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Physics

Physics
The unit of force is a

Fundamental Unit
Derived Unit
None of these
Basic Unit

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Physics
Choose the most appropriate answer: In which atmospheric layer are the communication satellites located?

Stratosphere
Mesosphere
Troposphere
Ionosphere

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Physics
Bats can sense obstacles because they produce

Infrasonic sound waves
Supersonic sound waves
Micro sound waves
Ultrasonic sound waves

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Physics
The phenomenon of light associated with the appearance of blue colour of the sky is

Refraction
Scattering
Interference
Reflection

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Physics
In spherical polar coordinates (l, q, a), q denotes the polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by

Psinq cosa
Pcosq cosa
Pcosq sina
Psinq sina

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Physics
A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of ________ .

Gravitational force between train and man
Pressure difference due to fast moving air in between
The centripetal force
Illusion of the man

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