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Physics

Physics
The sound produced by a bat is–

Subsonic
Ultrasonic
Infrasonic
Audible

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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 :

0.21111111111111
0.12638888888889
0.20902777777778
0.12777777777778

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Physics
Waves that are required for long distance wireless communication are

Infrared rays
Microwaves
Ultraviolet rays
Radio waves

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Physics
The redness in atmosphere at Sunrise and Sunset is due to :

Refraction of light
Reflection of light
Scattering of light
Dispersion of light

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Physics
Frictional force acts in

The opposite direction of the motion
All the directions
Upward direction
The same direction as the motion

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Physics
When an atom loses an electron it becomes

None of these
Positive ion
Negative ion
Neutron

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