What is difference between mass of body and its weight?
– Mass is a measure of the quantity of matter whereas weight is a force.
Why speed of sound is greater in solids than in liquids?
– Because the solids have high elasticity.
How many images will be formed when an object is placed between two mirrors placed parellel to each other?
At which point of earth weight of object will be minimum?
– At the center of earth
When an open bottle of scent is kept at one corner due to which phenomenon its fragrance is found in whole room?
What happens to speed of sound with rise in temperature?
If in a mirror image of object appears to be larger then which type of mirror is used?
– Concave mirror
Why bubble of water shines?
– Due to phenomenon of total internal reflection.
An air bubble in water acts as which lens?
– Concave lens
Why clear nights are more colder then cloudy nights?
– Due to radiation
Why sky appears to be blue?
– Because blue colour of light is of shorter wavelength so easily scattered by dust particles and water vapour.
How water in earthen pots remain cool?
– Because water keeps on passing out from pores and evaporating.
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