Filament of a torch bulb is
(a) a metal case.
(b) metal tip at the centre of the base.
(c) two thick wires.
(d) a thin wire.
In an electric bulb, light is produced due to the glowing of
(a) the glass case of the bulb.
(b) the thin filament.
(c) the thick wires supporting the filament.
(d) gases inside glass case of the bulb.
Choose the incorrect statement.
(a) A switch is the source of electric current in a circuit.
(b) A switch help to complete or break the circuit.
(c) A switch helps us to use electricity as per our
requirement.
(d) When the switch is open there is an air gap between its
terminals.
A football match is being played at night in a stadium with
flood lights ON. You can see the shadow of a football kept at
the ground but cannot see its shadow when it is kicked high
in the air. Explain.
A football match is being played at night in a stadium with
flood lights ON. You can see the shadow of a football kept at
the ground but cannot see its shadow when it is kicked high
in the air. Explain.
Using a pinhole camera a student observes the image of two of
his friends, standing in sunlight, wearing yellow and red shirt
respectively. What will be the colours of the shirts in the image?
Three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?
A student covered a torch with red cellophane sheet to obtain
red light. Using the red light she obtains a shadow of an opaque
object. She repeats this activity with green and blue light. Will
the colour of the light affect the shadow ? Explain.
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