General science
What is difference between mass of body and its weight?
– Mass is a measure of the quantity of matter whereas weight is a force.
– 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.
– 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?
– Infinite
– Infinite
At which point of earth weight of object will be minimum?
– At the center of earth
– 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?
– Diffusion
– Diffusion
What happens to speed of sound with rise in temperature?
– Increases
– Increases
If in a mirror image of object appears to be larger then which type of mirror is used?
– Concave mirror
– Concave mirror
Why bubble of water shines?
– Due to phenomenon of total internal reflection.
– Due to phenomenon of total internal reflection.
An air bubble in water acts as which lens?
– Concave lens
– Concave lens
Why clear nights are more colder then cloudy nights?
– Due to radiation
– 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.
– 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.
– Because water keeps on passing out from pores and evaporating.
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