Physics
An oil drop spreads over water because

Oil is more viscous
Oil does not mix with water
Oil is lighter than water
water has a higher surface tension

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion are very large
The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them

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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.
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
Both the photons have different energies.

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