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Physics

Physics
Mach number is used in connection with the speed of

ships
sound
spacecraft
aircraft

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Physics
A pilot has to release the bomb to hit a target

Before the target
Beyond the target
None of these
Right above the target

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Physics
Choose the most appropriate answer: Sir CV Raman was awarded Noble Prize for his work connected with which of the following phenomenon of radiation?

Diffraction
Polarization
Scattering
Interference

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Physics
Water is used in car radiator because of its

Low boiling point
Low density
Easy availability
High specific heat capacity

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Physics
A spherical ball made of steel when dropped in mercury container

Sink in mercury
Will dissolve in mercury
Will be partly immersed mercury
Will be on the surface of mercury

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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
0.21111111111111
0.20902777777778
0.12777777777778

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