Light shadows and reflection

Which of the following options are sources of Artificial light?

• Sun

• Firefly

• Electric bulb

• Stars

• Glowworm

Answer explanation

Electric bulb is a source of Artificial light.

The propagation of light in a straight line is known as ___________propagation of light.

Answer explanation

The propagation of light in a straight line is known as rectilinear propagation of light.

Light is Made of _____ Colours  

Answer explanation

In which of the following situations will a shadow form?

• A torch is shining on the wall

• A torch is shining on the ball which is pointed at the sky

• A ball is sitting in front of a wall

• A torch is shining light on the wall which is being obstructed by the ball

During ______________, the green plants prepare food using the energy of sunlight.

• photosynthesis

• transpiration

• fertilisation

• none of these

light spreads in all directions from its source, unless___.

Answer explanation

light spreads in all directions from its source, unless it is restricted by some barrier.​

Light travels in a straight line as thin beams of light called ____.

A shadow is always black, whatever be the color of the object. Is this statement True or False?

• True

• False

• Depends

• Cannot determine

When the distance between the source of light and the object is more, the size of the shadow is larger. Is this statement True or False?

a) The rays falling on any surface are called _____ rays.

b) The point at which an incident ray falls is called the point of _____.

• a)- Incident

  b)- Reflection

• a)- incidence

  b)- incident

• a)- incident

  b)- incidence

• a)- incident

  b)- incident