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Physics

Physics
Sound following a flash of lightning is called

Stoning
Cloud clash
Bolting
Thunder

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Physics
As water is cooled from 4 deg C to 0 deg C, its density

Increases
None of these
Remains same
Decreases

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Physics
Rolling friction is caused by ________

Power dissipation
Non-elastic effects
Gravity
Buoyancy

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Physics
The atmospheric layer reflecting radio waves is called

Mesosphere
Ozonosphere
Ionosphere
Stratosphere

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Physics
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

0.12638888888889
0.20902777777778
0.21111111111111
0.12777777777778

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Physics
In hydro power station, the motion produced in turbines is due to

Flow of water
Burning of coal
Production of steam
Burning of diesel

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