6th Grade > Physics
LIGHT SHADOWS AND REFLECTION MCQs
Total Questions : 97
| Page 9 of 10 pages
Answer: Option C. ->
The sharpness is high if the light is from a point source.
:
C
:
C
A shadow is a region where light from a light source is obstructed by an opaque object. When a single point source of light is present, the screen behind has a clear dark region. But, when multiple sources are present, a part of the screen is partially dark, and a part of the screen is completely dark. This causes the formation of blurred shadow.
Answer: Option A. ->
True
:
A
:
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 A. ->
luminous body
:
A
:
A
Objects which emit light of their own are called luminous objects. Stars, flashlight, candles etc are examples of luminous objects. Non-luminous objects are visible because they reflect light emitted by luminous objects.
Answer: Option A. ->
By using glass paint
:
A
Cardboard and metal sheets are opaque and attaching them will make the 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 absorption of light, thereby making it translucent.
:
A
Cardboard and metal sheets are opaque and attaching them will make the 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 absorption of light, thereby making it translucent.
Answer: Option B. ->
By using reflective glasses.
:
B
Strong sources of light, like Sun, emit very intense light which can damage our eyes. In order to look at them, the intensity must be reduced to an appropriate level. This could be achieved by using partially reflective, partially transparent media.
Therefore, reflective glasses can be used to protect our eyes while looking at a strong source of light.
:
B
Strong sources of light, like Sun, emit very intense light which can damage our eyes. In order to look at them, the intensity must be reduced to an appropriate level. This could be achieved by using partially reflective, partially transparent media.
Therefore, reflective glasses can be used to protect our eyes while looking at a strong source of light.
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. ->
During evening and morning the angle of elevation from the Sun is low.
:
A
:
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. ->
True
:
A
:
A
Objects which emit light on their own are known as luminous objects. Stars always emit their own light and therefore are luminous objects.
Answer: Option A. ->
inverted
:
A and D
:
A and D
See the image below:
Light travels in a straight line, light from the top of the object after passing through the pinhole will reach the bottom of camera screen and light from the bottom of the object will pass through the pinhole and reach the top of the screen as you can see in the figure. Also, the image is formed on a screen, it is real.
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