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Mechanical Properties of Fluids
Question
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What do you mean by blue shift?

Answer

When the source moves towards the observer, the spectral lines received by an observer from the source are observed to shift towards the shorter wavelength. That is, towards the blue part of the spectrum due to Doppler effect.
This process is called blue shift. 

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Some More Questions From Mechanical Properties of Fluids Chapter

Is it logical to say that wave motion is a process of propagation of mass?

What is common property of all types of waves?

What are different types of wave motions?

Define transverse wave motion.

Define longitudinal wave motion.

Which of the two waves - elastic waves or electromagnetic waves does need any material media for its propagation?

What is sound?

How sound is produced?

Can sound travel in vacuum?

Can two persons hear each other on the moon? Explain.