Physics
If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with

Constant speed
Constant acceleration
Constant velocity
Varying acceleration

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

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Physics
Railway tracks are banked on curves so that

Necessary centripetal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels 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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