Physics
A thin oil film on a water surface appears coloured because of

Interference
Diffraction
Reflection
Polarization

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
It produces corrosion
Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Presence of gravity outside but not inside the spacecraft
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy
Absence of gravity outside

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