Physics
Even after sunset, the air near the Earth's surface continue to receive heat due to

Terrestrial Radiation
Convection
Insolation
Conduction

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Physics
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?

The frequency of X-ray photon is higher than the frequency of visible radiation photon.
Both the photons have different energies.
The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
The speeds of both the photons in vacuum are different

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Physics
Railway tracks are banked on curves so that

No frictional force may be produced between the tracks and the wheels of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards

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