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Physics

Physics
Which one of the following animals can hear ultrasonic sound ?

Cat
Bat
Squirrel
Rat

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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 :

0.20902777777778
0.21111111111111
0.12777777777778
0.12638888888889

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Physics
A freely suspended magnet remains horizontal at

The magnet equator
The magnetic south pole
The geographic pole
The magnetic north pole

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Physics
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?

Interference
Diffraction
Polarization
Scattering

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Physics
The minimum number of geostationary satellites needed for uninterrupted global coverage is :

2
4
3
1

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Physics
The unit of noise pollution (level) is :

None of these
Decibel
Ppm
Decimal

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