Q3 of 46 Page 247

The important use of cryogenics is cryogenic fuels. What do you mean by cryogenic fuels?

Cryogenic fuels are liquefied gases which have to be stored at very low temperatures. These are used as fuels in rockets. Ordinary fuels can’t be used there because of the absence of an environment that supports combustion.


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1

Fill in the blanks.

If liquid hydrogen is for rocket, then _________ is for MRI.

 2

Correct the mistakes, if any, in the following statements.

i) One newton is the force that produces an acceleration of 1 ms-2 in an object of 1 gram mass.


ii) Action and reaction always act on the same body.

 4

As a matter of convention, an anticlockwise moment is taken as ________ and a clockwise moment is taken as ________.

 5

A bullet of mass 20 g moving with a speed of 75 ms-1 hits a fixed wooden plank and comes to rest after penetrating a distance of 5 cm. What is the average resistive force exerted by the wooden plank on the bullet?