6th Grade > Physics
LIGHT SHADOWS AND REFLECTION MCQs
Total Questions : 97
| Page 5 of 10 pages
Question 41. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, smoke, a sheet of plain glass, fog, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, Sun, firefly, moon. [5 MARKS]
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, smoke, a sheet of plain glass, fog, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, Sun, firefly, moon. [5 MARKS]
:
Each Point: 1 Mark
Opaque: a piece of rock, a sheet of aluminum, a mirror, a wooden board, a CD, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard.
Transparent: Air, water,a sheet of plane glass, a sheet of cellophane.
Translucent: smoke, fog,a wire mesh.
Luminous: a piece of red-hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, kerosene stove, Sun, firefly.
Non-luminous: Air, water, a piece of rock, a sheet of aluminum, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, moon.
Answer: Option A. -> True
:
A
Objects which emit light on their own are known as luminous objects. Stars always emit their own light and therefore are luminous objects.
:
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. -> luminous
:
A
Objects which emit light on their own are known as luminous objects. For example, candle, gas flame etcemit light of their own. So any kind of flame is luminous.
:
A
Objects which emit light on their own are known as luminous objects. For example, candle, gas flame etcemit light of their own. So any kind of flame is luminous.
Answer: Option C. -> Sun is spherical in shape.
:
C
Pinhole camera always forms inverted image only. The reason we don'tsee the image of the sun inverted is that the image is very small and it is highly symmetrical (the sun itself is spherical and symmetric). So, being inverted or not it appears to be the same.
:
C
Pinhole camera always forms inverted image only. The reason we don'tsee the image of the sun inverted is that the image is very small and it is highly symmetrical (the sun itself is spherical and symmetric). So, being inverted or not it appears to be the same.
Answer: Option C. -> Firefly
:
C
Bioluminescenceis the production and emission of light by a living organism. Among the given options, only stars and firefliesemit their own light butstars are not living objects andbutterfliesand bees do not emitlight. So firefly is an example of bioluminescence.
:
C
Bioluminescenceis the production and emission of light by a living organism. Among the given options, only stars and firefliesemit their own light butstars are not living objects andbutterfliesand bees do not emitlight. So firefly is an example of bioluminescence.
Answer: Option B. -> It depends on the orientation of light source and the size of the object.
:
B
The shape of a shadow depends on the shape of the object and on the orientation of the source of light with respect to the object. For example, the shadow of a cube can be rhombus, square or rectangle depending on the orientation of source of light. In addition, the size will depend upon the distance between the object and the source of light.
:
B
The shape of a shadow depends on the shape of the object and on the orientation of the source of light with respect to the object. For example, the shadow of a cube can be rhombus, square or rectangle depending on the orientation of source of light. In addition, the size will depend upon the distance between the object and the source of light.
Answer: Option D. ->
Sun
:
D
:
D
Luminous objects emit their own light. This light may come to our eyes directly or through reflection by non-luminous objects enabling us to see. Examples of luminous objects are stars, flashlight etc.
Answer: Option C. ->
Glass sheet
:
C
A material which allows light to completely pass through it is called as transparent material. One can easily see objects on the other side of a transparent object. Out of the given options, glass is the only transparent material. So, Chintu would be holding a glass sheet.
:
C
A material which allows light to completely pass through it is called as transparent material. One can easily see objects on the other side of a transparent object. Out of the given options, glass is the only transparent material. So, Chintu would be holding a glass sheet.
Answer: Option C. ->
Shadow is formed when an opaque object comes in the path of light.
:
C
A shadow is formed when light is blocked by an opaque or translucent object. Opaque objects, such as a tree, completely block light and form a dark shadow. Transparent objects, such as glass, do not create a shadow because the light completely passes through them.
:
C
A shadow is formed when light is blocked by an opaque or translucent object. Opaque objects, such as a tree, completely block light and form a dark shadow. Transparent objects, such as glass, do not create a shadow because the light completely passes through them.
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