A ________ patch is formed on a screen behind an opaque object when it is placed in the path of light.

1. white
2. red
3. dark
4. colourful

Q. In a dark room, a white light source shines a beam of light through a triangular hole to cast light on the screen. There is a translucent blue glass block between the triangular hole and the screen.

Which of the following image will be shown on the screen?

1. 
2. 
3. 
4. 

Q. Which of the following objects will cast a shadow?

1. Wax paper
2. Water in a glass
3. Wooden chair
4. Coloured window glass

Q.

In all opaque object the shadow will form or not

Q.

Material that allows light to pass through it partially are called ___ .

Q. Match the following objects with their types.

1. Air
2. Mirror
3. Smoke
4. Sun

Q.

As mentioned, transparent objects do not cast shadows at all. But, if we take a glass or a transparent ruler, and hold it above a paper, tile etc, a faint shadow is cast. Why is it so?

Q.

The type of object that doesn't cast shadow is known as ___ .

Q.

___ objects allow light to pass through them, they cannot form a shadow.

Q. A shadow forms when obstructs the path of light.

Q. Which of the following describes an object that allows no light to pass through it ?

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

Q.

Mirror is an opaque object.

1. True

2. False

Q. What are \translucent\ objects? Give two examples.

Q. Match the following objects with their types.

1. Air
2. Mirror
3. Smoke
4. Sun

Q.

Opaque objects allow light to pass through them partially.

1. True

2. False

Q. Mirror is an opaque object.

1. False
2. True

Q. Which of the following can create a shadow when light falls on them?

1. Mirror
2. Transparent objects
3. Glass sheet
4. Opaque objects