Lights, Shadows and Reflections | Chapter Assessment | English | Grade 6

The things through which light can pass completely are known as __________ .

• transparent

• translucent

• opaque

• none of these

Answer explanation

The things through which light can pass completely are known as transparent e.g. Glass tumbler from which we can see through.

Tags

NGSS.MS-PS4-2

Find the odd one out.

• Wooden frame

• Wall of the room

• Glass tumbler

• Metal door

Answer explanation

Things through which light passes completely are known as transparent objects. Here, from glass tumbler, light passes and we are able to see through it. From wooden frame, wall of the room, metal door, we cannot see through, i.e. light do not pass through them. These objects are opaque objects. So the correct answer is option 3.

Which of the following is translucent object?

• Wooden frame

• Butter paper

• Glass tumbler

• Plastic compass box

Answer explanation

Material through which light passes partially are said to be translucent. Among the given options, butter paper is the translucent object.

Tags

NGSS.MS-PS4-2

Materials through which light cannot pass through are known as _________ .

• Transparent materials

• Translucent materials

• Opaque materials

• None of these

Answer explanation

Materials through which light cannot pass through are known as opaque material.

Complete the following sentence, "Shadow is formed when ______."

• a transparent object in placed in the path of light

• an opaque object is placed in the path of the light

• a translucent object is placed in the path of light

• a transparent, opaque and translucent object is placed in the path of light.

Answer explanation

A shadow is formed when an opaque object is placed in the path of the light.

In the given situation, A shows the source of light, say a torch. When torch is lighted, the light reflects from object B, which creates a patch of light at screen C. Which of the following object should be placed at point B?

• A wooden sheet

• A paper sheet

• A glass frame

• A mirror

Answer explanation

Patch of light will be seen on the screen C when, light will get reflected from B. So we need to choose the reflecting surface. Among the given options mirror is the only reflecting surface. Therefore, the correct answer is option 4.

Tags

NGSS.MS-PS4-2

Observe the given situation carefully and identify the type of material of object D.

• Glass

• Wood

• Metal

• Cardboard

Answer explanation

In the given situation, A is the source of light, B is the reflecting surface and C is screen where patch of light is obtained. D is an object placed in the path of the reflected light. If we look at the image carefully, then the light ray reflected from the reflecting surface passes through the object D. We know that, thing through which light completely pass through are transparent. Therefore, object D must be transparent. Among the given option, glass is the only transparent material, rest all are the opaque materials. Therefore, the correct answer is option 1.

Tags

NGSS.MS-PS4-2

Choose the correct statement among the following. (i) Light cannot pass through an opaque objects (ii) Light can pass completely through transparent objects (iii) Transparent object reflects most of the light.

• (i) and (ii)

• (i) and (iii)

• (ii) and (iii)

• (i) (ii) and (iii)

Answer explanation

Light cannot pass through opaque objects, where as light can pass through transparent objects. Therefore, option 1 is correct answer. Transparent object reflects most of the light is the false statement. Transparent objects reflects least amount of light, while the opaque shiny objects reflects most amount of light.

Tags

NGSS.MS-PS4-2

Which of the following torch will form the shadow of the ball on the screen?

• A

• B

• C

• None of these

Answer explanation

Light travels in a straight line. Therefore, torch B will form the shadow of the ball on the screen. Torch A and torch C will form the shadows of the ball away from the screen.