Light, Shadow and Reflection (Class VI)
Light shadows and reflection
Questions
Why is there some light on Earth even on a dark, cloudy day?
- Clouds are transparent.
- Clouds are opaque.
- Clouds are translucent.
- Clouds are luminous.
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Non-luminous objects are visible because they ______________________.
- reflect light into our eyes
- pass light through them
- reflect light in one direction
- do not reflect light
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What is meant by 'rectilinear propagation of light'?
- Light travels in a curved line.
- Light can bend around the corners.
- Light travels in a straight line.
- Light passes through opaque objects.
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Which of the following is not true?
- Pinhole is small in pinhole camera.
- Image in pinhole camera is the same colour as the object.
- Image in pinhole camera is virtual.
- Pinhole camera is used for real time viewing.
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(a) Real (b) Virtual (c) Inverted (d) Magnified
What is the nature of the image formed by a pinhole camera?
- Both b and c
- Both a and c
- Both b and d
- Both a and d
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(a) Sun, candle (b) Candle, stars (c) Stars, firefly (d) Sun, torch
Identify the pair with natural sources of light.
- (b)
- (c)
- (a)
- (d)
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Match the following
| (a) Erect | (i) Image cannot be obtained on screen. |
| (b) Real | (ii) Image is upside down. |
| (c) Virtual | (iii) Image can be obtained on a screen. |
| (d) Inverted | (iv) Image is same side up. |
- (a) - (iv), (b) - (ii), (c) - (i), (d) - (iii)
- (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
- (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
- (a) - (i), (b) - (iii), (c) - (iv), (d) - (ii)
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What type of image does a plane mirror form?
- Inverted image
- Virtual image
- Real image
- Magnified image
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Match the following
| Objects |
</strong>|<strong>Property
</strong>|<strong>Examles</strong>|
|(a) Translucent|(i) Allows all light to pass through it|(x) Frosted glass|
|(b) Opaque|(ii) Allows some light to pass through it|(y) Glass|
|(c) Transparent|(iii) Allows no light to pass through it|(z) Steel glass|
- (a) - (iii) - (z); (b) - (ii) - (y); (c) - (i) - (x)
- (a) - (i) - (y); (b) - (iii) - (z); (c) - (ii) - (x)
- (a) - (ii) - (x); (b) - (i) - (y); (c) - (iii) - (z)
- (a) - (ii) - (x); (b) - (iii) - (z); (c) - (i) - (y)
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Which of the following characteristics is not exhibited by the shadow of an object?
- Can be formed on screen.
- Same colour as the object.
- It is erect.
- It can be bigger than the object.
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Light hitting the mirror is called ___________ and light leaving the mirror is called __________.
- reflected ray, incident ray
- reflected ray, refracted ray
- incident ray, refracted ray
- incident ray, reflected ray
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The shadow of an object is ____________ in the noon and ___________ in the evening.
- longest, shortest
- diminished, longest
- shortest, diminished
- shortest, longest
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a. Plane glass window pane
b. Butter paper
c. Aluminium sheet
d. Ground glass
Which of the above are translucent materials?
- b and d
- a and d
- a and c
- b and c
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A soldier sitting in a trench will use which of the following devices to observe enemy activities above the ground?
- Telescope
- Microscope
- Stethoscope
- Periscope
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What type of screen is used in a pinhole camera?
- Opaque
- Translucent
- Transparent
- Plane mirror
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a. Plane mirror
b. Piece of paper
c. Leather bag
d. Still water
Which of the above will produce diffused reflection of light?
- b and c
- a and d
- a and c
- b and d
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In which of the following is a virtual image formed?
- Pinhole camera
- Cinema screen
- Plane mirror
- Camera
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If an object is white, what will be the colour of the shadow?
- White
- Brown
- Black
- Blue
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a. Plane mirrors are used in houses to view ourselves.
b. Plane mirrors are used to make periscope.
c. Plane mirrors are used in shaving.
d. Plane mirrors are used in solar cookers.
Which of the above is/are not true?
- c
- d
- a
- b
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a. The image formed in a plane mirror is real.
b. The image formed in a plane mirror is virtual.
c. The image formed in a plane mirror is laterally inverted.
d. The image formed in a plane mirror is not laterally inverted.
Which of the above is/are not true?
- a and c
- a and d
- b and d
- b and c
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