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Physics

Physics
Radiocarbon dating technique is used to estimate the age of

fossils
rocks
soil
monuments

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5 R/4
R/5
5 R
4 R/5

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Physics
The device which converts sound energy into electrical energy is called

Microphone
Amplifier
Speaker
Transmitter

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Physics
The atmospheric layer reflecting radio waves is called

Mesosphere
Ionosphere
Ozonosphere
Stratosphere

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Physics
Instrument for measuring blueness of the sky or ocean is called ________

Barometer
Bathymeter
Cyanometer
Ceraunograph

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Physics
A body absorbs heat most if it is

Black and rough
White and rough
White and smooth
Black and smooth

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