Physics-
General
Easy
Question
If the velocity of a body increases as time passes the body is ...
- retarded
- accelerated
- decelerated
- both 1 & 3
The correct answer is: accelerated
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A source of sound is moving towards a platform with a velocity of 100ms–1 If the frequency of sound produced is 200 Hz, find the apparent frequency of the sound observed by an observer standing on the platform velocity of sound = 320m/s).
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The velocity of sound in air at 20
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An aeroplane is going towards east at a speed of 510 kmph at a height of 2000m. At a certain instant, the sound of the plane heard by a ground observer appears to come from a point vertically above him. Where is the aeroplane at this instant ?speed of sound in air = 
)
An aeroplane is going towards east at a speed of 510 kmph at a height of 2000m. At a certain instant, the sound of the plane heard by a ground observer appears to come from a point vertically above him. Where is the aeroplane at this instant ?speed of sound in air = )
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Two liquids A and B are at 30°C and 20°C respectively. When they are mixed in equal masses the temperature of the mixture was found to be 26°C The ratio of their specific heats is..
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400 cal of heat is utilised to melt ice into H2O at the same temperature. The mass of ice melted is
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The volume of iron which will have the same thermal capacity as 1200 cc of water is Specific heat of iron = 
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A block of aluminium of mass 2kg was supplied with 3600J of heat If the specific heat of aluminium is 900 
, then rise in temperature is.
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