6th Grade > Physics
LIGHT SHADOWS AND REFLECTION MCQs
Total Questions : 97
| Page 2 of 10 pages
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The image formed by a pin-hole camera is inverted.
Answer: Option A. -> to see it using a blackened/dark plate of glass
:
A
Looking at the sun can cause permanent damage to one's eyes even on an eclipse. This is because the intensity of light coming from the sun is very high. In order to observe a solar eclipse, one should use a media which absorbs or reflects most of the sunlight allowing just a small fraction of light to fall on our eyes. One such media can be a glass plate blackened over sooty flame of a candle.
:
A
Looking at the sun can cause permanent damage to one's eyes even on an eclipse. This is because the intensity of light coming from the sun is very high. In order to observe a solar eclipse, one should use a media which absorbs or reflects most of the sunlight allowing just a small fraction of light to fall on our eyes. One such media can be a glass plate blackened over sooty flame of a candle.
Answer: Option A. -> True
:
A
Light travels in a straight line. Thus light from the top of the object after passing through the pinhole will reach the bottom of the camera screen and light from the bottom of the object will pass through the pinhole and reach the top of the screen. This will cause an inversion of the image as shown below.
:
A
Light travels in a straight line. Thus light from the top of the object after passing through the pinhole will reach the bottom of the camera screen and light from the bottom of the object will pass through the pinhole and reach the top of the screen. This will cause an inversion of the image as shown below.
Answer: Option B. -> False
:
B
When we see our image in a mirror, following steps occur:
When the room is dark, where no light source exists, step 1 does not happen and hence, we cannot see our reflection in the mirror.
:
B
When we see our image in a mirror, following steps occur:
- Light from a source falls on the face.
- Our face reflects (diffused reflection) light in all directions.
- Reflected light from the face falls on the mirror and is reflected back.
- When light reflected from mirror reaches our eyes, we see our face.
When the room is dark, where no light source exists, step 1 does not happen and hence, we cannot see our reflection in the mirror.
Answer: Option A. -> By using glass paint
:
A
Cardboard and metal sheets are opaque and attaching them will makethe glass opaque.
After attaching another glass sheet, the glass remains transparent as both glass sheets allow all light to pass through them.
Painting the sheet with glass paint,will cause partial absorptionof light, thereby making it translucent.
:
A
Cardboard and metal sheets are opaque and attaching them will makethe glass opaque.
After attaching another glass sheet, the glass remains transparent as both glass sheets allow all light to pass through them.
Painting the sheet with glass paint,will cause partial absorptionof light, thereby making it translucent.
Answer: Option A. -> Transparent object
:
A
For a shadow to be formed, light should be obstructed by the object so that the screen behind it stays dark. Since transparent objects allows light to pass through them, they cannot form a shadow.
Translucent objects allows light to pass through them partially. Opaque objects do not allow light to pass through them. Therefore, translucent and opaque objects cast a shadow. Metals are opaque objects.
:
A
For a shadow to be formed, light should be obstructed by the object so that the screen behind it stays dark. Since transparent objects allows light to pass through them, they cannot form a shadow.
Translucent objects allows light to pass through them partially. Opaque objects do not allow light to pass through them. Therefore, translucent and opaque objects cast a shadow. Metals are opaque objects.
Answer: Option A. -> True
:
A
Opaque objects don't allow the light to pass through them. Mirror doesn't allow light to pass through it. A beam of light gets reflected back after striking the mirror.
:
A
Opaque objects don't allow the light to pass through them. Mirror doesn't allow light to pass through it. A beam of light gets reflected back after striking the mirror.
Answer: Option A. -> During evening and morning the angle of elevation from the Sun is low.
:
A
At noon the sun is at its highest point, so it hits you at an angle closest to 90∘ than any other part of the day. In the morning and late afternoon, however, it is much lower in the sky and hits you at a more lateral angle, extending your shadow.
:
A
At noon the sun is at its highest point, so it hits you at an angle closest to 90∘ than any other part of the day. In the morning and late afternoon, however, it is much lower in the sky and hits you at a more lateral angle, extending your shadow.
Answer: Option A. -> luminous body
:
A
Objects which emit light of their own are called luminous objects. Stars, flashlight, candles etc are examples of luminous objects. Non-luminousobjects are visible because they reflect light emitted by luminous objects.
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A
Objects which emit light of their own are called luminous objects. Stars, flashlight, candles etc are examples of luminous objects. Non-luminousobjects are visible because they reflect light emitted by luminous objects.
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