Physics
The modulus of rigidity is the ratio of

Tensile stress to tensile strain
Shearing stress to shearing strain
Longitudinal stress to longitudinal strain
Volume stress to volume strain

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The floor and carpet are at different temperatures
The carpet is a better conductor of heat than the stone
The stone conveys the heat away from the feet more rapidly than the carpet
The human body maintains a constant temperature

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

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