Which process helps the transmission of heat in solids ?
conduction
convention
radiation
isolation
Light can partially pass through
opaque substance
transparent substance
translucent substance
none of these
An example of insulator is
copper
aluminium
iron
wood
The surface of the mirror is
reflective surface
refracted surface
internal reflection
rough surface
An example of artificial light is
sun
stars
glow worms
bulb
The formation of image on mirror is due to
reflection
refraction
total internal reflection
diffraction
How many types of light sources are there?
1
2
3
4
Which of the following helps to make the houses cool?
sand
clay
grass
Wood, coal are the
sources
heat
sources of heat
effects of heat
Transmission of heat is possible only through
cement
glass
