6th Grade > Physics
LIGHT SHADOWS AND REFLECTION MCQs
Total Questions : 97
| Page 6 of 10 pages
Answer: Option B. ->
False
:
B
:
B
Opaque objects are those that do not allow light to pass through them. For example: wood, plastics etc.
On the other hand translucent materials are those that allow only some light to pass through them. Examples of translucent materials are tracing paper, frosted glass and thin cloth.
Answer: Option A. ->
Smoke
:
A
:
A
Among the given options, smoke is not transparent because, we cannot clearly see things through it. It does not allow all the light to completely pass through it as it is translucent in nature.
Answer: Option C. ->
Polished and plane reflecting surface
:
C
Polished and plane reflecting surfaces without irregularities and unevenness produce clear images as they cause regular reflection.
Transparent objects causes no reflection.
Only partial reflection occurs in translucent surfaces and hence, image, if formed is unclear.
:
C
Polished and plane reflecting surfaces without irregularities and unevenness produce clear images as they cause regular reflection.
Transparent objects causes no reflection.
Only partial reflection occurs in translucent surfaces and hence, image, if formed is unclear.
Answer: Option B. ->
False
:
B
:
B
Shadow formation is due to obstruction of light by an opaque or translucent object which causes darkness on the screen behind. Image formation is due to reflection of light rays from an object. These two are completely different phenomena. Hence, it is false.
Answer: Option D. ->
Mirror
:
D
:
D
Among the given options, light is necessary as it is responsible for the sensation of vision or in other words it enables us to see. Without eyes, we can not sense light. The object is obviously necessary as we can not see something which does not exist. A mirror is required only when we want to see the reflection of an object.
Answer: Option C. ->
Light
:
C
Shadow is formed on a surface only when the light is obstructed by an opaque or a translucent object. So, for the shadow formation, there should be a surface, an opaque or transluent object and incident light on the object.
:
C
Shadow is formed on a surface only when the light is obstructed by an opaque or a translucent object. So, for the shadow formation, there should be a surface, an opaque or transluent object and incident light on the object.
Answer: Option B. ->
Mirror
:
:
Yes, all opaque objects cast shadows.
Answer: Option B. ->
Mirror
:
Each Difference: 1 Mark
UmbraPenumbra(1) It is the darkest region of the shadowIt is the partially shaded region which is less darker than umbra(2) No light approaches this regionSome light rays reach this region(3) It can be found at the centreof the shadowIt can be found in the outermost region of the shadow
:
Each Difference: 1 Mark
UmbraPenumbra(1) It is the darkest region of the shadowIt is the partially shaded region which is less darker than umbra(2) No light approaches this regionSome light rays reach this region(3) It can be found at the centreof the shadowIt can be found in the outermost region of the shadow
Answer: Option B. ->
Mirror
:
:
Transparent: 1 Mark
Translucent: 1 Mark
Transparent object and a few translucent objects do not cast shadows because light passes through them.
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