When should we not look at the sun?
  • In the dark
  • At Noon
  • During the Lunar and Solar Eclipse
  • Always
Ruhi observed the shadow of a tree at 8:00 AM, 12:00 noon and 3:00 PM. Which of the following statements is the closest to her observation about the shape and size of the shadow?
  • The shape of the shadow of the tree changes but the size remains the same.
  • The size of the shadow of the tree changes but the shape remains the same.
  • Both the size and shape of the shadow of the tree changes.
  • Neither the shape nor the size of the shadow changes.
Which of the following can never form a circular shadow?
  • A ball
  • A shoe box
  • A Flat disc
  • An Ice cream cone
Two students while sitting across the table look down onto its top surface, they notice they could see their own and each others image. The table top is likely to be made up of?
  • Unpolished wood
  • Red stone
  • Glass sheet.
  • Wood-top covered with cloth
Can you think of creating a shape that will give a circular shadow if held in 1 way, and rectangular shadow if held in another way.
  • Geoid
  • Sphere
  • Rectangle
  • Cylinder
A football match is being played at night in a stadium with lights on you can see the shadow of the football kept at the ground, but cannot see its shadow, when its kicked high in the air. Why?
  • Because it's near the light. And therefore cannot be seen.
  • The shadow of the object cannot be caught if the screen and the object are very far from each other.
  • All of the above
  • None of the object
Rectilinear propagation of light means
  • light bends after striking a smooth surface
  • light travels in a straight line
  • light travels in a curvilinear line
  • both a and b
which of the characteristics is not exhibited by the shadow of an object?
  • erect
  • can be formed on screen
  • same colour as the object
  • can be bigger than the object
which of the following objects can cast a dark shadow?
  • a lighted bulb
  • a wooden door
  • a glass pane
  • both a and b
A plane mirror form an image of an object because it ........ light from the object
  • absorbs
  • reflects
  • passes
  • emits
which of these are required to form the shadow of a ball
  • torch
  • ball
  • screen
  • all of these
which of the following the non-luminous obejct
  • sun
  • moon
  • stars
  • firefly
which of the following is an example of an opaque object
  • clean water
  • plastic wrap
  • cardboard sheet
  • spectacle glass
Image formed in a pinhole camera is
  • erect
  • inverted
  • parallel
  • none of these
Bending of light is called
  • reflection
  • refraction
  • dispersion
  • scattering
If you can see light through an object it is called...
  • opaque
  • plastic
  • transparent
An opaque object means that ...
  • light passes through
  • no light passes through
  • some light passes through
  • you can see through it
Translucent objects let only some light pass thru?
  • False
  • True
We can only see objects because...
  • A light source illuminates the object
  • Our eyes illuminates the objects
  • The objects illuminate themselves
What does the moon do?
  • produces light
  • reflects the suns light
  • produces heat
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